/* roulang page: index */
:root {
      --primary: #1A0A2E;
      --accent: #00E5A0;
      --emphasize: #FF6B35;
      --bg-deep: #0D0B1E;
      --card-bg: #16132B;
      --highlight-bg: #1E1840;
      --text-main: #FFFFFF;
      --text-body: #C9C5E0;
      --text-muted: #7B74A6;
      --text-dim: #5B5676;
      --border-light: rgba(255,255,255,0.05);
      --border-card: rgba(0,229,160,0.3);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 40px rgba(0,229,160,0.15);
      --radius-card: 16px;
      --radius-sm: 8px;
      --radius-btn: 50px;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-mono: "DIN Alternate", "Roboto Mono", "Menlo", monospace;
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input, textarea {
      font-family: inherit;
      border: none;
      outline: none;
      background: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(13,11,30,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-main);
    }
    .logo-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover {
      color: var(--text-main);
    }
    .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--bg-deep);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #00FFB3;
      box-shadow: 0 0 24px rgba(0,229,160,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0,229,160,0.08);
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #16132B;
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 8px 16px;
      justify-content: space-around;
      z-index: 55;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 12px;
      gap: 4px;
    }
    .mobile-nav a.active {
      color: var(--accent);
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 80px 0;
      gap: 40px;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1;
      position: relative;
      background: url('/assets/images/backpic/hero-bg.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 24px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-card);
    }
    .floating-badge {
      background: #1E1840;
      border-radius: 12px;
      padding: 12px 20px;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      position: absolute;
      box-shadow: 0 8px 20px rgba(0,0,0,0.6);
      backdrop-filter: blur(4px);
    }
    .badge-1 { top: 20px; left: 20px; }
    .badge-2 { bottom: 30px; right: 20px; }
    .dot-orange {
      width: 10px;
      height: 10px;
      background: var(--emphasize);
      border-radius: 50%;
    }
    .data-number {
      font-family: var(--font-mono);
      font-weight: 700;
      color: var(--accent);
      font-size: 24px;
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 16px;
    }
    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .stat-card:hover {
      box-shadow: var(--shadow-glow);
      border: 1px solid var(--border-card);
    }
    .stat-icon {
      color: var(--accent);
      font-size: 28px;
      margin-bottom: 16px;
    }
    .stat-value {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 14px;
      margin-top: 8px;
    }
    .trend {
      color: var(--emphasize);
      font-size: 14px;
      font-weight: 600;
    }
    /* 服务矩阵 2+1 */
    .services-layout {
      display: grid;
      grid-template-columns: 5fr 5fr 2fr;
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-glow);
      border: 1px solid var(--border-card);
      transform: translateY(-4px);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .service-text {
      padding: 28px;
    }
    .service-text h3 {
      font-size: 22px;
      font-weight: 600;
      color: white;
      margin-bottom: 12px;
    }
    .badge-stack {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .badge-item {
      background: #1E1840;
      border-radius: 12px;
      padding: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    /* 对比区 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      margin-top: 32px;
    }
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 40px;
    }
    .compare-card.right {
      background: #1E1840;
      box-shadow: 0 0 24px rgba(0,229,160,0.2);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      margin-bottom: 24px;
      font-size: 18px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.04);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      background: #1E1840;
      border-radius: 8px;
      margin-top: 12px;
      padding: 0 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px;
    }
    /* 表单 */
    .cta-card {
      background: #1E1840;
      border-radius: 20px;
      padding: 48px;
      max-width: 560px;
      margin: 0 auto;
    }
    .input-field {
      width: 100%;
      background: #0D0B1E;
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 8px;
      padding: 14px 16px;
      color: white;
      margin-bottom: 20px;
    }
    .input-field:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0,229,160,0.15);
    }
    .footer {
      background: #0A0818;
      border-top: 1px solid rgba(255,255,255,0.05);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .data-grid { grid-template-columns: repeat(2,1fr); }
      .services-layout { grid-template-columns: 1fr 1fr; }
      .badge-stack { grid-column: span 2; flex-direction: row; }
      .compare-row { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .navbar .nav-links, .navbar .btn-primary { display: none; }
      .mobile-nav { display: flex; }
      .hero { flex-direction: column; }
      .hero h1 { font-size: 32px; }
      .section-title { font-size: 28px; }
      .data-grid { grid-template-columns: 1fr; }
      .services-layout { grid-template-columns: 1fr; }
      .badge-stack { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }