/* AI Academy HK - Main Stylesheet */
/* Modern, Professional Design for AI News Platform */

/* ============================================
   CSS Variables & Custom Properties
   ============================================ */
:root {
    /* Primary Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);

    /* Secondary Colors */
    --secondary-color: #0ea5e9;
    --secondary-dark: #0284c7;
    --secondary-light: #38bdf8;

    /* Accent Colors */
    --accent-color: #f59e0b;
    --accent-light: #fbbf24;
    --success-color: #10b981;
    --error-color: #ef4444;

    /* Neutral Colors */
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;

    /* Dark Mode Colors */
    --dark-bg-primary: #0f172a;
    --dark-bg-secondary: #1e293b;
    --dark-bg-tertiary: #334155;
    --dark-text-primary: #f1f5f9;
    --dark-text-secondary: #cbd5e1;
    --dark-border-color: #475569;

    /* Typography */
    --font-primary: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'Fira Code', 'Monaco', 'Consolas', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Container */
    --container-max: 1280px;
    --container-padding: 1.5rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-muted: #94a3b8;
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-tertiary: var(--dark-bg-tertiary);
    --border-color: var(--dark-border-color);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

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

.section {
    padding: var(--space-3xl) 0;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.95);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-md) var(--container-padding);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo:hover {
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.75rem;
}

.logo-hk {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    position: relative;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--space-sm) 0;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.theme-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--border-color);
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

.search-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: background var(--transition-fast);
}

.search-btn:hover {
    background: var(--border-color);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* ============================================
   Search Modal
   ============================================ */
.search-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
}

.search-modal-content {
    background: var(--bg-primary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 600px;
    transform: translateY(-20px);
    transition: transform var(--transition-base);
}

.search-modal.active .search-modal-content {
    transform: translateY(0);
}

.close-search {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.search-modal h2 {
    margin-bottom: var(--space-lg);
    font-size: 1.5rem;
}

.search-input-wrapper {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.search-input-wrapper input {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.search-input-wrapper input:focus {
    border-color: var(--primary-color);
}

.search-submit {
    padding: var(--space-md) var(--space-xl);
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-lg);
    font-weight: 600;
}

.search-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
}

.suggestion-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.suggestion-tag {
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.suggestion-tag:hover {
    background: var(--primary-color);
    color: white;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 120px var(--container-padding) var(--space-3xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #1e1b4b 100%);
    z-index: -1;
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(168, 85, 247, 0.2) 0%, transparent 60%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    color: white;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.6s ease 0.1s backwards;
}

.hero-title .gradient-text {
    background: linear-gradient(135deg, #a78bfa 0%, #f472b6 50%, #fbbf24 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-3xl);
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
}

.stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255, 255, 255, 0.6);
    border-bottom: 2px solid rgba(255, 255, 255, 0.6);
    transform: rotate(45deg);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

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

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

.btn-small {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-md);
}

.btn-small:hover {
    transform: translateY(-1px);
    color: white;
}

/* ============================================
   News Ticker
   ============================================ */
.news-ticker {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-sm) 0;
    overflow: hidden;
}

.ticker-label {
    flex-shrink: 0;
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary-gradient);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.ticker-wrapper {
    flex: 1;
    overflow: hidden;
}

.ticker-content {
    display: flex;
    gap: var(--space-3xl);
    animation: ticker 30s linear infinite;
    white-space: nowrap;
}

.ticker-item {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@keyframes ticker {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-title {
    display: inline-flex;
    align-items: center;
    gap: var(--space-md);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.title-icon {
    font-size: 1.25em;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   News Section
   ============================================ */
.news-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-xl);
}

.filter-btn {
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

/* Featured News */
.featured-news {
    margin-bottom: var(--space-xl);
}

.featured-card {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
}

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

/* Make entire featured card clickable */
.featured-card .card-link {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.featured-card .read-more {
    position: relative;
    z-index: 2;
}

.featured-image {
    position: relative;
    min-height: 300px;
}

.image-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-icon {
    font-size: 4rem;
}

.gradient-bg-1 { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.gradient-bg-2 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.gradient-bg-3 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.gradient-bg-4 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.gradient-bg-5 { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.gradient-bg-6 { background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); }
.gradient-bg-7 { background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%); }

.news-badge {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    padding: var(--space-xs) var(--space-md);
    background: var(--accent-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.featured-content {
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-meta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    font-size: 0.875rem;
}

.news-meta .category {
    color: var(--primary-color);
    font-weight: 600;
}

.news-meta .date {
    color: var(--text-muted);
}

.featured-title {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: var(--space-md);
}

.featured-excerpt {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.read-more {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

.read-more:hover {
    color: var(--primary-dark);
}

/* News Grid */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.news-card {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
}

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

/* Make entire card clickable */
.news-card .card-link {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.news-card .read-more {
    position: relative;
    z-index: 2;
}

.card-image {
    position: relative;
    height: 180px;
}

.card-content {
    padding: var(--space-lg);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: var(--space-sm);
}

.card-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.load-more {
    text-align: center;
}

/* ============================================
   GenAI Section
   ============================================ */
.genai-section {
    background: var(--bg-secondary);
}

.genai-categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.genai-card {
    background: var(--bg-primary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.genai-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.genai-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.genai-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.genai-card > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 0.9375rem;
}

.genai-list {
    margin-bottom: var(--space-lg);
}

.genai-list li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.genai-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* Comparison Tool */
.genai-comparison {
    background: var(--bg-primary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.comparison-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    text-align: center;
}

.comparison-desc {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--space-xl);
}

.comparison-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.model-select {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.model-select label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.model-select select {
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-width: 180px;
    cursor: pointer;
}

.vs-badge {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-muted);
}

.comparison-chart {
    max-width: 600px;
    margin: 0 auto var(--space-lg);
}

.chart-row {
    margin-bottom: var(--space-md);
}

.chart-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    font-size: 0.875rem;
}

.chart-bars {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.bar {
    height: 28px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--space-md);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    transition: width var(--transition-slow);
}

.bar-a {
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
}

.bar-b {
    background: linear-gradient(90deg, var(--secondary-color), var(--secondary-light));
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: var(--radius-sm);
}

.legend-a {
    background: var(--primary-color);
}

.legend-b {
    background: var(--secondary-color);
}

/* ============================================
   Trends Section
   ============================================ */
.trends-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--space-xl);
}

.trend-card {
    background: var(--bg-secondary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    grid-column: span 4;
}

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

.trend-card.trend-featured {
    grid-column: span 8;
    background: var(--primary-gradient);
    color: white;
    border: none;
}

.trend-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}

.trend-number {
    font-size: 2rem;
    font-weight: 800;
    opacity: 0.3;
}

.trend-badge {
    padding: var(--space-xs) var(--space-md);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.trend-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.trend-content {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.trend-featured .trend-content {
    color: rgba(255, 255, 255, 0.9);
}

.trend-stats {
    display: flex;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.trend-stats .stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
}

.stat-desc {
    font-size: 0.75rem;
    opacity: 0.8;
}

.trend-link {
    color: var(--primary-color);
    font-weight: 600;
}

.trend-featured .trend-link {
    color: white;
}

/* ============================================
   Resources Section
   ============================================ */
.resources-section {
    background: var(--bg-secondary);
}

.resources-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.resource-card {
    background: var(--bg-primary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

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

.resource-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.resource-card h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.resource-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-md);
}

.resource-level {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Glossary */
.glossary-list {
    max-width: 800px;
    margin: 0 auto;
}

.glossary-item {
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    border: 1px solid var(--border-color);
}

.glossary-item dt {
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    color: var(--primary-color);
}

.glossary-item dd {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   Newsletter Section
   ============================================ */
.newsletter-section {
    padding: var(--space-xl) 0;
}

.newsletter-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--primary-gradient);
    padding: var(--space-3xl);
    border-radius: var(--radius-2xl);
    color: white;
}

.newsletter-content {
    max-width: 500px;
}

.newsletter-content h2 {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
}

.newsletter-content > p {
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.newsletter-form .form-group {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.newsletter-form input {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.newsletter-form input:focus {
    outline: none;
    border-color: white;
}

.newsletter-form .btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: none;
}

.newsletter-form .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

.form-note {
    font-size: 0.75rem;
    opacity: 0.7;
}

.newsletter-illustration {
    display: flex;
    align-items: center;
    justify-content: center;
}

.mail-icon {
    font-size: 6rem;
    animation: float 3s ease-in-out infinite;
}

/* ============================================
   About Section
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.about-text h3 {
    font-size: 1.75rem;
    margin-bottom: var(--space-lg);
}

.about-text > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.feature {
    display: flex;
    gap: var(--space-md);
}

.feature-icon {
    font-size: 1.5rem;
}

.feature h4 {
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.feature p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.stats-card {
    background: var(--primary-gradient);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    color: white;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.stats-item {
    text-align: center;
}

.stats-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
}

.stats-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ============================================
   SEO Section
   ============================================ */
.seo-section {
    background: var(--bg-secondary);
    padding: var(--space-3xl) 0;
}

.seo-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xl);
    text-align: center;
    color: var(--text-primary);
}

.seo-text {
    max-width: 900px;
    margin: 0 auto;
}

.seo-text p {
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: var(--space-lg);
    text-align: justify;
}

.seo-text strong {
    color: var(--text-primary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--dark-bg-primary);
    color: var(--dark-text-secondary);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: white;
    margin-bottom: var(--space-lg);
}

.footer-logo:hover {
    color: white;
}

.footer-desc {
    color: var(--dark-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-bg-secondary);
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    transition: background var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-color);
}

.footer-links h4 {
    color: white;
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-links a {
    color: var(--dark-text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--dark-border-color);
}

.footer-bottom p {
    font-size: 0.875rem;
}

.footer-note {
    margin-top: var(--space-sm);
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-full);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

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

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .trends-grid {
        grid-template-columns: 1fr;
    }

    .trend-card,
    .trend-card.trend-featured {
        grid-column: span 1;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-stats {
        order: -1;
    }

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

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--space-xl);
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    [data-theme="dark"] .nav-menu {
        background: var(--dark-bg-primary);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .featured-card {
        grid-template-columns: 1fr;
    }

    .featured-image {
        min-height: 200px;
    }

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

    .genai-categories {
        grid-template-columns: 1fr;
    }

    .comparison-selector {
        flex-direction: column;
    }

    .newsletter-card {
        flex-direction: column;
        text-align: center;
    }

    .newsletter-form .form-group {
        flex-direction: column;
    }

    .newsletter-illustration {
        display: none;
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .resources-tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }

    .stats-card {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .navbar,
    .news-ticker,
    .back-to-top,
    .newsletter-section,
    .search-modal {
        display: none !important;
    }

    .hero {
        min-height: auto;
        padding: var(--space-xl);
    }

    body {
        color: black;
        background: white;
    }
}