/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-dark: #3A54D4;
      --primary-deep: #2E3F9E;
      --green: #00B578;
      --orange: #FF9F0A;
      --red: #FA5151;
      --bg-dark-start: #0A0E27;
      --bg-dark-end: #1A1F3A;
      --gray-bg: #F5F6FA;
      --card-white: rgba(255,255,255,0.92);
      --card-border: rgba(255,255,255,0.18);
      --text-black: #1F2329;
      --text-gray: #86909C;
      --line-light: #E5E8EF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.12);
      --shadow-glass: 0 8px 32px rgba(0,0,0,0.08);
      --shadow-nav: 0 1px 8px rgba(0,0,0,0.06);
      --radius-lg: 12px;
      --radius-btn: 50px;
      --radius-input: 50px;
      --transition: 200ms ease-out;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: #ffffff;
      color: var(--text-black);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航固定顶部毛玻璃 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      box-shadow: none;
      transition: box-shadow 0.2s;
    }

    .navbar.scrolled {
      box-shadow: var(--shadow-nav);
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: white;
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 0.5px;
    }

    .logo span {
      background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.15s, opacity 0.15s;
    }

    .nav-links a:hover {
      color: #ffffff;
      opacity: 1;
    }

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

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

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 8px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: background 0.2s, box-shadow 0.2s;
      margin-left: 8px;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 16px rgba(78,110,242,0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
      z-index: 1001;
    }

    .hamburger span {
      display: block;
      width: 22px;
      height: 2px;
      background: white;
      transition: 0.2s;
      border-radius: 2px;
    }

    .mobile-menu {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .navbar {
        padding: 0 20px;
        height: 56px;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,14,39,0.96);
        backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 36px;
        z-index: 999;
        transform: translateY(-100%);
        transition: transform 0.3s ease;
      }
      .mobile-menu.open {
        transform: translateY(0);
      }
      .mobile-menu a {
        color: white;
        font-size: 18px;
        text-decoration: none;
        font-weight: 500;
      }
      .mobile-menu .mobile-cta {
        background: var(--primary);
        padding: 12px 32px;
        border-radius: var(--radius-btn);
        font-weight: 600;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, var(--bg-dark-start) 0%, var(--bg-dark-end) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      overflow: hidden;
      padding: 100px 24px 80px;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000" opacity="0.08"><path d="M200 200 L800 200 L800 800 L200 800 Z" fill="none" stroke="%234E6EF2" stroke-width="1.2"/><circle cx="500" cy="500" r="300" fill="none" stroke="%234E6EF2" stroke-width="0.8"/><path d="M100 500 L900 500 M500 100 L500 900" stroke="%234E6EF2" stroke-width="0.5"/></svg>');
      background-size: cover;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .hero h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }

    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 36px;
      max-width: 600px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
      box-shadow: 0 0 16px rgba(78,110,242,0.4);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 24px rgba(78,110,242,0.6);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      transition: background 0.2s, border-color 0.2s;
      display: inline-block;
    }

    .btn-secondary:hover {
      background: rgba(78,110,242,0.06);
      border-color: var(--primary-dark);
    }

    .hero-image {
      margin-top: 40px;
      max-width: 500px;
      width: 100%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-glass);
      border: 1px solid rgba(255,255,255,0.2);
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
    }

    .hero-image img {
      width: 100%;
      display: block;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 28px;
      }
      .hero .subtitle {
        font-size: 15px;
      }
      .btn-primary, .btn-secondary {
        padding: 12px 28px;
        font-size: 15px;
      }
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-gray);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }

    .bg-gray {
      background: var(--gray-bg);
    }

    .bg-dark {
      background: linear-gradient(135deg, var(--bg-dark-start) 0%, var(--bg-dark-end) 100%);
      color: white;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 40px;
      align-items: center;
    }

    .card-glass {
      background: var(--card-white);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-glass);
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .card-glass:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(78,110,242,0.3);
    }

    @media (max-width: 992px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      section {
        padding: 60px 0;
      }
      .section-title {
        font-size: 22px;
      }
    }

    /* 痛点卡片 */
    .pain-card i {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
      display: inline-block;
    }

    /* 解决方案图文 */
    .solution-text h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .solution-text p {
      color: var(--text-gray);
      margin-bottom: 16px;
      line-height: 1.6;
    }
    .solution-img img {
      width: 100%;
      border-radius: var(--radius-lg);
    }

    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), #82a0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 证言 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px;
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 36px;
      color: rgba(78,110,242,0.2);
      position: absolute;
      top: 10px;
      left: 20px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border: 1px solid var(--line-light);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      padding: 0 20px 16px;
      color: var(--text-gray);
      display: none;
    }
    .faq-item.active {
      border-left: 3px solid var(--primary);
      background: #F8F9FC;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA底 */
    .cta-bottom {
      text-align: center;
    }
    .glow-btn {
      box-shadow: 0 0 32px rgba(78,110,242,0.5);
    }

    footer {
      background: var(--bg-dark-start);
      color: var(--text-gray);
      padding: 48px 0 24px;
    }
    footer a {
      color: var(--text-gray);
      text-decoration: none;
    }
    footer a:hover {
      color: var(--primary);
    }