/* roulang page: index */
:root {
      --primary: #0D7377;
      --primary-light: #14A3A8;
      --primary-gradient: linear-gradient(135deg, #0D7377 0%, #14A3A8 100%);
      --accent: #FF6B35;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --dark-bg: #0A2E36;
      --text-main: #1A1A2E;
      --text-secondary: #5A5A72;
      --text-muted: #9090A0;
      --success: #2ED573;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --shadow-card: 0 8px 30px rgba(13, 115, 119, 0.08);
      --shadow-hover: 0 20px 40px rgba(13, 115, 119, 0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      --font-data: "DIN Alternate", "PingFang SC", sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      padding: 16px 0;
      transition: var(--transition);
      background: transparent;
    }

    .navbar.scrolled {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
      padding: 12px 0;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 24px;
      color: white;
      transition: var(--transition);
    }

    .navbar.scrolled .logo {
      color: var(--text-main);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      font-weight: 500;
      color: rgba(255, 255, 255, 0.9);
      transition: var(--transition);
    }

    .navbar.scrolled .nav-links {
      color: var(--text-secondary);
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 8px 18px rgba(13, 115, 119, 0.25);
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(13, 115, 119, 0.35);
      filter: brightness(1.05);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 11px 28px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: rgba(13, 115, 119, 0.06);
      border-color: var(--primary-light);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 4px;
      transition: var(--transition);
    }

    .navbar.scrolled .hamburger span {
      background: var(--text-main);
    }

    /* Hero */
    .hero {
      background: var(--primary-gradient);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 120px;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 120"><path fill="%23F7F9FC" d="M0,60 C360,120 1080,0 1440,60 L1440,120 L0,120 Z"/></svg>') no-repeat bottom;
      background-size: cover;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-content {
      flex: 1 1 50%;
      color: white;
    }

    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero h1 span {
      background: linear-gradient(to right, #ffffff, #e0f0f0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255, 255, 255, 0.85);
      max-width: 480px;
      margin-bottom: 32px;
    }

    .badge-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }

    .badge {
      background: rgba(255, 255, 255, 0.15);
      backdrop-filter: blur(10px);
      padding: 8px 18px;
      border-radius: 40px;
      font-size: 14px;
      font-weight: 500;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-image {
      flex: 1 1 50%;
      background: rgba(255,255,255,0.08);
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 30px 50px rgba(0,0,0,0.2);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .cta-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }

    .section-title h2 {
      font-size: 38px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-title p {
      color: var(--text-secondary);
      font-size: 18px;
    }

    /* 数据看板 */
    .data-panel {
      background: var(--dark-bg);
      color: white;
      border-radius: var(--radius-lg);
      padding: 48px 40px;
      margin-top: -60px;
      position: relative;
      z-index: 5;
      box-shadow: 0 25px 45px rgba(0,0,0,0.15);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }

    .stat-item .number {
      font-family: var(--font-data);
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, #ffffff, #b3e0e2);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      color: rgba(255,255,255,0.7);
      font-size: 15px;
      margin-top: 6px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      padding: 36px 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid rgba(13,115,119,0.05);
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .card-icon {
      width: 64px;
      height: 64px;
      background: rgba(13,115,119,0.08);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--primary);
      font-size: 28px;
    }

    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 18px;
      border-bottom: 1px solid transparent;
    }

    .text-link:hover {
      border-bottom: 1px solid var(--primary);
    }

    /* 对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      padding: 36px;
      border-radius: var(--radius-md);
    }

    .compare-before {
      background: #FFF5F5;
    }

    .compare-after {
      background: #F0FAFA;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
      position: relative;
    }

    .step {
      flex: 1;
      position: relative;
    }

    .step-num {
      width: 56px;
      height: 56px;
      background: var(--primary-gradient);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 22px;
      margin: 0 auto 16px;
    }

    /* 案例 */
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      display: flex;
      overflow: hidden;
      margin-bottom: 24px;
    }

    .case-img {
      width: 280px;
      background: #eef2f6;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 28px 20px;
      display: none;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: var(--dark-bg);
      color: white;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 992px) {
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .hero .container { flex-direction: column; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .services-grid, .stats-grid { grid-template-columns: 1fr; }
      .compare-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .case-card { flex-direction: column; }
    }