/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary: #0DF2C8;
      --primary-hover: #3DF5D8;
      --secondary: #6C3CE1;
      --bg-deep: #0A0E17;
      --bg-card: #131A26;
      --bg-glass: rgba(19, 26, 38, 0.7);
      --text-main: #EAECF0;
      --text-muted: #98A2B3;
      --text-disabled: #475467;
      --danger: #F04438;
      --success: #12B76A;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --shadow-card: 0 0 0 1px rgba(255, 255, 255, 0.05), 0 8px 16px -4px rgba(0,0,0,0.6);
      --shadow-glow: 0 0 24px rgba(13, 242, 200, 0.25);
      --transition: all 0.25s ease;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1280px;
      --section-gap: 120px;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-deep);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.75);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      transition: background 0.3s ease;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 23, 0.96);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      letter-spacing: -0.3px;
      color: white;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }

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

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

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

    .btn-login {
      background: var(--primary);
      color: #0A0E17;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 0.3px;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(13,242,200,0.3);
    }

    .btn-login:hover {
      background: var(--primary-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }

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

    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
    }

    /* 首屏 Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(108,60,225,0.2) 0%, transparent 50%), 
                  linear-gradient(180deg, #0A0E17 0%, #0a0e17d9 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10, 14, 23, 0.65);
      backdrop-filter: blur(2px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin-top: 40px;
    }

    .hero h1 {
      font-size: 58px;
      line-height: 1.15;
      font-weight: 800;
      letter-spacing: -0.025em;
      background: linear-gradient(135deg, #0DF2C8, #fff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 20px;
      color: var(--text-muted);
      margin: 24px 0 40px;
      max-width: 600px;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #0A0E17;
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 17px;
      letter-spacing: 0.4px;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(13,242,200,0.35);
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 12px 28px rgba(13,242,200,0.5);
      transform: scale(1.02);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-size: 17px;
      transition: var(--transition);
      cursor: pointer;
    }

    .btn-ghost:hover {
      background: rgba(13,242,200,0.08);
      border-color: var(--primary-hover);
    }

    /* 区块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 42px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }

    .section-title span {
      color: var(--primary);
    }

    .title-decor {
      width: 50px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      margin: 16px 0 32px;
    }

    /* 痛点挑战 */
    .challenge-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }

    .challenge-card {
      background: var(--bg-glass);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      transition: var(--transition);
    }

    .challenge-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 0 0 1px rgba(13,242,200,0.2), 0 20px 30px -10px black;
    }

    .challenge-icon {
      font-size: 32px;
      margin-bottom: 20px;
    }

    /* 解决方案 左右交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 80px;
      margin: 80px 0;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    .solution-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 30px -12px black;
    }

    .solution-text {
      flex: 1;
    }

    .highlight-num {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      margin-top: 48px;
    }

    .stat-card {
      background: #131A26;
      border-radius: var(--radius-card);
      padding: 40px 28px;
      text-align: center;
      border-left: 4px solid var(--primary);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: white;
    }

    /* 证言错落网格 */
    .testimonial-masonry {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .testimonial-card {
      background: rgba(19,26,38,0.7);
      backdrop-filter: blur(8px);
      border-radius: 24px;
      padding: 28px;
      grid-column: span 2;
      position: relative;
    }

    .testimonial-card:nth-child(3) {
      grid-column: span 1;
    }
    .testimonial-card:nth-child(4) {
      grid-column: span 1;
    }

    .big-quote {
      font-size: 64px;
      color: var(--primary);
      opacity: 0.3;
      position: absolute;
      top: 10px;
      left: 20px;
    }

    /* FAQ */
    .faq-layout {
      display: flex;
      gap: 48px;
      margin-top: 40px;
    }

    .faq-categories {
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 160px;
    }

    .faq-cat {
      padding: 10px 18px;
      border-radius: 20px;
      font-weight: 600;
      color: var(--text-muted);
      cursor: pointer;
    }

    .faq-cat.active {
      background: rgba(13,242,200,0.15);
      color: var(--primary);
    }

    .accordion {
      flex: 1;
    }

    .accordion-item {
      background: #131A26;
      border-radius: 12px;
      margin-bottom: 12px;
    }

    .accordion-question {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #0A0E17;
      color: var(--text-muted);
      padding: 0 24px;
    }

    .accordion-item.open .accordion-answer {
      max-height: 160px;
      padding: 0 24px 20px;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #0A0E17 0%, #0f172a 100%);
      text-align: center;
    }

    /* Footer */
    .footer {
      background: #0A0E17;
      border-top: 1px solid rgba(255,255,255,0.05);
      padding: 48px 0 24px;
    }

    .footer-links {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
      margin: 24px 0;
    }

    @media (max-width: 1024px) {
      .testimonial-masonry {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0A0E17;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        z-index: 999;
      }
      .mobile-menu.active { display: flex; }
      .hero h1 { font-size: 38px; }
      .challenge-grid, .stats-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; gap: 32px; }
      .faq-layout { flex-direction: column; }
      .testimonial-masonry { grid-template-columns: 1fr; }
    }