/* roulang page: index */
:root {
      --primary: #E8480C;
      --primary-deep: #C93A08;
      --secondary: #1A1D29;
      --bg: #F5F3EF;
      --accent: #0EA5E9;
      --success: #10B981;
      --gray-50: #F9FAFB;
      --gray-100: #F3F4F6;
      --gray-200: #E5E7EB;
      --gray-300: #D1D5DB;
      --gray-400: #9CA3AF;
      --gray-500: #6B7280;
      --gray-600: #4B5563;
      --gray-700: #374151;
      --gray-800: #1F2937;
      --text-main: #1A1D29;
      --text-body: #374151;
      --text-light: #6B7280;
      --white: #FFFFFF;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --max-width: 1280px;
      --nav-height: 64px;
      --section-gap: 120px;
      --transition: 0.2s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      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: color var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border-radius: var(--radius-md);
      transition: all var(--transition);
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      z-index: 100;
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--text-main);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      color: var(--primary);
      font-size: 28px;
      line-height: 1;
    }

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

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--gray-700);
      position: relative;
      padding: 8px 0;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }

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

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      width: 28px;
      height: 20px;
      justify-content: center;
    }

    .hamburger span {
      display: block;
      width: 100%;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: all 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      padding: 24px;
      box-shadow: var(--shadow-md);
      flex-direction: column;
      gap: 20px;
      z-index: 99;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 1px solid var(--gray-200);
    }

    /* 板块基础 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-light);
      margin-bottom: 40px;
      max-width: 600px;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background-color: var(--bg);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
      text-align: center;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 18px;
      color: var(--gray-700);
      margin-bottom: 32px;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      padding: 14px 36px;
      font-size: 16px;
      border-radius: var(--radius-md);
      box-shadow: 0 4px 12px rgba(232,72,12,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      transform: translateY(-2px);
      box-shadow: 0 12px 20px rgba(232,72,12,0.25);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 13px 32px;
    }

    .btn-outline:hover {
      background: rgba(232,72,12,0.08);
    }

    .btn-white-outline {
      border: 2px solid var(--white);
      color: var(--white);
      background: transparent;
      padding: 13px 32px;
    }

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

    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 32px;
      font-size: 14px;
      color: var(--gray-500);
      flex-wrap: wrap;
    }

    .trust-badges i {
      color: var(--accent);
      margin-right: 6px;
    }

    /* 核心优势 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 24px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--gray-200);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .feature-card.wide {
      grid-column: span 2;
      flex-direction: row;
      align-items: center;
      gap: 32px;
    }

    .feature-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .feature-card.wide .feature-icon {
      margin-bottom: 0;
      font-size: 48px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .feature-card p {
      color: var(--text-body);
      font-size: 15px;
      margin-bottom: 12px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .text-link:hover {
      text-decoration: underline;
    }

    /* 功能分组 */
    .capability-row {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .capability-row.reverse {
      flex-direction: row-reverse;
    }

    .capability-text {
      flex: 1;
    }

    .capability-text h2 {
      margin-bottom: 24px;
    }

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

    .capability-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
      color: var(--text-body);
    }

    .capability-list i {
      color: var(--success);
      font-size: 18px;
    }

    .capability-image {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    /* 场景卡片 */
    .scenario-grid {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .scenario-card {
      display: flex;
      background: #FAFAFA;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .scenario-card:hover {
      box-shadow: var(--shadow-md);
    }

    .scenario-img {
      width: 200px;
      flex-shrink: 0;
      background: var(--gray-100);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .scenario-img img {
      object-fit: cover;
      height: 100%;
    }

    .scenario-content {
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .scenario-content h3 {
      font-weight: 600;
      font-size: 20px;
      margin-bottom: 8px;
    }

    /* 数据区 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      text-align: center;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 700;
      font-family: var(--font-number);
      color: var(--accent);
      line-height: 1.2;
    }

    .testimonial-cards {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .testimonial {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 24px;
      display: flex;
      gap: 16px;
      align-items: center;
    }

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

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid var(--gray-200);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: var(--white);
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-body);
      display: none;
      background: var(--gray-50);
    }

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

    /* CTA 深色区 */
    .cta-dark {
      background: var(--secondary);
      color: var(--white);
      text-align: center;
      padding: 80px 0;
      border-radius: 0;
    }

    .cta-dark h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .button-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    /* Footer */
    .footer {
      background: var(--secondary);
      color: var(--gray-400);
      padding: 60px 0 30px;
    }

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

    .footer a:hover {
      color: var(--white);
    }

    @media (max-width: 1024px) {
      .capability-row {
        flex-direction: column;
        gap: 32px;
      }
      .capability-row.reverse {
        flex-direction: column;
      }
      .testimonial-cards {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero h1 {
        font-size: 32px;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-card.wide {
        grid-column: span 1;
        flex-direction: column;
      }
      .scenario-card {
        flex-direction: column;
      }
      .scenario-img {
        width: 100%;
        height: 180px;
      }
      .stats-row {
        gap: 24px;
      }
    }