/* roulang page: index */
:root {
      --deep-blue: #0B1D3A;
      --electric-cyan: #00E5A1;
      --bg-light: #F5F7FA;
      --coral-accent: #FF5E3A;
      --text-dark: #1E2A38;
      --text-muted: #6B7B8D;
      --border-light: #E2E8F0;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(11,29,58,0.06);
      --shadow-hover: 0 12px 32px rgba(11,29,58,0.1);
      --radius-lg: 12px;
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 8px;
      --radius-badge: 20px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-heading);
      background: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      margin-bottom: 0.5rem;
    }
    p {
      margin-bottom: 1rem;
      color: var(--text-dark);
    }
    a {
      text-decoration: none;
      transition: color 0.25s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s ease;
      text-align: center;
      border: none;
      cursor: pointer;
      font-size: 16px;
      font-family: var(--font-heading);
    }
    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-blue);
    }
    .btn-primary:hover {
      background: var(--coral-accent);
      color: #fff;
      box-shadow: 0 8px 18px rgba(0,229,161,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-blue);
      color: var(--deep-blue);
    }
    .btn-outline:hover {
      background: var(--deep-blue);
      color: #fff;
    }
    .btn-large {
      padding: 16px 40px;
      font-size: 18px;
    }
    .badge {
      background: var(--electric-cyan);
      color: #fff;
      border-radius: var(--radius-badge);
      padding: 4px 12px;
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.3px;
      display: inline-block;
    }
    /* 导航 */
    #main-nav {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11,29,58,0.85);
      backdrop-filter: blur(12px);
      padding: 12px 0;
      transition: all 0.3s ease;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 26px;
      font-weight: 700;
      color: #fff;
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--electric-cyan);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
      margin: 0;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 16px;
    }
    .nav-links a:hover {
      color: var(--electric-cyan);
    }
    .nav-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 28px;
    }
    @media (max-width: 840px) {
      .nav-links, .nav-cta-group .btn {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-container {
        flex-wrap: wrap;
      }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: var(--deep-blue);
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      padding: 24px;
      gap: 20px;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      color: #fff;
      font-size: 18px;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 10px;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0B1D3A 0%, #00E5A1 100%);
      padding: 140px 0 100px;
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 60%;
    }
    .hero-image {
      flex: 1 1 40%;
      animation: float 4s ease-in-out infinite;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.5px;
      text-shadow: 0 2px 8px rgba(0,0,0,0.2);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 30px;
      max-width: 500px;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      h1 {
        font-size: 34px;
      }
      .hero-image {
        margin-top: 30px;
      }
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
      100% { transform: translateY(0); }
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 38px;
      font-weight: 600;
      margin-bottom: 20px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border-left: 4px solid var(--electric-cyan);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left-width: 8px;
      border-left-color: var(--coral-accent);
    }
    /* 痛点卡片特殊装饰 */
    .pain-icon {
      font-size: 40px;
      color: var(--electric-cyan);
      margin-bottom: 16px;
    }
    /* 解决方案交替布局 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 60px;
      padding-bottom: 40px;
      border-bottom: 1px solid var(--border-light);
      position: relative;
    }
    .solution-row:last-child {
      border-bottom: none;
    }
    .solution-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
    }
    .solution-text {
      flex: 1;
    }
    .solution-text ul {
      list-style: none;
      padding-left: 0;
    }
    .solution-text li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .solution-text li i {
      color: var(--electric-cyan);
    }
    @media (max-width: 768px) {
      .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column-reverse;
      }
    }
    /* 成果数字 */
    #results {
      background: #F0F3F8;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
      text-align: center;
    }
    .stat-number {
      font-size: 44px;
      font-weight: 700;
      color: var(--electric-cyan);
      font-family: var(--font-number);
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .quote-icon {
      font-size: 48px;
      color: var(--electric-cyan);
      opacity: 0.2;
      position: absolute;
      top: 20px;
      left: 24px;
    }
    .testimonial-text {
      font-style: italic;
      margin-top: 20px;
      font-size: 17px;
    }
    .client-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }
    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: #E2E8F0;
      border-radius: 50%;
    }
    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      color: var(--deep-blue);
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: 0.3s;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f8fafc;
      border-radius: 8px;
      padding: 0 16px;
    }
    .accordion-content p {
      padding: 12px 0;
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, #0B1D3A, #00E5A1);
      text-align: center;
      color: #fff;
    }
    .cta-button {
      background: var(--coral-accent);
      color: #fff;
      padding: 18px 48px;
      font-size: 20px;
      border-radius: 60px;
      border: none;
      animation: breathe 2s infinite;
      display: inline-block;
      margin-top: 24px;
    }
    @keyframes breathe {
      0% { box-shadow: 0 0 0 0 rgba(255,94,58,0.4); }
      70% { box-shadow: 0 0 0 18px rgba(255,94,58,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,94,58,0); }
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      color: #B0C4DE;
    }
    footer {
      background: var(--deep-blue);
      padding: 60px 0 30px;
    }
    .footer-links a {
      color: #B0C4DE;
      display: block;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: var(--electric-cyan);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: #8A9BB5;
    }