/* roulang page: index */
:root {
      --primary: #0A1F2E;
      --secondary: #E94E1B;
      --accent: #00B4A6;
      --bg-warm: #F5F3EF;
      --bg-light: #FFFFFF;
      --bg-alt: #F0EDE8;
      --text-body: #2C3539;
      --text-muted: #6B7280;
      --border-light: #D1D5DB;
      --border-card: #E5E7EB;
      --shadow-card-hover: 0 8px 24px rgba(10,31,46,0.12);
      --shadow-nav: 0 2px 16px rgba(0,0,0,0.06);
      --font-heading: "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
      --font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      --font-display: "Bebas Neue", "Oswald", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --radius-sm: 4px;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.2;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: 0.08em;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      border: none;
      outline: none;
    }
    .btn:focus-visible, a:focus-visible, button:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.3s, height 0.3s, box-shadow 0.3s;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 24px;
      color: white;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color 0.3s;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--secondary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2z"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 2L2 22h20L12 2z"/></svg>') center/contain no-repeat;
      background-color: var(--secondary);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 600;
      color: rgba(255,255,255,0.9);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
      color: rgba(255,255,255,0.85);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--secondary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary-sm {
      background: var(--secondary);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-size: 14px;
    }
    .btn-primary-sm:hover {
      background: #C43D12;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
    }
    /* 滚动后样式 */
    .site-header.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      height: 56px;
    }
    .site-header.scrolled .logo {
      color: var(--primary);
    }
    .site-header.scrolled .nav-links a {
      color: var(--text-body);
    }
    .site-header.scrolled .hamburger {
      color: var(--primary);
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      border-top: 1px solid var(--border-light);
      height: 56px;
      z-index: 99;
      grid-template-columns: repeat(4, 1fr);
      align-items: center;
      justify-items: center;
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 10px;
      color: var(--text-muted);
      gap: 2px;
      font-weight: 500;
    }
    .mobile-bottom-nav a.active {
      color: var(--secondary);
    }
    /* 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(180deg, rgba(10,31,46,0.75) 0%, rgba(10,31,46,0.3) 100%);
    }
    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
      width: 100%;
    }
    .hero-title {
      font-size: 56px;
      font-weight: 800;
      font-family: var(--font-display);
      letter-spacing: 0.05em;
      text-transform: uppercase;
      line-height: 1.1;
      margin-bottom: 16px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      font-weight: 400;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--secondary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-size: 16px;
    }
    .btn-primary:hover { background: #C43D12; }
    .btn-ghost {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 30px;
      border-radius: var(--radius-sm);
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary);
    }
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .big-number {
      font-size: 120px;
      font-family: var(--font-display);
      color: rgba(233,78,27,0.25);
      line-height: 1;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: pulse 2s infinite;
    }
    @keyframes pulse { 0%,100%{opacity:1;} 50%{opacity:0.5;} }
    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
    }
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .adv-item {
      text-align: center;
    }
    .adv-number {
      font-size: 64px;
      font-family: var(--font-display);
      color: var(--secondary);
      line-height: 1;
    }
    .adv-label {
      font-weight: 700;
      font-size: 18px;
      margin: 8px 0;
    }
    /* 服务非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 8fr 4fr;
      gap: 24px;
    }
    .service-wide {
      background: white;
      border: 1px solid var(--border-card);
      border-radius: var(--radius-sm);
      display: flex;
      overflow: hidden;
      transition: var(--transition);
    }
    .service-wide:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: var(--primary);
    }
    .service-img {
      width: 45%;
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      min-height: 240px;
    }
    .service-info {
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .service-narrow {
      background: #F0EDE8;
      border-radius: var(--radius-sm);
      padding: 32px;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .service-narrow:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .row-reverse {
      grid-template-columns: 4fr 8fr;
    }
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .cases-scroll::-webkit-scrollbar { display: none; }
    .case-card {
      flex: 0 0 360px;
      background: white;
      border: 1px solid var(--border-card);
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: var(--primary);
    }
    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
    }
    .case-text {
      padding: 20px;
    }
    /* 数据看板深色 */
    .dark-block {
      background: var(--primary);
      color: white;
      padding: 100px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 64px;
      font-family: var(--font-display);
      color: var(--accent);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
    }
    /* CTA渐变 */
    .cta-gradient {
      background: linear-gradient(135deg, #0A1F2E 0%, #E94E1B 100%);
      color: white;
      text-align: center;
      padding: 100px 24px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #9CA3AF;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .hero-content { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .btn-primary-sm.desktop { display: none; }
      .hamburger { display: block; }
      .mobile-bottom-nav { display: grid; }
      section { padding: 64px 0; }
      .hero-title { font-size: 36px; }
      .services-grid, .row-reverse { grid-template-columns: 1fr; }
      .service-wide { flex-direction: column; }
      .service-img { width: 100%; height: 200px; }
      .case-card { flex: 0 0 280px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }