```css
/* ============================================================
   魅影TV - 热门剧集与电影点播，高清流畅不卡顿
   aoesxi.cn
   ============================================================ */

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

:root {
    --brand-dark: #0b0b0e;
    --brand-surface: #14141c;
    --brand-elevated: #1e1e2a;
    --brand-primary: #e50914;
    --brand-primary-hover: #ff1a2b;
    --brand-primary-glow: rgba(229, 9, 20, 0.35);
    --brand-secondary: #f5c518;
    --brand-secondary-glow: rgba(245, 197, 24, 0.15);
    --text-primary: #f5f5f7;
    --text-secondary: #a1a1b0;
    --text-muted: #6b6b7a;
    --border-subtle: #2a2a3a;
    --border-hover: #3a3a4a;
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-card-hover: 0 16px 40px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 40px rgba(229, 9, 20, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --glass-bg: rgba(20, 20, 28, 0.72);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-blur: 20px;
}

/* 亮色模式 */
body.light-mode {
    --brand-dark: #f8f8fa;
    --brand-surface: #ffffff;
    --brand-elevated: #f0f0f5;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #7a7a8a;
    --border-subtle: #e0e0e8;
    --border-hover: #d0d0d8;
    --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 16px 40px rgba(0, 0, 0, 0.12);
    --glass-bg: rgba(255, 255, 255, 0.78);
    --glass-border: rgba(0, 0, 0, 0.06);
}

/* ---------- 全局基础 ---------- */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--brand-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

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

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

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
}

::selection {
    background-color: var(--brand-primary);
    color: #fff;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--brand-surface);
}

::-webkit-scrollbar-thumb {
    background: var(--brand-elevated);
    border-radius: 4px;
    transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--brand-primary);
}

/* Firefox 滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--brand-elevated) var(--brand-surface);
}

/* ---------- 容器 ---------- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   吸顶导航 - 毛玻璃效果
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    transition: background-color var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.light-mode .site-header {
    background-color: var(--glass-bg);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    color: var(--text-primary);
    opacity: 0.9;
}

.logo svg {
    width: 36px;
    height: 36px;
    transition: transform var(--transition);
}

.logo:hover svg {
    transform: scale(1.08) rotate(-3deg);
}

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

/* 桌面导航 */
.nav-desktop {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-desktop a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
    transition: color var(--transition-fast);
}

.nav-desktop a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    border-radius: 2px;
    transition: width var(--transition);
}

.nav-desktop a:hover {
    color: var(--text-primary);
}

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

/* 头部操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background-color: var(--brand-elevated);
    border-radius: 40px;
    padding: 6px 14px;
    border: 1px solid var(--border-subtle);
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.search-box:focus-within {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px var(--brand-primary-glow);
}

.search-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    width: 160px;
    padding: 4px 0;
    font-family: inherit;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box button {
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    padding: 0 0 0 8px;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
    color: var(--brand-primary);
    transform: scale(1.1);
}

/* 主题切换按钮 */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.theme-toggle:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: rotate(25deg) scale(1.05);
    box-shadow: 0 0 16px var(--brand-primary-glow);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

/* 移动端菜单 */
.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    padding: 20px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-card);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.mobile-nav a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--border-subtle);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav a:hover {
    color: var(--brand-primary);
    padding-left: 8px;
}

.mobile-nav a:last-child {
    border-bottom: none;
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
}

.breadcrumb li + li::before {
    content: '›';
    margin-right: 6px;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--brand-primary);
}

/* ============================================================
   首屏 Hero - 渐变Banner
   ============================================================ */
.hero {
    padding: 48px 0 64px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--brand-dark) 0%, #12121a 40%, #1a0a10 70%, var(--brand-dark) 100%);
}

.light-mode .hero {
    background: linear-gradient(135deg, #f8f8fa 0%, #f0f0f5 40%, #fff5f5 70%, #f8f8fa 100%);
}

/* 径向光晕装饰 */
.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -10%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(229, 9, 20, 0.12) 0%, transparent 65%);
    border-radius: 50%;
    pointer-events: none;
    animation: heroGlow 8s ease-in-out infinite alternate;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(245, 197, 24, 0.06) 0%, transparent 65%);
    border-radius: 50%;
    pointer-events: none;
    animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes heroGlow {
    0% {
        transform: scale(1) translate(0, 0);
        opacity: 0.6;
    }
    100% {
        transform: scale(1.15) translate(-20px, 20px);
        opacity: 1;
    }
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-primary) 50%, var(--brand-primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content h1 em {
    font-style: normal;
    color: var(--brand-primary);
    -webkit-text-fill-color: var(--brand-primary);
    position: relative;
}

.hero-content .hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
    max-width: 520px;
    line-height: 1.7;
}

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

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 40px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand-primary) 0%, #b0060f 100%);
    color: #fff;
    box-shadow: 0 4px 16px var(--brand-primary-glow);
}

.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: left 0.6s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--brand-primary-hover) 0%, var(--brand-primary) 100%);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 12px 32px var(--brand-primary-glow);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border-subtle);
}

.btn-outline:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(229, 9, 20, 0.15);
}

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

.hero-visual svg {
    width: 100%;
    max-width: 520px;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
    animation: floatVisual 6s ease-in-out infinite;
}

@keyframes floatVisual {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-12px);
    }
}

/* ============================================================
   数据统计
   ============================================================ */
.stats-section {
    padding: 40px 0 48px;
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
    background: linear-gradient(180deg, transparent 0%, rgba(229, 9, 20, 0.03) 50%, transparent 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item .stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--brand-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
    transition: transform var(--transition);
}

.stat-item:hover .stat-number {
    transform: scale(1.08);
}

.stat-item .stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 6px;
}

/* ============================================================
   通用区块
   ============================================================ */
.section {
    padding: 72px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 640px;
    margin: 0 auto;
}

.section-header .accent-line {
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    margin: 16px auto 0;
    border-radius: 2px;
}

/* ============================================================
   品牌介绍 & 企业简介
   ============================================================ */
.brand-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.brand-intro-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.brand-intro-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.75;
}

.brand-intro-visual svg {
    width: 100%;
    max-width: 480px;
    height: auto;
    margin: 0 auto;
    transition: transform var(--transition);
}

.brand-intro-visual:hover svg {
    transform: scale(1.03);
}

/* ============================================================
   产品优势卡片 - 圆角 + 毛玻璃
   ============================================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    opacity: 0;
    transition: opacity var(--transition);
}

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

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

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(229, 9, 20, 0.15), rgba(245, 197, 24, 0.08));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--brand-primary);
    transition: transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(-5deg);
    box-shadow: 0 0 24px var(--brand-primary-glow);
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ============================================================
   解决方案
   ============================================================ */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.solution-card {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.solution-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    transition: width var(--transition);
}

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

.solution-card:hover::after {
    width: 100%;
}

.solution-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(245, 197, 24, 0.15), rgba(245, 197, 24, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand-secondary);
    transition: transform var(--transition), box-shadow var(--transition);
}

.solution-card:hover .solution-icon {
    transform: scale(1.1);
    box-shadow: 0 0 20px var(--brand-secondary-glow);
}

.solution-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.solution-content p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ============================================================
   行业应用
   ============================================================ */
.industry-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.industry-tag {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 40px;
    padding: 10px 24px;
    font-size: 0.92rem;
    color: var(--text-secondary);
    transition: all var(--transition);
    cursor: default;
}

.industry-tag:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(229, 9, 20, 0.15);
}

/* ============================================================
   客户案例 & 评价
   ============================================================ */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(180deg, var(--brand-primary), var(--brand-secondary));
    transition: height var(--transition);
}

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

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

.case-card .case-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.case-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.case-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* 客户评价 */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.testimonial-card {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px;
    position: relative;
    transition: all var(--transition);
}

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

.testimonial-card::before {
    content: '"';
    font-size: 4rem;
    line-height: 1;
    color: var(--brand-primary);
    opacity: 0.25;
    position: absolute;
    top: 12px;
    left: 20px;
    font-family: Georgia, serif;
    transition: opacity var(--transition);
}

.testimonial-card:hover::before {
    opacity: 0.4;
}

.testimonial-card blockquote {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    padding-top: 16px;
}

.testimonial-author {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
}

.testimonial-role {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================================
   新闻中心 & 技术文章
   ============================================================ */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.article-card {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.article-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

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

.article-card:hover::after {
    transform: scaleX(1);
}

.article-card .article-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.article-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.4;
    transition: color var(--transition-fast);
}

.article-card:hover h3 {
    color: var(--brand-primary);
}

.article-card .article-summary {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.65;
    flex: 1;
    margin-bottom: 16px;
}

.article-card .read-more {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--brand-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition-fast);
}

.article-card .read-more:hover {
    gap: 8px;
}

/* ============================================================
   行业知识
   ============================================================ */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.knowledge-item {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 22px;
    transition: all var(--transition);
    position: relative;
}

.knowledge-item:hover {
    border-color: var(--brand-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.knowledge-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    transition: color var(--transition-fast);
}

.knowledge-item:hover h4 {
    color: var(--brand-primary);
}

.knowledge-item p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================================
   FAQ - 手风琴
   ============================================================ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item:hover {
    border-color: var(--border-hover);
}

.faq-item.active {
    border-color: var(--brand-primary);
    box-shadow: 0 0 24px rgba(229, 9, 20, 0.1);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    user-select: none;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.faq-question:hover {
    color: var(--brand-primary);
    background-color: rgba(229, 9, 20, 0.03);
}

.faq-question .faq-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition);
    color: var(--brand-primary);
    font-size: 1.2rem;
    font-weight: 300;
}

.faq-item.active .faq-question .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 24px 20px;
}

/* ============================================================
   HowTo - 步骤
   ============================================================ */
.howto-steps {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.howto-step {
    display: flex;
    gap: 24px;
    padding-bottom: 32px;
    position: relative;
}

.howto-step:last-child {
    padding-bottom: 0;
}

.howto-step::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 44px;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--border-subtle), var(--brand-primary), var(--border-subtle));
    opacity: 0.5;
}

.howto-step:last-child::before {
    display: none;
}

.howto-step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-primary), #b0060f);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    position: relative;
    z-index: 1;
    box-shadow: 0 4px 12px var(--brand-primary-glow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.howto-step:hover .howto-step-number {
    transform: scale(1.12);
    box-shadow: 0 6px 20px var(--brand-primary-glow);
}

.howto-step-content h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
    padding-top: 6px;
    transition: color var(--transition-fast);
}

.howto-step:hover .howto-step-content h4 {
    color: var(--brand-primary);
}

.howto-step-content p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ============================================================
   联系我们
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.contact-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    transition: transform var(--transition-fast);
}

.contact-item:hover {
    transform: translateX(4px);
}

.contact-item-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background-color: var(--brand-surface);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-item:hover .contact-item-icon {
    border-color: var(--brand-primary);
    box-shadow: 0 0 16px var(--brand-primary-glow);
}

.contact-item-text strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 2px;
}

.contact-item-text span {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

/* 联系表单 - 毛玻璃 */
.contact-form {
    background-color: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: box-shadow var(--transition);
}

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

.contact-form h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    background-color: var(--brand-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 0.92rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px var(--brand-primary-glow);
    background-color: var(--brand-surface);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-submit {
    width: 100%;
    padding: 14px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--brand-primary) 0%, #b0060f 100%);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.form-submit::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: left 0.6s ease;
}

.form-submit:hover {
    background: linear-gradient(135deg, var(--brand-primary-hover) 0%, var(--brand-primary) 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--brand-primary-glow);
}

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

.form-submit:active {
    transform: translateY(0);
}

/* ============================================================
   网站地图 & 友情链接
   ============================================================ */
.sitemap-links-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.sitemap-column h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 8px;
}

.sitemap-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    border-radius: 2px;
}

.sitemap-column ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sitemap-column ul li a {
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.sitemap-column ul li a:hover {
    color: var(--brand-primary);
    padding-left: 4px;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
    background-color: var(--brand-surface);
    border-top: 1px solid var(--border-subtle);
    padding: 48px 0 32px;
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--brand-primary), var(--brand-secondary), transparent);
    opacity: 0.5;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-top: 16px;
    max-width: 320px;
}

.footer-column h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-column ul li a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-column ul li a:hover {
    color: var(--brand-primary);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: 24px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

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

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

/* ============================================================
   返回顶部
   ============================================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-primary), #b0060f);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: all var(--transition);
    z-index: 900;
    box-shadow: 0 4px 16px var(--brand-primary-glow);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: linear-gradient(135deg, var(--brand-primary-hover), var(--brand-primary));
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 8px 28px var(--brand-primary-glow);
}

.back-to-top:active {
    transform: translateY(-2px) scale(1.02);
}

/* ============================================================
   滚动动画
   ============================================================ */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 延迟动画 */
.fade-in-up:nth-child(1) { transition-delay: 0s; }
.fade-in-up:nth-child(2) { transition-delay: 0.08s; }
.fade-in-up:nth-child(3) { transition-delay: 0.16s; }
.fade-in-up:nth-child(4) { transition-delay: 0.24s; }
.fade-in-up:nth-child(5) { transition-delay: 0.32s; }
.fade-in-up:nth-child(6) { transition-delay: 0.4s; }

/* ============================================================
   响应式 - 平板
   ============================================================ */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

    .hero-visual {
        order: -1;
    }

    .hero-visual svg {
        max-width: 400px;
    }

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

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

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

    .sitemap-links-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

/* ============================================================
   响应式 - 手机
   ============================================================ */
@media (max-width: 768px) {
    .nav-desktop {
        display: none;
    }

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

    .search-box {
        display: none;
    }

    .hero {
        padding: 32px 0 48px;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-content .hero-desc {
        font-size: 1rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .stat-item .stat-number {
        font-size: 1.8rem;
    }

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

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

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

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

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

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

    .brand-intro-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .section {
        padding: 48px 0;
    }

    .section-header h2 {
        font-size: 1.6rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }

    .solution-card {
        flex-direction: column;
        gap: 16px;
    }

    .howto-step {
        gap: 16px;
    }
}

/* ============================================================
   响应式 - 小手机
   ============================================================ */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

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

    .btn {
        width: 100%;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-bottom-links {
        justify-content: center;
    }

    .contact-form {
        padding: 24px 20px;
    }

    .faq-question {
        padding: 14px 16px;
        font-size: 0.92rem;
    }

    .faq-answer {
        padding: 0 16px;
    }

    .faq-item.active .faq-answer {
        padding: 0 16px 16px;
    }
}

/* ============================================================
   减少动画偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .fade-in-up {
        opacity: 1;
        transform: none;
    }
}

/* ============================================================
   打印样式
   ============================================================ */
@media print {
    .site-header,
    .back-to-top,
    .mobile-nav,
    .hero-visual,
    .contact-form {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .section {
        padding: 24px 0;
        break-inside: avoid;
    }
}
```