```css
/* ============================================================
   棒棒TV - 高清影视搜索播放，最新电影剧集随心选
   Website: 51youle.cn
   Author: 棒棒TV Content Team
   Style: 渐变Banner + 圆角卡片 + 毛玻璃 + 响应式 + 暗色模式
   ============================================================ */

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

:root {
    /* 色彩体系 */
    --bg: #f6f8fb;
    --bg-soft: #eef2f7;
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.72);
    --surface-glass-strong: rgba(255, 255, 255, 0.92);
    --text: #16202e;
    --text-light: #5a6b80;
    --text-muted: #8a99ab;

    /* 品牌主色 */
    --primary: #0a1a2f;
    --primary-light: #1e3a5f;
    --primary-soft: #2c5a8f;
    --accent: #e63946;
    --accent-hover: #c1121f;
    --accent-soft: #ff6b76;
    --gold: #fca311;
    --gold-soft: #ffc04d;

    /* 线条与阴影 */
    --border: #e3e9f1;
    --border-strong: #cfd9e6;
    --shadow-sm: 0 2px 8px rgba(10, 26, 47, 0.06);
    --shadow: 0 8px 28px rgba(10, 26, 47, 0.09);
    --shadow-lg: 0 18px 48px rgba(10, 26, 47, 0.16);
    --shadow-accent: 0 10px 28px rgba(230, 57, 70, 0.32);

    /* 尺寸与圆角 */
    --radius-sm: 8px;
    --radius: 16px;
    --radius-lg: 24px;
    --radius-pill: 999px;
    --max-width: 1200px;
    --header-h: 68px;

    /* 动效 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.18s ease;
    --transition-slow: all 0.55s cubic-bezier(0.22, 1, 0.36, 1);

    /* 渐变 */
    --grad-hero: linear-gradient(135deg, #0a1a2f 0%, #16325c 45%, #1e3a5f 100%);
    --grad-accent: linear-gradient(135deg, #e63946 0%, #ff6b76 100%);
    --grad-gold: linear-gradient(135deg, #fca311 0%, #ffc04d 100%);
    --grad-card-icon: linear-gradient(135deg, #0a1a2f 0%, #2c5a8f 100%);
    --grad-thumb: linear-gradient(135deg, #0a1a2f 0%, #1e3a5f 100%);

    /* 毛玻璃 */
    --glass-blur: saturate(180%) blur(18px);
}

/* ---------- 暗色模式 ---------- */
[data-theme="dark"] {
    --bg: #0b1220;
    --bg-soft: #101a2c;
    --surface: #16233a;
    --surface-glass: rgba(22, 35, 58, 0.72);
    --surface-glass-strong: rgba(22, 35, 58, 0.92);
    --text: #e6edf6;
    --text-light: #a3b3c8;
    --text-muted: #7387a0;

    --primary: #e6edf6;
    --primary-light: #c3d3e6;
    --primary-soft: #7fa7d1;
    --accent: #ff5c68;
    --accent-hover: #ff7f89;
    --accent-soft: #ff8f97;
    --gold: #ffc04d;
    --gold-soft: #ffd580;

    --border: #26364f;
    --border-strong: #34496a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
    --shadow-accent: 0 10px 28px rgba(255, 92, 104, 0.3);

    --grad-hero: linear-gradient(135deg, #060c16 0%, #0f1e36 50%, #16233a 100%);
    --grad-card-icon: linear-gradient(135deg, #1a2c47 0%, #2c5a8f 100%);
    --grad-thumb: linear-gradient(135deg, #0f1e36 0%, #1a2c47 100%);
}

/* ---------- 文档基础 ---------- */
html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 20px);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.8;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background 0.35s ease, color 0.35s ease;
    overflow-x: hidden;
}

/* 背景柔和光晕 */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(600px 400px at 8% 0%, rgba(230, 57, 70, 0.06), transparent 60%),
        radial-gradient(700px 500px at 100% 10%, rgba(30, 58, 95, 0.08), transparent 60%);
}

[data-theme="dark"] body::before {
    background:
        radial-gradient(600px 400px at 8% 0%, rgba(255, 92, 104, 0.08), transparent 60%),
        radial-gradient(700px 500px at 100% 10%, rgba(44, 90, 143, 0.16), transparent 60%);
}

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

a:hover,
a:focus-visible {
    color: var(--accent-hover);
}

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
}

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

/* 焦点可见性 */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* ---------- 布局容器 ---------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================================
   顶部导航（毛玻璃 + 吸顶）
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-h);
    display: flex;
    align-items: center;
    background: var(--surface-glass);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow);
    background: var(--surface-glass-strong);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 16px;
}

/* Logo */
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.3px;
    color: var(--primary);
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.logo svg {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.logo:hover svg {
    transform: rotate(-8deg) scale(1.08);
}

/* 主导航 */
.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-links a {
    position: relative;
    display: inline-block;
    padding: 8px 14px;
    border-radius: var(--radius-pill);
    color: var(--text-light);
    font-size: 0.94rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 2px;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--accent);
    background: var(--bg-soft);
}

.nav-links a:hover::after,
.nav-links a:focus-visible::after {
    width: 22px;
}

/* 头部操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* 搜索框（毛玻璃） */
.search-box {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 6px 4px 14px;
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.12);
    background: var(--surface);
}

.search-box input {
    width: 150px;
    padding: 6px 0;
    border: none;
    background: transparent;
    outline: none;
    color: var(--text);
    font-size: 0.9rem;
    transition: width 0.3s ease;
}

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

.search-box input:focus {
    width: 190px;
}

.search-box button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition-fast);
}

.search-box button:hover {
    background: var(--accent);
    color: #fff;
}

/* 主题 / 移动切换按钮 */
.theme-toggle,
.mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg-soft);
    color: var(--text);
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

.theme-toggle:hover,
.mobile-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: rotate(15deg) scale(1.05);
}

.theme-toggle:active,
.mobile-toggle:active {
    transform: scale(0.94);
}

.mobile-toggle {
    display: none;
}

/* 移动菜单（毛玻璃抽屉） */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 999;
    flex-direction: column;
    gap: 6px;
    padding: 20px;
    overflow-y: auto;
    background: var(--surface-glass-strong);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    animation: menuFade 0.28s ease;
}

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

@keyframes menuFade {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-menu a {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border-bottom: 1px solid var(--border);
    color: var(--text);
    font-size: 1.02rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.mobile-menu a:hover {
    background: var(--bg-soft);
    color: var(--accent);
    padding-left: 24px;
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
    padding: 18px 0 6px;
    font-size: 0.85rem;
    color: var(--text-light);
}

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

.breadcrumb li {
    display: inline-flex;
    align-items: center;
}

.breadcrumb li + li::before {
    content: "/";
    margin-right: 6px;
    color: var(--border-strong);
}

.breadcrumb a {
    color: var(--text-light);
}

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

.breadcrumb [aria-current="page"] {
    color: var(--text);
    font-weight: 600;
}

/* ============================================================
   Hero 渐变 Banner
   ============================================================ */
.hero {
    position: relative;
    padding: 72px 0 96px;
    overflow: hidden;
    color: #fff;
    background: var(--grad-hero);
    isolation: isolate;
}

/* 装饰光斑 */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(520px 320px at 82% 18%, rgba(252, 163, 17, 0.18), transparent 65%),
        radial-gradient(600px 400px at 12% 90%, rgba(230, 57, 70, 0.22), transparent 65%),
        radial-gradient(400px 300px at 55% 0%, rgba(120, 180, 255, 0.14), transparent 70%);
    animation: heroGlow 14s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% {
        transform: scale(1) translateY(0);
        opacity: 0.9;
    }
    100% {
        transform: scale(1.08) translateY(-10px);
        opacity: 1;
    }
}

/* 底部弧形过渡 */
.hero::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -1px;
    height: 70px;
    background: var(--bg);
    clip-path: polygon(0 100%, 100% 100%, 100% 0);
    transition: background 0.35s ease;
}

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
}

.hero h1 {
    font-size: clamp(1.9rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: 0.3px;
    margin-bottom: 20px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}

.hero h1 span {
    background: var(--grad-gold);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.hero p {
    max-width: 560px;
    margin-bottom: 30px;
    font-size: 1.06rem;
    line-height: 1.85;
    color: rgba(255, 255, 255, 0.86);
}

/* CTA 按钮 */
.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    color: #fff;
    background: var(--grad-accent);
    box-shadow: var(--shadow-accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 14px 34px rgba(230, 57, 70, 0.45);
}

.btn-primary:active {
    transform: translateY(-1px) scale(0.98);
}

.btn-outline {
    color: #fff;
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid rgba(255, 255, 255, 0.42);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.btn-outline:hover,
.btn-outline:focus-visible {
    color: #fff;
    background: rgba(255, 255, 255, 0.16);
    border-color: #fff;
    transform: translateY(-3px);
}

/* 轮播圆点 */
.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 28px;
}

.hero .carousel-dots {
    justify-content: flex-start;
}

.carousel-dots button {
    width: 10px;
    height: 10px;
    padding: 0;
    border: none;
    border-radius: var(--radius-pill);
    background: rgba(255, 255, 255, 0.38);
    cursor: pointer;
    transition: var(--transition);
}

.carousel-dots button:hover {
    background: rgba(255, 255, 255, 0.7);
}

.carousel-dots button.active {
    width: 28px;
    background: var(--gold);
    box-shadow: 0 0 12px rgba(252, 163, 17, 0.6);
}

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

.hero-visual svg {
    width: 100%;
    max-width: 480px;
    filter: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.38));
    animation: floatY 6s ease-in-out infinite;
}

@keyframes floatY {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-14px);
    }
}

/* ============================================================
   数字统计
   ============================================================ */
.stats {
    position: relative;
    z-index: 3;
    padding: 46px 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    transition: background 0.35s ease;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-num {
    font-size: clamp(1.8rem, 3.4vw, 2.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.5px;
    background: var(--grad-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.stat-label {
    margin-top: 8px;
    font-size: 0.92rem;
    color: var(--text-light);
    letter-spacing: 0.3px;
}

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

.section-alt {
    background: var(--bg-soft);
    transition: background 0.35s ease;
}

.section-head {
    max-width: 760px;
    margin: 0 auto 48px;
    text-align: center;
}

.section-head h2 {
    margin-bottom: 14px;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: 0.2px;
    color: var(--primary);
}

.section-head p {
    font-size: 1.02rem;
    color: var(--text-light);
}

.divider {
    width: 56px;
    height: 4px;
    margin: 0 auto 22px;
    border-radius: 2px;
    background: var(--grad-accent);
}

/* ============================================================
   卡片网格（圆角 + 毛玻璃 + hover）
   ============================================================ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.card {
    position: relative;
    padding: 30px 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition-slow);
}

/* 顶部渐变描边 */
.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--grad-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(230, 57, 70, 0.35);
    box-shadow: var(--shadow-lg);
}

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

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    margin-bottom: 20px;
    border-radius: 14px;
    background: var(--grad-card-icon);
    box-shadow: 0 8px 20px rgba(10, 26, 47, 0.22);
    transition: var(--transition);
}

.card:hover .card-icon {
    transform: rotate(-6deg) scale(1.08);
    box-shadow: 0 12px 26px rgba(230, 57, 70, 0.28);
}

.card-icon svg {
    width: 28px;
    height: 28px;
    stroke: #fff;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.card h3 {
    margin-bottom: 10px;
    font-size: 1.16rem;
    font-weight: 700;
    line-height: 1.5;
    color: var(--primary);
    transition: color 0.3s ease;
}

.card:hover h3 {
    color: var(--accent);
}

.card p {
    font-size: 0.94rem;
    line-height: 1.8;
    color: var(--text-light);
}

/* ============================================================
   文章列表
   ============================================================ */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.article-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
}

.article-card:hover {
    transform: translateY(-8px);
    border-color: rgba(230, 57, 70, 0.35);
    box-shadow: var(--shadow-lg);
}

.article-thumb {
    position: relative;
    height: 168px;
    overflow: hidden;
    background: var(--grad-thumb);
}

.article-thumb svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.article-card:hover .article-thumb svg {
    transform: scale(1.08);
}

/* 缩略图遮罩渐变 */
.article-thumb::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 55%, rgba(10, 26, 47, 0.35) 100%);
    pointer-events: none;
}

.article-body {
    display: flex;
    flex: 1;
    flex-direction: column;
    padding: 24px 22px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 10px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-meta span {
    position: relative;
    padding-left: 12px;
}

.article-meta span::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--accent);
    transform: translateY(-50%);
}

.article-body h3 {
    margin-bottom: 10px;
    font-size: 1.08rem;
    font-weight: 700;
    line-height: 1.55;
    color: var(--primary);
    transition: color 0.3s ease;
}

.article-card:hover .article-body h3 {
    color: var(--accent);
}

.article-body p {
    flex: 1;
    margin-bottom: 16px;
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--text-light);
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    transition: var(--transition-fast);
}

.read-more:hover {
    gap: 10px;
    color: var(--accent-hover);
}

/* ============================================================
   FAQ 手风琴
   ============================================================ */
