/* roulang page: index */
:root {
      --primary-deep: #0A1F2E;
      --primary-surface: #0D2B3E;
      --accent-green: #00C897;
      --accent-green-hover: #00A87D;
      --accent-gold: #F5A623;
      --bg-light: #F7F9FC;
      --card-white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E9F0;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-glass: 16px;
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --transition-base: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: var(--font-sans);
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      outline: none;
    }

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      background: #ffffff;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      height: 64px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent-green);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"/><polygon points="12,2 15,9 22,9 16,14 18,21 12,17 6,21 8,14 2,9 9,9"/></svg>') center/cover;
      background: var(--accent-green);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      font-weight: 500;
      color: var(--text-muted);
    }

    .nav-links a {
      position: relative;
      padding: 0.25rem 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-green);
      transition: width 0.2s;
    }

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

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

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

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A1F2E 0%, #0D2B3E 100%);
      position: relative;
      overflow: hidden;
      padding: 5rem 0 4rem;
      color: white;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: radial-gradient(circle at 20% 40%, rgba(0,200,151,0.08) 0%, transparent 35%);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-left h1 {
      font-size: 42px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 1.25rem;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
    }

    .btn-primary {
      background: var(--accent-green);
      color: white;
      padding: 0.8rem 2rem;
      font-weight: 600;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 12px rgba(0,200,151,0.3);
    }

    .btn-primary:hover {
      background: var(--accent-green-hover);
      transform: scale(1.02);
      color: white;
    }

    .hero-right {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .data-cards {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .glass-card {
      background: rgba(10, 31, 46, 0.7);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-glass);
      padding: 1.25rem 1rem;
      flex: 1;
      min-width: 100px;
      text-align: center;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .glass-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.1;
    }

    .glass-label {
      font-size: 0.85rem;
      opacity: 0.8;
      margin-top: 0.25rem;
    }

    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      height: 180px;
      border-radius: 16px;
      opacity: 0.9;
      border: 1px solid rgba(255,255,255,0.2);
    }

    /* 板块通用 */
    .section {
      padding: 4.5rem 0;
    }

    .section h2 {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 0.75rem;
      color: var(--primary-deep);
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 2.5rem;
      font-size: 1.1rem;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      border: 1px solid transparent;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent-green);
    }

    .service-icon {
      font-size: 2.2rem;
      color: var(--accent-green);
      margin-bottom: 1.5rem;
    }

    .service-card h3 {
      font-size: 1.35rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    .service-card p {
      color: var(--text-muted);
      margin-bottom: 1.2rem;
    }

    .text-link {
      color: var(--accent-green);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    /* 对比区 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      gap: 1.5rem;
      background: white;
      border-radius: 20px;
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
    }

    .compare-col {
      background: #f0f3f7;
      border-radius: 16px;
      padding: 1.8rem;
    }

    .compare-col.highlight {
      background: #eafff7;
      border: 1px solid var(--accent-green);
    }

    .vs-badge {
      background: var(--accent-gold);
      color: #0A1F2E;
      font-weight: 700;
      font-size: 1.3rem;
      width: 56px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      box-shadow: 0 6px 16px rgba(245,166,35,0.3);
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 0.7rem 0;
      border-bottom: 1px dashed #ccc;
    }

    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 0.8rem;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .accordion-title {
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 1.5rem;
      background: white;
      border-radius: 12px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      cursor: pointer;
    }

    .accordion-content {
      padding: 0 1.5rem 1.2rem;
      color: var(--text-muted);
    }

    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 2.5rem;
      background: white;
      border-radius: 20px;
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
    }

    .form-input {
      margin-bottom: 1.2rem;
    }

    .form-input input, .form-input select, .form-input textarea {
      width: 100%;
      border: 1px solid #ddd;
      border-radius: 8px;
      padding: 0.75rem;
      font-family: inherit;
    }

    .contact-info {
      background: #f0f5fa;
      border-radius: 16px;
      padding: 2rem;
    }

    .footer {
      background: var(--primary-deep);
      color: white;
      padding: 2.5rem 0 1.5rem;
    }

    .footer a {
      color: #ccc;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .compare-row { grid-template-columns: 1fr; }
      .vs-badge { margin: 0 auto; }
    }

    @media (max-width: 640px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .services-grid, .contact-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.2rem; }
    }