/* ========================================
   Leap Code — Платформа AI-образования
   Design System - Бирюзовый неон + 3D
   ======================================== */

/* ========================================
   1. Шрифты (Google Fonts)
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Syne:wght@700;800&display=swap');

/* ========================================
   2. CSS Переменные (Design Tokens)
   ======================================== */

/* === ЗЕЛЁНАЯ ТЕМА (по умолчанию) === */
:root {
    /* Шрифты */
    --font-heading: 'Syne', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Цвета бренда - зелёные */
    --emerald-dark: #064e3b;
    --emerald: #10b981;
    --emerald-light: #34d399;
    --turquoise: #14b8a6;
    --turquoise-light: #2dd4bf;
    --turquoise-glow: rgba(20, 184, 166, 0.5);
    --mint: #ccfbf1;
    --mint-light: #f0fdfa;

    --primary-gradient: linear-gradient(135deg, #14b8a6 0%, #10b981 100%);
    --primary-gradient-light: linear-gradient(135deg, #2dd4bf 0%, #14b8a6 100%);
    --primary-gradient-dark: linear-gradient(135deg, #064e3b 0%, #047857 100%);
    --primary-glow: radial-gradient(circle, rgba(20, 184, 166, 0.4) 0%, transparent 70%);

    --primary-50: #f0fdfa;
    --primary-100: #ccfbf1;
    --primary-200: #99f6e4;
    --primary-300: #5eead4;
    --primary-400: #2dd4bf;
    --primary-500: #14b8a6;
    --primary-600: #0d9488;
    --primary-700: #0f766e;
    --primary-800: #115e59;
    --primary-900: #134e4a;

    /* Нейтральные цвета */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Семантические цвета */
    --success: #10b981;
    --success-bg: #d1fae5;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --error: #ef4444;
    --error-bg: #fee2e2;
    --info: #06b6d4;
    --info-bg: #ecfeff;

    /* Размеры и отступы */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-2xl: 48px;
    --radius-full: 9999px;

    /* Тени - многослойные */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(20, 184, 166, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(20, 184, 166, 0.5);

    /* Переходы */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* === КРАСНАЯ ТЕМА === */
[data-theme="red"] {
    --emerald-dark: #7f1d1d;
    --emerald: #dc2626;
    --emerald-light: #f87171;
    --turquoise: #dc2626;
    --turquoise-light: #f87171;
    --turquoise-glow: rgba(220, 38, 38, 0.5);
    --mint: #fee2e2;
    --mint-light: #fef2f2;

    --primary-gradient: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
    --primary-gradient-light: linear-gradient(135deg, #f87171 0%, #dc2626 100%);
    --primary-gradient-dark: linear-gradient(135deg, #7f1d1d 0%, #450a0a 100%);
    --primary-glow: radial-gradient(circle, rgba(220, 38, 38, 0.4) 0%, transparent 70%);

    --primary-50: #fef2f2;
    --primary-100: #fee2e2;
    --primary-200: #fecaca;
    --primary-300: #fca5a5;
    --primary-400: #f87171;
    --primary-500: #dc2626;
    --primary-600: #b91c1c;
    --primary-700: #991b1b;
    --primary-800: #7f1d1d;
    --primary-900: #450a0a;

    --shadow-glow: 0 0 40px rgba(220, 38, 38, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(220, 38, 38, 0.5);
}

/* === ОРАНЖЕВАЯ ТЕМА === */
[data-theme="orange"] {
    --emerald-dark: #7c2d12;
    --emerald: #ea580c;
    --emerald-light: #fb923c;
    --turquoise: #ea580c;
    --turquoise-light: #fb923c;
    --turquoise-glow: rgba(234, 88, 12, 0.5);
    --mint: #ffedd5;
    --mint-light: #fff7ed;

    --primary-gradient: linear-gradient(135deg, #ea580c 0%, #c2410c 100%);
    --primary-gradient-light: linear-gradient(135deg, #fb923c 0%, #ea580c 100%);
    --primary-gradient-dark: linear-gradient(135deg, #7c2d12 0%, #431407 100%);
    --primary-glow: radial-gradient(circle, rgba(234, 88, 12, 0.4) 0%, transparent 70%);

    --primary-50: #fff7ed;
    --primary-100: #ffedd5;
    --primary-200: #fed7aa;
    --primary-300: #fdba74;
    --primary-400: #fb923c;
    --primary-500: #ea580c;
    --primary-600: #c2410c;
    --primary-700: #9a3412;
    --primary-800: #7c2d12;
    --primary-900: #431407;

    --shadow-glow: 0 0 40px rgba(234, 88, 12, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(234, 88, 12, 0.5);
}

/* === ГОЛУБАЯ ТЕМА === */
[data-theme="blue"] {
    --emerald-dark: #0c4a6e;
    --emerald: #0284c7;
    --emerald-light: #38bdf8;
    --turquoise: #0284c7;
    --turquoise-light: #38bdf8;
    --turquoise-glow: rgba(2, 132, 199, 0.5);
    --mint: #e0f2fe;
    --mint-light: #f0f9ff;

    --primary-gradient: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    --primary-gradient-light: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
    --primary-gradient-dark: linear-gradient(135deg, #0c4a6e 0%, #082f49 100%);
    --primary-glow: radial-gradient(circle, rgba(2, 132, 199, 0.4) 0%, transparent 70%);

    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;

    --shadow-glow: 0 0 40px rgba(2, 132, 199, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(2, 132, 199, 0.5);
}

/* === ФИОЛЕТОВАЯ ТЕМА === */
[data-theme="purple"] {
    --emerald-dark: #581c87;
    --emerald: #9333ea;
    --emerald-light: #c084fc;
    --turquoise: #9333ea;
    --turquoise-light: #c084fc;
    --turquoise-glow: rgba(147, 51, 234, 0.5);
    --mint: #f3e8ff;
    --mint-light: #faf5ff;

    --primary-gradient: linear-gradient(135deg, #9333ea 0%, #7e22ce 100%);
    --primary-gradient-light: linear-gradient(135deg, #c084fc 0%, #9333ea 100%);
    --primary-gradient-dark: linear-gradient(135deg, #581c87 0%, #3b0764 100%);
    --primary-glow: radial-gradient(circle, rgba(147, 51, 234, 0.4) 0%, transparent 70%);

    --primary-50: #faf5ff;
    --primary-100: #f3e8ff;
    --primary-200: #e9d5ff;
    --primary-300: #d8b4fe;
    --primary-400: #c084fc;
    --primary-500: #a855f7;
    --primary-600: #9333ea;
    --primary-700: #7e22ce;
    --primary-800: #6b21a8;
    --primary-900: #581c87;

    --shadow-glow: 0 0 40px rgba(147, 51, 234, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(147, 51, 234, 0.5);
}

/* === ЖЁЛТАЯ ТЕМА === */
[data-theme="yellow"] {
    --emerald-dark: #854d0e;
    --emerald: #ca8a04;
    --emerald-light: #facc15;
    --turquoise: #ca8a04;
    --turquoise-light: #facc15;
    --turquoise-glow: rgba(202, 138, 4, 0.5);
    --mint: #fef9c3;
    --mint-light: #fefce8;

    --primary-gradient: linear-gradient(135deg, #ca8a04 0%, #a16207 100%);
    --primary-gradient-light: linear-gradient(135deg, #facc15 0%, #ca8a04 100%);
    --primary-gradient-dark: linear-gradient(135deg, #854d0e 0%, #713f12 100%);
    --primary-glow: radial-gradient(circle, rgba(202, 138, 4, 0.4) 0%, transparent 70%);

    --primary-50: #fefce8;
    --primary-100: #fef9c3;
    --primary-200: #fef08a;
    --primary-300: #fde047;
    --primary-400: #facc15;
    --primary-500: #eab308;
    --primary-600: #ca8a04;
    --primary-700: #a16207;
    --primary-800: #854d0e;
    --primary-900: #713f12;

    --shadow-glow: 0 0 40px rgba(202, 138, 4, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(202, 138, 4, 0.5);
}

/* === СИНЯЯ ТЕМА === */
[data-theme="indigo"] {
    --emerald-dark: #312e81;
    --emerald: #4f46e5;
    --emerald-light: #818cf8;
    --turquoise: #4f46e5;
    --turquoise-light: #818cf8;
    --turquoise-glow: rgba(79, 70, 229, 0.5);
    --mint: #e0e7ff;
    --mint-light: #eff6ff;

    --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    --primary-gradient-light: linear-gradient(135deg, #818cf8 0%, #4f46e5 100%);
    --primary-gradient-dark: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%);
    --primary-glow: radial-gradient(circle, rgba(79, 70, 229, 0.4) 0%, transparent 70%);

    --primary-50: #eff6ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;

    --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(79, 70, 229, 0.5);
}

/* ========================================
   3. Кастомный скроллбар
   ======================================== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--mint-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--turquoise-light), var(--turquoise));
    border-radius: var(--radius-full);
    border: 2px solid var(--mint-light);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--turquoise), var(--emerald));
}

/* ========================================
   4. Базовые стили (Reset & Base)
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: 
        radial-gradient(ellipse at top, var(--mint-light) 0%, var(--white) 50%),
        radial-gradient(ellipse at bottom right, rgba(20, 184, 166, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at bottom left, rgba(16, 185, 129, 0.05) 0%, transparent 50%);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Декоративные фоновые элементы */
body::before {
    content: '';
    position: fixed;
    top: -10%;
    right: -5%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    pointer-events: none;
    z-index: -1;
    animation: floatBg 15s ease-in-out infinite;
}

body::after {
    content: '';
    position: fixed;
    bottom: -10%;
    left: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    pointer-events: none;
    z-index: -1;
    animation: floatBg 12s ease-in-out infinite reverse;
}

@keyframes floatBg {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

/* Звезды на фоне */
.bg-stars {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.bg-star {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--turquoise);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--turquoise), 0 0 20px var(--turquoise-light);
    animation: twinkle 3s ease-in-out infinite;
}

.bg-star:nth-child(1) { top: 10%; left: 15%; animation-delay: 0s; }
.bg-star:nth-child(2) { top: 20%; left: 75%; animation-delay: 0.5s; }
.bg-star:nth-child(3) { top: 35%; left: 85%; animation-delay: 1s; }
.bg-star:nth-child(4) { top: 45%; left: 25%; animation-delay: 1.5s; }
.bg-star:nth-child(5) { top: 60%; left: 65%; animation-delay: 2s; }
.bg-star:nth-child(6) { top: 75%; left: 35%; animation-delay: 2.5s; }
.bg-star:nth-child(7) { top: 85%; left: 80%; animation-delay: 0.3s; }
.bg-star:nth-child(8) { top: 15%; left: 50%; animation-delay: 0.8s; }
.bg-star:nth-child(9) { top: 50%; left: 95%; animation-delay: 1.3s; }
.bg-star:nth-child(10) { top: 90%; left: 10%; animation-delay: 1.8s; }

@keyframes twinkle {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* Четырехконечные звезды */
.bg-star-four {
    position: fixed;
    width: 30px;
    height: 30px;
    pointer-events: none;
    z-index: -1;
    animation: starFloat 6s ease-in-out infinite;
}

.bg-star-four svg {
    width: 100%;
    height: 100%;
    fill: var(--emerald-dark);
    opacity: 0.6;
}

.bg-star-four-1 {
    top: 20%;
    right: 10%;
    animation-delay: 0s;
}

.bg-star-four-2 {
    bottom: 30%;
    left: 8%;
    animation-delay: 2s;
}

.bg-star-four-3 {
    top: 60%;
    right: 20%;
    animation-delay: 4s;
}

@keyframes starFloat {
    0%, 100% { transform: translateY(0) rotate(0deg) scale(1); }
    50% { transform: translateY(-20px) rotate(180deg) scale(1.1); }
}

/* Градиентные круги */
.bg-circle {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
    filter: blur(40px);
    opacity: 0.5;
}

.bg-circle-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(45, 212, 191, 0.15) 0%, transparent 70%);
    top: 30%;
    left: 20%;
    animation: pulseCircle 10s ease-in-out infinite;
}

.bg-circle-2 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, transparent 70%);
    bottom: 20%;
    right: 15%;
    animation: pulseCircle 8s ease-in-out infinite reverse;
}

.bg-circle-3 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: pulseCircle 12s ease-in-out infinite;
}

@keyframes pulseCircle {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 0.3; }
}

/* Линии сетки */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(20, 184, 166, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(20, 184, 166, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: -1;
}

/* Плавающие иконки программирования */
.bg-code-icons {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.bg-code-icon {
    position: absolute;
    font-size: 2rem;
    color: var(--turquoise);
    opacity: 0.1;
    animation: codeIconFloat 20s ease-in-out infinite;
    filter: drop-shadow(0 0 10px rgba(20, 184, 166, 0.3));
}

.bg-code-icon:nth-child(1) { top: 15%; left: 10%; animation-delay: 0s; font-size: 3rem; }
.bg-code-icon:nth-child(2) { top: 25%; left: 85%; animation-delay: 3s; font-size: 2.5rem; }
.bg-code-icon:nth-child(3) { top: 40%; left: 90%; animation-delay: 6s; font-size: 2rem; }
.bg-code-icon:nth-child(4) { top: 55%; left: 15%; animation-delay: 9s; font-size: 2.8rem; }
.bg-code-icon:nth-child(5) { top: 70%; left: 80%; animation-delay: 12s; font-size: 2.2rem; }
.bg-code-icon:nth-child(6) { top: 85%; left: 20%; animation-delay: 15s; font-size: 3.2rem; }
.bg-code-icon:nth-child(7) { top: 10%; left: 50%; animation-delay: 5s; font-size: 1.8rem; }
.bg-code-icon:nth-child(8) { top: 95%; left: 60%; animation-delay: 8s; font-size: 2.4rem; }

@keyframes codeIconFloat {
    0%, 100% { 
        transform: translateY(0) rotate(0deg) scale(1); 
        opacity: 0.1;
    }
    25% { 
        transform: translateY(-30px) rotate(90deg) scale(1.1); 
        opacity: 0.15;
    }
    50% { 
        transform: translateY(-15px) rotate(180deg) scale(0.9); 
        opacity: 0.08;
    }
    75% { 
        transform: translateY(-40px) rotate(270deg) scale(1.05); 
        opacity: 0.12;
    }
}

/* Бинарный код на фоне */
.bg-binary {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    color: var(--turquoise);
    opacity: 0.05;
    user-select: none;
}

.bg-binary-column {
    position: absolute;
    top: -100px;
    writing-mode: vertical-rl;
    animation: binaryFall 15s linear infinite;
}

.bg-binary-column:nth-child(1) { left: 5%; animation-delay: 0s; animation-duration: 18s; }
.bg-binary-column:nth-child(2) { left: 15%; animation-delay: 2s; animation-duration: 20s; }
.bg-binary-column:nth-child(3) { left: 25%; animation-delay: 4s; animation-duration: 16s; }
.bg-binary-column:nth-child(4) { left: 35%; animation-delay: 1s; animation-duration: 22s; }
.bg-binary-column:nth-child(5) { left: 45%; animation-delay: 3s; animation-duration: 19s; }
.bg-binary-column:nth-child(6) { left: 55%; animation-delay: 5s; animation-duration: 17s; }
.bg-binary-column:nth-child(7) { left: 65%; animation-delay: 2.5s; animation-duration: 21s; }
.bg-binary-column:nth-child(8) { left: 75%; animation-delay: 4.5s; animation-duration: 18s; }
.bg-binary-column:nth-child(9) { left: 85%; animation-delay: 1.5s; animation-duration: 20s; }
.bg-binary-column:nth-child(10) { left: 95%; animation-delay: 3.5s; animation-duration: 16s; }

@keyframes binaryFall {
    0% { transform: translateY(-100px); }
    100% { transform: translateY(2000px); }
}

/* Плавающие скобки кода */
.bg-brackets {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
}

.bg-bracket {
    position: absolute;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 4rem;
    font-weight: 700;
    color: var(--primary-400);
    opacity: 0.08;
    animation: bracketFloat 25s ease-in-out infinite;
}

.bg-bracket-1 {
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.bg-bracket-2 {
    top: 60%;
    right: 10%;
    animation-delay: 5s;
}

.bg-bracket-3 {
    bottom: 20%;
    left: 15%;
    animation-delay: 10s;
    transform: rotate(90deg);
}

@keyframes bracketFloat {
    0%, 100% { 
        transform: translateY(0) rotate(0deg) scale(1); 
        opacity: 0.08;
    }
    50% { 
        transform: translateY(-50px) rotate(180deg) scale(1.2); 
        opacity: 0.15;
    }
}

/* Частицы кода */
.bg-code-particles {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
}

.bg-particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--primary-gradient);
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(20, 184, 166, 0.5);
    animation: particleFloat 30s linear infinite;
}

.bg-particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 25s; }
.bg-particle:nth-child(2) { left: 20%; animation-delay: 5s; animation-duration: 30s; }
.bg-particle:nth-child(3) { left: 30%; animation-delay: 10s; animation-duration: 28s; }
.bg-particle:nth-child(4) { left: 40%; animation-delay: 15s; animation-duration: 32s; }
.bg-particle:nth-child(5) { left: 50%; animation-delay: 20s; animation-duration: 27s; }
.bg-particle:nth-child(6) { left: 60%; animation-delay: 8s; animation-duration: 29s; }
.bg-particle:nth-child(7) { left: 70%; animation-delay: 12s; animation-duration: 31s; }
.bg-particle:nth-child(8) { left: 80%; animation-delay: 18s; animation-duration: 26s; }
.bg-particle:nth-child(9) { left: 90%; animation-delay: 22s; animation-duration: 33s; }
.bg-particle:nth-child(10) { left: 95%; animation-delay: 25s; animation-duration: 28s; }

@keyframes particleFloat {
    0% {
        top: 100%;
        opacity: 0;
        transform: scale(0);
    }
    10% {
        opacity: 1;
        transform: scale(1);
    }
    90% {
        opacity: 1;
        transform: scale(1);
    }
    100% {
        top: -100px;
        opacity: 0;
        transform: scale(0.5);
    }
}

/* ========================================
   4. Типографика (Detalized)
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 800;
    line-height: 1.2;
    color: var(--gray-900);
    letter-spacing: -0.02em;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
    margin-bottom: 1rem;
    color: var(--gray-600);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

a:hover {
    color: var(--primary-700);
}

/* ========================================
   5. Утилиты
   ======================================== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-gradient-lime {
    background: var(--primary-gradient-light);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-center { text-align: center; }
.text-muted { color: var(--gray-500); }

.text-glow {
    text-shadow: 0 0 20px rgba(132, 204, 22, 0.4);
}

/* ========================================
   6. Кнопки (Turquoise Detailed)
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md), 0 4px 15px rgba(20, 184, 166, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 12px 30px rgba(20, 184, 166, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border-color: var(--gray-300);
    box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--mint-light), white);
    border-color: var(--primary-300);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(20, 184, 166, 0.15);
    transform: translateY(-2px);
    color: var(--turquoise);
}

.btn-lg {
    padding: 18px 36px;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 10px 18px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

.btn-glow {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
    border: none;
    position: relative;
}

.btn-glow::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.4), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.btn-glow:hover {
    box-shadow: var(--shadow-glow-lg), 0 0 80px rgba(20, 184, 166, 0.5);
    transform: translateY(-3px) scale(1.02);
}

.btn-outline-primary {
    background: transparent;
    color: var(--turquoise);
    border: 2px solid var(--primary-400);
    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.5);
}

.btn-outline-primary:hover {
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-color: var(--primary-500);
    color: var(--emerald-dark);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(20, 184, 166, 0.2);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: white;
    color: var(--gray-700);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* ========================================
   7. Формы (Detailed)
   ======================================== */
.form-control,
.form-select {
    display: block;
    width: 100%;
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-800);
    background: linear-gradient(180deg, white, #fafbfb);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.form-control:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px var(--primary-100), 0 4px 12px rgba(132, 204, 22, 0.15);
    background: white;
}

.form-control::placeholder {
    color: var(--gray-400);
}

.form-control-lg {
    padding: 16px 20px;
    font-size: 1.125rem;
}

.form-label {
    display: block;
    margin-bottom: 10px;
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--gray-700);
    position: relative;
    padding-left: 12px;
}

.form-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background: var(--primary-500);
    border-radius: 50%;
}

.form-text {
    display: block;
    margin-top: 8px;
    font-size: 0.875rem;
    color: var(--gray-500);
    padding-left: 12px;
    border-left: 2px solid var(--primary-200);
}

.form-check {
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-check-input {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-600);
    border-radius: var(--radius-sm);
}

.form-check-label {
    font-weight: 500;
    color: var(--gray-700);
    cursor: pointer;
}

/* ========================================
   8. Карточки (Detailed)
   ======================================== */
.card {
    background: white;
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md), 0 0 0 1px rgba(20, 184, 166, 0.05);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-300), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

/* Убрал hover-эффекты для карточек - оставляем только для кнопок */
.card {
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 20px 24px;
    background: linear-gradient(180deg, white, var(--gray-50));
    border-bottom: 1px solid var(--gray-100);
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--gray-900);
    position: relative;
}

.card-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 24px;
    right: 24px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-300), var(--primary-400), transparent);
    border-radius: var(--radius-full);
}

.card-body {
    padding: 24px;
    position: relative;
}

.card-footer {
    padding: 16px 24px;
    background: linear-gradient(180deg, var(--gray-50), white);
    border-top: 1px solid var(--gray-100);
    position: relative;
}

.card-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 24px;
    right: 24px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-200), transparent);
}

/* Карточки с градиентным бордером */
.card-gradient-border {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
}

.card-gradient-border::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 2px;
    background: var(--primary-gradient);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* Карточка с уголками */
.card-corner-accent {
    position: relative;
}

.card-corner-accent::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--primary-400), transparent);
    border-radius: 0 0 var(--radius-lg) 0;
}

.card-corner-accent::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, transparent, var(--primary-400));
    border-radius: var(--radius-lg) 0 0 0;
}

/* ========================================
   9. Alerts
   ======================================== */
.alert {
    padding: 16px 20px;
    margin-bottom: 16px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    border-left: 4px solid;
}

.alert-dismissible {
    padding-right: 48px;
    position: relative;
}

.alert-dismissible .btn-close {
    position: absolute;
    top: 50%;
    right: 16px;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.alert-dismissible .btn-close:hover {
    opacity: 1;
}

.alert-success {
    background: var(--success-bg);
    border-color: var(--success);
    color: #166534;
}

.alert-warning {
    background: var(--warning-bg);
    border-color: var(--warning);
    color: #92400e;
}

.alert-danger,
.alert-error {
    background: var(--error-bg);
    border-color: var(--error);
    color: #991b1b;
}

.alert-info {
    background: var(--info-bg);
    border-color: var(--info);
    color: #1e40af;
}

/* ========================================
   10. Бейджи
   ======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: var(--primary-100);
    color: var(--primary-700);
}

.badge-success {
    background: var(--success-bg);
    color: #166534;
}

.badge-warning {
    background: var(--warning-bg);
    color: #92400e;
}

.badge-danger {
    background: var(--error-bg);
    color: #991b1b;
}

/* ========================================
   11. Списки
   ======================================== */
.list-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.list-group-item {
    display: block;
    padding: 16px 20px;
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.list-group-item:hover {
    background: var(--primary-50);
    border-color: var(--primary-300);
    transform: translateX(4px);
}

.list-group-item-action {
    color: var(--gray-800);
}

/* ========================================
   12. Навигационная панель (Glassmorphism + Turquoise)
   ======================================== */
.navbar {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 2px 30px rgba(20, 184, 166, 0.15), 0 1px 3px rgba(0, 0, 0, 0.05);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 70px;
    border-bottom: 1px solid rgba(20, 184, 166, 0.2);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--emerald-dark);
    font-family: var(--font-heading);
    transition: all var(--transition-base);
    cursor: pointer;
    line-height: 1;
    z-index: 100;
    position: relative;
}

.navbar-logo:hover {
    transform: scale(1.05);
    text-shadow: 0 0 20px rgba(20, 184, 166, 0.3);
}

.navbar-logo-top {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    line-height: 1;
}

.navbar-logo-bottom {
    letter-spacing: 4px;
    padding-left: 36px;
    font-size: 1.3rem;
    line-height: 1;
    color: var(--primary-600);
}

.navbar-logo i {
    display: none;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    color: var(--gray-600);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.nav-link:hover {
    background: rgba(20, 184, 166, 0.08);
    color: var(--turquoise);
}

.nav-link:hover::after {
    width: 60%;
}

.nav-link.active {
    background: rgba(20, 184, 166, 0.12);
    color: var(--emerald-dark);
}

.nav-link.active::after {
    width: 80%;
}

.navbar-profile {
    display: flex;
    align-items: center;
    gap: 16px;
}

.username {
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--gray-700);
    padding: 8px 16px;
    background: var(--mint-light);
    border-radius: var(--radius-full);
    border: 1px solid var(--primary-200);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-base);
}

.username:hover {
    background: var(--primary-100);
    border-color: var(--primary-300);
    color: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(20, 184, 166, 0.2);
}

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--gray-100);
    color: var(--gray-600);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
}

.logout-btn:hover {
    background: var(--error-bg);
    color: var(--error);
    border-color: var(--error);
    transform: rotate(-5deg);
}

/* ========================================
   13. Dashboard контент (Detailed)
   ======================================== */
.dashboard-content {
    margin-top: 90px;
    padding: 40px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 2px solid var(--gray-200);
    position: relative;
}

.dashboard-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100px;
    height: 2px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

.dashboard-header h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-900);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.add-course-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: var(--primary-gradient);
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-bounce);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(132, 204, 22, 0.3);
    position: relative;
    overflow: hidden;
}

.add-course-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.add-course-btn:hover::before {
    width: 200px;
    height: 200px;
}

.add-course-btn:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-xl), 0 8px 25px rgba(132, 204, 22, 0.4);
}

/* ========================================
   14. Сетка курсов (Detailed)
   ======================================== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.course-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 0;
    box-shadow: var(--shadow-md), 0 0 0 1px rgba(20, 184, 166, 0.05);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(132, 204, 22, 0.05) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.course-card:hover::before {
    opacity: 1;
}

.course-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(132, 204, 22, 0.15), var(--shadow-glow);
    border-color: var(--primary-300);
}

.course-image {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    position: relative;
    overflow: hidden;
}

.course-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.2));
    pointer-events: none;
}

.course-image i {
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
    transition: all var(--transition-base);
}

.course-card:hover .course-image i {
    transform: scale(1.1) rotate(5deg);
}

.course-content {
    padding: 20px;
    margin: 0;
}

.course-direction {
    font-size: 0.85rem;
    color: var(--primary-600);
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.3;
}

.course-progress {
    margin-bottom: 20px;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--gray-600);
    font-weight: 500;
}

.progress-percent {
    font-weight: 700;
    color: var(--primary-600);
    font-size: 1rem;
}

.progress-bar-container {
    position: relative;
}

.progress-bar {
    height: 24px;
    background: linear-gradient(90deg, var(--gray-200), var(--gray-100));
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.12);
    border: 2px solid var(--gray-300);
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(132, 204, 22, 0.5);
}


.progress-segments {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    pointer-events: none;
}

.progress-segment {
    position: absolute;
    width: 4px;
    height: 16px;
    background: var(--gray-400);
    border-radius: var(--radius-full);
    transform: translateX(-50%);
    top: 50%;
    margin-top: -8px;
    transition: all var(--transition-base);
}

.progress-segment.active {
    background: var(--primary-500);
    box-shadow: 0 0 8px rgba(132, 204, 22, 0.5);
    height: 20px;
    margin-top: -10px;
}

.course-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.continue-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 20px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(132, 204, 22, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.continue-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.continue-btn:hover::before {
    left: 100%;
}

.continue-btn::after {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: calc(var(--radius-md) - 2px);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.15), transparent);
    pointer-events: none;
}

.continue-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(132, 204, 22, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.continue-btn:active {
    transform: translateY(0);
}

.course-action-buttons {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.action-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, var(--gray-50), white);
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.share-btn-small:hover {
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-color: var(--primary-300);
    color: var(--primary-600);
}

.edit-btn-small:hover {
    background: linear-gradient(135deg, var(--info-bg), #dbeafe);
    border-color: var(--info);
    color: var(--info);
}

.delete-btn-small {
    color: var(--error);
}

.delete-btn-small:hover {
    background: linear-gradient(135deg, var(--error-bg), #fee2e2);
    border-color: var(--error);
    color: var(--error);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2);
}

.course-meta {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    margin-top: 8px;
}

.like-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.like-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, var(--gray-50), white);
    color: var(--gray-400);
    border: 1px solid var(--gray-200);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.like-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
    background: linear-gradient(135deg, #fef2f2, #fee2e2);
    border-color: #fecaca;
    color: #ef4444;
}

.like-btn.liked {
    background: linear-gradient(135deg, #fef2f2, #fee2e2);
    border-color: #fca5a5;
    color: #ef4444;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.2);
}

.like-btn.liked:hover {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    border-color: #f87171;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.25);
}

.like-btn i {
    transition: transform var(--transition-base);
}

.like-btn:active i {
    transform: scale(0.8);
}

.like-count {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
    min-width: 20px;
}

.course-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.course-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: 16px;
    line-height: 1.5;
}

.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--gray-100);
}

.course-date {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.course-action-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gray-100);
    color: var(--gray-600);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.course-action-btn:hover {
    background: var(--primary-100);
    color: var(--primary-600);
}

/* ========================================
   15. Страница авторизации
   ======================================== */
.auth-page {
    background: var(--primary-gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-container {
    width: 100%;
    max-width: 440px;
}

.auth-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 48px;
    box-shadow: var(--shadow-2xl);
}

.auth-card h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.auth-card > div > p {
    color: var(--gray-500);
    font-size: 1rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 32px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px var(--primary-100);
}

.auth-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(132, 204, 22, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.auth-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.auth-btn:hover::before {
    left: 100%;
}

.auth-btn::after {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: calc(var(--radius-md) - 2px);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.15), transparent);
    pointer-events: none;
}

.auth-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 12px 30px rgba(132, 204, 22, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Submit button для форм */
.submit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 700;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(132, 204, 22, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    width: 100%;
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

.submit-btn:hover::before {
    left: 100%;
}

.submit-btn::after {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: calc(var(--radius-md) - 2px);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.15), transparent);
    pointer-events: none;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 12px 30px rgba(132, 204, 22, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.submit-btn:active {
    transform: translateY(-1px);
}

.auth-links {
    margin-top: 24px;
    text-align: center;
}

.auth-links p {
    color: var(--gray-600);
    margin-bottom: 0;
}

.auth-links a {
    color: var(--primary-600);
    font-weight: 600;
}

.auth-links a:hover {
    color: var(--primary-700);
}

/* ========================================
   16. Модальные окна (Detailed)
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: linear-gradient(180deg, white, #fafbfb);
    border-radius: var(--radius-2xl);
    padding: 32px;
    padding-right: 48px;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    overflow-x: hidden;
    box-shadow: var(--shadow-2xl), 0 0 0 1px rgba(20, 184, 166, 0.1);
    animation: modalSlideIn 0.3s ease;
    position: relative;
    border: 1px solid rgba(20, 184, 166, 0.2);
    box-sizing: border-box;
}

.modal-content > * {
    position: relative;
    z-index: 2;
}

.modal-content::-webkit-scrollbar {
    width: 10px;
    position: absolute;
    right: 0;
}

.modal-content::-webkit-scrollbar-track {
    background: #e2e8f0;
    border-radius: 0 var(--radius-full) var(--radius-full) 0;
    margin: 32px 0;
}

.modal-content::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-400), var(--primary-600));
    border-radius: var(--radius-full);
    border: 2px solid #e2e8f0;
    background-clip: padding-box;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--primary-500), var(--primary-700));
    background-clip: padding-box;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 12px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    z-index: 1;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
}

.modal-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-300), transparent);
    border-radius: var(--radius-full);
}

.modal-header h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gray-900);
}

.modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gray-100);
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.modal-close::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.modal-close:hover {
    background: var(--error-bg);
    color: var(--error);
    border-color: var(--error);
    transform: rotate(90deg);
}

.modal-close:hover::before {
    opacity: 1;
}

.modal-small {
    max-width: 420px;
}

/* ========================================
   17. Уведомления
   ======================================== */
.notification {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 16px 24px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    border-left: 4px solid var(--primary-500);
    z-index: 3000;
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

.notification.active {
    transform: translateX(0);
}

/* ========================================
   18. Страница курса (Detailed)
   ======================================== */
.course-page {
    margin-top: 90px;
    padding: 40px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.course-page-header {
    margin-bottom: 40px;
}

.course-page-header h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.course-meta {
    display: flex;
    gap: 24px;
    color: var(--gray-500);
    font-size: 0.95rem;
}

/* Страница просмотра курса */
.course-content-page {
    margin-top: 90px;
    padding: 40px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.course-header-section {
    margin-bottom: 40px;
    padding-bottom: 32px;
    border-bottom: 2px solid var(--gray-200);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    margin-bottom: 24px;
    transition: all var(--transition-base);
}

.back-btn:hover {
    background: var(--mint-light);
    border-color: var(--primary-300);
    color: var(--primary-700);
    transform: translateX(-4px);
}

.course-header-info {
    max-width: 900px;
}

.course-main-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--emerald-dark);
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.course-direction-label {
    font-size: 1.1rem;
    color: var(--primary-600);
    font-weight: 600;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.course-header-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.course-header-progress {
    margin-bottom: 24px;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 0.95rem;
    color: var(--gray-600);
    font-weight: 500;
}

#overallProgress {
    font-weight: 700;
    color: var(--primary-600);
}

.progress-bar-large {
    height: 28px;
    background: linear-gradient(90deg, var(--gray-200), var(--gray-100));
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.15);
    border: 2px solid var(--gray-300);
}

.progress-fill-large {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(132, 204, 22, 0.5);
}

/* Секция программы курса */
.topics-section {
    margin-top: 60px;
}

.topics-section h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    color: var(--emerald-dark);
    margin-bottom: 32px;
    position: relative;
    padding-bottom: 16px;
}

.topics-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

@media (max-width: 1200px) {
    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .topics-grid {
        grid-template-columns: 1fr;
    }
}

.topic-card {
    background: linear-gradient(180deg, white, var(--mint-light));
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-xl);
    padding: 24px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.topic-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg), 0 0 20px var(--primary-glow);
    border-color: var(--primary-300);
}

.topic-card:hover::before {
    opacity: 1;
}

.topic-card.completed {
    background: linear-gradient(180deg, var(--success-bg), white);
    border-color: var(--success);
}

.topic-card.completed .topic-status {
    background: var(--success);
    color: white;
}

.topic-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.topic-number {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary-600);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.topic-status {
    padding: 6px 12px;
    background: var(--gray-200);
    color: var(--gray-600);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.topic-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
    line-height: 1.3;
}

.topic-preview {
    font-size: 0.95rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 16px;
}

.topic-meta {
    display: flex;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-200);
}

.topic-duration,
.topic-difficulty {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--gray-500);
}

.topic-duration i,
.topic-difficulty i {
    color: var(--primary-500);
}

/* Кнопка "Открыть" в карточке модуля */
.open-topic-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    margin-top: 16px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 14px var(--primary-500, rgba(20, 184, 166, 0.3));
}

.open-topic-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-500, rgba(20, 184, 166, 0.4));
}

.open-topic-btn:active {
    transform: translateY(0);
}

.topic-card:hover .open-topic-btn {
    box-shadow: 0 6px 20px var(--primary-glow);
}

/* Контент курса */
.course-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.course-content h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--emerald-dark);
    margin-top: 32px;
    margin-bottom: 16px;
    padding-left: 12px;
    border-left: 3px solid var(--primary-500);
}

.course-content h3 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-top: 24px;
    margin-bottom: 12px;
}

.course-content h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-top: 20px;
    margin-bottom: 10px;
}

.course-content p {
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 16px;
    font-size: 1rem;
}

.course-content ul,
.course-content ol {
    margin: 20px 0;
    padding-left: 32px;
    color: var(--gray-600);
}

.course-content ul {
    list-style-type: none;
}

.course-content ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    line-height: 1.6;
}

.course-content ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-500);
    font-weight: 700;
    font-size: 1.1rem;
}

.course-content ol {
    counter-reset: item;
    list-style-type: none;
}

.course-content ol li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 12px;
    line-height: 1.6;
    counter-increment: item;
}

.course-content ol li::before {
    content: counter(item);
    position: absolute;
    left: 0;
    top: 2px;
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 24px;
    font-size: 0.85rem;
    font-weight: 700;
}

.course-content li {
    margin-bottom: 12px;
}

.course-content code {
    background: linear-gradient(180deg, var(--gray-100), var(--gray-50));
    padding: 4px 8px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
    color: var(--primary-700);
    border: 1px solid var(--gray-200);
    white-space: nowrap;
}

.course-content pre {
    background: linear-gradient(180deg, #1f2937, #111827);
    color: var(--gray-100);
    padding: 24px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 24px 0;
    border: 1px solid var(--gray-700);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

.course-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border: none;
    white-space: pre;
    font-size: 0.9em;
    line-height: 1.6;
}

.course-content blockquote {
    border-left: 4px solid var(--primary-500);
    padding: 20px 24px;
    margin: 24px 0;
    background: linear-gradient(90deg, var(--primary-50), white);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--gray-700);
    font-style: italic;
    box-shadow: 0 2px 8px rgba(20, 184, 166, 0.1);
}

.course-content blockquote p {
    margin: 0;
}

.course-content hr {
    border: none;
    border-top: 2px solid var(--primary-200);
    margin: 40px 0;
}

.course-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.course-content th,
.course-content td {
    padding: 16px;
    border: 1px solid var(--gray-200);
    text-align: left;
}

.course-content th {
    background: linear-gradient(180deg, var(--primary-100), var(--primary-200));
    font-weight: 700;
    color: var(--emerald-dark);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.course-content tr:nth-child(even) {
    background: var(--gray-50);
}

.course-content tr:hover {
    background: var(--primary-50);
}

/* ========================================
   19. Адаптивность
   ======================================== */
@media (max-width: 992px) {
    .navbar-container {
        padding: 0 24px;
    }

    .navbar-menu {
        display: none;
    }

    .dashboard-content {
        padding: 24px;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .auth-card {
        padding: 32px 24px;
    }

    .dashboard-header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .dashboard-header h1 {
        font-size: 1.75rem;
    }

    .course-page {
        padding: 24px;
    }

    .course-content {
        padding: 24px;
    }
}

/* ========================================
   20. Анимации
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease infinite;
}

/* ========================================
   21. Утилиты отступов
   ======================================== */
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 8px !important; }
.mb-2 { margin-bottom: 16px !important; }
.mb-3 { margin-bottom: 24px !important; }
.mb-4 { margin-bottom: 32px !important; }
.mb-5 { margin-bottom: 48px !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: 8px !important; }
.mt-2 { margin-top: 16px !important; }
.mt-3 { margin-top: 24px !important; }
.mt-4 { margin-top: 32px !important; }
.mt-5 { margin-top: 48px !important; }

/* ========================================
   22. Flash сообщения
   ======================================== */
.flash-messages {
    margin-bottom: 20px;
}

.flash-message {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    font-family: var(--font-body);
    font-weight: 500;
}

.flash-message.success {
    background: var(--success-bg);
    color: #166534;
    border: 1px solid var(--success);
}

.flash-message.error {
    background: var(--error-bg);
    color: #991b1b;
    border: 1px solid var(--error);
}

.flash-message.warning {
    background: var(--warning-bg);
    color: #92400e;
    border: 1px solid var(--warning);
}

.flash-message.info {
    background: var(--info-bg);
    color: #1e40af;
    border: 1px solid var(--info);
}

/* ========================================
   23. Share кнопки
   ======================================== */
.share-content {
    padding: 8px 0;
}

.share-content p {
    margin-bottom: 16px;
    color: var(--gray-600);
}

.share-link-container {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.share-link-container input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    background: var(--gray-50);
}

.copy-btn {
    padding: 12px 20px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-base);
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.share-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.share-btn.telegram {
    background: #229ED9;
    color: white;
}

.share-btn.vk {
    background: #0077FF;
    color: white;
}

.share-btn.copy {
    background: var(--gray-100);
    color: var(--gray-700);
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   24. Пустое состояние
   ======================================== */
.empty-state {
    text-align: center;
    padding: 80px 24px;
}

.empty-state-icon {
    font-size: 5rem;
    color: var(--primary-300);
    margin-bottom: 24px;
}

.empty-state h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.empty-state p {
    color: var(--gray-500);
    max-width: 400px;
    margin: 0 auto 24px;
}

/* ========================================
   25. Анимации (Detailed)
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(132, 204, 22, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(132, 204, 22, 0.5), 0 0 60px rgba(132, 204, 22, 0.3);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Классы анимаций */
.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.fade-in-up {
    animation: fadeInUp 0.7s ease forwards;
}

.fade-in-down {
    animation: fadeInDown 0.7s ease forwards;
}

.slide-in-left {
    animation: slideInLeft 0.6s ease forwards;
}

.slide-in-right {
    animation: slideInRight 0.6s ease forwards;
}

.scale-in {
    animation: scaleIn 0.5s ease forwards;
}

.float {
    animation: float 3s ease-in-out infinite;
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

.glow {
    animation: glow 2s ease-in-out infinite;
}

.shimmer {
    background: linear-gradient(90deg, 
        var(--primary-100) 0%, 
        var(--primary-200) 50%, 
        var(--primary-100) 100%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

.spin {
    animation: spin 1s linear infinite;
}

.bounce {
    animation: bounce 1s ease-in-out infinite;
}

/* Задержки анимаций */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-600 { animation-delay: 0.6s; }
.delay-700 { animation-delay: 0.7s; }
.delay-800 { animation-delay: 0.8s; }
.delay-900 { animation-delay: 0.9s; }
.delay-1000 { animation-delay: 1s; }

/* ========================================
   26. Декоративные элементы
   ======================================== */
/* Плавающие сферы на фоне */
.bg-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
}

.bg-orb-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(132, 204, 22, 0.3) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.bg-orb-2 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(163, 230, 53, 0.25) 0%, transparent 70%);
    bottom: -50px;
    left: -50px;
    animation: float 6s ease-in-out infinite reverse;
}

.bg-orb-3 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(101, 163, 13, 0.2) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float 10s ease-in-out infinite;
}

/* Градиентная сетка */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(132, 204, 22, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(132, 204, 22, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 1;
}

/* Декоративные разделители */
.divider {
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--primary-300) 20%, 
        var(--primary-300) 80%, 
        transparent 100%);
    margin: 40px 0;
    border: none;
}

.divider-dashed {
    height: 2px;
    background-image: linear-gradient(90deg, 
        var(--primary-300) 50%, 
        transparent 50%);
    background-size: 20px 2px;
    margin: 40px 0;
    border: none;
}

/* Точки-декорации */
.dot-pattern {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin: 20px 0;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-400);
    opacity: 0.5;
}

.dot:nth-child(2n) {
    background: var(--primary-500);
    opacity: 0.7;
}

.dot:nth-child(3n) {
    background: var(--primary-600);
    opacity: 1;
}

/* Уголки-декорации */
.corner-decoration {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-400);
    opacity: 0.5;
}

.corner-decoration.top-left {
    top: 10px;
    left: 10px;
    border-right: none;
    border-bottom: none;
}

.corner-decoration.top-right {
    top: 10px;
    right: 10px;
    border-left: none;
    border-bottom: none;
}

.corner-decoration.bottom-left {
    bottom: 10px;
    left: 10px;
    border-right: none;
    border-top: none;
}

.corner-decoration.bottom-right {
    bottom: 10px;
    right: 10px;
    border-left: none;
    border-top: none;
}

/* ========================================
   27. Progress bars (Detailed)
   ======================================== */
.progress-container {
    width: 100%;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    height: 8px;
}

.progress-bar {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.3) 50%, 
        transparent 100%);
    animation: shimmer 2s infinite;
}

/* ========================================
   28. Теги и чипсы
   ======================================== */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-700);
    transition: all var(--transition-base);
}

.tag:hover {
    background: var(--primary-100);
    border-color: var(--primary-300);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.tag-primary {
    background: var(--primary-100);
    border-color: var(--primary-300);
    color: var(--primary-700);
}

.tag-success {
    background: var(--success-bg);
    border-color: #86efac;
    color: #166534;
}

.tag-warning {
    background: var(--warning-bg);
    border-color: #fcd34d;
    color: #92400e;
}

/* ========================================
   29. Tooltip
   ======================================== */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: 8px 14px;
    background: var(--gray-900);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}

/* ========================================
   30. Avatar
   ======================================== */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid white;
    box-shadow: var(--shadow-md);
}

.avatar-lg {
    width: 56px;
    height: 56px;
    font-size: 1.25rem;
}

.avatar-xl {
    width: 80px;
    height: 80px;
    font-size: 1.75rem;
}

/* ========================================
   31. Skeleton loader
   ======================================== */
.skeleton {
    background: linear-gradient(90deg, 
        var(--gray-200) 25%, 
        var(--gray-100) 50%, 
        var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 16px;
}

.skeleton-circle {
    border-radius: 50%;
    width: 40px;
    height: 40px;
}

/* ========================================
   32. Course Tasks Modal
   ======================================== */
.tasks-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 3000;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.tasks-modal.active {
    display: flex;
}

.tasks-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.tasks-modal-content {
    background: linear-gradient(180deg, white, var(--mint-light));
    border-radius: var(--radius-2xl);
    padding: 0;
    width: 100%;
    max-width: 900px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-2xl), 0 0 0 1px rgba(20, 184, 166, 0.2);
    animation: modalSlideIn 0.3s ease;
    position: relative;
    border: 1px solid rgba(20, 184, 166, 0.3);
}

.tasks-modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.tasks-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 32px 32px 24px;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
}

.tasks-modal-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 32px;
    right: 32px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-300), transparent);
    border-radius: var(--radius-full);
}

.tasks-modal-header h2 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--emerald-dark);
}

.tasks-modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--gray-100);
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tasks-modal-close:hover {
    background: var(--error-bg);
    color: var(--error);
    border-color: var(--error);
    transform: rotate(90deg);
}

.tasks-modal-body {
    padding: 32px;
}

.empty-tasks {
    text-align: center;
    padding: 60px 24px;
}

.empty-tasks i {
    font-size: 4rem;
    color: var(--primary-300);
    margin-bottom: 24px;
}

.empty-tasks h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.empty-tasks p {
    color: var(--gray-500);
}

.tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.task-card {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.task-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.task-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md), 0 0 0 1px rgba(20, 184, 166, 0.1);
    border-color: var(--primary-300);
}

.task-card:hover::before {
    opacity: 1;
}

.task-card.completed {
    background: linear-gradient(180deg, var(--success-bg), white);
    border-color: var(--success);
}

.task-card.completed .task-checkbox i {
    color: var(--success);
}

.task-card-header {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.task-checkbox {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    font-size: 1.25rem;
    transition: all var(--transition-fast);
}

.task-card.completed .task-checkbox i {
    color: var(--success);
}

.task-info h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 8px;
}

.task-info p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--gray-600);
    margin: 0;
}

.task-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--gray-100);
}

.task-module {
    font-size: 0.8rem;
    color: var(--gray-500);
    font-weight: 500;
}

.task-type {
    padding: 4px 12px;
    background: var(--primary-50);
    color: var(--primary-700);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.task-card.completed .task-type {
    background: var(--success-bg);
    color: #166534;
}

/* Кнопка открытия заданий */
.open-tasks-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(20, 184, 166, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    margin-top: 20px;
}

.open-tasks-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.open-tasks-btn:hover::before {
    left: 100%;
}

.open-tasks-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(20, 184, 166, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* ========================================
   33. Topic Modal Buttons
   ======================================== */
.modal-footer {
    display: flex;
    gap: 16px;
    padding: 24px 32px;
    border-top: 1px solid var(--gray-200);
    background: linear-gradient(180deg, var(--gray-50), white);
    border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
}

.check-code-btn,
.complete-btn,
.submit-code-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.check-code-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    flex: 1;
}

.check-code-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.check-code-btn:hover::before {
    left: 100%;
}

.check-code-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.complete-btn {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(20, 184, 166, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    flex: 1;
}

.complete-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.complete-btn:hover::before {
    left: 100%;
}

.complete-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(20, 184, 166, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.submit-code-btn {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(20, 184, 166, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    width: 100%;
}

.submit-code-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.submit-code-btn:hover::before {
    left: 100%;
}

.submit-code-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(20, 184, 166, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* ========================================
   AI Assistant Button & Chat Panel
   ======================================== */

/* AI Assistant button in navbar */
.ai-assistant-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.ai-assistant-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.ai-assistant-btn:hover::before {
    left: 100%;
}

.ai-assistant-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.ai-assistant-btn i {
    font-size: 1.1rem;
    animation: pulse-robot 2s ease-in-out infinite;
}

@keyframes pulse-robot {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Chat Panel */
.chat-panel {
    position: fixed;
    top: 80px;
    right: -450px;
    width: 450px;
    height: calc(100vh - 100px);
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl), 0 0 40px rgba(102, 126, 234, 0.2);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.chat-panel.active {
    right: 20px;
}

/* Chat Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.chat-header-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    font-weight: 700;
}

.chat-header-title i {
    font-size: 1.3rem;
    animation: float-robot 3s ease-in-out infinite;
}

@keyframes float-robot {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.chat-header-actions {
    display: flex;
    gap: 8px;
}

.chat-btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-btn-icon:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: linear-gradient(180deg, #f9fafb 0%, #f3f4f6 100%);
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--primary-300);
    border-radius: var(--radius-full);
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--primary-400);
}

/* Message Styles */
.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: messageSlide 0.3s ease-out;
}

@keyframes messageSlide {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message.assistant-message {
    align-self: flex-start;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
}

.user-message .message-avatar {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    color: white;
}

.assistant-message .message-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.user-message .message-header {
    flex-direction: row-reverse;
}

.message-author {
    font-weight: 600;
    color: var(--gray-700);
}

.message-time {
    color: var(--gray-500);
    font-size: 0.75rem;
}

.message-text {
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    line-height: 1.5;
    font-size: 0.95rem;
}

.user-message .message-text {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.assistant-message .message-text {
    background: white;
    color: var(--gray-800);
    border-bottom-left-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.message-text pre {
    background: var(--gray-800);
    color: #f8fafc;
    padding: 12px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 8px 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
}

.message-text code {
    background: var(--gray-200);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
}

.message-text pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

.message-text ul,
.message-text ol {
    margin: 8px 0;
    padding-left: 20px;
}

.message-text li {
    margin: 4px 0;
}

.message-text strong {
    font-weight: 700;
}

.message-text em {
    font-style: italic;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--primary-400);
    border-radius: 50%;
    animation: typing 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Chat Input */
.chat-input-container {
    display: flex;
    gap: 12px;
    padding: 16px 20px;
    background: white;
    border-top: 1px solid var(--gray-200);
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-family: var(--font-body);
    font-size: 0.95rem;
    resize: none;
    max-height: 120px;
    transition: all var(--transition-fast);
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
}

.chat-input:disabled {
    background: var(--gray-100);
    cursor: not-allowed;
}

.chat-send-btn {
    width: 48px;
    height: 48px;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.chat-send-btn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.chat-send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Responsive */
@media (max-width: 768px) {
    .chat-panel {
        width: 100%;
        height: 100vh;
        top: 0;
        right: -100%;
        border-radius: 0;
    }

    .chat-panel.active {
        right: 0;
    }

    .ai-assistant-btn span {
        display: none;
    }

    .ai-assistant-btn i {
        font-size: 1.3rem;
    }
}