/* ========================================
   Sora2中文指南 - 高端科技感设计
   ======================================== */

/* CSS变量 - 高级配色方案 */
:root {
    /* 主色调 - 科技紫蓝渐变 */
    --primary-500: #7c3aed;
    --primary-600: #6d28d9;
    --primary-400: #a78bfa;
    
    /* 强调色 */
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --accent-green: #10b981;
    
    /* 深色系 */
    --dark-900: #0a0a0f;
    --dark-800: #12121a;
    --dark-700: #1a1a24;
    --dark-600: #24242e;
    
    /* 文字色 */
    --text-white: #ffffff;
    --text-gray-100: #f1f5f9;
    --text-gray-300: #cbd5e1;
    --text-gray-400: #94a3b8;
    --text-gray-500: #64748b;
    --text-dark: #0f172a;
    
    /* 背景色 */
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.03);
    
    /* 渐变 */
    --gradient-hero: linear-gradient(135deg, #0a0a0f 0%, #1a0a2e 50%, #0f172a 100%);
    --gradient-primary: linear-gradient(135deg, #7c3aed 0%, #a855f7 50%, #ec4899 100%);
    --gradient-glow: linear-gradient(135deg, rgba(124, 58, 237, 0.5) 0%, rgba(236, 72, 153, 0.5) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    --gradient-text: linear-gradient(135deg, #a78bfa 0%, #f472b6 50%, #fb7185 100%);
    
    /* 边框 */
    --border-light: rgba(255, 255, 255, 0.08);
    --border-white: rgba(255, 255, 255, 0.12);
    --border-gray: #e2e8f0;
    
    /* 阴影 */
    --shadow-glow: 0 0 60px rgba(124, 58, 237, 0.3);
    --shadow-card: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 30px 60px rgba(0, 0, 0, 0.2);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   导航栏 - 毛玻璃效果
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(10, 10, 15, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-white);
}

.logo-img {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    object-fit: cover;
    border: 2px solid var(--border-white);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-menu a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-gray-300);
    position: relative;
    padding: 8px 0;
}

.nav-menu a:hover {
    color: var(--text-white);
}

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

.nav-menu a:hover::after {
    width: 100%;
}

.nav-btn {
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-full);
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.4);
}

.nav-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.5);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-white);
    transition: var(--transition);
    border-radius: 2px;
}

/* ========================================
   Hero区域 - 震撼视觉效果
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 120px 24px 100px;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

/* 动态背景效果 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(124, 58, 237, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(236, 72, 153, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
    animation: heroGlow 15s ease-in-out infinite;
    pointer-events: none;
}

@keyframes heroGlow {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, 2%) rotate(1deg); }
    66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

/* 网格背景 */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: rgba(124, 58, 237, 0.15);
    border: 1px solid rgba(124, 58, 237, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-400);
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-tag::before {
    content: '✨';
}

.hero h1 {
    font-size: clamp(2.75rem, 7vw, 4.5rem);
    font-weight: 800;
    color: var(--text-white);
    line-height: 1.15;
    margin-bottom: 28px;
    letter-spacing: -0.03em;
}

.hero h1::after {
    content: '';
    display: block;
    width: 120px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 32px auto 0;
    border-radius: 2px;
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-gray-300);
    line-height: 1.8;
    margin-bottom: 48px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin-bottom: 56px;
    padding: 32px 48px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    backdrop-filter: blur(10px);
}

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

.stat-number {
    display: block;
    font-size: 2.75rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-gray-400);
    margin-top: 6px;
    font-weight: 500;
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 18px 36px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: 0 8px 32px rgba(124, 58, 237, 0.4);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition-slow);
}

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

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(124, 58, 237, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-4px);
}

.hero-badge {
    margin-top: 80px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.badge-text {
    display: block;
    font-size: 0.85rem;
    color: var(--text-gray-500);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.badge-logos {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.badge-logos span {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-gray-500);
    letter-spacing: 0.05em;
    opacity: 0.6;
    transition: var(--transition);
}

.badge-logos span:hover {
    opacity: 1;
    color: var(--text-gray-300);
}

/* ========================================
   通用Section样式
   ======================================== */
.section {
    padding: 120px 0;
    position: relative;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    border: 1px solid rgba(124, 58, 237, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-500);
    margin-bottom: 20px;
}

.section h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.section-intro {
    font-size: 1.15rem;
    color: var(--text-gray-500);
    max-width: 680px;
    margin: 0 auto 72px;
    line-height: 1.8;
}

/* ========================================
   关于Sora2 - 深色主题
   ======================================== */
.about-section {
    background: var(--dark-900);
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 30% 0%, rgba(124, 58, 237, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 100%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.about-section .container {
    text-align: center;
    position: relative;
    z-index: 1;
}

.about-section .section-tag {
    background: rgba(124, 58, 237, 0.2);
    border-color: rgba(124, 58, 237, 0.4);
    color: var(--primary-400);
}

.about-section h2 {
    color: var(--text-white);
}

.about-section .section-intro {
    color: var(--text-gray-400);
}

.about-main {
    max-width: 900px;
    margin: 0 auto 80px;
    text-align: left;
    padding: 48px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    backdrop-filter: blur(10px);
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 24px;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-gray-300);
    margin-bottom: 20px;
    line-height: 1.9;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.about-card {
    background: var(--gradient-card);
    padding: 40px 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow-glow);
}

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

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 24px;
    display: inline-block;
}

.about-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 10px;
}

.about-card h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-400);
    margin-bottom: 18px;
}

.about-card p {
    font-size: 0.95rem;
    color: var(--text-gray-400);
    line-height: 1.8;
}

/* ========================================
   功能区域 - 白色主题
   ======================================== */
.features-section {
    background: var(--bg-light);
}

.features-section .container {
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    text-align: left;
}

.feature-card {
    background: var(--bg-white);
    padding: 48px 40px;
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-gray);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-card:hover::before {
    height: 100%;
}

.feature-number {
    font-size: 4rem;
    font-weight: 900;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 20px;
}

.feature-icon {
    font-size: 2.75rem;
    margin-bottom: 20px;
    display: block;
    line-height: 1;
}

.feature-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.feature-card h4 {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--primary-500);
    margin-bottom: 20px;
}

.feature-card > p {
    font-size: 0.95rem;
    color: var(--text-gray-500);
    line-height: 1.85;
    margin-bottom: 24px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 500;
}

.feature-list li::before {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
    color: var(--accent-green);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

/* ========================================
   能力区域 - 深色主题
   ======================================== */
.capabilities-section {
    background: var(--dark-800);
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

.capabilities-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.capabilities-section .container {
    text-align: center;
    position: relative;
    z-index: 1;
}

.capabilities-section .section-tag {
    background: rgba(124, 58, 237, 0.2);
    border-color: rgba(124, 58, 237, 0.4);
    color: var(--primary-400);
}

.capabilities-section h2 {
    color: var(--text-white);
}

.capabilities-section .section-intro {
    color: var(--text-gray-400);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    text-align: left;
}

.capability-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 36px 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
}

.capability-item::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    padding: 1px;
    background: var(--gradient-primary);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: var(--transition);
}

.capability-item:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.05);
}

.capability-item:hover::after {
    opacity: 1;
}

.capability-item h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 10px;
}

.capability-item h4 {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-400);
    margin-bottom: 16px;
}

.capability-item p {
    font-size: 0.92rem;
    color: var(--text-gray-400);
    line-height: 1.8;
}

/* ========================================
   技术优势区域 - 白色主题
   ======================================== */
.tech-section {
    background: var(--bg-white);
}

.tech-section .container {
    text-align: center;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    text-align: left;
}

.tech-card {
    background: var(--bg-light);
    padding: 44px 36px;
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-gray);
    transition: var(--transition);
    position: relative;
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 24px;
    right: 24px;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    opacity: 0.1;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.tech-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(124, 58, 237, 0.2);
}

.tech-card:hover::before {
    transform: scale(1.5);
    opacity: 0.15;
}

.tech-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.tech-card h4 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-500);
    margin-bottom: 18px;
}

.tech-card p {
    font-size: 0.95rem;
    color: var(--text-gray-500);
    line-height: 1.85;
}

/* ========================================
   使用指南 - 深色主题
   ======================================== */
.guide-section {
    background: var(--dark-900);
    color: var(--text-white);
    position: relative;
}

.guide-section::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 400px;
    background: linear-gradient(to top, rgba(124, 58, 237, 0.05), transparent);
    pointer-events: none;
}

.guide-section .container {
    text-align: center;
    position: relative;
    z-index: 1;
}

.guide-section .section-tag {
    background: rgba(124, 58, 237, 0.2);
    border-color: rgba(124, 58, 237, 0.4);
    color: var(--primary-400);
}

.guide-section h2 {
    color: var(--text-white);
}

.guide-section .section-intro {
    color: var(--text-gray-400);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    text-align: left;
}

.step-card {
    background: rgba(255, 255, 255, 0.03);
    padding: 40px 28px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    background: rgba(255, 255, 255, 0.06);
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    color: var(--text-white);
    font-size: 1.35rem;
    font-weight: 800;
    border-radius: var(--radius-lg);
    margin-bottom: 28px;
    box-shadow: 0 8px 24px rgba(124, 58, 237, 0.4);
}

.step-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 10px;
}

.step-card h4 {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-400);
    margin-bottom: 16px;
}

.step-card p {
    font-size: 0.9rem;
    color: var(--text-gray-400);
    line-height: 1.8;
}

/* ========================================
   适用人群 - 白色主题
   ======================================== */
.audience-section {
    background: var(--bg-light);
}

.audience-section .container {
    text-align: center;
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    text-align: left;
}

.audience-card {
    background: var(--bg-white);
    padding: 40px 28px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-gray);
    transition: var(--transition);
    text-align: center;
}

.audience-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.audience-icon {
    font-size: 3.5rem;
    margin-bottom: 24px;
    display: block;
}

.audience-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.audience-card h4 {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-500);
    margin-bottom: 16px;
}

.audience-card p {
    font-size: 0.9rem;
    color: var(--text-gray-500);
    line-height: 1.75;
    text-align: left;
}

/* ========================================
   FAQ区域 - 白色主题
   ======================================== */
.faq-section {
    background: var(--bg-white);
}

.faq-section .container {
    text-align: center;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    text-align: left;
}

.faq-item {
    background: var(--bg-light);
    padding: 36px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-gray);
    transition: var(--transition);
}

.faq-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(124, 58, 237, 0.2);
}

.faq-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.faq-item h4 {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary-500);
    margin-bottom: 14px;
}

.faq-item p {
    font-size: 0.92rem;
    color: var(--text-gray-500);
    line-height: 1.8;
}

/* ========================================
   CTA区域 - 震撼渐变
   ======================================== */
.cta-section {
    background: var(--gradient-hero);
    text-align: center;
    padding: 120px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 25% 50%, rgba(124, 58, 237, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 75% 50%, rgba(236, 72, 153, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

.cta-section .container {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 24px;
}

.cta-section p {
    font-size: 1.1rem;
    color: var(--text-gray-300);
    max-width: 700px;
    margin: 0 auto 48px;
    line-height: 1.85;
}

.cta-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   页脚 - 深色主题
   ======================================== */
.footer {
    background: var(--dark-900);
    padding: 100px 0 48px;
    color: var(--text-gray-300);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2.5fr;
    gap: 80px;
    margin-bottom: 72px;
}

.footer-brand {
    max-width: 340px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--text-white);
    margin-bottom: 24px;
}

.footer-logo .logo-img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-white);
}

.footer-brand p {
    font-size: 0.95rem;
    color: var(--text-gray-400);
    line-height: 1.85;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 28px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-col a {
    font-size: 0.9rem;
    color: var(--text-gray-400);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.footer-col a:hover {
    color: var(--primary-400);
    transform: translateX(4px);
}

.footer-bottom {
    padding-top: 48px;
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-gray-500);
}

/* ========================================
   模拟创作界面
   ======================================== */
.demo-interface {
    max-width: 720px;
    margin: 0 auto 48px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    backdrop-filter: blur(20px);
    position: relative;
    z-index: 2;
}

.demo-preview {
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.demo-preview-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

.demo-video-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    background: linear-gradient(
        135deg,
        rgba(124, 58, 237, 0.3) 0%,
        rgba(6, 182, 212, 0.3) 25%,
        rgba(236, 72, 153, 0.3) 50%,
        rgba(16, 185, 129, 0.3) 75%,
        rgba(124, 58, 237, 0.3) 100%
    );
    background-size: 400% 400%;
    animation: gradientShift 8s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-play-btn {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
    cursor: pointer;
}

.demo-play-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.1);
}

.demo-label {
    font-size: 0.8rem;
    color: var(--text-gray-500);
}

.demo-input-bar {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    border-top: 1px solid var(--border-light);
    gap: 12px;
}

.demo-input-text {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-gray-500);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.demo-generate-btn {
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.85rem;
    border-radius: var(--radius-full);
    white-space: nowrap;
    box-shadow: 0 4px 16px rgba(124, 58, 237, 0.4);
    transition: var(--transition);
}

.demo-generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(124, 58, 237, 0.5);
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* 流程和合作伙伴图片 */
.workflow-img-wrap,
.partners-img-wrap {
    max-width: 800px;
    margin: 0 auto 56px;
}

.workflow-img,
.partners-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-gray);
    transition: var(--transition);
}

.partners-img-wrap {
    margin-bottom: 56px;
}

.about-section .workflow-img,
.about-section .partners-img {
    border-color: var(--border-light);
}

.workflow-img:hover,
.partners-img:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   作品展示 - 滚动条
   ======================================== */
.showcase-section {
    background: var(--dark-900);
    color: var(--text-white);
    overflow: hidden;
    position: relative;
    padding-bottom: 100px;
}

.showcase-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(124, 58, 237, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.showcase-section .container {
    text-align: center;
    position: relative;
    z-index: 1;
}

.showcase-section .section-tag {
    background: rgba(124, 58, 237, 0.2);
    border-color: rgba(124, 58, 237, 0.4);
    color: var(--primary-400);
}

.showcase-section h2 {
    color: var(--text-white);
}

.showcase-strip {
    margin-top: 56px;
    overflow: hidden;
    width: 100%;
    position: relative;
    z-index: 1;
}

.showcase-strip::before,
.showcase-strip::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 120px;
    z-index: 2;
    pointer-events: none;
}

.showcase-strip::before {
    left: 0;
    background: linear-gradient(to right, var(--dark-900), transparent);
}

.showcase-strip::after {
    right: 0;
    background: linear-gradient(to left, var(--dark-900), transparent);
}

.showcase-track {
    display: flex;
    gap: 24px;
    animation: showcaseScroll 35s linear infinite;
    width: max-content;
}

.showcase-item {
    flex-shrink: 0;
    width: 280px;
    height: 180px;
    border-radius: var(--radius-xl);
    background: linear-gradient(
        135deg,
        hsl(var(--hue), 60%, 12%) 0%,
        hsl(var(--hue), 70%, 30%) 50%,
        hsl(calc(var(--hue) + 40), 60%, 20%) 100%
    );
    display: flex;
    align-items: flex-end;
    padding: 18px 22px;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition);
}

.showcase-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent 60%);
}

.showcase-item::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.2);
    opacity: 0;
    transition: var(--transition);
}

.showcase-item:hover::after {
    opacity: 1;
}

.showcase-item span {
    position: relative;
    z-index: 1;
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.9rem;
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .about-grid,
    .capabilities-grid,
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .guide-steps,
    .audience-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 56px;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-stats {
        gap: 40px;
        padding: 28px 36px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--dark-900);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        border-bottom: 1px solid var(--border-light);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu a {
        padding: 14px 20px;
        border-radius: var(--radius-md);
    }

    .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.05);
    }

    .nav-menu a::after {
        display: none;
    }

    .nav-btn {
        display: none;
    }

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

    .hero {
        padding: 100px 20px 80px;
        min-height: auto;
    }

    .hero h1 {
        font-size: 2.25rem;
    }
    
    .hero h1::after {
        margin-top: 24px;
        width: 80px;
    }

    .hero-desc {
        font-size: 1.05rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
        padding: 32px;
    }

    .stat-number {
        font-size: 2.25rem;
    }

    .hero-btns {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .section {
        padding: 80px 0;
    }

    .section h2 {
        font-size: 1.75rem;
    }

    .section-intro {
        font-size: 1rem;
        margin-bottom: 48px;
    }

    .about-main {
        padding: 32px 24px;
    }

    .about-grid,
    .capabilities-grid,
    .tech-grid,
    .guide-steps,
    .audience-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }

    .about-card,
    .feature-card,
    .capability-item,
    .tech-card,
    .step-card,
    .audience-card,
    .faq-item {
        padding: 32px 24px;
    }

    .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }

    .cta-section {
        padding: 80px 0;
    }

    .cta-btns {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-badge {
        margin-top: 56px;
    }
    
    .badge-logos {
        gap: 24px;
    }

    .demo-interface {
        margin: 0 auto 32px;
    }

    .demo-input-text {
        font-size: 0.8rem;
    }

    .demo-generate-btn {
        padding: 8px 16px;
        font-size: 0.8rem;
    }

    .showcase-item {
        width: 220px;
        height: 140px;
    }

    .showcase-strip::before,
    .showcase-strip::after {
        width: 40px;
    }

    .showcase-section {
        padding-bottom: 60px;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .nav-container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 90px 16px 60px;
    }
    
    .hero h1 {
        font-size: 1.85rem;
    }

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

    .badge-logos {
        gap: 16px;
    }
    
    .badge-logos span {
        font-size: 0.85rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.about-card,
.feature-card,
.capability-item,
.tech-card,
.step-card,
.audience-card,
.faq-item {
    animation: fadeInUp 0.6s ease-out forwards;
}