```css
/* ============================================================
   魅影直播 - ranqiao.cn
   生活分享与户外直播，发现精彩现场
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
    --brand: #ff6b35;
    --brand-dark: #e55a2b;
    --brand-light: #fff3ed;
    --brand-glow: rgba(255, 107, 53, 0.4);
    --bg: #fafafa;
    --bg-alt: #ffffff;
    --bg-card: #ffffff;
    --bg-elevated: rgba(255, 255, 255, 0.72);
    --text: #2c2c2c;
    --text-heading: #1a1a2e;
    --text-muted: #666;
    --text-faint: #999;
    --border: #eeeeee;
    --border-strong: #dddddd;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-pill: 999px;
    --hero-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 45%, #0f3460 100%);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

/* ---------- 暗色模式变量 ---------- */
body.dark-mode {
    --bg: #1a1a2e;
    --bg-alt: #16213e;
    --bg-card: #1e2a4a;
    --bg-elevated: rgba(30, 42, 74, 0.72);
    --text: #e0e0e0;
    --text-heading: #f0f0f0;
    --text-muted: #aaaaaa;
    --text-faint: #888888;
    --border: #2a3a5a;
    --border-strong: #3a4a6a;
    --brand-light: #2a2a4a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

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

a {
    color: var(--brand);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

a:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 2px;
    border-radius: 4px;
}

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

ul,
ol {
    padding-left: 1.5rem;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.35;
    color: var(--text-heading);
    transition: color var(--transition);
}

p {
    transition: color var(--transition);
}

button {
    font-family: inherit;
    cursor: pointer;
}

input {
    font-family: inherit;
}

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

/* ---------- 容器 ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ============================================================
   导航吸顶 + 毛玻璃
   ============================================================ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.82);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    transition: background var(--transition), box-shadow var(--transition);
}

body.dark-mode .site-header {
    background: rgba(22, 33, 62, 0.82);
    border-bottom-color: rgba(255, 255, 255, 0.06);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 16px;
}

/* ---------- Logo ---------- */
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--brand);
    white-space: nowrap;
    transition: transform var(--transition);
}

.logo:hover {
    color: var(--brand);
    transform: scale(1.03);
}

.logo svg {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ---------- 导航菜单 ---------- */
.nav-menu {
    display: flex;
    gap: 4px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-menu a {
    display: block;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    color: #444;
    transition: background var(--transition), color var(--transition), transform var(--transition);
    position: relative;
}

body.dark-mode .nav-menu a {
    color: #cccccc;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 3px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--brand);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: width var(--transition);
}

.nav-menu a:hover {
    background: var(--brand-light);
    color: var(--brand);
}

.nav-menu a:hover::after {
    width: 60%;
}

body.dark-mode .nav-menu a:hover {
    background: var(--brand-light);
}

/* ---------- 导航操作区 ---------- */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* ---------- 搜索框 ---------- */
.search-box {
    display: flex;
    align-items: center;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-pill);
    overflow: hidden;
    background: rgba(255, 255, 255, 0.5);
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

body.dark-mode .search-box {
    background: rgba(42, 58, 90, 0.5);
}

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

.search-box input {
    border: none;
    outline: none;
    padding: 6px 14px;
    font-size: 0.9rem;
    width: 160px;
    background: transparent;
    color: inherit;
    transition: width var(--transition);
}

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

.search-box button {
    border: none;
    background: var(--brand);
    color: #fff;
    padding: 7px 14px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background var(--transition);
}

.search-box button:hover {
    background: var(--brand-dark);
}

/* ---------- 暗色/移动端切换按钮 ---------- */
.dark-toggle,
.mobile-toggle {
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    font-size: 1rem;
    line-height: 1.4;
    color: inherit;
    transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

body.dark-mode .dark-toggle,
body.dark-mode .mobile-toggle {
    background: rgba(42, 58, 90, 0.5);
}

.dark-toggle:hover,
.mobile-toggle:hover {
    border-color: var(--brand);
    transform: translateY(-1px);
}

.mobile-toggle {
    display: none;
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.88rem;
    color: var(--text-faint);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
}

.breadcrumb a {
    color: var(--brand);
    transition: color 0.2s ease;
}

.breadcrumb a:hover {
    color: var(--brand-dark);
    text-decoration: underline;
}

.breadcrumb span {
    margin: 0 6px;
    color: var(--text-faint);
}

/* ============================================================
   首屏 Hero - 渐变 Banner
   ============================================================ */
.hero {
    background: var(--hero-gradient);
    color: #fff;
    padding: 72px 0 56px;
    position: relative;
    overflow: hidden;
    isolation: isolate;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 15% 20%, rgba(255, 107, 53, 0.18) 0%, transparent 45%),
        radial-gradient(circle at 85% 80%, rgba(15, 52, 96, 0.6) 0%, transparent 55%);
    z-index: -1;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    right: -80px;
    top: -80px;
    width: 360px;
    height: 360px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.25) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    animation: heroFloat 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-20px, 20px) scale(1.08); }
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 2.4rem;
    line-height: 1.3;
    margin-bottom: 18px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.01em;
}

.hero h1 span {
    color: var(--brand);
    position: relative;
    display: inline-block;
}

.hero h1 span::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 2px;
    width: 100%;
    height: 6px;
    background: rgba(255, 107, 53, 0.3);
    border-radius: 3px;
    z-index: -1;
}

.hero p.lead {
    font-size: 1.1rem;
    color: #cfd8e3;
    margin-bottom: 26px;
    max-width: 560px;
}

.hero-cta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-block;
    padding: 12px 26px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
    will-change: transform;
}

.btn-primary {
    background: var(--brand);
    color: #fff;
    box-shadow: 0 4px 14px var(--brand-glow);
}

.btn-primary:hover {
    background: var(--brand-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--brand-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-ghost {
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    color: #fff;
    background: rgba(255, 255, 255, 0.04);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}

.btn-ghost:hover {
    border-color: var(--brand);
    color: var(--brand);
    background: rgba(255, 107, 53, 0.08);
    transform: translateY(-2px);
}

/* ---------- Hero 视觉 ---------- */
.hero-visual {
    position: relative;
}

.hero-visual svg {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    transition: transform var(--transition);
}

.hero-visual:hover svg {
    transform: translateY(-4px) scale(1.01);
}

/* ============================================================
   通用区块
   ============================================================ */
section {
    padding: 56px 0;
    position: relative;
}

section:nth-child(even) {
    background: var(--bg-alt);
}

body.dark-mode section:nth-child(even) {
    background: var(--bg-alt);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-heading);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 4px;
    background: linear-gradient(90deg, var(--brand), var(--brand-dark));
    border-radius: 2px;
    margin-top: 10px;
}

.section-sub {
    color: var(--text-muted);
    margin-bottom: 34px;
    max-width: 720px;
    font-size: 1rem;
}

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

.stats-grid > div {
    padding: 28px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.stats-grid > div::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand), var(--brand-dark));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.stats-grid > div:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand);
}

.stats-grid > div:hover::before {
    transform: scaleX(1);
}

.stat-num {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--brand);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 4px;
}

/* ============================================================
   卡片网格
   ============================================================ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    position: relative;
    overflow: hidden;
}

.card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(255, 107, 53, 0.06) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(255, 107, 53, 0.35);
}

.card:hover::after {
    opacity: 1;
}

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

.card h4 {
    font-size: 1.02rem;
    margin-bottom: 10px;
    color: var(--text-heading);
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.card ul li {
    margin-bottom: 6px;
    font-size: 0.92rem;
}

.card ul li a {
    color: var(--text-muted);
    transition: color 0.2s ease, padding-left 0.2s ease;
    display: inline-block;
}

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

.card-icon {
    width: 44px;
    height: 44px;
    margin-bottom: 14px;
    transition: transform var(--transition);
}

.card:hover .card-icon {
    transform: scale(1.08) rotate(-4deg);
}

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

.article-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
    display: flex;
    flex-direction: column;
}

.article-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: rgba(255, 107, 53, 0.3);
}

.article-meta {
    font-size: 0.82rem;
    color: var(--text-faint);
    margin-bottom: 8px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
}

.article-meta time {
    position: relative;
    padding-left: 16px;
}

.article-meta time::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--brand);
}

.article-meta span {
    background: var(--brand-light);
    color: var(--brand);
    padding: 1px 10px;
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-weight: 600;
}

.article-item h3 {
    font-size: 1.08rem;
    margin-bottom: 8px;
}

.article-item h3 a {
    color: var(--text-heading);
    transition: color 0.2s ease;
}

.article-item h3 a:hover {
    color: var(--brand);
}

.article-item p {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    flex-grow: 1;
}

.read-more {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--brand);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition), color 0.2s ease;
    margin-top: auto;
}

.read-more:hover {
    color: var(--brand-dark);
    gap: 8px;
}

/* ============================================================
   FAQ 手风琴
   ============================================================ */
.faq-list {
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border);
    transition: border-color var(--transition);
}

.faq-item:first-child {
    border-top: 1px solid var(--border);
}

.faq-question {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 18px 0;
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--text-heading);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: color 0.2s ease;
}

.faq-question:hover {
    color: var(--brand);
}

.faq-question .arrow {
    transition: transform var(--transition), color 0.2s ease;
    color: var(--brand);
    font-size: 1.2rem;
    flex-shrink: 0;
}

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

.faq-item.open .faq-question {
    color: var(--brand);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.faq-answer p {
    padding-bottom: 18px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ============================================================
   HowTo 步骤
   ============================================================ */
.howto-steps {
    counter-reset: step;
    display: grid;
    gap: 20px;
    margin-top: 20px;
}

.howto-step {
    position: relative;
    padding-left: 64px;
    padding-bottom: 4px;
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--brand-light);
    color: var(--brand);
    font-weight: 800;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.howto-step:hover::before {
    background: var(--brand);
    color: #fff;
    transform: scale(1.08);
    box-shadow: 0 4px 14px var(--brand-glow);
}

.howto-step h4 {
    font-size: 1.05rem;
    margin-bottom: 6px;
    color: var(--text-heading);
}

.howto-step p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ============================================================
   客户评价
   ============================================================ */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.testimonial {
    background: var(--bg-card);
    border-left: 4px solid var(--brand);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-left-color var(--transition);
    position: relative;
}

.testimonial::before {
    content: '"';
    position: absolute;
    top: 8px;
    right: 18px;
    font-size: 3.5rem;
    line-height: 1;
    color: var(--brand);
    opacity: 0.12;
    font-family: Georgia, serif;
    pointer-events: none;
}

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

.testimonial p {
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 14px;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--text-heading);
}

.testimonial-role {
    font-size: 0.82rem;
    color: var(--text-faint);
}

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

.contact-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--brand), var(--brand-dark));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(255, 107, 53, 0.3);
}

.contact-item:hover::before {
    transform: scaleX(1);
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--brand);
}

.contact-item p {
    font-size: 0.92rem;
    color: var(--text-muted);
    word-break: break-word;
}

/* ============================================================
   锚点导航
   ============================================================ */
.anchor-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.anchor-nav a {
    padding: 6px 14px;
    background: var(--brand-light);
    border-radius: var(--radius-pill);
    font-size: 0.88rem;
    color: var(--brand);
    font-weight: 500;
    transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.anchor-nav a:hover {
    background: var(--brand);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--brand-glow);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
    background: #1a1a2e;
    color: #bbbbbb;
    padding: 48px 0 24px;
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand), var(--brand-dark), var(--brand));
    background-size: 200% 100%;
    animation: footerLine 4s linear infinite;
}

@keyframes footerLine {
    0% { background-position: 0% 0; }
    100% { background-position: 200% 0; }
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.footer-grid h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 14px;
    position: relative;
    padding-bottom: 10px;
}

.footer-grid h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 28px;
    height: 2px;
    background: var(--brand);
    border-radius: 1px;
}

.footer-grid ul {
    list-style: none;
    padding: 0;
}

.footer-grid li {
    margin-bottom: 8px;
}

.footer-grid a {
    color: #bbbbbb;
    font-size: 0.9rem;
    transition: color 0.2s ease, padding-left 0.2s ease;
    display: inline-block;
}

.footer-grid a:hover {
    color: var(--brand);
    padding-left: 4px;
}

.footer-grid p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: #bbbbbb;
}

.footer-bottom {
    border-top: 1px solid #2a2a4a;
    padding-top: 20px;
    text-align: center;
    font-size: 0.85rem;
    color: #888888;
}

.footer-bottom p {
    color: #888888;
}

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 999;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: none;
    background: var(--brand);
    color: #fff;
    font-size: 1.3rem;
    line-height: 1;
    box-shadow: 0 4px 16px var(--brand-glow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background var(--transition), box-shadow var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.back-top:hover {
    background: var(--brand-dark);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px var(--brand-glow);
}

.back-top:active {
    transform: translateY(0);
}

/* ============================================================
   滚动动画
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    will-change: opacity, transform;
}

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

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

/* ============================================================
   懒加载占位
   ============================================================ */
.lazy-img {
    background: #e8e8e8;
    border-radius: var(--radius-sm);
}

body.dark-mode .lazy-img {
    background: var(--brand-light);
}

/* ============================================================
   轮播
   ============================================================ */
.carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-slide {
    min-width: 100%;
    flex-shrink: 0;
}

.carousel-slide svg {
    width: 100%;
    display: block;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 14px;
}

.carousel-dots button {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: #cccccc;
    transition: background var(--transition), transform var(--transition), width var(--transition);
    padding: 0;
}

.carousel-dots button:hover {
    background: var(--brand-dark);
    transform: scale(1.2);
}

.carousel-dots button.active {
    background: var(--brand);
    width: 24px;
    border-radius: var(--radius-pill);
}

body.dark-mode .carousel-dots button {
    background: #444444;
}

body.dark-mode .carousel-dots button.active {
    background: var(--brand);
}

/* ============================================================
   内容排版细节（section 内 h3 / p）
   ============================================================ */
section > .container > h3 {
    font-size: 1.25rem;
    margin: 28px 0 10px;
    color: var(--text-heading);
    padding-left: 14px;
    border-left: 4px solid var(--brand);
    border-radius: 2px;
    line-height: 1.4;
}

section > .container > h3:first-of-type {
    margin-top: 8px;
}

section > .container > p {
    color: var(--text-muted);
    margin-bottom: 14px;
    font-size: 0.98rem;
    max-width: 100%;
}

section > .container > p a {
    color: var(--brand);
    font-weight: 500;
}

section > .container > p a:hover {
    text-decoration: underline;
}

/* ============================================================
   响应式 - 平板
   ============================================================ */
@media (max-width: 1024px) {
    .hero-inner {
        gap: 32px;
    }
    .hero h1 {
        font-size: 2rem;
    }
    .search-box input {
        width: 130px;
    }
}

/* ============================================================
   响应式 - 移动端导航与首屏
   ============================================================ */
@media (max-width: 900px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.96);
        -webkit-backdrop-filter: blur(18px);
        backdrop-filter: blur(18px);
        flex-direction: column;
        padding: 12px;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        border-bottom: 1px solid var(--border);
        gap: 2px;
        animation: menuSlide 0.25s ease;
    }

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

    body.dark-mode .nav-menu {
        background: rgba(22, 33, 62, 0.96);
    }

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

    .nav-menu a {
        padding: 12px 16px;
        font-size: 1rem;
    }

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

    .mobile-toggle {
        display: block;
    }

    .search-box input {
        width: 100px;
    }

    .search-box input:focus {
        width: 130px;
    }

    .hero-inner {
        grid-template-columns: 1fr;
    }

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

    .hero p.lead {
        font-size: 1rem;
    }

    .hero {
        padding: 56px 0 44px;
    }

    .hero-visual {
        max-width: 520px;
        margin: 0 auto;
    }

    section {
        padding: 44px 0;
    }

    .section-title {
        font-size: 1.5rem;
    }
}

/* ============================================================
   响应式 - 小屏手机
   ============================================================ */
@media (max-width: 700px) {
    html {
        font-size: 15px;
    }

    .container {
        padding: 0 16px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .stats-grid > div {
        padding: 20px 12px;
    }

    .stat-num {
        font-size: 1.8rem;
    }

    .stat-label {
        font-size: 0.85rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .article-list {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .testimonial-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .hero h1 {
        font-size: 1.55rem;
    }

    .hero p.lead {
        font-size: 0.95rem;
    }

    .hero-cta {
        gap: 10px;
    }

    .btn {
        padding: 11px 20px;
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 1.35rem;
    }

    .section-sub {
        font-size: 0.92rem;
        margin-bottom: 26px;
    }

    .howto-step {
        padding-left: 56px;
    }

    .howto-step::before {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }

    .faq-question {
        font-size: 0.96rem;
        padding: 15px 0;
    }

    .faq-answer p {
        font-size: 0.9rem;
    }

    .back-top {
        bottom: 18px;
        right: 18px;
        width: 42px;
        height: 42px;
        font-size: 1.15rem;
    }

    section > .container > h3 {
        font-size: 1.12rem;
    }

    .search-box input {
        width: 80px;
        padding: 6px 10px;
    }

    .search-box input:focus {
        width: 110px;
    }
}

/* ============================================================
   响应式 - 超小屏
   ============================================================ */
@media (max-width: 480px) {
    .nav-wrap {
        height: 58px;
        gap: 8px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .logo svg {
        width: 28px;
        height: 28px;
    }

    .nav-menu {
        top: 58px;
    }

    .search-box {
        display: none;
    }

    .hero h1 {
        font-size: 1.4rem;
    }

    .hero {
        padding: 44px 0 36px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .stat-num {
        font-size: 1.5rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .anchor-nav a {
        font-size: 0.82rem;
        padding: 5px 12px;
    }

    .article-item,
    .card,
    .contact-item,
    .testimonial {
        padding: 20px;
    }
}

/* ============================================================
   响应式 - 页脚平板
   ============================================================ */
@media (max-width: 800px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}

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

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

    .hero {
        background: #fff;
        color: #000;
    }

    .hero h1,
    .hero h1 span {
        color: #000;
    }

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

    a {
        color: #000;
        text-decoration: underline;
    }
}

/* ============================================================
   高对比度模式支持
   ============================================================ */
@media (forced-colors: active) {
    .btn,
    .card,
    .article-item,
    .contact-item,
    .testimonial,
    .faq-item,
    .back-top {
        border: 1px solid ButtonText;
    }
}
```