/* ============================================
   Developer Academy - 기술교육 온라인 플랫폼
   ============================================ */

:root {
    --primary: #6C5CE7;
    --primary-dark: #5A4BD1;
    --primary-light: #A29BFE;
    --secondary: #00CEC9;
    --accent: #FD79A8;
    --success: #00B894;
    --warning: #FDCB6E;
    --danger: #E17055;
    --dark: #2D3436;
    --dark-light: #636E72;
    --gray: #B2BEC3;
    --gray-light: #DFE6E9;
    --bg: #F8F9FC;
    --bg-dark: #0C0C1D;
    --bg-card: #FFFFFF;
    --code-bg: #1E1E2E;
    --gradient-primary: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
    --gradient-dark: linear-gradient(135deg, #0C0C1D 0%, #1A1A3E 100%);
    --gradient-accent: linear-gradient(135deg, #FD79A8 0%, #FDCB6E 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 30px rgba(108,92,231,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-sans: 'Noto Sans KR', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font-sans);
    color: var(--dark);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }

img { max-width: 100%; height: auto; }

/* ========== HEADER ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--dark);
}

.site-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.1rem;
}

.site-logo span.highlight { color: var(--primary); }

.main-nav { display: flex; align-items: center; gap: 4px; }

.main-nav a {
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--dark-light);
    position: relative;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--primary);
    background: rgba(108,92,231,0.06);
}

.header-actions { display: flex; align-items: center; gap: 12px; }

.search-toggle {
    width: 42px;
    height: 42px;
    border: none;
    background: var(--bg);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-light);
    font-size: 1rem;
    transition: var(--transition);
}

.search-toggle:hover { background: rgba(108,92,231,0.1); color: var(--primary); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
    line-height: 1.4;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 15px rgba(108,92,231,0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(108,92,231,0.4);
}

.btn-secondary {
    background: var(--bg);
    color: var(--dark);
    border: 1px solid var(--gray-light);
}

.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover { background: var(--primary); color: #fff; }

.btn-large { padding: 14px 36px; font-size: 1rem; border-radius: var(--radius-md); }

.btn-ghost { background: rgba(255,255,255,0.15); color: #fff; backdrop-filter: blur(10px); }

.btn-ghost:hover { background: rgba(255,255,255,0.25); }

.btn-success { background: var(--success); color: #fff; }

.btn-success:hover { background: #00a884; }

/* ========== MOBILE MENU ========== */
.mobile-menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: none;
    background: none;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.mobile-menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ========== SEARCH OVERLAY ========== */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 120px;
}

.search-overlay.active { display: flex; }

.search-box {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 8px;
    width: 90%;
    max-width: 680px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    padding: 16px 20px;
    font-size: 1.1rem;
    font-family: var(--font-sans);
    background: none;
}

.search-box button {
    width: 52px;
    height: 52px;
    border: none;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
}

/* ========== HERO SECTION ========== */
.hero {
    padding: 160px 32px 100px;
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(108,92,231,0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,206,201,0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(108,92,231,0.2);
    color: var(--primary-light);
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(108,92,231,0.3);
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero h1 .gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 36px;
    line-height: 1.8;
    max-width: 520px;
}

.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
}

.hero-stat {
    color: #fff;
}

.hero-stat .number {
    font-size: 2rem;
    font-weight: 800;
    display: block;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-stat .label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    font-weight: 500;
}

/* Hero Code Block */
.hero-visual {
    position: relative;
}

.code-window {
    background: var(--code-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.08);
}

.code-window-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dot.red { background: #FF5F56; }
.code-dot.yellow { background: #FFBD2E; }
.code-dot.green { background: #27C93F; }

.code-window-title {
    margin-left: 12px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: rgba(255,255,255,0.4);
}

.code-window pre {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    color: #CDD6F4;
    overflow-x: auto;
}

.code-window .keyword { color: #CBA6F7; }
.code-window .function { color: #89B4FA; }
.code-window .string { color: #A6E3A1; }
.code-window .comment { color: #6C7086; }
.code-window .number { color: #FAB387; }
.code-window .operator { color: #89DCEB; }

.floating-badge {
    position: absolute;
    background: #fff;
    border-radius: var(--radius-md);
    padding: 14px 20px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: float 3s ease-in-out infinite;
}

.floating-badge.top-right { top: -20px; right: -20px; animation-delay: 0s; }
.floating-badge.bottom-left { bottom: 20px; left: -30px; animation-delay: 1.5s; }

.floating-badge i { font-size: 1.5rem; }
.floating-badge .badge-text { font-weight: 600; font-size: 0.85rem; }
.floating-badge .badge-sub { font-size: 0.75rem; color: var(--dark-light); }

