/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #0A6EFF;
      --primary-hover: #0856CC;
      --accent: #00E5A0;
      --accent-hover: #00c78a;
      --warning: #FF5C35;
      --bg: #F7F9FC;
      --surface: #FFFFFF;
      --text: #1A2B3C;
      --text-secondary: #5F6B7A;
      --border: #E0E6ED;
      --shadow-sm: 0 2px 16px rgba(10, 110, 255, 0.06);
      --shadow-md: 0 8px 28px rgba(10, 110, 255, 0.12);
      --shadow-glow: 0 0 20px rgba(10, 110, 255, 0.3);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-full: 50%;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 排版 */
    h1, h2, h3, .font-display {
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text);
    }

    h2 {
      font-size: 36px;
      color: var(--text);
    }

    h3 {
      font-size: 22px;
      color: var(--text);
    }

    p {
      color: var(--text-secondary);
      font-weight: 400;
    }

    .text-small {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    .number-display {
      font-family: "Inter", "SF Pro Display", system-ui, sans-serif;
      font-size: 56px;
      font-weight: 800;
      color: var(--primary);
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--surface);
      border-bottom: 1px solid transparent;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      transition: var(--transition);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      font-weight: 700;
      font-size: 22px;
      color: var(--text);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: var(--radius-sm);
      color: white;
      font-size: 20px;
      clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-link:hover {
      color: var(--primary);
    }

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

    .nav-link.active {
      color: var(--primary);
      background: rgba(10, 110, 255, 0.08);
      padding: 6px 14px;
      border-radius: 20px;
      margin: -6px -14px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 10px rgba(10, 110, 255, 0.2);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 20px rgba(10, 110, 255, 0.4);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(10, 110, 255, 0.08);
    }

    .btn-cta {
      background: var(--accent);
      color: var(--text);
      padding: 18px 48px;
      font-size: 18px;
      box-shadow: 0 8px 20px rgba(0, 229, 160, 0.25);
    }

    .btn-cta:hover {
      background: var(--accent-hover);
      box-shadow: 0 0 25px rgba(0, 229, 160, 0.5);
      transform: scale(1.02);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text);
      cursor: pointer;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    /* Hero */
    .hero {
      padding: 160px 0 120px;
      display: flex;
      align-items: center;
      background: var(--bg);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 1;
    }

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

    .speed-track {
      position: relative;
      width: 320px;
      height: 320px;
    }

    .track-svg {
      width: 100%;
      height: 100%;
    }

    .data-badge {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 18px 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 1px solid var(--border);
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .pain-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-left: 4px solid var(--warning);
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .solution-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: left;
    }

    .solution-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(10, 110, 255, 0.1);
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 20px;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
      background: rgba(10, 110, 255, 0.02);
      padding: 60px 32px;
      border-radius: var(--radius-lg);
    }

    /* 证言横向滚动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 24px 0 32px;
      scrollbar-width: thin;
      margin-top: 40px;
    }

    .testimonial-card {
      flex: 0 0 380px;
      background: var(--surface);
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-left: 3px solid var(--primary);
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-full);
      background-size: cover;
      background-position: center;
    }

    /* FAQ */
    .faq-list {
      margin-top: 40px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 500;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      color: var(--text-secondary);
      font-size: 15px;
      padding-top: 0;
    }

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

    /* 表单 */
    .cta-form {
      display: flex;
      gap: 12px;
      max-width: 500px;
      margin: 32px auto 0;
    }

    .cta-input {
      flex: 1;
      padding: 14px 20px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 16px;
      outline: none;
      transition: var(--transition);
    }

    .cta-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,110,255,0.2);
    }

    /* 页脚 */
    .footer {
      background: #EDF1F6;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .pain-grid, .solution-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .mobile-toggle { display: block; }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .pain-grid, .solution-grid, .stats-grid { grid-template-columns: 1fr; }
      .cta-form { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }