/* roulang page: index */
:root {
      --primary-deep: #0B1E3F;
      --secondary-silver: #3A6B9C;
      --accent-cyan: #00C9B6;
      --accent-cyan-hover: #00A894;
      --bg-warm: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-secondary: #64748B;
      --border-light: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 6px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 12px rgba(0,0,0,0.06), 0 12px 32px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", sans-serif;
      --transition-base: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      color: var(--text-main);
      background-color: var(--bg-warm);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: var(--transition-base);
    }

    #header.scrolled {
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .logo i {
      color: var(--accent-cyan);
      font-size: 28px;
      transform: rotate(-20deg);
    }

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

    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--primary-deep);
    }

    .btn-nav {
      background: var(--primary-deep);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(11,30,63,0.2);
      transition: var(--transition-base);
    }

    .btn-nav:hover {
      background: #132d54;
      box-shadow: 0 4px 14px rgba(11,30,63,0.3);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: white;
      box-shadow: -10px 0 30px rgba(0,0,0,0.1);
      padding: 24px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.4s ease;
      z-index: 200;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      text-decoration: none;
    }
    .close-menu {
      align-self: flex-end;
      background: none;
      border: none;
      font-size: 2rem;
      cursor: pointer;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    h1 {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
    }
    h2 {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }

    .btn {
      display: inline-block;
      font-weight: 600;
      font-size: 1rem;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: var(--transition-base);
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary-deep);
      color: white;
    }
    .btn-primary:hover {
      background: #132d54;
      box-shadow: 0 0 0 3px rgba(0,201,182,0.25);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary-silver);
      color: var(--secondary-silver);
    }
    .btn-outline:hover {
      background: rgba(58,107,156,0.08);
    }
    .btn-accent {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 700;
    }
    .btn-accent:hover {
      background: var(--accent-cyan-hover);
    }

    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: var(--bg-white);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left p {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin: 20px 0 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .cert-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .phone-mock {
      background: white;
      border-radius: 36px;
      box-shadow: var(--shadow-hover);
      padding: 18px 14px;
      background: #f1f5f9;
      width: 280px;
      height: 480px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 20px;
      position: relative;
      z-index: 2;
      border: 2px solid #e2e8f0;
    }
    .mock-icons i {
      font-size: 2.5rem;
      color: var(--secondary-silver);
      margin: 0 8px;
    }
    .star-particle {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(0,201,182,0.08) 0%, transparent 40%);
      top: 0;
      left: 0;
      border-radius: 36px;
    }

    /* Stats */
    #stats .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--bg-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: left;
      transition: var(--transition-base);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-cyan);
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* Services 左图标右文字 */
    #services .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition-base);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      min-width: 48px;
    }
    .service-text h3 {
      margin-bottom: 8px;
    }

    /* Compare */
    #compare .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 60px 1fr;
      align-items: center;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .vs-badge {
      background: var(--primary-deep);
      color: white;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
      margin: 0 auto;
    }
    .compare-col ul {
      list-style: none;
    }
    .compare-col li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 18px;
    }
    .negative i { color: #c94b4b; }
    .positive i { color: var(--accent-cyan); }

    /* FAQ */
    #faq {
      background: #F1F5F9;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 18px 24px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }

    /* CTA */
    #cta {
      background: linear-gradient(120deg, #0B1E3F 0%, #1E3A5F 100%);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      max-width: 480px;
      margin: 28px auto 0;
      gap: 12px;
    }
    .cta-form input {
      flex:1;
      padding: 14px 18px;
      border-radius: var(--radius-input);
      border: none;
      font-size: 1rem;
    }
    .cta-form input:focus {
      outline: none;
      box-shadow: 0 0 0 3px rgba(0,201,182,0.4);
    }

    /* Footer */
    #footer {
      background: var(--bg-white);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-col i { margin-right: 8px; }

    @media (max-width: 1024px) {
      .hero-grid, .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 20px auto; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .stats-grid, .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      h1 { font-size: 32px; }
    }