.faq-list {
    max-width: 880px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
}

.faq-item.open {
    border-color: rgba(230, 57, 70, 0.4);
    box-shadow: var(--shadow);
}

.faq-q {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    padding: 18px 22px;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.6;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.faq-q:hover {
    color: var(--accent);
}

.faq-q .arrow {
    flex-shrink: 0;
    font-size: 0.72rem;
    color: var(--accent);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.faq-item.open .faq-q .arrow {
    transform: rotate(180deg);
}

.faq-a {
    max-height: 0;
    padding: 0 22px;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.22, 1, 0.36, 1),
        padding 0.35s ease;
}

.faq-item.open .faq-a {
    max-height: 640px;
    padding: 0 22px 20px;
}

.faq-a p {
    font-size: 0.95rem;
    line-height: 1.85;
    color: var(--text-light);
}

/* ============================================================
   HowTo 步骤
   ============================================================ */
.howto-steps {
    display: grid;
    gap: 18px;
    max-width: 880px;
    margin: 0 auto;
}

.step {
    position: relative;
    display: flex;
    gap: 22px;
    padding: 26px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
}

.step:hover {
    transform: translateX(6px);
    border-color: rgba(230, 57, 70, 0.35);
    box-shadow: var(--shadow);
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--grad-accent);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    box-shadow: var(--shadow-accent);
    transition: var(--transition);
}

.step:hover .step-num {
    transform: scale(1.08) rotate(-6deg);
}

.step h3 {
    margin-bottom: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
}

.step p {
    font-size: 0.95rem;
    line-height: 1.85;
    color: var(--text-light);
}

/* ============================================================
   联系信息
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.contact-card {
    padding: 30px 24px;
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
}

.contact-card:hover {
    transform: translateY(-6px);
    border-color: rgba(230, 57, 70, 0.35);
    box-shadow: var(--shadow-lg);
}

.contact-card svg {
    width: 38px;
    height: 38px;
    margin: 0 auto 14px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: var(--transition);
}

.contact-card:hover svg {
    transform: scale(1.12) translateY(-2px);
}

.contact-card h3 {
    margin-bottom: 8px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
}

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

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
    position: relative;
    padding: 60px 0 26px;
    background: var(--primary);
    color: #cbd5e1;
    overflow: hidden;
}

[data-theme="dark"] .site-footer {
    background: #060c16;
}

.site-footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--grad-accent);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 42px;
}

.footer-brand .logo {
    color: #fff;
    margin-bottom: 14px;
}

.footer-brand .logo:hover {
    color: var(--gold);
}

.footer-brand p {
    max-width: 380px;
    font-size: 0.9rem;
    line-height: 1.85;
    color: rgba(203, 213, 225, 0.82);
}

.footer-col h4 {
    margin-bottom: 18px;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 11px;
}

.footer-col a {
    position: relative;
    display: inline-block;
    font-size: 0.9rem;
    color: rgba(203, 213, 225, 0.82);
    transition: var(--transition-fast);
}

.footer-col a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 1px;
    background: var(--gold);
    transition: width 0.3s ease;
}

.footer-col a:hover {
    color: var(--gold);
}

.footer-col a:hover::after {
    width: 100%;
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.84rem;
    color: rgba(203, 213, 225, 0.7);
}

.footer-bottom a {
    color: rgba(203, 213, 225, 0.82);
}

.footer-bottom a:hover {
    color: var(--gold);
}

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
    position: fixed;
    right: 28px;
    bottom: 28px;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--grad-accent);
    color: #fff;
    cursor: pointer;
    box-shadow: var(--shadow-accent);
    opacity: 0;
    visibility: hidden;
    transform: translateY(24px) scale(0.9);
    transition: var(--transition);
}

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

.back-top:hover {
    transform: translateY(-4px) scale(1.06);
    box-shadow: 0 16px 36px rgba(230, 57, 70, 0.5);
}

.back-top:active {
    transform: translateY(-1px) scale(0.98);
}

/* ============================================================
   滚动动画
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 卡片网格错峰入场 */
.card-grid .reveal:nth-child(2),
.article-list .reveal:nth-child(2),
.howto-steps .reveal:nth-child(2) {
    transition-delay: 0.06s;
}

.card-grid .reveal:nth-child(3),
.article-list .reveal:nth-child(3),
.howto-steps .reveal:nth-child(3) {
    transition-delay: 0.12s;
}

.card-grid .reveal:nth-child(4),
.article-list .reveal:nth-child(4),
.howto-steps .reveal:nth-child(4) {
    transition-delay: 0.18s;
}

.card-grid .reveal:nth-child(5),
.article-list .reveal:nth-child(5),
.howto-steps .reveal:nth-child(5) {
    transition-delay: 0.24s;
}

.card-grid .reveal:nth-child(6),
.article-list .reveal:nth-child(6),
.howto-steps .reveal:nth-child(6) {
    transition-delay: 0.3s;
}

/* ============================================================
   响应式 - 大屏优化
   ============================================================ */
@media (min-width: 1400px) {
    :root {
        --max-width: 1280px;
    }
}

/* ============================================================
   响应式 - 平板
   ============================================================ */
@media (max-width: 1024px) {
    .search-box input {
        width: 120px;
    }

    .search-box input:focus {
        width: 150px;
    }

    .nav-links a {
        padding: 8px 10px;
        font-size: 0.9rem;
    }
}

@media (max-width: 960px) {
    .hero {
        padding: 56px 0 84px;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
        text-align: center;
    }

    .hero p {
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero .carousel-dots {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-visual svg {
        max-width: 420px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px 20px;
    }

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

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* ============================================================
   响应式 - 手机
   ============================================================ */
@media (max-width: 768px) {
    :root {
        --header-h: 60px;
    }

    .container {
        padding: 0 18px;
    }

    .nav-links {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .search-box {
        display: none;
    }

    .logo {
        font-size: 1.12rem;
    }

    .logo svg {
        width: 32px;
        height: 32px;
    }

    .hero {
        padding: 44px 0 68px;
    }

    .hero h1 {
        font-size: 1.72rem;
    }

    .hero p {
        font-size: 0.98rem;
    }

    .hero-visual svg {
        max-width: 340px;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.94rem;
    }

    .section {
        padding: 48px 0;
    }

    .section-head {
        margin-bottom: 32px;
    }

    .section-head h2 {
        font-size: 1.42rem;
    }

    .section-head p {
        font-size: 0.95rem;
    }

    .card {
        padding: 24px 22px;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .article-list {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .article-thumb {
        height: 150px;
    }

    .step {
        flex-direction: column;
        gap: 14px;
        padding: 22px;
    }

    .step:hover {
        transform: translateY(-4px);
    }

    .step-num {
        width: 42px;
        height: 42px;
        font-size: 1rem;
    }

    .faq-q {
        padding: 16px 18px;
        font-size: 0.95rem;
    }

    .faq-a {
        padding: 0 18px;
    }

    .faq-item.open .faq-a {
        padding: 0 18px 18px;
    }

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

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

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .back-top {
        right: 18px;
        bottom: 18px;
        width: 44px;
        height: 44px;
    }

    .mobile-menu {
        padding: 16px;
    }
}

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

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

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px 12px;
    }

    .stat-num {
        font-size: 1.6rem;
    }

    .stat-label {
        font-size: 0.82rem;
    }

    .section-head h2 {
        font-size: 1.28rem;
    }

    .card h3 {
        font-size: 1.08rem;
    }

    .article-body {
        padding: 20px 18px;
    }
}

/* ============================================================
   无障碍 - 减少动效偏好
   ============================================================ */
@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;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ============================================================
   打印样式
   ============================================================ */
@media print {
    .site-header,
    .mobile-menu,
    .back-top,
    .hero-visual,
    .carousel-dots,
    .hero-cta {
        display: none !important;
    }

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

    .hero {
        background: #fff;
        color: #000;
        padding: 20px 0;
    }

    .hero::before,
    .hero::after {
        display: none;
    }

    .hero h1 span {
        -webkit-text-fill-color: #000;
        color: #000;
    }

    .card,
    .article-card,
    .faq-item,
    .step,
    .contact-card {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }

    .section {
        padding: 24px 0;
    }
}
```