/* roulang page: index */
:root {
      --primary: #0D7377;
      --primary-dark: #095B5E;
      --accent: #F77F00;
      --accent-light: #FF9A33;
      --bg: #FAFAFA;
      --card: #FFFFFF;
      --text-main: #1A1A2E;
      --text-body: #3A3A4A;
      --text-muted: #6B6B7B;
      --border-light: #E8E8EC;
      --radius-card: 20px;
      --radius-sm: 12px;
      --radius-btn: 30px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --transition: 0.3s ease;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "DIN Alternate", "Arial", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(10px);
      transition: background 0.3s, box-shadow 0.3s;
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 20px rgba(0,0,0,0.06);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-heading);
      letter-spacing: 0.5px;
    }
    .logo i {
      font-size: 26px;
      color: var(--accent);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.25s ease;
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-menu a:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .header-cta {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 15px;
      transition: all 0.25s;
      border: none;
      white-space: nowrap;
    }
    .header-cta:hover {
      background: var(--accent-light);
      box-shadow: 0 6px 18px rgba(247,127,0,0.35);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
    }
    /* 移动底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      border-top: 1px solid var(--border-light);
      height: 64px;
      z-index: 999;
      justify-content: space-around;
      align-items: center;
      padding: 0 12px;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.02);
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
      gap: 4px;
      font-weight: 500;
    }
    .mobile-bottom-nav a i {
      font-size: 20px;
    }
    .mobile-bottom-nav .mobile-cta-float {
      position: absolute;
      right: 16px;
      bottom: 78px;
      background: var(--accent);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      box-shadow: 0 8px 20px rgba(247,127,0,0.4);
      font-size: 22px;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(13,115,119,0.9) 0%, rgba(9,91,94,0.85) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      font-family: var(--font-heading);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 560px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      font-weight: 600;
      border-radius: 30px;
      padding: 14px 32px;
      border: none;
      transition: all 0.25s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      box-shadow: 0 6px 18px rgba(13,115,119,0.35);
      filter: brightness(1.1);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      border-radius: 30px;
      padding: 14px 32px;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: var(--accent);
      color: var(--accent);
    }
    .floating-badge {
      position: absolute;
      right: 40px;
      bottom: 40px;
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 16px 24px;
      display: flex;
      align-items: center;
      gap: 12px;
      color: white;
      font-weight: 500;
    }
    .floating-badge i {
      color: #FFD966;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      font-family: var(--font-heading);
    }
    .section-title p {
      color: var(--text-muted);
      margin-top: 12px;
    }
    /* 核心优势 */
    .features-grid {
      display: flex;
      gap: 32px;
      justify-content: center;
    }
    .feature-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      flex: 1;
      text-align: center;
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-main);
    }
    /* 服务矩阵 2x3 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .service-body {
      padding: 24px;
    }
    .service-body h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 12px 0;
    }
    .tag {
      background: rgba(13,115,119,0.08);
      color: var(--primary);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 500;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 8px;
    }
    /* 数据带 */
    .stats-band {
      background: var(--primary-dark);
      padding: 64px 0;
      color: white;
      display: flex;
      justify-content: center;
      gap: 64px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: relative;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
      font-size: 20px;
    }
    .step-line {
      position: absolute;
      top: 24px;
      left: 70%;
      width: 60%;
      height: 2px;
      background: linear-gradient(to right, var(--primary), var(--accent));
      z-index: -1;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      color: var(--text-main);
    }
    .faq-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      border: 2px solid var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      transition: 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #4A4A5A;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.active .faq-icon {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .btn-large {
      padding: 16px 40px;
      font-size: 18px;
      background: white;
      color: var(--primary);
      border-radius: 30px;
      font-weight: 700;
      margin-top: 24px;
    }
    /* 页脚 */
    .site-footer {
      background: #1A1A2E;
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      text-align: center;
      margin-top: 40px;
      color: rgba(255,255,255,0.5);
    }
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .menu-toggle { display: block; }
      .mobile-bottom-nav { display: flex; }
      .hero h1 { font-size: 32px; }
      .features-grid { flex-direction: column; }
      .service-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 24px; }
      .step-line { display: none; }
      .stats-band { gap: 24px; }
      section { padding: 64px 0; }
    }