/* roulang page: index */
:root {
      --primary: #FF5C00;
      --primary-dark: #E04E00;
      --secondary: #1E0A2E;
      --accent: #C8FF00;
      --bg-warm: #F7F4F0;
      --card-bg: #FFFFFF;
      --text-main: #1E0A2E;
      --text-secondary: #5A4E6B;
      --text-on-primary: #FFFFFF;
      --border-light: rgba(30,10,46,0.08);
      --shadow-card: 0 2px 12px rgba(30,10,46,0.06);
      --shadow-card-hover: 0 8px 24px rgba(30,10,46,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
      --transition: all 0.2s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      margin: 0;
      line-height: 1.8;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 卡片化导航面板 */
    .nav-panel {
      background: var(--bg-warm);
      padding: 12px 20px;
      border-radius: var(--radius-card);
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 12px auto 0;
      box-shadow: var(--shadow-card);
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      position: sticky;
      top: 12px;
      z-index: 40;
      transition: box-shadow 0.3s;
    }
    
    .nav-panel.scrolled {
      box-shadow: 0 4px 20px rgba(30,10,46,0.12);
    }
    
    .logo-brand {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-brand i {
      color: var(--primary);
      font-size: 1.8rem;
    }
    
    .nav-links {
      display: flex;
      gap: 6px;
      align-items: center;
      flex-wrap: wrap;
    }
    
    .nav-item {
      background: transparent;
      border: none;
      padding: 8px 14px;
      border-radius: 8px;
      color: var(--text-main);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
    }
    .nav-item i {
      font-size: 0.9rem;
      color: var(--primary);
    }
    .nav-item:hover {
      background: #FFEDE0;
      color: var(--primary);
    }
    
    .btn-nav-cta {
      background: var(--primary);
      color: white;
      border-radius: 8px;
      padding: 10px 20px;
      font-weight: 600;
      border: none;
      margin-left: 10px;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn-nav-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(255,92,0,0.3);
    }
    
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
    }
    
    /* Hero */
    .hero {
      padding: 60px 0 40px;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 400px;
    }
    .hero h1 {
      font-size: 2.4rem;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    .hero .sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }
    .hero-visual {
      flex: 1 1 400px;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      min-height: 280px;
      position: relative;
      background-color: #EADCCB;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      border: none;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(255,92,0,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 16px rgba(224,78,0,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: #FFF2E6;
    }
    
    /* metrics */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
      margin: 30px 0 60px;
    }
    .metric-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 24px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }
    .metric-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    .metric-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 6px;
    }
    
    /* services */
    .services-section h2, .faq-section h2, .compare-section h2 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #FFEDE0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      color: white;
      font-size: 1.8rem;
    }
    
    /* compare */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .plan-highlight {
      border-top: 4px solid var(--primary);
    }
    
    /* FAQ */
    .accordion-faq {
      margin-top: 20px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: 8px;
      margin-bottom: 10px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--bg-warm);
      border-radius: 8px;
    }
    .faq-answer {
      padding: 0 20px 16px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* contact */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    
    footer {
      background: var(--secondary);
      color: #ddd;
      padding: 40px 0 20px;
      margin-top: 60px;
    }
    
    @media (max-width: 1024px) {
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .compare-table { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
      .hero { flex-direction: column; }
      .contact-grid { grid-template-columns: 1fr; }
    }