/* roulang page: index */
:root {
      --primary-deep: #0A1A3F;
      --primary-mid: #1B3A6B;
      --accent-blue: #4E6EF2;
      --functional-green: #00B578;
      --warning-orange: #FF9F0A;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --border-light: #E5E8EF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 24px;
      --shadow-sm: 0 2px 8px rgba(10,26,63,0.08);
      --shadow-md: 0 8px 24px rgba(10,26,63,0.15);
      --shadow-glow: 0 0 20px rgba(78,110,242,0.5);
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", 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-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }

    .nav.scrolled {
      background: rgba(10, 26, 63, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
      border-bottom: 1px solid rgba(255,255,255,0.15);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent-blue);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

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

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

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 10px;
    }

    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A1A3F 0%, #1B3A6B 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.1;
      pointer-events: none;
    }

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

    .hero-left {
      flex: 1;
    }

    .hero h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.3;
      color: white;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      margin-bottom: 40px;
      line-height: 1.7;
    }

    .btn-primary {
      background: var(--accent-blue);
      color: white;
      border: none;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      box-shadow: var(--shadow-glow);
      transition: var(--transition);
      display: inline-block;
    }

    .btn-primary:hover {
      background: #0D224A;
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(78,110,242,0.5);
    }

    .hero-right {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .metric-card {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.25);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .metric-label {
      color: rgba(255,255,255,0.7);
      font-size: 16px;
    }

    .metric-value {
      font-size: 32px;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
    }

    .metric-trend {
      color: var(--functional-green);
      font-size: 14px;
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

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

    .section-title h2 {
      font-size: 32px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }

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

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.3);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-blue);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(78,110,242,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent-blue);
      font-size: 24px;
    }

    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
      color: var(--primary-deep);
    }

    .feature-card p {
      color: var(--text-secondary);
      font-size: 16px;
    }

    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 40px;
    }

    .service-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }

    .service-icon {
      width: 56px;
      height: 56px;
      background: #E8EDFF;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-blue);
      font-size: 28px;
      flex-shrink: 0;
    }

    .service-text h3 {
      font-size: 22px;
      margin-bottom: 10px;
    }

    .service-text p {
      color: var(--text-secondary);
    }

    /* 数据看板 */
    .dashboard {
      background: var(--primary-deep);
      color: white;
      border-radius: 32px;
      padding: 48px;
      position: relative;
      overflow: hidden;
    }

    .dashboard::after {
      content: '';
      position: absolute;
      right: -40px;
      bottom: -40px;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(78,110,242,0.2) 0%, transparent 70%);
    }

    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      position: relative;
      z-index: 2;
    }

    .stat-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: 16px;
      padding: 28px;
      border: 1px solid rgba(255,255,255,0.15);
    }

    .stat-number {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .progress-bar {
      height: 8px;
      background: rgba(255,255,255,0.2);
      border-radius: 4px;
      margin: 16px 0;
      overflow: hidden;
    }

    .progress-fill {
      height: 100%;
      background: var(--accent-blue);
      border-radius: 4px;
      width: 0%;
      transition: width 1.2s ease;
    }

    /* 对比卡片 */
    .compare-row {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .compare-card {
      flex: 1;
      border-radius: var(--radius-card);
      padding: 32px;
      background: white;
      box-shadow: var(--shadow-sm);
    }

    .compare-card.before {
      background: #F5F5F5;
      border-left: 4px solid #ccc;
    }

    .compare-card.after {
      background: white;
      border-left: 4px solid var(--functional-green);
    }

    .compare-tag {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 20px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .tag-bad {
      background: #FFE0E0;
      color: #C00;
    }

    .tag-good {
      background: #E0FFE9;
      color: #007A3D;
    }

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

    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
      border: none;
      width: 100%;
      font-size: 18px;
      text-align: left;
    }

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

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

    .faq-item.active .faq-question {
      color: var(--accent-blue);
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #0A1A3F, #1B3A6B);
      border-radius: 32px;
      padding: 64px;
      text-align: center;
    }

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

    .cta-form input {
      padding: 16px 24px;
      border-radius: 32px;
      border: none;
      background: white;
      min-width: 200px;
    }

    .btn-submit {
      background: var(--accent-blue);
      color: white;
      border: none;
      padding: 16px 32px;
      border-radius: 32px;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(78,110,242,0.5);
    }

    footer {
      background: #0A1A3F;
      color: white;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }

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

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .features-grid, .service-grid, .dashboard-grid, .compare-row { grid-template-columns: 1fr; flex-direction: column; }
      .hero h1 { font-size: 36px; }
      .cta-band { padding: 32px; }
    }