/* roulang page: index */
:root {
    --primary: #0B2B26;
    --primary-dark: #071F1A;
    --accent: #B8FF29;
    --bg-soft: #F8F8F6;
    --text-heading: #111111;
    --text-body: #333333;
    --text-muted: #666666;
    --text-faint: #999999;
    --border-line: #E5E7EB;
    --radius-md: 6px;
    --radius-card: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.10);
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-body);
    line-height: 1.8;
    background: #fff;
  }
  a { color: inherit; text-decoration: none; }
  img { max-width: 100%; display: block; }
  input, button, textarea { font-family: inherit; }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
  }
  @media (max-width: 640px) {
    .container { padding-left: 16px; padding-right: 16px; }
  }

  .font-display { font-family: "Rajdhani", "DIN Alternate", Impact, sans-serif; letter-spacing: 0.02em; font-weight: 600; }

  /* ===== 导航 ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: #fff;
    border-bottom: 1px solid var(--border-line);
    box-shadow: var(--shadow-sm);
  }
  .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 16px;
  }
  .logo {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
  }
  .logo-mark {
    width: 30px;
    height: 30px;
    border-radius: 6px;
    background: var(--primary);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
  }
  .logo-text {
    font-size: 18px;
    font-weight: 800;
    color: var(--text-heading);
    line-height: 1.2;
  }
  .logo-text .c7 { color: #4cd83c; }
  .logo-sub {
    font-size: 10px;
    color: var(--text-faint);
    line-height: 1;
    margin-top: 2px;
    letter-spacing: 0.02em;
  }
  .main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
  }
  .nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-muted);
    padding: 10px 12px;
    position: relative;
    transition: color 0.2s ease;
    white-space: nowrap;
  }
  .nav-link:hover { color: #4cd83c; }
  .nav-link.active {
    color: var(--text-heading);
    font-weight: 600;
  }
  .nav-link.active::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 4px;
    height: 2px;
    background: #4cd83c;
  }
  .nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
  }
  .search-box {
    width: 160px;
    height: 36px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-soft);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 0 10px;
    transition: border-color .2s, box-shadow .2s;
  }
  .search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(184, 255, 41, 0.3);
  }
  .search-box input {
    border: none;
    outline: none;
    background: transparent;
    font-size: 13px;
    color: var(--text-body);
    width: 100%;
  }
  .search-box input::placeholder { color: #bbb; }
  .menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
  }
  .menu-toggle:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
  .mobile-menu {
    display: none;
    background: #fff;
    border-top: 1px solid var(--border-line);
    padding: 8px 16px 20px;
  }
  .mobile-menu.open { display: block; }
  .mobile-menu a.nav-link {
    display: block;
    padding: 12px 8px;
    font-size: 16px;
    border-bottom: 1px solid #f3f4f6;
  }
  .mobile-menu .mob-cta {
    display: block;
    margin-top: 16px;
  }
  @media (max-width: 1024px) {
    .main-nav { gap: 0; }
    .search-box { display: none; }
  }
  @media (max-width: 768px) {
    .nav-inner { height: 56px; }
    .main-nav { display: none; }
    .menu-toggle { display: flex; }
    .nav-right .btn { display: none; }
    .logo-sub { display: none; }
  }

  /* ===== 按钮 ===== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 40px;
    padding: 0 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all .2s ease;
    white-space: nowrap;
    -webkit-font-smoothing: antialiased;
  }
  .btn:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
  .btn:active { transform: scale(0.98); }
  .btn-primary { background: var(--primary); color: #fff; }
  .btn-primary:hover { background: var(--accent); color: #000; }
  .btn-accent { background: var(--accent); color: #000; }
  .btn-accent:hover { background: var(--primary); color: #fff; }
  .btn-outline {
    background: #fff;
    color: var(--text-heading);
    border: 1px solid var(--text-heading);
  }
  .btn-outline:hover { background: var(--bg-soft); }
  .btn-outline-light {
    background: transparent;
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.8);
  }
  .btn-outline-light:hover { background: rgba(255, 255, 255, 0.1); }
  .btn-block { width: 100%; }

  /* ===== Hero ===== */
  .hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat var(--primary);
  }
  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
  }
  .hero-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
  }
  .hero-content { max-width: 640px; }
  .hero-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.92);
    color: var(--text-heading);
    font-size: 12px;
    font-weight: 500;
    border-radius: 6px;
    padding: 4px 10px;
    margin-bottom: 24px;
  }
  .hero h1 {
    font-size: 44px;
    line-height: 1.25;
    font-weight: 900;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: -0.01em;
  }
  .hero h1 .c7 { color: var(--accent); }
  .c7-green { color: var(--accent); }
  .hero-sub {
    font-size: 16px;
    line-height: 1.8;
    color: #D1D5DB;
    max-width: 520px;
    margin-bottom: 32px;
  }
  .hero-cta { display: flex; gap: 12px; margin-bottom: 48px; flex-wrap: wrap; }
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 40px;
    justify-content: start;
  }
  .stat-item { display: flex; flex-direction: column; }
  .stat-num {
    font-family: "Rajdhani", "DIN Alternate", Impact, sans-serif;
    font-size: 30px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
  }
  .stat-label {
    font-size: 12px;
    color: #9CA3AF;
  }
  .hero-panel { display: flex; justify-content: flex-end; }
  .terminal-card {
    width: 100%;
    max-width: 380px;
    background: #fff;
    border: 1px solid #D1D5DB;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
  }
  .terminal-head {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    background: #F9FAFB;
    border-bottom: 1px solid #EEF0F2;
  }
  .terminal-head .dot { width: 10px; height: 10px; border-radius: 50%; display: block; }
  .dot-red { background: #F87171; }
  .dot-yellow { background: #FBBF24; }
  .dot-green { background: #34D399; }
  .terminal-body {
    padding: 20px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 14px;
    line-height: 2;
    color: var(--text-body);
  }
  .term-key { color: var(--primary); font-weight: 600; margin-right: 8px; }
  .term-val { color: #0ea25f; }
  @media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr 320px; gap: 36px; }
  }
  @media (max-width: 768px) {
    .hero { min-height: 85vh; }
    .hero-inner { grid-template-columns: 1fr; }
    .hero h1 { font-size: 30px; }
    .hero-cta { flex-direction: column; width: 100%; }
    .hero-cta .btn { width: 100%; }
    .hero-panel { display: none; }
    .hero-stats { gap: 32px; }
  }

  /* ===== 通用板块 ===== */
  .section { padding: 96px 0; }
  .section-alt { background: var(--bg-soft); }
  @media (max-width: 768px) { .section { padding: 64px 0; } }

  .section-head { margin-bottom: 48px; }
  .section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    margin-bottom: 14px;
  }
  .section-tag::before {
    content: "";
    width: 8px;
    height: 8px;
    background: var(--accent);
    display: inline-block;
  }
  .section-head h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-heading);
    line-height: 1.3;
  }
  @media (max-width: 768px) { .section-head h2 { font-size: 24px; } }

  /* ===== 核心能力 ===== */
  .feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .feature-card {
    border-radius: var(--radius-card);
    padding: 32px;
    transition: box-shadow .25s ease, transform .25s ease;
  }
  .feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
  .feature-card-light {
    background: #F9FAFB;
    border: 1px solid var(--border-line);
  }
  .feature-card-dark {
    background: var(--primary);
    color: #fff;
    border: none;
    box-shadow: var(--shadow-lg);
    grid-row: span 2;
    display: flex;
    flex-direction: column;
  }
  .feature-card-wide {
    grid-column: span 2;
    background: #fff;
    border: 1px solid var(--border-line);
  }
  .feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(184, 255, 41, 0.15);
    color: var(--primary);
    margin-bottom: 20px;
  }
  .feature-card-dark .feature-icon {
    background: rgba(184, 255, 41, 0.2);
    color: var(--accent);
  }
  .feature-icon svg { width: 22px; height: 22px; }
  .feature-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-heading);
  }
  .feature-card-dark .feature-title { color: #fff; }
  .feature-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-muted);
    margin-bottom: 16px;
    flex: 1;
  }
  .feature-card-dark .feature-desc { color: #D1D5DB; }
  .feature-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color .2s;
  }
  .feature-link:hover { color: #4cd83c; }
  .feature-link:hover .arrow { transform: translateX(4px); }
  .feature-link .arrow { transition: transform .2s; }
  .feature-card-dark .feature-link { color: var(--accent); }
  .feature-card-dark .feature-link:hover { color: #fff; }
  @media (max-width: 768px) {
    .feature-grid { grid-template-columns: 1fr; }
    .feature-card-dark { grid-row: auto; }
    .feature-card-wide { grid-column: span 1; }
  }

  /* ===== 演示区 ===== */
  .section-demo {
    background: var(--primary);
    padding: 96px 0;
  }
  .demo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 56px;
  }
  .demo-text h2 { color: #fff; font-size: 32px; font-weight: 800; margin-bottom: 32px; }
  .demo-step { display: flex; gap: 16px; margin-bottom: 24px; }
  .step-num {
    font-family: "Rajdhani", "DIN Alternate", Impact, sans-serif;
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
    min-width: 48px;
  }
  .demo-step p { color: #D1D5DB; font-size: 15px; line-height: 1.8; }
  .demo-visual {}
  .browser-frame {
    background: #fff;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
  }
  .browser-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #F3F4F6;
    padding: 10px 14px;
    border-bottom: 1px solid #E5E7EB;
  }
  .browser-bar .brow-dot { width: 10px; height: 10px; border-radius: 50%; }
  .browser-url {
    flex: 1;
    background: #fff;
    border: 1px solid #E5E7EB;
    border-radius: 4px;
    font-size: 12px;
    padding: 3px 8px;
    color: var(--text-faint);
  }
  .browser-content img {
    width: 100%;
    height: auto;
    display: block;
  }
  .metric-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 40px;
  }
  .metric-item { text-align: center; }
  .metric-num {
    font-family: "Rajdhani", "DIN Alternate", Impact, sans-serif;
    font-size: 36px;
    font-weight: 700;
    color: var(--accent);
    display: block;
    line-height: 1.2;
  }
  .metric-label { font-size: 13px; color: #9CA3AF; }
  @media (max-width: 768px) {
    .section-demo { padding: 64px 0; }
    .demo-grid { grid-template-columns: 1fr; }
    .metric-strip { grid-template-columns: 1fr 1fr; }
    .demo-text h2 { font-size: 24px; }
  }

  /* ===== 社会认同 ===== */
  .proof-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
  }
  .proof-logos { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .proof-logo {
    border: 1px solid var(--border-line);
    border-radius: var(--radius-card);
    background: #fff;
    padding: 24px 20px;
    text-align: center;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 72px;
    transition: box-shadow .2s, border-color .2s;
  }
  .proof-logo:hover { box-shadow: var(--shadow-sm); border-color: #ccc; }
  .proof-quote {
    background: var(--bg-soft);
    border-left: 4px solid var(--accent);
    padding: 32px;
    border-radius: 0 var(--radius-card) var(--radius-card) 0;
    display: flex;
    align-items: center;
  }
  .proof-quote p {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.6;
    color: var(--text-heading);
  }
  .cert-badges {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
  }
  .cert-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--border-line);
    border-radius: 999px;
    padding: 6px 16px;
    font-size: 12px;
    color: var(--text-muted);
    background: #fff;
  }
  .cert-badge svg { width: 16px; height: 16px; color: var(--primary); }
  @media (max-width: 768px) {
    .proof-grid { grid-template-columns: 1fr; }
    .proof-logos { grid-template-columns: 1fr; }
  }

  /* ===== 新闻 / CMS ===== */
  .news-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }
  .news-header .view-all {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color .2s;
  }
  .news-header .view-all:hover { color: #4cd83c; }
  .news-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
  .news-card {
    border: 1px solid var(--border-line);
    border-radius: var(--radius-card);
    overflow: hidden;
    background: #fff;
    transition: box-shadow .25s ease, transform .25s ease;
    display: flex;
  }
  .news-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
  .news-card-link { display: flex; flex-direction: column; width: 100%; }
  .news-thumb {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: #eee;
  }
  .news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .25s ease;
  }
  .news-card:hover .news-thumb img { transform: scale(1.03); }
  .news-card-body { padding: 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
  .news-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-heading);
    line-height: 1.4;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
  }
  .news-excerpt {
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-muted);
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    flex: 1;
  }
  .news-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-faint);
  }
  .news-cat {
    display: inline-block;
    background: rgba(184, 255, 41, 0.2);
    color: var(--primary);
    border-radius: 999px;
    padding: 2px 10px;
    font-size: 12px;
    font-weight: 600;
  }
  .news-empty {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-faint);
    font-size: 14px;
    border: 1px dashed #ddd;
    border-radius: var(--radius-card);
    grid-column: 1 / -1;
  }
  @media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 640px) {
    .news-grid { grid-template-columns: 1fr; }
  }

  /* ===== 价格 ===== */
  .pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: stretch;
  }
  .price-card {
    background: #fff;
    border: 1px solid var(--border-line);
    border-radius: var(--radius-card);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: box-shadow .25s, transform .25s;
  }
  .price-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
  .price-card-featured {
    border: 2px solid var(--accent);
    box-shadow: var(--shadow-lg);
  }
  .price-tag {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: #000;
    color: #fff;
    font-size: 12px;
    font-weight: 500;
    padding: 3px 14px;
    border-radius: 999px;
    white-space: nowrap;
    letter-spacing: 0.04em;
  }
  .price-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 12px;
  }
  .price {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 20px;
    flex-wrap: wrap;
  }
  .price-num {
    font-family: "Rajdhani", "DIN Alternate", Impact, sans-serif;
    font-size: 40px;
    font-weight: 700;
    line-height: 1;
    color: var(--text-heading);
  }
  .price-period { font-size: 14px; color: var(--text-muted); }
  .price-card ul {
    list-style: none;
    margin-bottom: 28px;
    flex: 1;
  }
  .price-card ul li {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.8;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 8px;
  }
  .price-card ul li .check {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: rgba(184, 255, 41, 0.5);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-size: 11px;
    flex-shrink: 0;
    margin-top: 4px;
  }
  @media (max-width: 1024px) {
    .pricing-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
  }

  /* ===== FAQ ===== */
  .faq-wrap { max-width: 720px; margin: 0 auto; }
  .faq-list { display: flex; flex-direction: column; gap: 8px; }
  .faq-item {
    border: 1px solid var(--border-line);
    border-radius: var(--radius-card);
    background: #fff;
    overflow: hidden;
    transition: box-shadow .2s;
  }
  .faq-item:hover { box-shadow: var(--shadow-sm); }
  .faq-item summary {
    list-style: none;
    padding: 18px 20px;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-heading);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    user-select: none;
  }
  .faq-item summary::-webkit-details-marker { display: none; }
  .faq-item summary:hover { color: var(--primary); }
  .faq-icon {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-soft);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    transition: background .2s, transform .3s;
  }
  .faq-icon::before,
  .faq-icon::after {
    content: "";
    position: absolute;
    background: var(--text-heading);
    border-radius: 2px;
    transition: background .2s;
  }
  .faq-icon::before { width: 10px; height: 2px; }
  .faq-icon::after { width: 2px; height: 10px; }
  .faq-item[open] .faq-icon { transform: rotate(45deg); background: var(--accent); }
  .faq-answer {
    background: var(--bg-soft);
    border-left: 4px solid var(--accent);
    padding: 16px 24px 20px;
    font-size: 14px;
    line-height: 1.9;
    color: var(--text-muted);
  }
  .faq-cta { text-align: center; margin-top: 32px; }

  /* ===== 最终 CTA ===== */
  .section-cta {
    background: var(--primary-dark);
    padding: 72px 0;
    text-align: center;
  }
  .section-cta h2 {
    font-size: 32px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
  }
  .section-cta p { color: #D1D5DB; font-size: 16px; margin-bottom: 32px; }
  .cta-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
  @media (max-width: 640px) {
    .cta-actions { flex-direction: column; }
    .cta-actions .btn { width: 100%; }
  }

  /* ===== 页脚 ===== */
  .site-footer {
    background: #111;
    color: #9CA3AF;
  }
  .footer-top {
    border-top: 3px solid var(--accent);
    padding: 48px 0 40px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 48px;
  }
  .footer-logo {
    font-size: 18px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    display: block;
  }
  .footer-logo .c7 { color: var(--accent); }
  .footer-brand p { font-size: 14px; line-height: 1.8; color: #9CA3AF; max-width: 300px; }
  .footer-h {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
  }
  .footer-links-col a {
    display: block;
    font-size: 14px;
    color: #9CA3AF;
    margin-bottom: 10px;
    transition: color .2s;
  }
  .footer-links-col a:hover { color: var(--accent); }
  .footer-contact p { font-size: 14px; color: #9CA3AF; margin-bottom: 10px; line-height: 1.7; }
  .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding: 16px 0;
    text-align: center;
    font-size: 12px;
    color: #6B7280;
  }
  @media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  }

  /* ===== 浮动 CTA ===== */
  .float-cta {
    position: fixed;
    right: 40px;
    bottom: 40px;
    z-index: 60;
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s, visibility .3s, transform .3s;
    transform: translateY(16px);
  }
  .float-cta.show { opacity: 1; visibility: visible; transform: translateY(0); }
  .float-main {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--accent);
    color: #000;
    border: none;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .2s, transform .2s;
  }
  .float-main:hover { background: var(--primary); color: #fff; transform: scale(1.04); }
  .float-pop {
    position: absolute;
    right: 0;
    bottom: 68px;
    background: #fff;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-lg);
    width: 240px;
    padding: 20px;
    display: none;
  }
  .float-pop.show { display: block; }
  .float-pop p { font-size: 14px; color: var(--text-body); margin-bottom: 12px; line-height: 1.6; }
  .float-pop .btn { width: 100%; }
  @media (max-width: 640px) {
    .float-cta { right: 16px; bottom: 16px; }
    .float-main { width: 48px; height: 48px; font-size: 12px; }
  }

  /* ===== 锚点偏移 ===== */
  #features, #demo, #proof, #pricing, #faq, #news { scroll-margin-top: 72px; }

  @media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
  }

/* roulang page: article */
:root {
            --primary: #0B2B26;
            --accent: #B8FF29;
            --secondary: #F8F8F6;
            --ink: #111111;
            --text: #333333;
            --muted: #666666;
            --faint: #999999;
            --border: #E5E7EB;
            --radius: 8px;
            --radius-sm: 6px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.10);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            color: var(--text);
            background: #fff;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }
        button {
            font-family: inherit;
            border: none;
            cursor: pointer;
        }
        input {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .font-display {
            font-family: "Rajdhani", "DIN Alternate", Impact, sans-serif;
            letter-spacing: 0.02em;
        }

        /* Header */
        .site-header {
            background: #fff;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 50;
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 16px;
        }
        .brand {
            display: flex;
            align-items: baseline;
            gap: 6px;
            flex-shrink: 0;
        }
        .brand-mark {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 6px;
            background: var(--primary);
            color: var(--accent);
            font-size: 18px;
            font-weight: 800;
        }
        .brand-name {
            font-size: 18px;
            font-weight: 800;
            color: var(--ink);
            line-height: 1;
        }
        .brand-c7 {
            color: var(--accent);
            text-shadow: 0 0 12px rgba(184, 255, 41, 0.4);
        }
        .brand-sub {
            font-size: 10px;
            color: var(--faint);
            letter-spacing: 0.02em;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
            flex: 1;
            justify-content: center;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            padding: 6px 2px;
            position: relative;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-link.active {
            color: var(--ink);
            font-weight: 600;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .search-box {
            display: flex;
            align-items: center;
            background: var(--secondary);
            border-radius: 6px;
            height: 36px;
            padding: 0 10px;
            width: 160px;
            border: 1px solid transparent;
            transition: border-color .2s, box-shadow .2s;
        }
        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(184, 255, 41, 0.18);
        }
        .search-box input {
            border: none;
            outline: none;
            background: transparent;
            width: 100%;
            font-size: 13px;
            color: var(--ink);
        }
        .search-box input::placeholder {
            color: var(--faint);
        }
        .search-icon {
            color: var(--faint);
            margin-right: 6px;
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 600;
            height: 40px;
            padding: 0 20px;
            transition: background .2s, color .2s, box-shadow .2s, border-color .2s, transform .1s;
            white-space: nowrap;
        }
        .btn:active {
            transform: scale(0.98);
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--accent);
            color: #000;
        }
        .btn-accent {
            background: var(--accent);
            color: #000;
        }
        .btn-accent:hover {
            background: var(--primary);
            color: #fff;
        }
        .btn-outline {
            background: #fff;
            color: var(--ink);
            border: 1px solid var(--ink);
        }
        .btn-outline:hover {
            background: var(--secondary);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.5);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .btn-sm {
            height: 36px;
            padding: 0 16px;
            font-size: 13px;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            padding: 8px;
        }
        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: transform .2s;
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 16px 24px 24px;
            flex-direction: column;
            gap: 4px;
            z-index: 49;
            box-shadow: var(--shadow-lg);
        }
        .mobile-menu a {
            padding: 12px 4px;
            font-size: 15px;
            font-weight: 500;
            color: var(--ink);
            border-bottom: 1px solid var(--secondary);
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }
        .mobile-menu.open {
            display: flex;
        }

        /* Breadcrumb */
        .breadcrumb-area {
            background: var(--secondary);
            border-bottom: 1px solid var(--border);
            padding: 20px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--muted);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb-sep {
            color: var(--faint);
            font-size: 12px;
        }
        .breadcrumb-cat {
            display: inline-block;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 1px 12px;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
        }
        .breadcrumb-title {
            color: var(--ink);
            font-weight: 500;
            max-width: 420px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* Article */
        .article-wrapper {
            padding: 48px 0 64px;
        }
        .article-container {
            max-width: 820px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .article-header {
            margin-bottom: 32px;
        }
        .article-title {
            font-size: 28px;
            font-weight: 800;
            line-height: 1.35;
            color: var(--ink);
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--faint);
            flex-wrap: wrap;
            border-bottom: 1px solid var(--border);
            padding-bottom: 20px;
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .article-meta svg {
            width: 14px;
            height: 14px;
        }

        /* CMS 注入区 */
        .article-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text);
            margin-top: 32px;
        }
        .article-content p {
            margin-bottom: 24px;
        }
        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--ink);
            margin-top: 48px;
            margin-bottom: 16px;
            line-height: 1.4;
        }
        .article-content h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--ink);
            margin-top: 32px;
            margin-bottom: 12px;
            line-height: 1.4;
        }
        .article-content h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-top: 24px;
            margin-bottom: 10px;
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
        }
        .article-content a:hover {
            color: var(--ink);
        }
        .article-content blockquote {
            border-left: 4px solid var(--accent);
            background: var(--secondary);
            border-radius: 0 8px 8px 0;
            padding: 16px 24px;
            font-size: 14px;
            font-style: italic;
            color: var(--muted);
            margin: 24px 0;
        }
        .article-content code {
            background: #1a1a1a;
            color: #f0f0f0;
            border-radius: 6px;
            padding: 2px 8px;
            font-size: 13px;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
        }
        .article-content pre {
            background: #111;
            border-radius: 8px;
            padding: 20px 24px;
            overflow-x: auto;
            margin: 24px 0;
            line-height: 1.6;
        }
        .article-content pre code {
            background: transparent;
            padding: 0;
            color: #e5e7eb;
            font-size: 13px;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 24px;
            padding-left: 24px;
        }
        .article-content ul {
            list-style: disc;
        }
        .article-content ol {
            list-style: decimal;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content img {
            border-radius: 8px;
            margin: 24px 0;
        }
        .article-content figcaption {
            font-size: 12px;
            color: var(--faint);
            text-align: center;
            margin-top: -16px;
            margin-bottom: 24px;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 14px;
        }
        .article-content table th,
        .article-content table td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-content table th {
            background: var(--secondary);
            font-weight: 700;
            color: var(--ink);
        }
        .article-content table tr:hover td {
            background: #fafaf8;
        }
        /* 静态区 */
        .article-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .tag {
            display: inline-block;
            background: var(--secondary);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 4px 14px;
            font-size: 12px;
            color: var(--muted);
            font-weight: 500;
            transition: background .2s, color .2s, border-color .2s;
        }
        .tag:hover {
            background: var(--accent);
            color: #000;
            border-color: var(--accent);
        }

        .not-found {
            text-align: center;
            padding: 60px 24px;
            border: 1px dashed var(--border);
            border-radius: 8px;
            margin: 32px 0;
        }
        .not-found h3 {
            font-size: 20px;
            color: var(--ink);
            margin-bottom: 12px;
        }
        .not-found p {
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 20px;
        }

        /* Related */
        .related-section {
            background: #fff;
            padding: 56px 0 16px;
        }
        .related-section .section-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 28px;
        }
        .related-section .section-head h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--ink);
            position: relative;
            padding-left: 16px;
        }
        .related-section .section-head h2::before {
            content: "";
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 6px;
            height: 24px;
            background: var(--accent);
            border-radius: 3px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            transition: box-shadow .2s, transform .2s;
            display: block;
        }
        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .related-card .card-img {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--secondary);
        }
        .related-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s;
        }
        .related-card:hover .card-img img {
            transform: scale(1.03);
        }
        .related-card .card-body {
            padding: 20px;
        }
        .related-card .card-body h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.45;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.6;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-meta {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
            color: var(--faint);
        }
        .related-card .card-meta .cat-dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent);
        }

        /* Back entry */
        .back-entry {
            text-align: center;
            padding: 32px 24px 56px;
            background: #fff;
        }
        .back-entry .btn {
            min-width: 180px;
        }

        /* CTA final */
        .cta-final {
            background: var(--primary);
            padding: 72px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-final::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--accent);
        }
        .cta-final h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-final p {
            font-size: 15px;
            color: #D1D5DB;
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-final .cta-buttons {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: #111111;
            color: #9CA3AF;
            border-top: 3px solid var(--accent);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 4fr 4fr 4fr;
            gap: 48px;
            padding: 48px 0 32px;
        }
        .footer-brand .footer-logo {
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 4px;
            margin-bottom: 12px;
        }
        .footer-brand .footer-logo .c7 {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.8;
            color: #8A8F98;
            max-width: 320px;
        }
        .footer-h {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-links-col {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links-col a {
            font-size: 14px;
            color: #9CA3AF;
        }
        .footer-links-col a:hover {
            color: var(--accent);
        }
        .footer-contact p {
            font-size: 14px;
            color: #9CA3AF;
            margin-bottom: 8px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 16px 0;
            text-align: center;
        }
        .footer-bottom p {
            font-size: 12px;
            color: #6B7280;
        }

        /* Floating CTA */
        .floating-cta {
            position: fixed;
            right: 40px;
            bottom: 40px;
            z-index: 90;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 12px;
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            transition: opacity .3s, transform .3s;
        }
        .floating-cta.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }
        .float-btn {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--accent);
            color: #000;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            transition: background .2s, transform .2s;
            font-size: 14px;
            font-weight: 700;
        }
        .float-btn:hover {
            background: #d6ff5c;
            transform: scale(1.05);
        }
        .float-bubble {
            background: #fff;
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
            padding: 20px;
            width: 240px;
            border: 1px solid var(--border);
            display: none;
        }
        .float-bubble.show {
            display: block;
            animation: popIn .25s ease;
        }
        .float-bubble p {
            font-size: 13px;
            color: var(--muted);
            line-height: 1.6;
            margin-bottom: 12px;
        }
        .float-bubble .btn {
            width: 100%;
            height: 36px;
            font-size: 13px;
        }
        @keyframes popIn {
            from {
                opacity: 0;
                transform: scale(0.9);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-nav {
                gap: 16px;
            }
            .search-box {
                width: 130px;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                height: 56px;
            }
            .main-nav {
                display: none;
            }
            .search-box {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .brand-sub {
                display: none;
            }
            .header-actions .btn-sm {
                height: 36px;
                padding: 0 12px;
                font-size: 13px;
            }
            .mobile-menu.open {
                display: flex;
            }
            .breadcrumb-area {
                padding: 14px 0;
            }
            .breadcrumb-title {
                max-width: 180px;
            }
            .article-wrapper {
                padding: 32px 0 48px;
            }
            .article-title {
                font-size: 22px;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .related-section {
                padding: 40px 0 8px;
            }
            .related-section .section-head h2 {
                font-size: 22px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                padding: 40px 0 24px;
            }
            .cta-final {
                padding: 56px 16px;
            }
            .cta-final h2 {
                font-size: 26px;
            }
            .floating-cta {
                right: 16px;
                bottom: 16px;
            }
            .float-btn {
                width: 48px;
                height: 48px;
                font-size: 13px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .header-actions .btn-sm {
                display: none;
            }
            .article-container {
                padding: 0 16px;
            }
            .breadcrumb {
                font-size: 12px;
                gap: 6px;
            }
            .breadcrumb-cat {
                padding: 0 10px;
                font-size: 11px;
            }
            .cta-buttons .btn {
                width: 100%;
            }
        }

/* roulang page: category1 */
:root {
  --primary: #0B2B26;
  --accent: #B8FF29;
  --secondary: #F8F8F6;
  --text-title: #111111;
  --text-body: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border: #E5E7EB;
  --radius-btn: 6px;
  --radius-card: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  --font-display: "Rajdhani", "DIN Alternate", Impact, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-body);
  line-height: 1.8;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease; }
input, button, textarea { font-family: inherit; }
button { cursor: pointer; }
ul { list-style: none; }

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 22px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-btn);
  border: none;
  transition: all .2s ease;
  white-space: nowrap;
  text-decoration: none;
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--accent); color: #111; }
.btn-accent { background: var(--accent); color: #111; }
.btn-accent:hover { background: var(--primary); color: #fff; }
.btn-outline { background: #fff; color: #111; border: 1px solid #111; }
.btn-outline:hover { background: var(--secondary); }
.btn-outline-light { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.6); }
.btn-outline-light:hover { background: rgba(255,255,255,0.12); border-color: #fff; }
.btn-block { width: 100%; }
.btn-lg { height: 44px; padding: 0 30px; font-size: 15px; }
.btn-sm { height: 36px; padding: 0 16px; font-size: 13px; }

/* ===== 导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-badge {
  width: 34px;
  height: 34px;
  background: var(--primary);
  color: var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.logo-text {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.02em;
}
.logo-text .c7 { color: #000; }
.logo-text .c7-light { color: var(--accent); background: var(--primary); padding: 1px 4px; border-radius: 4px; }
.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 0 auto;
}
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width .25s ease;
}
.nav-link:hover { color: var(--primary); }
.nav-link:hover::after { width: 100%; }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after { width: 100%; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}
.search-box {
  display: flex;
  align-items: center;
  width: 170px;
  height: 36px;
  background: var(--secondary);
  border-radius: 6px;
  padding: 0 12px;
  gap: 6px;
  border: 1px solid transparent;
  transition: border-color .2s, box-shadow .2s;
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(184,255,41,0.25);
}
.search-box svg { flex-shrink: 0; color: var(--text-muted); }
.search-box input {
  border: none;
  outline: none;
  background: transparent;
  width: 100%;
  font-size: 13px;
  color: var(--text-body);
}
.search-box input::placeholder { color: var(--text-muted); }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: 6px;
  padding: 10px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-title);
  border-radius: 2px;
  transition: all .25s ease;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  z-index: 99;
  flex-direction: column;
  padding: 24px 24px 40px;
  gap: 6px;
  overflow-y: auto;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 17px;
  font-weight: 600;
  padding: 14px 4px;
  border-bottom: 1px solid #f0f0f0;
  color: var(--text-title);
}
.mobile-menu a.active { color: var(--primary); }
.mobile-menu a.mobile-cta {
  margin-top: 24px;
  text-align: center;
  border-bottom: none;
}
.mobile-menu .btn-block { justify-content: center; }

/* ===== 页面头 ===== */
.category-hero {
  background: var(--secondary);
  padding: 52px 0 44px;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.page-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.page-title .c7 { color: var(--accent); background: var(--primary); padding: 0 6px; border-radius: 4px; display: inline-block; }
.lead {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 640px;
  margin-top: 10px;
  line-height: 1.8;
}

/* ===== 通用区块 ===== */
.section { padding: 80px 0; }
.section-secondary { background: var(--secondary); }
.section-head { margin-bottom: 40px; }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.section-tag::before {
  content: '';
  width: 14px;
  height: 4px;
  background: var(--accent);
  display: inline-block;
}
.section-head h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.section-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 8px;
  max-width: 560px;
}

/* ===== 上半部介绍区 ===== */
.intro-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.intro-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 16px;
  padding-top: 8px;
}
.intro-content p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.9;
  margin-bottom: 24px;
}
.check-list li {
  position: relative;
  padding: 10px 0 10px 32px;
  font-size: 14px;
  color: var(--text-body);
  border-bottom: 1px dashed var(--border);
  line-height: 1.8;
}
.check-list li:last-child { border-bottom: none; }
.check-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 16px;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #111;
  font-size: 10px;
  font-weight: 700;
}
.check-list li::after {
  content: '✓';
  position: absolute;
  left: 4px;
  top: 15px;
  width: 16px;
  height: 16px;
  font-size: 10px;
  font-weight: 700;
  color: #111;
  text-align: center;
  line-height: 16px;
}

.intro-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 96px;
}
.intro-side img {
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
}
.contact-card {
  background: var(--primary);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  color: #fff;
}
.contact-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.contact-card p {
  font-size: 13px;
  color: #D1D5DB;
  line-height: 1.7;
  margin-bottom: 18px;
}
.contact-card .btn { background: var(--accent); color: #111; }
.contact-card .btn:hover { background: #fff; }

/* ===== 案例卡片 ===== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.case-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s ease, transform .2s ease;
}
.case-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}
.case-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--secondary);
}
.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}
.case-card:hover .case-img img { transform: scale(1.03); }
.case-body { padding: 20px 22px 24px; }
.case-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 8px;
  line-height: 1.4;
}
.case-body p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.case-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  background: rgba(184,255,41,0.2);
  color: #333;
  padding: 2px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

/* ===== FAQ ===== */
.faq-section .section-head { text-align: center; }
.faq-section .section-head .section-desc { margin-left: auto; margin-right: auto; }
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color .2s;
}
.faq-item[open] { border-color: rgba(11,43,38,0.2); }
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-title);
  cursor: pointer;
  list-style: none;
  line-height: 1.5;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { background: var(--secondary); }
.faq-icon {
  font-size: 22px;
  font-weight: 400;
  color: var(--primary);
  line-height: 1;
  flex-shrink: 0;
  transition: transform .3s ease;
  font-family: var(--font-display);
}
.faq-item[open] .faq-icon { transform: rotate(45deg); }
.faq-answer {
  background: var(--secondary);
  border-left: 4px solid var(--accent);
  padding: 14px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.faq-answer p { margin-bottom: 4px; }

/* ===== CTA ===== */
.cta-section {
  background: var(--primary);
  padding: 80px 0;
  text-align: center;
  color: #fff;
}
.cta-section h2 {
  font-size: 30px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.cta-section p {
  font-size: 15px;
  color: #D1D5DB;
  max-width: 480px;
  margin: 0 auto 32px;
}
.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #111;
  border-top: 3px solid var(--accent);
  color: #9CA3AF;
}
.footer-top { padding: 48px 0 32px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
}
.footer-brand p {
  font-size: 14px;
  margin-top: 12px;
  max-width: 320px;
  color: #9CA3AF;
  line-height: 1.8;
}
.footer-logo {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
}
.footer-logo .c7 { color: var(--accent); }
.footer-h {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.footer-links-col { display: flex; flex-direction: column; gap: 10px; }
.footer-links-col a {
  font-size: 14px;
  color: #9CA3AF;
}
.footer-links-col a:hover { color: var(--accent); }
.footer-contact p {
  font-size: 14px;
  color: #9CA3AF;
  margin-bottom: 8px;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 18px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 12px;
  color: #6B7280;
}

/* ===== 浮动 CTA ===== */
.floating-cta {
  position: fixed;
  right: 40px;
  bottom: 40px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 14px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s;
}
.floating-cta.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.floating-pop {
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lg);
  padding: 20px;
  width: 260px;
  border: 1px solid var(--border);
  display: none;
}
.floating-pop.open { display: block; }
.floating-pop .pop-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 6px;
}
.floating-pop .pop-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.6;
}
.floating-pop .btn { height: 38px; font-size: 13px; }
.floating-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: #111;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all .2s ease;
}
.floating-btn:hover { background: var(--primary); color: var(--accent); transform: scale(1.05); }
.floating-btn:active { transform: scale(0.95); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .main-nav { gap: 16px; }
  .search-box { width: 130px; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .header-inner { height: 56px; }
  .main-nav { display: none; }
  .search-box { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { top: 56px; }
  .category-hero { padding: 36px 0 32px; }
  .page-title { font-size: 26px; }
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 24px; }
  .intro-grid { grid-template-columns: 1fr; gap: 32px; }
  .intro-side { position: static; }
  .cases-grid { grid-template-columns: 1fr; gap: 16px; }
  .cta-section { padding: 56px 0; }
  .cta-section h2 { font-size: 24px; }
  .cta-buttons { flex-direction: column; gap: 12px; align-items: center; }
  .cta-buttons .btn { width: 100%; max-width: 320px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .floating-cta { right: 20px; bottom: 20px; }
  .floating-btn { width: 48px; height: 48px; }
}
@media (max-width: 520px) {
  .container { padding: 0 16px; }
  .logo-text { font-size: 17px; }
  .header-actions .btn-sm { padding: 0 12px; font-size: 12px; height: 36px; }
  .cases-grid { grid-template-columns: 1fr; }
  .case-body { padding: 16px 18px 20px; }
}