/* roulang page: index */
:root {
      --primary: #0B1E3A;
      --primary-light: #1A3350;
      --accent-green: #00E5A0;
      --accent-orange: #FF6B35;
      --bg: #F5F7FA;
      --white: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #5F6B7A;
      --border-light: #E9ECF0;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
      --transition: 0.3s ease;
      --max-width: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-green);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--accent-green);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-green);
      transition: width var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--accent-orange);
      color: white !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      transition: background var(--transition), box-shadow var(--transition);
    }
    .btn-nav:hover {
      background: #E55A2B;
      box-shadow: 0 4px 14px rgba(255,107,53,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      right: 0;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: rgba(11,30,58,0.95);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 28px;
      z-index: 1001;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
    }
    .mobile-menu .close-btn {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B1E3A 0%, #1A3350 100%);
      color: white;
      padding: 140px 0 100px;
      margin-top: var(--nav-height);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 480px;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-text p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      border: none;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
    }
    .btn-primary:hover {
      background: #E55A2B;
      box-shadow: 0 8px 22px rgba(255,107,53,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-visual {
      flex: 1 1 400px;
      position: relative;
    }
    .data-stream {
      width: 100%;
      height: 300px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      opacity: 0.9;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      position: relative;
      overflow: hidden;
    }
    .stream-line {
      position: absolute;
      bottom: 40px;
      left: 10%;
      width: 80%;
      height: 3px;
      background: linear-gradient(90deg, #00E5A0, #FF6B35);
      animation: pulseLine 2s infinite;
    }
    @keyframes pulseLine {
      0% { opacity: 0.6; transform: scaleX(0.95); }
      50% { opacity: 1; transform: scaleX(1); }
      100% { opacity: 0.6; transform: scaleX(0.95); }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
    }
    .section-title p {
      color: var(--text-secondary);
      margin-top: 12px;
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, #00E5A0, #00C48A);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: white;
      font-size: 28px;
      transition: transform 0.3s;
    }
    .feature-card:hover .icon-circle {
      transform: scale(1.1);
    }
    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 14px;
    }

    /* 场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .scenario-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-6px);
    }
    .scenario-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .scenario-content {
      padding: 24px;
    }

    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      flex: 0 0 340px;
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
    }
    .case-logo {
      width: 80px;
      height: 80px;
      background: #f0f4fa;
      border-radius: 16px;
      margin-bottom: 16px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
    }
    .case-stat {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(105deg, #0B1E3A 0%, #123456 100%);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .email-input {
      display: flex;
      max-width: 480px;
      margin: 30px auto 0;
      gap: 12px;
    }
    .email-input input {
      flex: 1;
      padding: 14px 20px;
      border-radius: 30px;
      border: none;
      outline: none;
    }

    /* Footer */
    .footer {
      background: var(--primary);
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .features-grid, .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu { display: flex; }
      .hero-content { flex-direction: column; }
      .hero-text h1 { font-size: 32px; }
      .features-grid, .scenarios-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 80px 0; }
      .cases-scroll { flex-wrap: nowrap; }
    }