/* roulang page: index */
:root {
      --primary: #1A1A1A;
      --accent: #C8A96E;
      --accent-hover: #B8995E;
      --bg: #FAF8F5;
      --card-bg: #FFFFFF;
      --dark-bg: #2C2C2C;
      --text-title: #1A1A1A;
      --text-body: #4A4A4A;
      --text-muted: #8C8C8C;
      --text-light: #FFFFFF;
      --text-light-dim: #F0E6D2;
      --border-light: #E6E0D8;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 6px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-en: "Inter", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-cn);
      background-color: var(--bg);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-cn);
      color: var(--text-title);
      margin-top: 0;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .button {
      font-family: var(--font-cn);
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      z-index: 100;
      padding: 14px 0;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--primary);
      white-space: nowrap;
    }
    .logo-diamond {
      width: 10px;
      height: 10px;
      background: var(--accent);
      transform: rotate(45deg);
      margin-left: 2px;
    }
    .nav-center {
      display: flex;
      gap: 2.2rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-center a {
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-center a:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 1.4rem;
    }
    .search-icon {
      font-size: 1.1rem;
      color: var(--text-muted);
      transition: color 0.2s;
    }
    .search-icon:hover {
      color: var(--accent);
    }
    .login-link {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .login-link:hover {
      color: var(--primary);
    }
    .btn-highlight {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 0 0 0 rgba(200,169,110,0.4);
      animation: pulse-glow 2.5s infinite;
      transition: background 0.2s, transform 0.2s;
      white-space: nowrap;
    }
    .btn-highlight:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      color: white;
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 0 0 rgba(200,169,110,0.4); }
      70% { box-shadow: 0 0 0 8px rgba(200,169,110,0); }
      100% { box-shadow: 0 0 0 0 rgba(200,169,110,0); }
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary);
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background: var(--bg);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-left h1 span {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 1.1rem;
      color: #6A6A6A;
      max-width: 400px;
      margin-bottom: 2rem;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline {
      border: 1.5px solid var(--accent);
      color: var(--accent);
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(200,169,110,0.1);
      color: var(--accent-hover);
      border-color: var(--accent-hover);
    }
    .hero-right {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 400px;
    }
    .hero-img-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(26,26,26,0.2) 0%, rgba(26,26,26,0.5) 100%);
    }
    .hero-watermark {
      position: absolute;
      left: 20px;
      bottom: 20px;
      font-family: var(--font-en);
      font-size: 0.9rem;
      letter-spacing: 0.2em;
      color: rgba(255,255,255,0.6);
      writing-mode: vertical-rl;
    }

    /* 亮点网格 */
    .highlights-section {
      padding: 80px 0;
      background: var(--card-bg);
    }
    .highlights-grid {
      display: grid;
      grid-template-columns: 4fr 4fr 4fr;
      gap: 30px;
    }
    .highlight-card {
      background: var(--card-bg);
      padding: 28px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.2s, transform 0.2s;
      border: 1px solid var(--border-light);
    }
    .highlight-card.middle {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-md);
    }
    .highlight-icon {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 18px;
    }
    .highlight-title {
      font-weight: 600;
      font-size: 1.25rem;
      margin-bottom: 8px;
    }
    .highlight-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin-bottom: 16px;
    }
    .decor-line {
      width: 40px;
      height: 2px;
      background: var(--accent);
    }

    /* 案例瀑布流 */
    .cases-section {
      padding: 80px 0;
    }
    .cases-masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.3s, transform 0.2s;
      position: relative;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 100%;
      display: block;
      transition: transform 0.4s;
      object-fit: cover;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(26,26,26,0.75));
      padding: 24px;
      color: white;
    }
    .case-title {
      font-weight: 600;
      font-size: 1.1rem;
      margin-bottom: 4px;
    }
    .case-tag {
      font-size: 0.8rem;
      opacity: 0.9;
    }

    /* 对比表 */
    .compare-section {
      padding: 80px 0;
      background: var(--card-bg);
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      position: relative;
    }
    .compare-divider {
      position: absolute;
      left: 50%;
      top: 0;
      bottom: 0;
      width: 1px;
      border-left: 2px dashed var(--border-light);
      transform: translateX(-50%);
    }
    .compare-left, .compare-right {
      padding: 32px;
    }
    .compare-left {
      background: #F5F5F5;
      color: var(--text-muted);
    }
    .compare-right {
      background: white;
      color: var(--text-title);
    }
    .compare-row {
      display: flex;
      align-items: center;
      padding: 16px 0;
      gap: 12px;
      border-bottom: 1px solid rgba(0,0,0,0.03);
    }
    .compare-row:last-child {
      border-bottom: none;
    }
    .compare-right .compare-row {
      border-left: 3px solid var(--accent);
      padding-left: 16px;
    }
    .compare-icon {
      color: var(--accent);
      width: 20px;
    }

    /* 数据带 */
    .stats-band {
      background: var(--primary);
      padding: 60px 0;
      color: white;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      font-family: var(--font-en);
      color: var(--accent);
    }
    .stat-label {
      font-size: 0.85rem;
      letter-spacing: 0.1em;
      color: var(--text-light-dim);
      margin-top: 6px;
    }

    /* FAQ */
    .faq-section {
      padding: 80px 0;
    }
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      background: transparent;
      border: none;
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-title);
    }
    .accordion-title:hover {
      color: var(--accent);
    }
    .accordion-content {
      background: var(--bg);
      padding: 20px;
      color: var(--text-body);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A1A1A 0%, #3A3A3A 100%);
      padding: 80px 20px;
      text-align: center;
      position: relative;
      color: white;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="4" height="4"><rect width="4" height="4" fill="white" opacity="0.03"/></svg>');
    }
    .cta-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 28px;
      position: relative;
    }
    .cta-btns {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      position: relative;
    }

    /* 页脚 */
    .site-footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer-col h4 {
      color: white;
      font-size: 0.95rem;
      font-weight: 600;
      margin-bottom: 16px;
      position: relative;
    }
    .footer-col h4::after {
      content: '';
      display: block;
      width: 24px;
      height: 2px;
      background: var(--accent);
      margin-top: 6px;
    }
    .footer-links a {
      display: block;
      color: #B0B0B0;
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 25px;
      text-align: center;
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        gap: 40px;
      }
      .cases-masonry {
        column-count: 2;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-center, .nav-right .login-link, .nav-right .btn-highlight {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-right {
        min-height: 280px;
      }
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .highlight-card.middle {
        transform: none;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .compare-divider {
        display: none;
      }
      .stats-grid {
        gap: 24px;
      }
      .cases-masonry {
        column-count: 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }