/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent-red: #FF4655;
      --accent-cyan: #00E5FF;
      --bg-light: #F5F6FA;
      --bg-white: #FFFFFF;
      --bg-off: #F0F2F8;
      --text-main: #1A1D2E;
      --text-muted: #5A5D6E;
      --text-light: #8A8D9E;
      --shadow-card: 0 8px 30px rgba(10,14,39,0.06);
      --shadow-hover: 0 16px 40px rgba(10,14,39,0.12);
      --radius-lg: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --radius-badge: 20px;
      --radius-dock: 40px;
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 浮动Dock导航 */
    .dock-nav {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 720px;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-dock);
      padding: 10px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
      z-index: 1000;
      box-shadow: 0 4px 24px rgba(0,0,0,0.25);
      border: 1px solid rgba(255,255,255,0.1);
    }
    .dock-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .dock-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .dock-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .dock-links a:hover {
      color: var(--accent-cyan);
    }
    .dock-cta {
      background: var(--accent-red);
      color: white !important;
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      transition: 0.2s;
      box-shadow: 0 4px 12px rgba(255,70,85,0.4);
    }
    .dock-cta:hover {
      background: #E63241;
      transform: scale(1.03);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A0E27 0%, #00E5FF 100%);
      position: relative;
      overflow: hidden;
      min-height: 85vh;
      display: flex;
      align-items: center;
      padding-top: 90px;
    }
    .hero-grid {
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none"><path d="M0 0L100 100M100 0L0 100" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></svg>');
      background-size: 40px 40px;
      position: absolute;
      inset: 0;
      opacity: 0.4;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
    }
    .hero-left {
      flex: 1 1 500px;
      color: white;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: 0.2s;
      display: inline-block;
      box-shadow: 0 8px 18px rgba(255,70,85,0.4);
    }
    .btn-primary:hover {
      background: #E63241;
      transform: scale(1.03);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    .hero-badges {
      flex: 0 0 280px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .badge-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 18px 20px;
      color: white;
      display: flex;
      align-items: center;
      gap: 16px;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .badge-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--accent-cyan);
      text-shadow: 0 0 12px rgba(0,229,255,0.6);
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .section-desc {
      color: var(--text-muted);
      margin-bottom: 48px;
    }
    .bg-white {
      background: var(--bg-white);
    }
    .bg-off {
      background: var(--bg-off);
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .metric-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      border-top: 4px solid var(--accent-cyan);
    }
    .metric-num {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent-cyan);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    /* 核心优势 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .adv-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
      border: 2px solid transparent;
    }
    .adv-card:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--accent-red);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      margin-bottom: 20px;
      transition: 0.2s;
    }
    .adv-card:hover .icon-circle {
      background: var(--accent-cyan);
    }
    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
      overflow: hidden;
      border-bottom: 4px solid transparent;
      transition: 0.2s;
    }
    .service-card:hover {
      border-bottom-color: var(--accent-red);
    }
    .service-tag {
      color: var(--accent-cyan);
      font-weight: 600;
      margin: 12px 0;
    }
    /* 对比区 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .after-card {
      background: rgba(0,229,255,0.02);
      border: 1px solid rgba(0,229,255,0.25);
    }
    .percent-badge {
      background: var(--accent-cyan);
      color: #0A0E27;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 14px;
    }
    /* FAQ */
    .faq-group {
      margin-bottom: 40px;
    }
    .accordion-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      overflow: hidden;
    }
    .accordion-btn {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      padding: 18px 24px;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-item.active {
      border-left: 4px solid var(--accent-cyan);
    }
    /* 表单 */
    .cta-section {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      color: white;
    }
    .form-inline {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
    }
    .form-inline input {
      flex: 1 1 200px;
      padding: 14px 18px;
      border-radius: var(--radius-input);
      border: none;
      background: white;
    }
    .footer {
      background: #0A0E27;
      color: #B0B3C1;
      padding: 50px 0 30px;
    }
    .footer a:hover {
      color: var(--accent-cyan);
    }
    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .cards-grid { grid-template-columns: repeat(2,1fr); }
      .service-grid { grid-template-columns: 1fr; }
      .dock-links { gap: 16px; }
    }
    @media (max-width: 640px) {
      .dock-nav {
        width: 94%;
        padding: 10px 20px;
        left: 3%;
        transform: none;
      }
      .dock-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero h1 { font-size: 36px; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .cards-grid, .service-grid, .compare-row { grid-template-columns: 1fr; }
      .form-inline { flex-direction: column; }
    }