/* roulang page: index */
:root {
      --primary: #0A3D2E;
      --primary-hover: #0E5240;
      --accent: #E8B730;
      --accent-hover: #F0C94D;
      --bg: #F7F9F6;
      --deep-bg: #06251C;
      --text: #1A2E29;
      --text-secondary: #5B6F6A;
      --border-light: #E0E8E4;
      --white: #FFFFFF;
      --radius-card-lg: 20px;
      --radius-card-md: 16px;
      --radius-btn: 12px;
      --radius-badge: 16px;
      --shadow-sm: 0 4px 20px rgba(10,61,46,0.06);
      --shadow-hover: 0 12px 32px rgba(10,61,46,0.12);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-weight: 400;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--white);
      font-weight: 700;
      font-size: 1.2rem;
    }

    .nav-menu {
      display: flex;
      list-style: none;
      gap: 32px;
      align-items: center;
    }

    .nav-menu a {
      text-decoration: none;
      color: var(--text);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 6px;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent);
      border-radius: 3px;
      transition: width 0.2s;
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 2px 8px rgba(10,61,46,0.15);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(10,61,46,0.25);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.25s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      color: var(--primary);
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 12px rgba(232,183,48,0.3);
    }

    .btn-accent:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
    }

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

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(180deg, #FFFFFF 0%, #F0F5F2 100%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-content {
      flex: 1 1 45%;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 3.2rem;
      color: var(--text);
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .hero-badges {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    .badge-item {
      background: var(--white);
      border-radius: var(--radius-badge);
      padding: 18px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      min-width: 120px;
      transition: transform 0.25s;
    }

    .badge-item:hover {
      transform: translateY(-4px);
    }

    .badge-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 2rem;
      color: var(--accent);
      display: block;
    }

    .badge-label {
      font-size: 0.8rem;
      color: var(--text-secondary);
      margin-top: 4px;
    }

    .hero-visual {
      flex: 1 1 55%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      min-height: 420px;
      position: relative;
      box-shadow: 0 20px 40px rgba(10,61,46,0.15);
    }

    .hero-visual::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(10,61,46,0.45) 0%, rgba(6,37,28,0.2) 100%);
      border-radius: 32px;
    }

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

    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 2.4rem;
      color: var(--text);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card-lg);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    .feature-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }

    /* 功能分组 */
    .functional-group {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }

    .functional-group.reverse {
      flex-direction: row-reverse;
    }

    .func-text {
      flex: 1;
    }

    .func-text h3 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.8rem;
      margin-bottom: 16px;
    }

    .func-list {
      list-style: none;
    }

    .func-list li {
      margin-bottom: 10px;
      color: var(--text);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .func-list li::before {
      content: '✓';
      color: var(--primary);
      font-weight: bold;
    }

    .func-image {
      flex: 1;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 300px;
      box-shadow: var(--shadow-sm);
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scenario-card {
      background: var(--white);
      border-radius: var(--radius-card-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s;
    }

    .scenario-card:hover {
      transform: translateY(-6px);
    }

    .scenario-img {
      height: 180px;
      background: url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
    }

    .scenario-body {
      padding: 24px;
    }

    .scenario-body h4 {
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 8px;
    }

    .scenario-body p {
      color: var(--text-secondary);
      margin-bottom: 12px;
      font-size: 0.9rem;
    }

    .scenario-link {
      color: var(--primary);
      font-weight: 600;
      text-decoration: none;
    }

    /* 数据墙 */
    .dark-bg {
      background: var(--deep-bg);
      color: white;
      border-radius: 32px;
      padding: 60px 40px;
    }

    .data-wall {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 40px;
    }

    .data-card {
      background: rgba(255,255,255,0.08);
      border-radius: var(--radius-badge);
      padding: 24px;
      text-align: center;
      min-width: 150px;
    }

    .data-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 2.5rem;
      color: var(--accent);
    }

    .case-cards {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 10px;
    }

    .case-item {
      background: rgba(255,255,255,0.1);
      border-radius: var(--radius-card-md);
      padding: 24px;
      min-width: 250px;
      backdrop-filter: blur(5px);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: var(--white);
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: #F7F9F6;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }

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

    /* CTA */
    .cta-section {
      text-align: center;
      background: linear-gradient(135deg, var(--primary) 0%, #06251C 100%);
      color: white;
      border-radius: 48px;
      padding: 70px 20px;
      margin: 60px 0;
    }

    .cta-trust {
      margin-top: 20px;
      font-size: 0.85rem;
      opacity: 0.8;
    }

    /* Footer */
    .footer {
      background: var(--deep-bg);
      color: #B7C9C3;
      padding: 60px 0 30px;
    }

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

    .footer h4 {
      color: white;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer a {
      color: #B7C9C3;
      text-decoration: none;
      display: block;
      margin-bottom: 8px;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
      }
      .features-grid, .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .functional-group {
        flex-direction: column;
      }
      .functional-group.reverse {
        flex-direction: column;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .features-grid, .scenarios-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
    }