/* roulang page: index */
:root {
      --primary: #FF4D2E;
      --primary-hover: #e6431f;
      --secondary-dark: #1A1A2E;
      --accent: #00D2FF;
      --accent-hover: #00aacc;
      --bg-light: #F9F9FB;
      --text-dark: #1E1E2F;
      --text-muted: #5A5A72;
      --white: #ffffff;
      --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
      --card-shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.12);
      --radius-xl: 24px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --transition: 0.3s ease;
      --container-max: 1280px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      background: transparent;
      transition: all var(--transition);
      font-weight: 600;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      font-size: 16px;
      line-height: 1.2;
      gap: 8px;
    }

    .btn:focus-visible, a:focus-visible, button:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #FF4D2E 0%, #FF6B4A 100%);
      color: var(--white);
      box-shadow: 0 8px 20px rgba(255, 77, 46, 0.25);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 12px 28px rgba(255, 77, 46, 0.35);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
    }
    .btn-outline:hover {
      background: rgba(0, 210, 255, 0.08);
      border-color: var(--accent-hover);
      color: var(--accent-hover);
    }

    .btn-large {
      padding: 18px 48px;
      font-size: 18px;
      border-radius: var(--radius-lg);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.03);
      transition: background var(--transition);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--text-dark);
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: radial-gradient(circle at 80% 20%, rgba(255,77,46,0.08), transparent 60%);
      background-color: var(--bg-light);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      line-height: 1.25;
      font-weight: 700;
      margin-bottom: 24px;
      color: var(--text-dark);
    }
    .hero-content p {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .glow-sphere {
      width: 320px;
      height: 320px;
      background: radial-gradient(circle at 30% 30%, rgba(255,77,46,0.45), rgba(26,26,46,0.9));
      border-radius: 50%;
      filter: blur(40px);
      position: absolute;
      z-index: 0;
    }
    .data-badge {
      position: absolute;
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 12px 20px;
      box-shadow: var(--card-shadow);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
      z-index: 2;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
    }
    .badge-1 { top: 20px; right: 20px; }
    .badge-2 { bottom: 40px; left: 10px; }
    .hero-bg-img {
      width: 100%;
      max-width: 400px;
      border-radius: var(--radius-xl);
      box-shadow: var(--card-shadow);
      position: relative;
      z-index: 1;
    }

    /* 通用区块 */
    .section {
      padding: 120px 0;
    }
    .section-dark {
      background: linear-gradient(135deg, #1A1A2E 0%, #2D2D44 100%);
      color: var(--white);
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 60px;
    }
    .section-dark .section-sub {
      color: rgba(255,255,255,0.7);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: #2D2D44;
      border-radius: var(--radius-xl);
      padding: 40px;
      position: relative;
      border-top: 4px solid var(--primary);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .pain-card h3 {
      font-size: 22px;
      margin: 16px 0 12px;
      color: white;
    }
    .pain-card p {
      color: #b0b0c0;
    }
    .icon-accent {
      color: var(--accent);
      font-size: 32px;
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-xl);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-shadow-hover);
    }
    .solution-icon {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg, #FF4D2E, #FF6B4A);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      margin-bottom: 24px;
    }
    .solution-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .data-chip {
      display: inline-flex;
      background: linear-gradient(135deg, #00D2FF, #00A3CC);
      color: white;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      margin-top: 16px;
    }

    /* 成果看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-item h3 {
      font-size: 56px;
      font-weight: 700;
      color: white;
    }
    .stat-item p {
      color: var(--accent);
      font-weight: 500;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--primary);
    }
    .testimonial-text {
      font-style: italic;
      margin: 16px 0;
      color: var(--text-dark);
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: #ddd;
      border-radius: 50%;
      background: linear-gradient(135deg, #FF4D2E, #FF6B4A);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-xl);
      padding: 24px 32px;
      margin-bottom: 16px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-muted);
      display: none;
      border-top: 1px solid #eee;
      padding-top: 12px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 最终CTA */
    .cta-band {
      background: linear-gradient(135deg, #FF4D2E 0%, #FF6B4A 100%);
      padding: 100px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #1A1A2E;
      color: #b0b0c0;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      border-top: 1px solid #2D2D44;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .mobile-menu.active { display: flex; flex-direction: column; background: white; position: absolute; top: 72px; left: 0; width: 100%; padding: 24px; box-shadow: 0 20px 30px rgba(0,0,0,0.1); }
      .hero-grid { grid-template-columns: 1fr; }
      .pain-grid, .testimonial-grid, .stats-grid { grid-template-columns: 1fr; }
      .solution-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 36px; }
    }