/* roulang page: index */
:root {
      --color-primary: #1A0E0B;
      --color-accent: #C8A45C;
      --color-secondary: #2D1F1A;
      --color-bg: #F7F4EF;
      --color-text: #1A0E0B;
      --color-text-secondary: #5C4A3D;
      --color-text-muted: #8C7B6E;
      --color-gold: #D4AF37;
      --color-success: #2E5C4A;
      --color-border: #E5DED4;
      --color-white: #FFFFFF;
      --color-overlay-dark: rgba(26,14,11,0.85);
      --radius-card: 20px;
      --radius-button: 12px;
      --radius-badge: 50px;
      --radius-image: 16px;
      --shadow-card: 0 8px 32px rgba(26,14,11,0.12), 0 2px 8px rgba(26,14,11,0.06);
      --shadow-button: 0 6px 20px rgba(200,164,92,0.4);
      --shadow-nav: 0 1px 0 rgba(26,14,11,0.06), 0 4px 16px rgba(26,14,11,0.04);
      --shadow-badge: 0 4px 12px rgba(212,175,55,0.3);
      --font-serif: 'Noto Serif SC', 'STSong', 'Songti SC', serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'DM Serif Display', 'Noto Serif SC', serif;
      --font-display: 'Cormorant Garamond', 'Playfair Display', serif;
      --transition-smooth: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }

    button, input {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(247, 244, 239, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(26,14,11,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      transition: background 0.3s, box-shadow 0.3s;
    }

    .navbar.scrolled {
      background: rgba(247, 244, 239, 0.98);
      box-shadow: var(--shadow-nav);
    }

    .nav-left {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-primary);
      line-height: 1;
      height: 40px;
    }

    .logo-icon {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: 2rem;
      color: var(--color-accent);
      letter-spacing: 0.02em;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--color-text);
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-accent);
      transition: width var(--transition-smooth);
    }

    .nav-links a:hover {
      color: var(--color-accent);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .btn-nav {
      background: linear-gradient(135deg, #C8A45C 0%, #B8943D 100%);
      color: var(--color-primary);
      padding: 10px 24px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      cursor: pointer;
      transition: all var(--transition-smooth);
      box-shadow: 0 2px 8px rgba(200,164,92,0.25);
      white-space: nowrap;
    }

    .btn-nav:hover {
      box-shadow: var(--shadow-button);
      transform: translateY(-1px);
      filter: brightness(1.05);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-accent);
      border-radius: 2px;
      transition: all 0.3s;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      padding-top: 64px;
      background: var(--color-bg);
    }

    .hero-content {
      padding: 60px 48px 60px 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 24px;
    }

    .hero-tag {
      font-size: 0.85rem;
      letter-spacing: 0.1em;
      color: var(--color-accent);
      font-weight: 500;
      text-transform: uppercase;
    }

    .hero h1 {
      font-family: var(--font-serif);
      font-size: clamp(2.2rem, 5vw, 4rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--color-primary);
      line-height: 1.25;
    }

    .hero-sub {
      font-size: 1.1rem;
      color: var(--color-text-secondary);
      max-width: 90%;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all var(--transition-smooth);
      border: none;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #C8A45C 0%, #B8943D 100%);
      color: var(--color-primary);
      box-shadow: 0 4px 12px rgba(200,164,92,0.3);
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-button);
      transform: translateY(-2px);
      filter: brightness(1.05);
    }

    .btn-ghost {
      background: transparent;
      color: var(--color-accent);
      border: 2px solid var(--color-accent);
    }

    .btn-ghost:hover {
      background: rgba(200,164,92,0.1);
      transform: translateY(-2px);
    }

    .hero-visual {
      position: relative;
      height: 100%;
      min-height: 500px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .hero-visual::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,14,11,0.85) 0%, rgba(45,31,26,0.4) 100%);
    }

    .badge-hero {
      position: relative;
      z-index: 2;
      background: linear-gradient(145deg, #D4AF37 0%, #C8A45C 100%);
      color: var(--color-primary);
      font-weight: 700;
      font-size: 1rem;
      padding: 12px 28px;
      border-radius: var(--radius-badge);
      box-shadow: var(--shadow-badge);
      font-family: var(--font-number);
      white-space: nowrap;
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 64px;
    }

    .section-header h2 {
      font-family: var(--font-serif);
      font-size: clamp(1.8rem, 3vw, 2.6rem);
      font-weight: 600;
      color: var(--color-primary);
      margin-bottom: 12px;
    }

    .section-header p {
      color: var(--color-text-muted);
      font-size: 1.05rem;
    }

    /* 核心服务 */
    .services-grid {
      display: grid;
      grid-template-columns: 5fr 3.5fr;
      gap: 28px;
      align-items: start;
    }

    .services-col-right {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .card-service {
      background: var(--color-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: 0 2px 12px rgba(26,14,11,0.04);
      transition: all var(--transition-smooth);
      border-left: 4px solid var(--color-accent);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .card-service:hover {
      box-shadow: var(--shadow-card);
      transform: translateY(-4px);
    }

    .card-service-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-image);
      margin-bottom: 8px;
    }

    .card-service h3 {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--color-primary);
    }

    .card-service p {
      color: var(--color-text-secondary);
      line-height: 1.7;
    }

    .badge-inline {
      display: inline-flex;
      align-items: center;
      background: linear-gradient(145deg, #D4AF37 0%, #C8A45C 100%);
      color: var(--color-primary);
      font-weight: 700;
      padding: 4px 14px;
      border-radius: var(--radius-badge);
      font-size: 0.85rem;
      width: fit-content;
    }

    .btn-text {
      color: var(--color-accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: all var(--transition-smooth);
      font-size: 0.95rem;
    }

    .btn-text:hover {
      text-decoration: underline;
      text-underline-offset: 4px;
      color: var(--color-gold);
    }

    /* 优势 */
    .advantages-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .data-wall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .data-item {
      display: flex;
      flex-direction: column;
    }

    .data-number {
      font-family: var(--font-number);
      font-size: clamp(2rem, 4vw, 3.2rem);
      font-weight: 700;
      color: var(--color-gold);
      line-height: 1.1;
    }

    .data-label {
      color: var(--color-text-secondary);
      font-weight: 500;
      margin-top: 4px;
    }

    .advantage-list {
      display: flex;
      flex-direction: column;
      gap: 36px;
    }

    .advantage-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .advantage-icon {
      font-size: 1.8rem;
      color: var(--color-accent);
      flex-shrink: 0;
    }

    .advantage-text h4 {
      font-weight: 600;
      margin-bottom: 6px;
    }

    .advantage-text p {
      color: var(--color-text-secondary);
    }

    /* 案例横向滚动 */
    .cases-wrapper {
      position: relative;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
      display: flex;
      gap: 24px;
      padding-bottom: 16px;
      margin-right: -24px;
      padding-right: 24px;
    }

    .cases-wrapper::-webkit-scrollbar {
      display: none;
    }

    .case-card {
      flex: 0 0 340px;
      scroll-snap-align: start;
      background: var(--color-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 2px 12px rgba(26,14,11,0.04);
      transition: all var(--transition-smooth);
    }

    .case-card:hover {
      box-shadow: var(--shadow-card);
      transform: translateY(-4px);
    }

    .case-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      font-weight: 600;
      margin-bottom: 6px;
    }

    .case-tag {
      font-size: 0.8rem;
      color: var(--color-accent);
      font-weight: 500;
      margin-top: 8px;
    }

    .cases-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      margin-bottom: 40px;
    }

    /* 方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }

    .card-solution {
      background: var(--color-secondary);
      border-radius: var(--radius-card);
      padding: 36px;
      color: var(--color-white);
      border: 1px solid var(--color-border);
      display: flex;
      flex-direction: column;
      gap: 18px;
      transition: all var(--transition-smooth);
    }

    .card-solution.featured {
      border: 2px solid var(--color-accent);
    }

    .card-solution h3 {
      color: var(--color-accent);
      font-family: var(--font-serif);
      font-size: 1.5rem;
    }

    .card-solution ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      color: #E5DED4;
    }

    .card-solution li::before {
      content: '✓ ';
      color: var(--color-accent);
      font-weight: 700;
      margin-right: 6px;
    }

    .badge-featured {
      background: var(--color-accent);
      color: var(--color-primary);
      font-weight: 600;
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      width: fit-content;
    }

    /* FAQ */
    .faq-row {
      display: grid;
      grid-template-columns: 4fr 8fr;
      gap: 48px;
    }

    .faq-accordion details {
      border-bottom: 1px solid var(--color-border);
      padding: 18px 0;
    }

    .faq-accordion summary {
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--color-text);
    }

    .faq-accordion summary::-webkit-details-marker {
      display: none;
    }

    .faq-accordion details[open] summary {
      color: var(--color-accent);
    }

    .faq-answer {
      margin-top: 12px;
      color: var(--color-text-secondary);
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(120deg, #1A0E0B 0%, #3D2218 100%);
      padding: 80px 0;
      text-align: center;
    }

    .cta-banner h2 {
      color: white;
      font-family: var(--font-serif);
      font-size: 2rem;
      margin-bottom: 12px;
    }

    .cta-banner p {
      color: #D4CDBF;
      margin-bottom: 28px;
    }

    .cta-small {
      font-size: 0.85rem;
      color: var(--color-text-muted);
      margin-top: 12px;
    }

    /* 页脚 */
    .footer {
      background: var(--color-primary);
      padding: 60px 0 0;
      color: #C8BFB2;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    .footer h4 {
      color: var(--color-accent);
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer a {
      color: #C8BFB2;
      display: block;
      margin-bottom: 8px;
      font-size: 0.9rem;
    }

    .footer a:hover {
      color: var(--color-accent);
    }

    .footer-bottom {
      border-top: 1px solid #3A2A24;
      margin-top: 40px;
      padding: 20px 0;
      text-align: center;
      font-size: 0.85rem;
      color: #7A6A60;
    }

    /* 移动端 */
    @media (max-width: 1024px) {
      .hero {
        grid-template-columns: 1fr;
        min-height: auto;
      }
      .hero-visual {
        height: 45vh;
        min-height: 300px;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .advantages-row {
        grid-template-columns: 1fr;
      }
      .faq-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-right .btn-nav {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: var(--color-primary);
        padding: 32px;
        flex-direction: column;
        gap: 24px;
        z-index: 999;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: white;
        font-size: 1.2rem;
        font-weight: 500;
      }
      .solutions-grid {
        grid-template-columns: 1fr;
      }
      .data-wall {
        grid-template-columns: 1fr 1fr;
      }
      .case-card {
        flex: 0 0 260px;
      }
    }