/* roulang page: index */
:root {
      --deep-ocean: #0B1D3A;
      --coral-orange: #FF6B4A;
      --coral-orange-dark: #E85D3A;
      --foam-white: #F0F4F8;
      --whale-silver: #8E9AAF;
      --deep-green: #0D9488;
      --text-dark: #1A1F2E;
      --white: #FFFFFF;
      --card-shadow: 0 4px 24px rgba(11, 29, 58, 0.06);
      --card-shadow-hover: 0 8px 32px rgba(11, 29, 58, 0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--foam-white);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      z-index: 999;
      background: rgba(240, 244, 248, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 16px rgba(11, 29, 58, 0.04);
      display: flex;
      align-items: center;
      transition: var(--transition-smooth);
    }

    .header.scrolled {
      box-shadow: 0 6px 20px rgba(11, 29, 58, 0.08);
      background: rgba(240, 244, 248, 0.95);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 800;
      color: var(--deep-ocean);
      letter-spacing: 1px;
    }

    .logo-icon {
      display: inline-block;
      width: 26px;
      height: 20px;
      background: var(--coral-orange);
      clip-path: polygon(0% 60%, 30% 30%, 70% 20%, 100% 10%, 85% 70%, 50% 90%, 15% 85%);
      margin-right: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--whale-silver);
      position: relative;
      padding: 4px 0;
      transition: var(--transition-smooth);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--deep-ocean);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--coral-orange);
      border-radius: 2px;
      transition: width 0.2s ease;
    }

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

    .btn-nav {
      background: var(--coral-orange);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
    }

    .btn-nav:hover {
      background: var(--coral-orange-dark);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--deep-ocean);
      border-radius: 2px;
      transition: var(--transition-smooth);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: rgba(240, 244, 248, 0.98);
      backdrop-filter: blur(16px);
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      box-shadow: 0 12px 24px rgba(0,0,0,0.08);
      z-index: 998;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 600;
      color: var(--deep-ocean);
      border-bottom: 1px solid rgba(142, 154, 175, 0.2);
      padding-bottom: 8px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background-color: var(--foam-white);
      background-image: radial-gradient(circle at 80% 30%, rgba(11, 29, 58, 0.02) 0%, transparent 35%);
      position: relative;
      overflow: hidden;
    }

    .hero-watermark {
      position: absolute;
      right: -20px;
      top: 20%;
      width: 45%;
      height: 60%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 150" opacity="0.04"><path d="M60 20 C100 5 160 25 170 70 C175 95 155 120 130 125 C100 132 70 110 50 85 C30 60 25 35 60 20Z" fill="%230B1D3A"/></svg>') no-repeat center/contain;
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }

    .hero-content {
      flex: 1;
    }

    .hero-content h1 {
      font-size: clamp(40px, 6vw, 56px);
      font-weight: 800;
      color: var(--deep-ocean);
      line-height: 1.25;
      margin-bottom: 24px;
    }

    .hero-content p {
      font-size: 18px;
      color: var(--whale-silver);
      margin-bottom: 36px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--coral-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--coral-orange-dark);
      transform: scale(1.03);
    }

    .btn-outline {
      border: 2px solid var(--deep-ocean);
      color: var(--deep-ocean);
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
    }

    .btn-outline:hover {
      background: var(--deep-ocean);
      color: white;
    }

    .hero-image {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(11,29,58,0.12);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: clamp(32px, 5vw, 40px);
      font-weight: 700;
      color: var(--deep-ocean);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--whale-silver);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 60px;
      font-size: 18px;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
      text-align: center;
      border: 1px solid rgba(142,154,175,0.1);
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }

    .card-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      color: var(--coral-orange);
      stroke: var(--coral-orange);
    }

    .card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--deep-ocean);
    }

    .card p {
      color: var(--whale-silver);
      line-height: 1.75;
    }

    /* 场景2列 */
    .scenario-row {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 80px;
    }

    .scenario-text {
      flex: 1;
    }

    .scenario-text h3 {
      font-size: 28px;
      font-weight: 700;
      color: var(--deep-ocean);
      margin-bottom: 16px;
    }

    .scenario-text ul {
      list-style: none;
      margin-top: 20px;
    }

    .scenario-text li {
      padding-left: 20px;
      position: relative;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    .scenario-text li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 10px;
      width: 8px;
      height: 8px;
      background: var(--coral-orange);
      border-radius: 50%;
    }

    .scenario-img {
      flex: 1;
      border-radius: 12px;
      overflow: hidden;
    }

    .scenario-img img {
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    /* 数据卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: white;
      padding: 32px 16px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--card-shadow);
    }

    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--coral-orange);
      font-variant-numeric: tabular-nums;
    }

    .stat-label {
      font-size: 14px;
      color: var(--whale-silver);
      margin-top: 8px;
    }

    .client-logos {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 48px;
      flex-wrap: wrap;
    }

    .logo-placeholder {
      width: 100px;
      height: 48px;
      background: #e9edf2;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--whale-silver);
      font-size: 12px;
    }

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

    .faq-item {
      border-bottom: 1px solid rgba(142,154,175,0.25);
      margin-bottom: 8px;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-size: 20px;
      font-weight: 700;
      color: var(--deep-ocean);
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      border: none;
      cursor: pointer;
      transition: 0.3s;
    }

    .faq-question span {
      color: var(--coral-orange);
      font-size: 24px;
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.25s;
      background: rgba(240,244,248,0.6);
      border-radius: 8px;
      padding: 0 16px;
      color: var(--text-dark);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }

    .faq-item.active .faq-question span {
      transform: rotate(45deg);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-ocean);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .cta-banner h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .cta-banner .btn-primary {
      margin-top: 24px;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-ocean);
      color: var(--whale-silver);
      padding: 60px 0 30px;
    }

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

    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }

    .footer a {
      color: var(--whale-silver);
      display: block;
      margin-bottom: 8px;
    }

    .footer a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

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

    @media (max-width: 640px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .card-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { padding: 120px 0 60px; }
      .section { padding: 70px 0; }
    }