/* roulang page: index */
:root {
      --primary-deep: #0B2B40;
      --primary-dark: #05161E;
      --accent-coral: #FF6B4A;
      --accent-hover: #E55A3A;
      --bg-light: #F4F7F9;
      --white-pure: #FFFFFF;
      --text-dark: #1A2A36;
      --text-muted: #5E6F7E;
      --border-light: #E0E6EA;
      --shadow-card: 0 4px 20px rgba(11,43,64,0.06);
      --shadow-hover: 0 12px 32px rgba(11,43,64,0.12);
      --radius-card: 16px;
      --radius-button: 30px;
      --radius-input: 8px;
      --transition: all 0.25s ease;
      --glass-bg: rgba(255,255,255,0.12);
      --glass-border: rgba(255,255,255,0.2);
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-weight: 400;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.2px;
    }
    
    a {
      color: var(--primary-deep);
      text-decoration: none;
      transition: var(--transition);
    }
    
    a:hover {
      color: var(--accent-coral);
      text-decoration: underline;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 玻璃导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--glass-border);
      transition: var(--transition);
      padding: 0 24px;
    }
    
    .glass-nav.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 15px rgba(0,0,0,0.05);
      border-bottom: 1px solid rgba(11,43,64,0.08);
    }
    
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      height: 72px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      text-decoration: none;
    }
    
    .logo i {
      font-size: 1.8rem;
      color: var(--accent-coral);
      transition: var(--transition);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    
    .nav-links a {
      font-weight: 500;
      color: var(--primary-deep);
      font-size: 0.95rem;
    }
    
    .nav-cta {
      background: var(--accent-coral);
      color: white !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(255,107,74,0.3);
      text-decoration: none;
      display: inline-block;
    }
    
    .nav-cta:hover {
      background: var(--accent-hover);
      color: white !important;
      text-decoration: none;
      box-shadow: 0 6px 18px rgba(255,107,74,0.4);
    }
    
    /* Hero */
    #hero {
      height: 100vh;
      min-height: 700px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,43,64,0.85) 0%, rgba(5,22,30,0.9) 100%);
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-left: 8%;
    }
    
    .hero-content h1 {
      font-size: 3.4rem;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: white;
      letter-spacing: 2px;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    
    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
      max-width: 520px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--accent-coral);
      color: white;
      border: none;
      padding: 14px 34px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(255,107,74,0.4);
      cursor: pointer;
    }
    
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(255,107,74,0.5);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 34px;
      border-radius: 30px;
      font-weight: 600;
      transition: var(--transition);
    }
    
    .btn-outline:hover {
      background: white;
      color: var(--primary-deep);
    }
    
    .floating-card {
      position: absolute;
      right: 8%;
      bottom: 15%;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.25);
      border-radius: 20px;
      padding: 24px 28px;
      color: white;
      display: flex;
      gap: 30px;
      z-index: 3;
    }
    
    .floating-stat h3 {
      font-size: 2.2rem;
      color: var(--accent-coral);
      margin-bottom: 4px;
      font-weight: 700;
    }
    
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    
    .section-title h2 {
      font-size: 2.4rem;
      color: var(--primary-deep);
      margin-bottom: 0.5rem;
    }
    
    .section-title p {
      color: var(--text-muted);
      font-size: 1.1rem;
    }
    
    /* 数据看板 */
    #metrics {
      background: #0A1C2E;
      color: white;
    }
    
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .metric-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 20px;
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition);
    }
    
    .metric-card:hover {
      background: rgba(255,255,255,0.1);
      transform: translateY(-5px);
    }
    
    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-coral);
      line-height: 1.2;
    }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
      border-top: 4px solid var(--accent-coral);
    }
    
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    
    .card-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    
    .card-body {
      padding: 24px;
    }
    
    .card-body h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }
    
    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 80px 1fr;
      align-items: center;
      gap: 24px;
    }
    
    .compare-card {
      background: white;
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    
    .compare-card.old {
      background: #f0f3f6;
      opacity: 0.9;
    }
    
    .compare-card.new {
      border: 2px solid var(--accent-coral);
      box-shadow: 0 8px 30px rgba(255,107,74,0.15);
    }
    
    .vs-badge {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-coral);
      text-align: center;
    }
    
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 14px;
      margin-bottom: 16px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
      overflow: hidden;
    }
    
    .faq-question {
      padding: 22px 28px;
      font-weight: 700;
      color: var(--primary-deep);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    .faq-answer {
      padding: 0 28px 22px;
      color: var(--text-muted);
      display: none;
    }
    
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    
    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      margin-bottom: 18px;
      transition: var(--transition);
    }
    
    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--accent-coral);
      box-shadow: 0 0 0 3px rgba(255,107,74,0.2);
      outline: none;
    }
    
    .contact-info-card {
      background: var(--primary-deep);
      color: white;
      border-radius: 20px;
      padding: 36px;
    }
    
    footer {
      background: #05161E;
      color: #8A9BA8;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hero-content h1 { font-size: 2.4rem; }
      .floating-card { position: static; margin-top: 30px; justify-content: center; }
      .metrics-grid, .services-grid { grid-template-columns: 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .vs-badge { margin: 20px 0; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }