/* ========================================
   AI 前线 - 炫酷科技风格 CSS
   ======================================== */

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg-dark: #0a0a0f;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.3);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 粒子背景 */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* 容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    position: relative;
    z-index: 1;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 15px 0;
    transition: all 0.3s;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    font-size: 32px;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: color 0.3s;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: width 0.3s;
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
    animation: heroBgFloat 20s ease-in-out infinite;
}

@keyframes heroBgFloat {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.1) rotate(5deg); }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(99, 102, 241, 0.2);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50px;
    padding: 10px 20px;
    font-size: 14px;
    margin-bottom: 30px;
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.5);
        opacity: 0.5;
    }
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 25px;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.typing-text {
    position: relative;
    display: inline-block;
}

.typing-text::after {
    content: '|';
    animation: blink 1s infinite;
    color: var(--primary-light);
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 50px;
    margin-bottom: 40px;
}

.stat {
    text-align: left;
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-label {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 8px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.ai-brain {
    position: relative;
    width: 400px;
    height: 400px;
}

.brain-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid transparent;
    border-radius: 50%;
}

.brain-ring:nth-child(1) {
    width: 100%;
    height: 100%;
    border-top-color: var(--primary);
    border-right-color: var(--primary);
    animation: rotate 8s linear infinite;
}

.brain-ring:nth-child(2) {
    width: 75%;
    height: 75%;
    border-bottom-color: var(--secondary);
    border-left-color: var(--secondary);
    animation: rotate 6s linear infinite reverse;
}

.brain-ring:nth-child(3) {
    width: 50%;
    height: 50%;
    border-top-color: var(--accent);
    border-right-color: var(--accent);
    animation: rotate 4s linear infinite;
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.brain-core {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 3s ease-in-out infinite;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
}

.mouse {
    width: 26px;
    height: 42px;
    border: 2px solid var(--border);
    border-radius: 20px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* ========================================
   Ticker
   ======================================== */
.ticker {
    background: rgba(99, 102, 241, 0.1);
    border-top: 1px solid rgba(99, 102, 241, 0.2);
    border-bottom: 1px solid rgba(99, 102, 241, 0.2);
    padding: 15px 0;
    overflow: hidden;
}

.ticker-track {
    display: flex;
    animation: tickerScroll 30s linear infinite;
}

.ticker-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 40px;
    white-space: nowrap;
    color: var(--text-secondary);
    font-size: 14px;
}

.ticker-icon {
    font-size: 18px;
}

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

/* ========================================
   Section
   ======================================== */
section {
    padding: 100px 0;
}

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

.section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--primary-light);
    margin-bottom: 15px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Models Section
   ======================================== */
.models-section {
    background: rgba(99, 102, 241, 0.02);
}

.model-tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
}

.tab-btn.active {
    background: var(--gradient-1);
    border-color: transparent;
    color: #fff;
}

.tab-icon {
    font-size: 20px;
}

.model-content {
    min-height: 400px;
}

.model-detail {
    display: none;
    animation: fadeIn 0.5s ease;
}

.model-detail.active {
    display: block;
}

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

.model-header {
    display: flex;
    align-items: center;
    gap: 30px;
    margin-bottom: 40px;
}

.model-logo {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    font-weight: 800;
    color: #fff;
    border-radius: 24px;
}

.gemini-gradient {
    background: linear-gradient(135deg, #4285f4 0%, #34a853 50%, #fbbc04 100%);
}

.claude-gradient {
    background: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);
}

.gpt-gradient {
    background: linear-gradient(135deg, #10a37f 0%, #06b6d4 100%);
}

.model-info h3 {
    font-size: 32px;
    margin-bottom: 8px;
}

.model-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 15px;
}

.model-badges {
    display: flex;
    gap: 12px;
}

.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
}

.badge.gold {
    background: rgba(245, 158, 11, 0.2);
    border-color: rgba(245, 158, 11, 0.3);
    color: var(--warning);
}

.badge.purple {
    background: rgba(139, 92, 246, 0.2);
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--secondary);
}

.badge.green {
    background: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.model-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.3s;
}

.model-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-5px);
}

.model-card h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--primary-light);
}

.model-card ul {
    list-style: none;
}

.model-card li {
    padding: 10px 0;
    color: var(--text-secondary);
    font-size: 14px;
    border-bottom: 1px solid var(--border);
}

.model-card li:last-child {
    border-bottom: none;
}

.model-card li::before {
    content: '▸';
    color: var(--primary);
    margin-right: 10px;
}

.performance-bar {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.performance-bar span:first-child {
    width: 70px;
    font-size: 13px;
    color: var(--text-secondary);
}

.performance-bar .bar {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.performance-bar .fill {
    height: 100%;
    background: var(--gradient-1);
    border-radius: 10px;
    animation: fillBar 1.5s ease-out forwards;
}

.fill.claude-fill {
    background: linear-gradient(135deg, #8b5cf6 0%, #d946ef 100%);
}

.fill.gpt-fill {
    background: linear-gradient(135deg, #10a37f 0%, #06b6d4 100%);
}

@keyframes fillBar {
    from { width: 0; }
}

.performance-bar .value {
    width: 40px;
    text-align: right;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-light);
}

.use-cases {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 20px;
    font-size: 13px;
    color: var(--primary-light);
}

/* ========================================
   Applications Section
   ======================================== */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.app-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.app-card:hover::before {
    transform: scaleX(1);
}

.app-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.15);
}

.app-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}

.app-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.app-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 20px;
}

.app-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.app-tags span {
    padding: 5px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    font-size: 12px;
    color: var(--text-muted);
}

/* ========================================
   Tools Section
   ======================================== */
.tools-section {
    background: rgba(139, 92, 246, 0.02);
}

.tools-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.tools-category h3 {
    font-size: 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tools-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.tool-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
}

.tool-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.tool-name {
    font-size: 16px;
    font-weight: 600;
}

.tool-hot {
    padding: 4px 10px;
    background: var(--gradient-1);
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ========================================
   Learn Section
   ======================================== */
.learn-paths {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.path-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 35px 30px;
    position: relative;
    transition: all 0.4s;
}

.path-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(99, 102, 241, 0.2);
}

.path-level {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.path-level.beginner {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.path-level.intermediate {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

.path-level.advanced {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.level-badge {
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.path-card h3 {
    font-size: 22px;
    margin-bottom: 20px;
}

.path-topics {
    list-style: none;
    margin-bottom: 25px;
}

.path-topics li {
    padding: 10px 0;
    color: var(--text-secondary);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.path-topics li::before {
    content: '✓';
    color: var(--success);
}

.path-link {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: gap 0.3s;
}

.path-link:hover {
    gap: 12px;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.resource-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 25px;
}

.resource-item h4 {
    font-size: 16px;
    margin-bottom: 15px;
    color: var(--primary-light);
}

.resource-item ul {
    list-style: none;
}

.resource-item li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.resource-item li::before {
    content: '→';
    color: var(--primary);
    margin-right: 10px;
}

/* ========================================
   News Section
   ======================================== */
.news-section {
    background: rgba(6, 182, 212, 0.02);
}

.news-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.news-timeline::before {
    content: '';
    position: absolute;
    left: 80px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary), var(--accent));
}

.timeline-item {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-date {
    width: 80px;
    flex-shrink: 0;
    text-align: center;
    position: relative;
}

.date-month {
    display: block;
    font-size: 12px;
    color: var(--text-muted);
}

.date-day {
    display: block;
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-date::after {
    content: '';
    position: absolute;
    right: -11px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-dark);
    box-shadow: 0 0 0 3px var(--primary);
}

.timeline-content {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 25px;
    transition: all 0.3s;
}

.timeline-content:hover {
    background: var(--bg-card-hover);
    border-color: rgba(99, 102, 241, 0.3);
}

.news-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.2);
    border-radius: 12px;
    font-size: 12px;
    color: var(--primary-light);
    margin-bottom: 10px;
}

.timeline-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
}

/* ========================================
   Trends Section
   ======================================== */
.trends-section {
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(99, 102, 241, 0.05) 50%, var(--bg-dark) 100%);
}

.trends-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.trend-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all 0.4s;
}

.trend-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: var(--gradient-1);
    opacity: 0;
    transition: opacity 0.4s;
}

.trend-card:hover::before {
    opacity: 0.1;
}

.trend-card:hover {
    transform: translateY(-10px);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 20px 50px rgba(99, 102, 241, 0.2);
}

.trend-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.trend-card h3 {
    font-size: 18px;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
}

.trend-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 20px;
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 16px;
    margin-bottom: 20px;
    color: var(--primary-light);
}

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

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 13px;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1200px) {
    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .trends-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        display: none;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-buttons {
        justify-content: center;
    }

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

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

    .learn-paths {
        grid-template-columns: 1fr;
    }

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

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

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

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

    .section-title {
        font-size: 32px;
    }

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

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

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

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