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

/* ========== SECTIONS ========== */
.section {
    padding: 100px 32px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--dark-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== CATEGORIES ========== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.category-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--gray-light);
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary-light);
}

.category-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin: 0 auto 16px;
    color: #fff;
}

.category-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.category-card .count {
    font-size: 0.85rem;
    color: var(--dark-light);
}

/* ========== COURSE CARDS ========== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.course-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--gray-light);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.course-thumb {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--gradient-primary);
}

.course-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover .course-thumb img { transform: scale(1.05); }

.course-thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255,255,255,0.5);
}

.course-level-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
}

.level-beginner { background: var(--success); }
.level-intermediate { background: var(--primary); }
.level-advanced { background: var(--danger); }

.course-free-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--accent);
    color: #fff;
}

.course-info {
    padding: 24px;
}

.course-category {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.course-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-card h3 a:hover { color: var(--primary); }

.course-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--dark-light);
}

.course-meta span { display: flex; align-items: center; gap: 5px; }
.course-meta i { font-size: 0.8rem; color: var(--primary-light); }

.course-instructor-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-top: 16px;
    border-top: 1px solid var(--gray-light);
}

.course-instructor-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    overflow: hidden;
}

.course-instructor-avatar img { width: 100%; height: 100%; object-fit: cover; }

.course-instructor-name {
    flex: 1;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--dark-light);
}

.course-price {
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--dark);
}

.original-price {
    text-decoration: line-through;
    color: var(--gray);
    font-weight: 400;
    font-size: 0.85rem;
    margin-right: 4px;
}

.sale-price { color: var(--danger); }

.course-rating {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
}

.stars { color: #FDCB6E; font-size: 0.8rem; }
.rating-count { font-size: 0.8rem; color: var(--dark-light); }

/* ========== COURSE FILTER ========== */
.course-filter {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 50px;
    border: 1px solid var(--gray-light);
    background: #fff;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
    color: var(--dark-light);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ========== FEATURES ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    border: 1px solid var(--gray-light);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: #fff;
}

.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 0.92rem; color: var(--dark-light); line-height: 1.7; }

/* ========== INSTRUCTOR ========== */
.instructors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.instructor-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--gray-light);
    transition: var(--transition);
}

.instructor-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.instructor-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 16px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    font-weight: 700;
    overflow: hidden;
}

.instructor-avatar img { width: 100%; height: 100%; object-fit: cover; }

.instructor-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.instructor-card .position { font-size: 0.85rem; color: var(--dark-light); margin-bottom: 4px; }
.instructor-card .company { font-size: 0.8rem; color: var(--primary); font-weight: 600; }

.instructor-social {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
}

.instructor-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark-light);
    font-size: 0.9rem;
    transition: var(--transition);
}

.instructor-social a:hover {
    background: var(--primary);
    color: #fff;
}

/* ========== CTA SECTION ========== */
.cta-section {
    padding: 100px 32px;
    background: var(--gradient-dark);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(108,92,231,0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-inner {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.cta-section h2 {
    font-size: 2.4rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.6);
    margin-bottom: 36px;
}

/* ========== SINGLE COURSE ========== */
.course-hero {
    padding: 120px 32px 60px;
    background: var(--gradient-dark);
    color: #fff;
}

.course-hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    align-items: start;
}

.course-breadcrumb {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-bottom: 16px;
}

.course-breadcrumb a { color: rgba(255,255,255,0.5); }
.course-breadcrumb a:hover { color: #fff; }

.course-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.course-hero .excerpt {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 24px;
    line-height: 1.7;
}

.course-meta-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 24px;
}

.course-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

.course-meta-item i { color: var(--primary-light); }

/* Enrollment Card */
.enrollment-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 90px;
}

.enrollment-card .preview-area {
    width: 100%;
    height: 220px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
}

.enrollment-card .preview-area img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-btn {
    width: 64px;
    height: 64px;
    background: rgba(255,255,255,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary);
    position: absolute;
    transition: var(--transition);
}

.play-btn:hover { transform: scale(1.1); background: #fff; }

.enrollment-body {
    padding: 28px;
}

.enrollment-price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 20px;
}

.enrollment-body .btn { width: 100%; margin-bottom: 12px; padding: 14px; font-size: 1rem; }

.enrollment-features {
    list-style: none;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-light);
}

.enrollment-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 0.9rem;
    color: var(--dark-light);
}

.enrollment-features li i { color: var(--success); width: 16px; }

/* Course Content */
.course-content-section {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 32px;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
}

.curriculum-section { margin-bottom: 40px; }
.curriculum-section h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 20px; }

.lesson-list {
    border: 1px solid var(--gray-light);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-light);
    transition: var(--transition);
}

.lesson-item:last-child { border-bottom: none; }
.lesson-item:hover { background: var(--bg); }

.lesson-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--dark-light);
    flex-shrink: 0;
}

