/* roulang page: index */
:root {
      --primary: #1A1F3B;
      --secondary: #F97316;
      --gradient-start: #1A1F3B;
      --gradient-end: #F97316;
      --bg-light: #F8F9FC;
      --card-bg: #FFFFFF;
      --border-light: #E8ECF1;
      --text-dark: #0F1221;
      --text-body: #4A4F5C;
      --text-muted: #7B808C;
      --success: #10B981;
      --radius-lg: 16px;
      --radius-md: 10px;
      --radius-sm: 8px;
      --shadow-sm: 0 2px 12px rgba(26,31,59,0.06);
      --shadow-hover: 0 8px 30px rgba(26,31,59,0.12);
      --transition: 0.3s ease;
      --container-max: 1200px;
      --nav-height: 72px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      background: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--nav-height);
    }
    h1, h2, h3, h4, .data-number {
      font-weight: 700;
      color: var(--text-dark);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      transition: var(--transition);
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(26,31,59,0.06);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .site-header.scrolled {
      background: #FFFFFF;
      box-shadow: 0 2px 16px rgba(26,31,59,0.08);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 600;
      font-size: 15px;
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--secondary);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--secondary);
      border-radius: 2px;
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-md);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(249,115,22,0.3);
      white-space: nowrap;
    }
    .nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 6px 20px rgba(249,115,22,0.45);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--primary);
      background: transparent;
      border: none;
    }
    /* 移动端菜单 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        gap: 0;
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        align-items: flex-start;
      }
      .nav-links.open {
        max-height: 500px;
      }
      .nav-links a {
        padding: 16px 24px;
        width: 100%;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links a.nav-cta {
        margin: 12px 24px;
        width: calc(100% - 48px);
        text-align: center;
        border-radius: var(--radius-md);
      }
      .hamburger {
        display: block;
      }
      .header-inner {
        padding: 0 16px;
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 50px 0;
      }
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--secondary);
      border-radius: 2px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
      max-width: 600px;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1F3B 0%, #2D3561 100%);
      position: relative;
      overflow: hidden;
      color: #fff;
      padding: 100px 0;
      display: flex;
      align-items: center;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(rgba(255,255,255,0.06) 1px, transparent 1px);
      background-size: 24px 24px;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero h1 {
      font-size: 44px;
      color: #fff;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--secondary);
    }
    .hero p {
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-image {
      flex: 1 1 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      border: 1px solid rgba(255,255,255,0.2);
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      border: none;
      transition: 0.3s;
      box-shadow: 0 4px 14px rgba(249,115,22,0.4);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 22px rgba(249,115,22,0.55);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 12px 30px;
      border-radius: var(--radius-md);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(249,115,22,0.1);
    }
    @media (max-width: 768px) {
      .hero h1 { font-size: 32px; }
      .hero-image { min-height: 240px; }
      .btn-group .btn-primary, .btn-group .btn-outline { width: 100%; text-align: center; }
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(249,115,22,0.3);
    }
    .icon-box {
      width: 64px;
      height: 64px;
      background: rgba(249,115,22,0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--secondary);
      font-size: 28px;
      margin-bottom: 20px;
    }
    .badge {
      background: rgba(249,115,22,0.1);
      color: var(--secondary);
      font-weight: 600;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
    }
    .data-highlight {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
      font-family: 'Inter', system-ui;
    }
    .data-label {
      color: var(--text-muted);
      font-size: 15px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) { .grid-3 { grid-template-columns: repeat(2,1fr); } }
    @media (max-width: 640px) { .grid-3 { grid-template-columns: 1fr; } }
    /* FAQ */
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: #fff;
      transition: 0.2s;
    }
    .faq-question:hover { color: var(--secondary); }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F9FAFB;
    }
    .faq-answer p { padding: 0 24px 20px; margin: 0; }
    .faq-item.active .faq-answer { max-height: 200px; }
    /* CTA 区 */
    .cta-section {
      background: linear-gradient(135deg, #1A1F3B, #F97316);
      color: #fff;
      text-align: center;
      border-radius: 0;
    }
    .footer {
      background: #1A1F3B;
      color: #B0B8C8;
      padding: 60px 0 30px;
    }
    .footer a { color: #B0B8C8; }
    .footer a:hover { color: var(--secondary); }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }