/* roulang page: index */
:root {
      --deep-ocean: #0B2B3B;
      --tropical-teal: #14A098;
      --coral-red: #F85C3C;
      --soft-bg: #F6F9FA;
      --white: #FFFFFF;
      --text-main: #1A2A33;
      --text-muted: #5E6F7A;
      --border-light: #E0E8EC;
      --card-shadow: 0 10px 25px -8px rgba(11,43,59,0.08), 0 4px 10px -2px rgba(11,43,59,0.04);
      --card-hover-shadow: 0 20px 35px -12px rgba(11,43,59,0.18), 0 8px 16px -6px rgba(11,43,59,0.1);
      --radius-card: 20px;
      --radius-btn: 60px;
      --radius-capsule: 60px;
      --font-mono: "SF Mono", "Menlo", "Consolas", "Courier New", monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      background-color: var(--soft-bg);
      color: var(--text-main);
      margin: 0;
      line-height: 1.75;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 悬浮胶囊导航 */
    .capsule-nav {
      position: fixed;
      top: 1.8rem;
      left: 50%;
      transform: translateX(-50%);
      width: min(92%, 780px);
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-radius: var(--radius-capsule);
      padding: 0.6rem 2.2rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 12px 30px -10px rgba(11,43,59,0.15);
      z-index: 100;
      border: 1px solid rgba(255,255,255,0.4);
      transition: all 0.2s ease;
    }

    .nav-logo {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--deep-ocean);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.8rem;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--deep-ocean);
      transition: width 0.25s ease;
    }

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

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

    .nav-cta {
      background: var(--coral-red);
      color: white !important;
      padding: 0.5rem 1.8rem;
      border-radius: 40px;
      font-weight: 600;
      box-shadow: 0 6px 14px rgba(248,92,60,0.3);
      transition: all 0.25s ease;
      margin-left: 0.5rem;
    }

    .nav-cta:hover {
      background: #e04a2a;
      transform: scale(1.04);
      box-shadow: 0 10px 20px rgba(248,92,60,0.4);
    }

    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.6rem;
      color: var(--deep-ocean);
    }

    /* Hero 看板 */
    .hero {
      background-color: var(--deep-ocean);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 30%;
      position: relative;
      padding: 8rem 0 5rem;
      border-radius: 0 0 60px 60px;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: radial-gradient(circle at 30% 40%, rgba(20,160,152,0.2) 0%, rgba(11,43,59,0.8) 85%);
      backdrop-filter: blur(1px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 2.5rem;
    }

    .hero-left {
      flex: 1 1 400px;
    }

    .hero-right {
      flex: 1 1 360px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.2rem;
    }

    h1 {
      font-size: clamp(2.4rem, 6vw, 3.6rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.2rem;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      max-width: 480px;
      margin-bottom: 2rem;
      line-height: 1.7;
    }

    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--coral-red);
      color: white;
      font-weight: 600;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      box-shadow: 0 10px 18px -8px rgba(248,92,60,0.5);
    }

    .btn-primary:hover {
      background: #e04a2a;
      transform: translateY(-2px);
      box-shadow: 0 16px 28px -8px rgba(248,92,60,0.6);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--tropical-teal);
      color: var(--tropical-teal);
      font-weight: 600;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: 0.25s;
    }

    .btn-secondary:hover {
      background: var(--tropical-teal);
      color: white;
    }

    .metric-card {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      border-radius: 18px;
      padding: 1.5rem 1rem;
      text-align: center;
      color: white;
      border: 1px solid rgba(255,255,255,0.2);
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--coral-red);
    }

    .metric-label {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: rgba(255,255,255,0.75);
    }

    /* 通用区块 */
    section {
      padding: 5rem 0;
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 2.5rem;
      color: var(--deep-ocean);
    }

    .service-grid {
      display: grid;
      grid-template-columns: 1fr 1.3fr 1fr;
      gap: 2rem;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2.2rem 1.8rem;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-hover-shadow);
    }

    .service-icon {
      font-size: 2.4rem;
      color: var(--tropical-teal);
      margin-bottom: 1.5rem;
    }

    .service-card h3 {
      font-size: 1.6rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    .service-desc {
      color: var(--text-muted);
      margin-bottom: 1.5rem;
      flex:1;
    }

    .data-tag {
      font-weight: 600;
      color: var(--deep-ocean);
      font-size: 0.9rem;
      background: #f0f6f8;
      padding: 0.2rem 1rem;
      border-radius: 30px;
      display: inline-block;
      align-self: flex-start;
    }

    /* 对比区 */
    .comparison {
      background: var(--deep-ocean);
      border-radius: 50px;
      margin: 3rem 0;
      padding: 4rem 2rem;
      color: white;
    }

    .comparison h2 {
      color: white;
      text-align: center;
    }

    .compare-grid {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
    }

    .compare-box {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: 28px;
      padding: 2rem;
      min-width: 220px;
      text-align: center;
    }

    .vs-badge {
      font-size: 2rem;
      font-weight: 800;
      color: var(--coral-red);
    }

    .up-arrow { color: var(--tropical-teal); }
    .down-arrow { color: #aaa; }

    /* FAQ */
    .accordion-title {
      font-weight: 600;
      color: var(--deep-ocean);
      background: white;
      border-radius: 14px;
      padding: 1.2rem 2rem;
      margin-bottom: 0.5rem;
      border: 1px solid var(--border-light);
      transition: 0.2s;
    }

    .accordion-title:hover {
      background: #f9fcfd;
    }

    .accordion-content {
      background: #f6f9fa;
      padding: 1.5rem 2rem;
      color: var(--text-muted);
    }

    /* CTA表单 */
    .cta-section {
      background: linear-gradient(180deg, #f6f9fa 0%, #ffffff 100%);
      border-radius: 50px;
      padding: 3rem;
    }

    .form-input {
      border: 1px solid var(--border-light);
      border-radius: 16px;
      padding: 0.9rem 1.5rem;
      width: 100%;
      transition: 0.2s;
    }

    .form-input:focus {
      border-color: var(--tropical-teal);
      box-shadow: 0 0 0 3px rgba(20,160,152,0.2);
      outline: none;
    }

    footer {
      background: var(--deep-ocean);
      color: rgba(255,255,255,0.8);
      padding: 3rem 0 1.5rem;
      border-radius: 40px 40px 0 0;
    }

    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: 1fr 1fr;
      }
      .capsule-nav {
        padding: 0.55rem 1.2rem;
      }
    }

    @media (max-width: 640px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .service-grid {
        grid-template-columns: 1fr;
      }
      .hero-right {
        grid-template-columns: 1fr 1fr;
      }
      h1 {
        font-size: 2.2rem;
      }
    }