.lesson-item.completed .lesson-number {
    background: var(--success);
    color: #fff;
}

.lesson-title { flex: 1; font-size: 0.95rem; font-weight: 500; }
.lesson-duration { font-size: 0.85rem; color: var(--dark-light); }
.lesson-preview-tag {
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
    padding: 2px 8px;
    background: rgba(108,92,231,0.08);
    border-radius: 50px;
}

/* ========== PROGRESS BAR ========== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-light);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 0.5s ease;
}

/* ========== DASHBOARD ========== */
.dashboard-section {
    padding: 120px 32px 80px;
    max-width: 1200px;
    margin: 0 auto;
}

.dashboard-header {
    margin-bottom: 40px;
}

.dashboard-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 24px;
    border: 1px solid var(--gray-light);
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    margin-bottom: 12px;
}

.stat-card .stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--dark-light);
}

.dashboard-courses h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.enrolled-course-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 20px;
    border: 1px solid var(--gray-light);
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
    transition: var(--transition);
}

.enrolled-course-card:hover { box-shadow: var(--shadow-sm); }

.enrolled-course-thumb {
    width: 160px;
    height: 100px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    font-size: 1.5rem;
}

.enrolled-course-thumb img { width: 100%; height: 100%; object-fit: cover; }

.enrolled-course-info { flex: 1; }
.enrolled-course-info h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }

.progress-text {
    font-size: 0.85rem;
    color: var(--dark-light);
    margin-bottom: 8px;
}

/* ========== ARCHIVE PAGES ========== */
.archive-hero {
    padding: 140px 32px 60px;
    background: var(--gradient-dark);
    text-align: center;
    color: #fff;
}

.archive-hero h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 12px; }
.archive-hero p { font-size: 1.05rem; color: rgba(255,255,255,0.6); }

/* ========== FOOTER ========== */
.site-footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 80px 32px 32px;
}

.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand .site-logo { color: #fff; }

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.footer-social a:hover { background: var(--primary); color: #fff; }

.footer-links h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
}

.footer-links ul { list-style: none; }

.footer-links li { margin-bottom: 10px; }

.footer-links a {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.5);
}

.footer-links a:hover { color: var(--primary-light); }

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.3);
}

/* ========== LOGIN / REGISTER ========== */
.auth-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 32px 60px;
    background: var(--bg);
}

.auth-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 48px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-md);
}

.auth-card h2 {
    font-size: 1.6rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 8px;
}

.auth-card .subtitle {
    text-align: center;
    color: var(--dark-light);
    margin-bottom: 32px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-light);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108,92,231,0.1);
}

/* ========== PAGINATION ========== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 48px;
}

.pagination a, .pagination span {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    border: 1px solid var(--gray-light);
    transition: var(--transition);
}

.pagination a:hover { border-color: var(--primary); color: var(--primary); }

.pagination .current {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
    .hero h1 { font-size: 2.4rem; }
    .courses-grid { grid-template-columns: repeat(2, 1fr); }
    .categories-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .instructors-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: repeat(2, 1fr); }
    .course-hero-inner { grid-template-columns: 1fr; }
    .course-content-section { grid-template-columns: 1fr; }
    .enrollment-card { position: static; }
    .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .main-nav { display: none; }
    .mobile-menu-toggle { display: flex; }

    .main-nav.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--gray-light);
    }

    .hero { padding: 120px 20px 60px; min-height: auto; }
    .hero h1 { font-size: 1.8rem; }
    .hero p { font-size: 1rem; }
    .hero-stats { gap: 20px; }
    .hero-stat .number { font-size: 1.5rem; }
    .hero-buttons { flex-direction: column; }

    .section { padding: 60px 20px; }
    .section-title { font-size: 1.8rem; }
    .courses-grid { grid-template-columns: 1fr; }
    .categories-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: 1fr; }
    .instructors-grid { grid-template-columns: repeat(2, 1fr); }

    .footer-inner { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }

    .header-inner { padding: 0 16px; }
    .dashboard-stats { grid-template-columns: 1fr 1fr; }
    .enrolled-course-card { flex-direction: column; }
    .enrolled-course-thumb { width: 100%; height: 160px; }
}

@media (max-width: 480px) {
    .categories-grid { grid-template-columns: 1fr; }
    .instructors-grid { grid-template-columns: 1fr; }
    .dashboard-stats { grid-template-columns: 1fr; }
    .course-filter { justify-content: center; }
}

/* ========== UTILITY ========== */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mt-40 { margin-top: 40px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }

/* ========== LOADING ========== */
.skeleton {
    background: linear-gradient(90deg, var(--gray-light) 25%, #eee 50%, var(--gray-light) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ========== TOAST ========== */
.toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    background: var(--dark);
    color: #fff;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
}

.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }