/* roulang page: index */
:root {
      --deep-space: #0B0E14;
      --panel-bg: #161B24;
      --gold-highlight: #D9A066;
      --cool-gray: #7B8CA3;
      --warm-bg: #F4F2EF;
      --card-bg: #FFFFFF;
      --text-primary: #1A1E26;
      --text-secondary: #5A6272;
      --text-muted: #949DAD;
      --success: #2D8B6E;
      --alert: #C4554D;
      --border-light: #E8E5DF;
      --shadow-card: 0 1px 3px rgba(11,14,20,0.04), 0 4px 12px rgba(11,14,20,0.03);
      --shadow-hover: 0 8px 24px rgba(11,14,20,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-capsule: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", "PingFang SC", monospace;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-primary);
      line-height: 1.65;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 悬浮胶囊导航 */
    .sky-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 999;
      background: rgba(22, 27, 36, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: var(--radius-capsule);
      padding: 8px 28px;
      display: flex;
      align-items: center;
      gap: 24px;
      box-shadow: 0 4px 20px rgba(11,14,20,0.25);
      border: 1px solid rgba(255,255,255,0.08);
    }

    .nav-logo {
      font-weight: 700;
      font-size: 16px;
      color: #FFFFFF;
      white-space: nowrap;
      letter-spacing: 0.5px;
      margin-right: 8px;
    }

    .nav-divider {
      width: 1px;
      height: 20px;
      background: rgba(255,255,255,0.15);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-links a {
      color: #C8CDD6;
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      transition: color 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--gold-highlight);
    }

    /* 移动端底部导航 */
    @media (max-width: 640px) {
      .sky-nav {
        top: auto;
        bottom: 16px;
        left: 5%;
        right: 5%;
        transform: translateX(0);
        width: 90%;
        justify-content: space-around;
        padding: 10px 16px;
        gap: 4px;
        border-radius: 32px;
      }
      .nav-logo, .nav-divider {
        display: none;
      }
      .nav-links {
        gap: 12px;
        justify-content: center;
        width: 100%;
      }
      .nav-links a {
        font-size: 12px;
      }
    }

    /* Hero */
    #hero {
      padding: 120px 0 80px;
      background: var(--warm-bg);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 50%;
    }

    .hero-visual {
      flex: 1 1 40%;
      position: relative;
      min-height: 380px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(11,14,20,0.2);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(11,14,20,0.55);
      backdrop-filter: blur(1px);
    }

    .badge-float {
      position: absolute;
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(10px);
      border-radius: 12px;
      padding: 12px 18px;
      color: white;
      font-weight: 500;
      font-size: 14px;
      box-shadow: 0 6px 18px rgba(0,0,0,0.25);
      border: 1px solid rgba(255,255,255,0.2);
      white-space: nowrap;
    }

    .badge-1 { top: 15%; right: 10%; }
    .badge-2 { bottom: 20%; left: 8%; }
    .badge-3 { top: 50%; left: 60%; }

    .hero-tag {
      color: var(--gold-highlight);
      font-weight: 600;
      font-size: 13px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 12px;
      display: block;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: 0.02em;
      color: var(--text-primary);
      margin: 0 0 16px;
    }

    .hero-sub {
      font-size: 17px;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 32px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--gold-highlight);
      color: #0B0E14;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: 0.25s ease;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #C48B4E;
      box-shadow: 0 0 20px rgba(217,160,102,0.4);
      color: #0B0E14;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cool-gray);
      color: var(--text-primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: 0.25s ease;
      text-decoration: none;
    }

    .btn-outline:hover {
      border-color: var(--gold-highlight);
      color: var(--gold-highlight);
      background: rgba(217,160,102,0.04);
    }

    @media (max-width: 640px) {
      h1 { font-size: 32px; }
      .hero-grid { flex-direction: column; gap: 30px; }
    }

    /* metrics */
    .section-padding {
      padding: 100px 0;
    }

    @media (max-width: 640px) {
      .section-padding { padding: 60px 0; }
    }

    h2 {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .section-sub {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 40px;
    }

    .metric-card {
      background: transparent;
      padding: 20px 10px;
      text-align: center;
      border-bottom: 2px solid var(--border-light);
    }

    .metric-icon {
      color: var(--gold-highlight);
      font-size: 28px;
      margin-bottom: 10px;
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 56px;
      font-weight: 300;
      letter-spacing: -0.02em;
      color: var(--text-primary);
    }

    .metric-unit {
      font-size: 20px;
      color: var(--cool-gray);
    }

    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* services */
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--gold-highlight);
    }

    .service-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }

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

    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .text-link {
      color: var(--cool-gray);
      text-decoration: none;
      font-weight: 500;
      margin-top: auto;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: 0.2s;
    }

    .text-link:hover {
      color: var(--gold-highlight);
    }

    /* comparison */
    .compare-card {
      background: #F8F7F4;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: 0.2s;
    }

    .compare-card.recommended {
      background: #FFFFFF;
      border: 2px solid var(--gold-highlight);
      position: relative;
    }

    .recommend-tag {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--gold-highlight);
      color: #0B0E14;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
    }

    .price {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 300;
    }

    .feature-list {
      list-style: none;
      padding: 0;
      margin: 20px 0;
    }

    .feature-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .check { color: var(--success); }
    .cross { color: var(--alert); }

    /* FAQ */
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: white;
      border: none;
      width: 100%;
      font-size: 17px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
      color: var(--text-secondary);
    }

    .faq-item.open {
      border-color: var(--gold-highlight);
      border-left: 3px solid var(--gold-highlight);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA dark */
    .dark-cta {
      background: var(--deep-space);
      padding: 80px 0;
    }

    .dark-cta h2 {
      color: white;
    }

    .form-input {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: 8px;
      padding: 14px 16px;
      color: white;
      width: 100%;
      margin-bottom: 16px;
      outline: none;
    }

    .form-input:focus {
      border-color: var(--gold-highlight);
      box-shadow: 0 0 0 3px rgba(217,160,102,0.2);
    }

    /* footer */
    .footer {
      background: var(--panel-bg);
      color: var(--cool-gray);
      padding: 50px 0 20px;
    }

    .footer a {
      color: var(--cool-gray);
      text-decoration: none;
    }

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

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 30px;
      padding-top: 20px;
      font-size: 13px;
      color: var(--text-secondary);
    }

    @media (max-width: 640px) {
      .metric-number { font-size: 40px; }
    }