/* roulang page: index */
:root {
      --primary: #1A1D23;
      --accent: #E85D3A;
      --accent-hover: #D14A2A;
      --bg: #F4F0EB;
      --surface: #FFFFFF;
      --text-main: #2C2F36;
      --text-muted: #7C7F86;
      --text-inverse: #FFFFFF;
      --border-light: #E0DDD8;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 6px 20px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 4px 8px rgba(0,0,0,0.06), 0 12px 32px rgba(0,0,0,0.1);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.06);
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      color: var(--primary);
    }
    
    h1 {
      font-weight: 700;
      font-size: clamp(36px, 5vw, 60px);
      line-height: 1.2;
      letter-spacing: -0.02em;
    }
    
    h2 {
      font-weight: 600;
      font-size: 32px;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    
    h2::before {
      content: '';
      display: inline-block;
      width: 4px;
      height: 28px;
      background: var(--accent);
      border-radius: 2px;
    }
    
    h3 {
      font-weight: 600;
      font-size: 20px;
    }
    
    p {
      max-width: 65ch;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    
    img {
      max-width: 100%;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition-smooth);
      border: none;
      outline: none;
    }
    
    .btn-primary {
      background: var(--accent);
      color: var(--text-inverse);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }
    
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }
    
    .btn-secondary:hover {
      background: var(--primary);
      color: var(--text-inverse);
    }
    
    .btn-pill {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-size: 15px;
    }
    
    .btn-pill:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    
    .tag {
      display: inline-block;
      background: var(--accent);
      color: white;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      letter-spacing: 0.3px;
    }
    
    /* 导航 Dock */
    .nav-dock {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: min(92%, 720px);
      background: rgba(244, 240, 235, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 40px;
      box-shadow: var(--shadow-nav);
      border: 1px solid rgba(0,0,0,0.04);
      padding: 8px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      z-index: 1000;
      transition: background 0.3s, box-shadow 0.3s;
    }
    
    .nav-dock.scrolled {
      background: rgba(244, 240, 235, 0.92);
    }
    
    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      font-weight: 500;
      font-size: 14px;
      color: var(--text-main);
    }
    
    .nav-links a:hover {
      color: var(--accent);
    }
    
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }
    
    /* Hero */
    .hero {
      padding: 160px 0 120px;
      display: flex;
      align-items: center;
      gap: 60px;
    }
    
    .hero-left {
      flex: 1 1 55%;
    }
    
    .hero-left p {
      font-size: 18px;
      color: var(--text-muted);
      margin: 24px 0 32px;
      max-width: 480px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .hero-right {
      flex: 1 1 45%;
      position: relative;
    }
    
    .hero-img {
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    }
    
    .hero-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    
    .floating-stat {
      position: absolute;
      bottom: -20px;
      left: -20px;
      background: var(--surface);
      border-radius: 10px;
      padding: 16px 20px;
      box-shadow: var(--shadow-card);
      transform: rotate(-2deg);
      font-weight: 700;
      font-size: 18px;
      color: var(--primary);
    }
    
    .floating-stat span {
      color: var(--accent);
      font-size: 24px;
      font-family: var(--font-number);
    }
    
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin: 40px 0 60px;
    }
    
    .feature-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
      border-left: 3px solid transparent;
    }
    
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-left: 3px solid var(--accent);
    }
    
    .feature-card i {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    
    .feature-card h3 {
      margin-bottom: 12px;
    }
    
    .feature-card p {
      color: var(--text-muted);
      font-size: 15px;
      flex: 1;
    }
    
    .feature-card.img-card {
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      position: relative;
      justify-content: flex-end;
      color: white;
      min-height: 360px;
    }
    
    .img-card-overlay {
      background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, transparent 60%);
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 32px;
      border-radius: 0 0 var(--radius-card) var(--radius-card);
    }
    
    .img-card-overlay h3, .img-card-overlay p {
      color: white;
    }
    
    .center-cta {
      text-align: center;
      margin-top: 40px;
    }
    
    /* 案例瀑布 */
    .case-waterfall {
      columns: 3;
      column-gap: 24px;
      margin: 40px 0;
    }
    
    .case-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      break-inside: avoid;
      margin-bottom: 24px;
      transition: transform 0.4s, box-shadow 0.4s;
    }
    
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    
    .case-card img {
      width: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    
    .case-card:hover img {
      transform: scale(1.03);
    }
    
    .case-content {
      padding: 24px;
    }
    
    .case-content .tag {
      margin-bottom: 12px;
    }
    
    .case-content h3 {
      margin-bottom: 8px;
    }
    
    .case-stat {
      font-weight: 700;
      color: var(--accent);
      font-size: 20px;
      margin-top: 12px;
    }
    
    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 24px;
      margin: 40px 0;
    }
    
    .compare-col {
      flex: 1;
      border-radius: var(--radius-card);
      padding: 40px;
      display: flex;
      flex-direction: column;
    }
    
    .compare-left {
      background: #F4F0EB;
      border: 1px solid #E0DDD8;
    }
    
    .compare-right {
      background: var(--surface);
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-card);
    }
    
    .compare-list {
      list-style: none;
      margin: 24px 0;
    }
    
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    
    .compare-left li i {
      color: #999;
    }
    
    .compare-right li i {
      color: var(--accent);
    }
    
    .btn-block {
      margin-top: auto;
      align-self: flex-start;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s;
      color: var(--text-muted);
      padding-top: 0;
    }
    
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 12px;
    }
    
    .faq-icon {
      transition: transform 0.4s;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 20px;
      position: relative;
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    
    .cta-banner h2 {
      color: white;
      justify-content: center;
    }
    
    .cta-banner h2::before {
      display: none;
    }
    
    .cta-banner p {
      color: #B0B3B8;
      margin: 16px auto 32px;
      font-size: 18px;
    }
    
    /* Footer */
    .footer {
      background: var(--primary);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    .footer-logo {
      font-weight: 700;
      font-size: 20px;
      color: white;
      margin-bottom: 12px;
    }
    
    .footer a {
      color: #B0B3B8;
      font-size: 14px;
    }
    
    .footer a:hover {
      color: white;
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 20px;
      font-size: 12px;
      display: flex;
      justify-content: space-between;
    }
    
    /* 响应式 */
    @media (max-width: 1023px) {
      .container { padding: 0 24px; }
      .hero { flex-direction: column; gap: 40px; padding: 140px 0 80px; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .case-waterfall { columns: 2; }
      .compare-row { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    
    @media (max-width: 767px) {
      .nav-dock {
        top: auto;
        bottom: 16px;
        width: 92%;
        padding: 10px 20px;
        border-radius: 40px;
      }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .features-grid { grid-template-columns: 1fr; }
      .case-waterfall { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
      h2 { font-size: 26px; }
    }