/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-magenta: #FF3366;
      --neutral-light: #F5F6FA;
      --neutral-dark: #1A1F3A;
      --text-muted: #8E94A4;
      --text-body: #4A4F63;
      --gradient-energy: linear-gradient(135deg, #00F0FF 0%, #0066FF 100%);
      --gradient-magenta: linear-gradient(135deg, #FF3366 0%, #FF6B8A 100%);
      --radius-card: 16px;
      --radius-button: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,240,255,0.12);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.2, 0.0, 0, 1.0);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: #ffffff;
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      transition: var(--transition-smooth);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      background: var(--gradient-energy);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 4px;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      font-size: 22px;
      background: none;
      -webkit-text-fill-color: var(--accent-cyan);
    }

    .nav-list {
      display: flex;
      list-style: none;
      gap: 32px;
      align-items: center;
    }

    .nav-list a {
      color: #1A1F3A;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
    }

    .nav-list a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.25s ease;
    }

    .nav-list a:hover {
      color: var(--accent-cyan);
    }

    .nav-list a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      padding: 8px;
      z-index: 1001;
    }

    .hamburger span {
      display: block;
      width: 26px;
      height: 2.5px;
      background: #1A1F3A;
      border-radius: 4px;
      transition: 0.25s;
    }

    .mobile-menu {
      display: none;
    }

    /* 首屏 Hero */
    .hero {
      min-height: 100vh;
      background: var(--primary-deep);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }

    .hero-bg-canvas {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      opacity: 0.25;
      pointer-events: none;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 480px;
    }

    .hero-text h1 {
      font-size: 56px;
      font-weight: 900;
      line-height: 1.2;
      background: var(--gradient-energy);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-text h3 {
      font-size: 20px;
      font-weight: 400;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .btn-primary {
      background: var(--gradient-energy);
      color: white;
      border-radius: var(--radius-button);
      padding: 14px 36px;
      font-weight: 700;
      font-size: 16px;
      display: inline-block;
      box-shadow: 0 8px 18px rgba(0,240,255,0.25);
      transition: 0.25s;
    }

    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 14px 28px rgba(0,240,255,0.4);
    }

    .hero-visual {
      flex: 1 1 400px;
      position: relative;
      height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* 痛点区 */
    .section-pain {
      background: #ffffff;
      padding: 100px 0;
    }

    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .pain-card {
      background: var(--neutral-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition-smooth);
    }

    .pain-card:hover {
      background: white;
      box-shadow: var(--shadow-hover);
    }

    .pain-icon {
      font-size: 32px;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }

    .pain-card h3 {
      font-size: 22px;
      font-weight: 700;
      color: #1A1F3A;
      margin-bottom: 12px;
    }

    /* 解决方案 */
    .section-solution {
      padding: 100px 0;
      background: #ffffff;
    }

    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }

    .solution-card {
      background: white;
      border: 1px solid #E8ECF1;
      border-radius: var(--radius-card);
      padding: 30px 24px;
      transition: var(--transition-smooth);
    }

    .solution-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .solution-icon {
      font-size: 36px;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }

    .solution-card h3 {
      font-size: 22px;
      font-weight: 700;
      color: #0A0E27;
      margin-bottom: 12px;
    }

    .fake-link {
      color: var(--accent-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      margin-top: 16px;
      transition: 0.2s;
    }

    .fake-link:hover {
      gap: 8px;
    }

    /* 数据成果 */
    .section-results {
      background: var(--neutral-dark);
      padding: 90px 0;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }

    .stat-item .stat-number {
      font-size: 64px;
      font-weight: 900;
      background: var(--gradient-energy);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .stat-label {
      color: #ccc;
      font-size: 18px;
      margin-top: 8px;
    }

    /* 证言 */
    .section-testimonials {
      padding: 100px 0;
    }

    .testimonial-carousel {
      display: flex;
      gap: 28px;
      overflow-x: auto;
      padding: 20px 0 30px;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      min-width: 320px;
      background: white;
      border-radius: 20px;
      padding: 28px;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .avatar-placeholder {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--gradient-energy);
      flex-shrink: 0;
    }

    /* FAQ */
    .section-faq {
      padding: 100px 0;
      background: #fafbfc;
    }

    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: var(--neutral-light);
      border-radius: 12px;
      transition: 0.2s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: #4A4F63;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }

    /* CTA */
    .section-cta {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 100%);
      padding: 100px 0;
      text-align: center;
    }

    .btn-outline {
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      border-radius: var(--radius-button);
      padding: 12px 32px;
      font-weight: 600;
      margin-left: 16px;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    /* 页脚 */
    .footer {
      background: #0A0E27;
      color: #ccc;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .nav-list { display: none; }
      .hamburger { display: flex; }
      .hero-text h1 { font-size: 36px; }
      .pain-grid, .solution-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }