/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --deep-black: #0A0F1E;
      --gradient-dark: #1A1A3E;
      --cyan: #00E5FF;
      --pink: #FF3366;
      --pink-light: #FF5E7E;
      --bg-light: #F5F7FB;
      --white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-mid: #5A5A72;
      --text-light: #8E8EA0;
      --border-light: #DDE1E8;
      --bg-faq: #F9FAFC;
      --shadow-card: 0 4px 20px rgba(10, 15, 30, 0.06);
      --shadow-hover: 0 12px 32px rgba(0, 229, 255, 0.12);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-field: 12px;
      --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      --font-cn: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

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

    /* 导航 */
    .nav {
      background: var(--white);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--deep-black) 0%, #1E2A4A 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--cyan);
      font-size: 26px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-mid);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: 0.25s ease;
      transform: translateX(-50%);
    }
    .nav-links a:hover {
      color: var(--deep-black);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: linear-gradient(135deg, var(--deep-black), var(--gradient-dark));
      color: white;
      padding: 8px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      border: 1px solid rgba(0,229,255,0.25);
      box-shadow: 0 0 8px rgba(0,229,255,0.2);
      transition: 0.25s;
      margin-left: 8px;
    }
    .btn-nav:hover {
      box-shadow: 0 0 20px rgba(0,229,255,0.5);
      color: white;
    }
    .menu-toggle {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--deep-black);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A0F1E 0%, #1A1A3E 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(rgba(0,229,255,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
      gap: 40px;
    }
    .hero-content {
      flex: 1 1 45%;
      color: white;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--cyan);
    }
    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--deep-black), var(--gradient-dark));
      border: 1px solid rgba(0,229,255,0.55);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 0 15px rgba(0,229,255,0.3);
      transition: 0.25s;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0,229,255,0.7);
      color: white;
    }
    .btn-ghost {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-ghost:hover {
      background: rgba(0,229,255,0.1);
    }
    .hero-visual {
      flex: 1 1 45%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 380px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.15);
    }
    .badge-group {
      display: flex;
      gap: 16px;
      margin-top: 32px;
    }
    .badge {
      background: rgba(10,15,30,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid var(--cyan);
      color: white;
      padding: 8px 20px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    section {
      padding: 90px 0;
    }

    /* 指标看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-family: var(--font-en);
      font-size: 48px;
      font-weight: 800;
      background: linear-gradient(180deg, #00E5FF 0%, #0077B6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-mid);
      font-size: 16px;
      margin-top: 8px;
    }

    /* 服务矩阵 */
    .section-title {
      font-size: 36px;
      margin-bottom: 16px;
      color: var(--deep-black);
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
      border: 1px solid rgba(0,229,255,0.2);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #F0F9FF;
      border-radius: 18px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      color: var(--cyan);
    }
    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-mid);
      margin-bottom: 20px;
    }
    .link-cyan {
      color: var(--cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 结果对比 */
    .compare-wrapper {
      display: flex;
      gap: 24px;
      margin-top: 40px;
    }
    .compare-card {
      flex: 1;
      background: white;
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-card.old {
      background: #F2F2F7;
      border: 1px solid #E0E0E8;
    }
    .compare-card.new {
      background: linear-gradient(145deg, #0A0F1E, #12182B);
      color: white;
      border: 1px solid var(--cyan);
    }
    .progress-item {
      margin: 20px 0;
    }
    .progress-label {
      display: flex;
      justify-content: space-between;
      margin-bottom: 6px;
      font-weight: 600;
    }
    .progress-bar {
      height: 12px;
      background: #E0E4EA;
      border-radius: 20px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      background: var(--cyan);
      width: 85%;
      border-radius: 20px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      border: 1px solid #E8EAF0;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      padding: 0 24px;
      color: var(--text-mid);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-section {
      background: var(--deep-black);
      color: white;
      display: flex;
      justify-content: center;
    }
    .form-card {
      background: white;
      border-radius: 24px;
      padding: 40px;
      max-width: 600px;
      width: 100%;
      color: var(--text-dark);
      box-shadow: 0 20px 30px rgba(0,0,0,0.4);
    }
    .form-card input {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-field);
      margin: 12px 0;
      font-family: inherit;
    }
    .btn-cta {
      background: linear-gradient(135deg, var(--pink), var(--pink-light));
      color: white;
      border: none;
      padding: 14px;
      width: 100%;
      border-radius: var(--radius-btn);
      font-weight: 700;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-cta:hover {
      box-shadow: 0 8px 22px rgba(255,51,102,0.5);
    }

    footer {
      background: #F0F2F5;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .hero h1 { font-size: 36px; }
      .compare-wrapper { flex-direction: column; }
      .service-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }