/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-card: #111636;
      --primary: #7C3AED;
      --secondary: #06B6D4;
      --gold: #F59E0B;
      --text-main: #FFFFFF;
      --text-body: #E2E8F0;
      --text-muted: #94A3B8;
      --border-glass: rgba(255,255,255,0.08);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-primary: 0 4px 20px rgba(124,58,237,0.5);
      --radius-card: 16px;
      --radius-inner: 12px;
      --radius-btn: 50px;
      --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      padding: 16px 0;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }
    .nav.scrolled {
      background: rgba(10,14,39,0.88);
      backdrop-filter: blur(20px);
      box-shadow: 0 2px 20px rgba(0,0,0,0.4);
      border-bottom: 1px solid var(--border-glass);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: 2px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
      position: relative;
      z-index: 10;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: var(--shadow-primary);
      transition: transform 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 6px 28px rgba(124,58,237,0.7);
      color: #fff;
    }
    .burger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      z-index: 20;
    }
    .burger span {
      width: 28px;
      height: 3px;
      background: var(--text-main);
      border-radius: 3px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(10,14,39,0.96);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      z-index: 15;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      font-size: 1.6rem;
      font-weight: 600;
      color: var(--text-main);
    }
    /* Hero */
    .hero {
      padding: 160px 0 100px;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 20% 20%, rgba(124,58,237,0.25) 0%, transparent 50%),
                  radial-gradient(circle at 80% 80%, rgba(6,182,212,0.2) 0%, transparent 50%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      font-weight: 800;
      font-size: 56px;
      line-height: 1.1;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      max-width: 72ch;
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      box-shadow: var(--shadow-primary);
      transition: transform 0.2s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 32px rgba(124,58,237,0.7);
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid rgba(124,58,237,0.6);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-ghost:hover {
      border-color: var(--primary);
      background: rgba(124,58,237,0.08);
    }
    .hero-visual {
      flex: 1;
      position: relative;
    }
    .hero-visual img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      width: 100%;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      font-weight: 700;
      font-size: 40px;
      line-height: 1.3;
      color: var(--text-main);
      text-align: center;
      margin-bottom: 16px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 60px;
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .glass-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 48px rgba(124,58,237,0.15);
      border-color: rgba(124,58,237,0.3);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(6,182,212,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--secondary);
    }
    .pain-title {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .solution-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      border-color: rgba(124,58,237,0.4);
      box-shadow: 0 0 30px rgba(124,58,237,0.25);
    }
    .solution-img {
      height: 200px;
      overflow: hidden;
    }
    .solution-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .solution-content {
      padding: 28px;
    }
    .solution-content h3 {
      font-weight: 600;
      font-size: 1.4rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .feature-list {
      list-style: none;
      margin: 16px 0;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
      color: var(--text-body);
    }
    .feature-list li::before {
      content: "✓";
      color: var(--secondary);
      font-weight: bold;
    }
    .text-link {
      color: var(--secondary);
      font-weight: 500;
      transition: color 0.2s;
      display: inline-block;
      margin-top: 8px;
    }
    .text-link:hover {
      color: var(--primary);
    }
    /* 数据区 */
    .data-section {
      background: #0A0E27;
    }
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .data-item .number {
      font-family: "DIN Alternate", "Inter", sans-serif;
      font-weight: 800;
      font-size: 48px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .data-label {
      color: var(--text-muted);
      margin-top: 8px;
    }
    /* 证言 */
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .testi-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(18px);
      border-left: 4px solid var(--primary);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .testi-quote {
      font-style: italic;
      font-size: 1.1rem;
      margin-bottom: 20px;
      color: #E2E8F0;
    }
    .testi-author {
      color: var(--gold);
      font-weight: 600;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 24px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.2rem;
      color: var(--text-main);
      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-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }
    /* CTA */
    .cta-section {
      background: #0A0E27;
      text-align: center;
      padding: 100px 0;
    }
    .cta-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    /* Footer */
    .footer {
      background: #0A0E27;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-weight: 800;
      font-size: 1.8rem;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .footer a {
      color: var(--text-muted);
      transition: color 0.2s;
    }
    .footer a:hover {
      color: var(--secondary);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .pain-grid, .solution-grid, .testi-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .data-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .burger { display: flex; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 32px; }
      .pain-grid, .solution-grid, .testi-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .hero h1 { font-size: 28px; }
      .btn-primary, .btn-ghost { width: 100%; text-align: center; }
      .data-grid { grid-template-columns: 1fr 1fr; }
    }