/* roulang page: index */
:root {
      --primary: #0F766E;
      --primary-dark: #042F2E;
      --primary-light: #14B8A6;
      --accent: #EA580C;
      --accent-hover: #C2410C;
      --bg-base: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: rgba(226, 232, 240, 0.85);
      --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --transition: all 0.28s ease-in-out;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }

    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }

    /* 顶部元数据通栏 */
    .meta-topbar {
      background-color: var(--primary-dark);
      color: #99F6E4;
      font-size: 0.84rem;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .meta-topbar a { color: #99F6E4; }
    .meta-topbar a:hover { color: #FFFFFF; }

    /* 主导航 */
    .site-nav {
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      padding: 14px 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .brand-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      color: #FFFFFF;
      border-radius: 9px;
      font-weight: bold;
      font-size: 1.15rem;
    }
    .nav-links {
      display: flex;
      gap: 22px;
      list-style: none;
      margin: 0;
      padding: 0;
      font-weight: 500;
      font-size: 0.95rem;
    }
    .nav-links a { color: var(--text-main); }
    .nav-links a:hover { color: var(--primary); }

    /* 通用按钮 */
    .btn-brand-accent {
      background-color: var(--accent);
      color: #fff !important;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 10px rgba(234, 88, 12, 0.25);
    }
    .btn-brand-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(234, 88, 12, 0.35);
    }
    .btn-brand-outline {
      border: 1px solid var(--primary);
      color: var(--primary) !important;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      background: transparent;
    }
    .btn-brand-outline:hover {
      background: rgba(15, 118, 110, 0.08);
      transform: translateY(-2px);
    }

    /* 板块结构基类 */
    .content-section {
      padding: 85px 0;
      position: relative;
    }
    .section-title-wrap {
      margin-bottom: 48px;
    }
    .section-pill {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      padding: 4px 14px;
      border-radius: 30px;
      background: rgba(15, 118, 110, 0.1);
      color: var(--primary);
      margin-bottom: 12px;
    }
    .section-heading {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 0;
    }

    /* 首屏看板：全宽视频背景覆盖版 */
    .hero-video-stage {
      position: relative;
      min-height: 640px;
      display: flex;
      align-items: center;
      background-image: linear-gradient(135deg, rgba(4, 47, 46, 0.94), rgba(15, 118, 110, 0.88)), url('/assets/images/35432cbaeb554756.jpg');
      background-size: cover;
      background-position: center;
      color: #FFFFFF;
      padding: 90px 0;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.14);
      backdrop-filter: blur(8px);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.85rem;
      border: 1px solid rgba(255,255,255,0.2);
      margin-bottom: 22px;
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.22;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-summary {
      font-size: 1.12rem;
      line-height: 1.8;
      color: #CCFBF1;
      max-width: 660px;
      margin-bottom: 32px;
    }
    .play-video-box {
      border: 2px dashed rgba(255,255,255,0.3);
      border-radius: var(--radius-lg);
      padding: 30px;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(10px);
      text-align: center;
    }
    .video-icon-circle {
      width: 76px;
      height: 76px;
      border-radius: 50%;
      background: var(--accent);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      box-shadow: 0 0 0 10px rgba(234,88,12,0.25);
    }

    /* 指标卡片 */
    .metric-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      text-align: center;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .metric-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--hover-shadow);
    }
    .metric-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-sub {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 卡片网格 */
    .feature-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      height: 100%;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--hover-shadow);
      border-color: var(--primary-light);
    }
    .feature-icon-bar {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: rgba(15, 118, 110, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.3rem;
      margin-bottom: 20px;
    }
    .feature-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 12px;
    }
    .feature-text {
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.65;
      margin-bottom: 0;
    }

    /* 深色对比区 */
    .dark-section {
      background-color: var(--primary-dark);
      color: #FFFFFF;
    }
    .dark-section .section-heading { color: #FFFFFF; }
    .dark-section .section-desc { color: #99F6E4; }
    .compare-box {
      border-radius: var(--radius-md);
      padding: 32px;
      height: 100%;
    }
    .compare-bad {
      background: rgba(239, 68, 68, 0.08);
      border: 1px solid rgba(239, 68, 68, 0.25);
    }
    .compare-good {
      background: rgba(16, 185, 129, 0.1);
      border: 1px solid rgba(16, 185, 129, 0.35);
    }

    /* 套件卡片 */
    .pricing-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 36px 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent);
      position: relative;
    }
    .pricing-badge-popular {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--accent);
      color: #fff;
      font-size: 0.78rem;
      font-weight: bold;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* 时间线里程碑 */
    .timeline-step {
      position: relative;
      padding-left: 32px;
      border-left: 2px solid rgba(15, 118, 110, 0.25);
      margin-bottom: 30px;
    }
    .timeline-step::before {
      content: '';
      position: absolute;
      left: -9px;
      top: 4px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--primary);
      border: 3px solid #F8FAFC;
    }

    /* 手风琴样式覆盖 */
    .accordion-button:not(.collapsed) {
      color: var(--primary-dark);
      background-color: rgba(15, 118, 110, 0.08);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(15, 118, 110, 0.2);
    }
    .accordion-item {
      border: 1px solid var(--border-color);
      margin-bottom: 12px;
      border-radius: var(--radius-sm) !important;
      overflow: hidden;
    }

    /* 表单区块 */
    .form-box-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 44px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
    }

    /* 页脚 */
    .site-footer {
      background-color: #031D1C;
      color: #94A3B8;
      padding: 70px 0 30px;
      font-size: 0.92rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .site-footer a { color: #CBD5E1; }
    .site-footer a:hover { color: #FFFFFF; }
    .footer-title {
      color: #FFFFFF;
      font-weight: 700;
      margin-bottom: 20px;
      font-size: 1.05rem;
    }

    @media (max-width: 991px) {
      .hero-h1 { font-size: 2.2rem; }
      .content-section { padding: 60px 0; }
      .form-box-card { padding: 26px; }
      .nav-links { display: none; }
    }