/* roulang page: index */
:root {
      --deep-slate: #2B3A42;
      --sand-gold: #C49A2B;
      --warm-bg: #FAF9F6;
      --dark-bg: #1E2B32;
      --text-primary: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-muted: #6B6B6B;
      --text-light: #B0B8BD;
      --accent-gold: #B8860B;
      --border-light: #E8E4DD;
      --card-shadow: 0 2px 16px rgba(43, 58, 66, 0.06);
      --card-shadow-hover: 0 8px 28px rgba(43, 58, 66, 0.12);
      --border-radius-sm: 6px;
      --border-radius-md: 8px;
      --border-radius-lg: 12px;
      --transition-smooth: 0.25s ease;
      --transition-card: 0.3s ease;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', sans-serif;
      --section-gap: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-primary);
      line-height: 1.6;
      margin: 0;
      padding-top: 70px;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      color: var(--deep-slate);
    }

    .section-title h2 {
      font-size: 2.25rem;
      margin-bottom: 0.75rem;
      letter-spacing: 0.5px;
    }
    .section-title .divider {
      width: 48px;
      height: 3px;
      background-color: var(--sand-gold);
      margin: 0.5rem 0 1.5rem;
    }

    /* 导航栏 */
    .navbar-custom {
      background-color: #ffffff;
      border-bottom: 1px solid var(--border-light);
      padding: 0.8rem 0;
      transition: var(--transition-smooth);
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1020;
      backdrop-filter: blur(4px);
      background-color: rgba(255,255,255,0.95);
    }
    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 20px;
      color: var(--deep-slate) !important;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .navbar-brand .diamond-icon {
      display: inline-block;
      width: 10px;
      height: 10px;
      background-color: var(--sand-gold);
      transform: rotate(45deg);
      margin-left: 4px;
    }
    .navbar-nav .nav-link {
      font-family: var(--font-sans);
      font-weight: 400;
      font-size: 15px;
      color: var(--text-secondary) !important;
      margin: 0 18px;
      padding: 0.5rem 0 !important;
      position: relative;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }
    .navbar-nav .nav-link:hover {
      color: var(--sand-gold) !important;
    }
    .navbar-nav .nav-link.active {
      color: var(--deep-slate) !important;
      font-weight: 500;
    }
    .navbar-nav .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--sand-gold);
    }
    .btn-outline-gold {
      border: 1.5px solid var(--sand-gold);
      color: var(--sand-gold);
      background: transparent;
      padding: 8px 24px;
      border-radius: 50px;
      font-weight: 500;
      transition: var(--transition-smooth);
      white-space: nowrap;
    }
    .btn-outline-gold:hover {
      background-color: var(--sand-gold);
      color: white;
    }
    .navbar-toggler {
      border: none;
      padding: 4px 8px;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }

    /* Hero */
    .hero-section {
      background-color: var(--warm-bg);
      padding: 3rem 0 5rem;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      color: var(--deep-slate);
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-muted);
      max-width: 480px;
      margin-bottom: 2rem;
      font-weight: 300;
    }
    .hero-stats {
      display: flex;
      gap: 2.5rem;
      margin: 2rem 0 2.5rem;
      flex-wrap: wrap;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 2.25rem;
      color: var(--sand-gold);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .btn-primary-slate {
      background-color: var(--deep-slate);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--border-radius-sm);
      font-weight: 500;
      transition: var(--transition-smooth);
    }
    .btn-primary-slate:hover {
      background-color: #1f2a30;
    }
    .btn-link-gold {
      color: var(--deep-slate);
      text-decoration: underline;
      text-underline-offset: 4px;
      font-weight: 500;
      margin-left: 20px;
      transition: color 0.2s;
    }
    .btn-link-gold:hover {
      color: var(--sand-gold);
    }
    .hero-image-wrapper {
      position: relative;
      border-radius: var(--border-radius-lg);
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    }
    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      display: block;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(43,58,66,0.08);
    }

    /* 服务卡片 */
    .service-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-md);
      padding: 32px 24px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-card);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--deep-slate);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--sand-gold);
      font-size: 2.2rem;
    }
    .service-card h3 {
      font-size: 1.375rem;
      margin-bottom: 0.8rem;
    }
    .service-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      flex: 1;
    }
    .service-link {
      margin-top: 1.5rem;
      font-weight: 500;
      color: var(--deep-slate);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.2s;
    }
    .service-link i {
      font-size: 0.8rem;
    }
    .service-link:hover {
      gap: 12px;
      color: var(--sand-gold);
    }

    /* 场景图文 */
    .scene-block {
      margin-bottom: 4rem;
    }
    .scene-img {
      border-radius: 10px;
      border: 1px solid var(--border-light);
      width: 100%;
      aspect-ratio: 16 / 10;
      object-fit: cover;
      background-color: #eae7e1;
    }
    .scene-number {
      font-family: var(--font-serif);
      font-size: 7rem;
      font-weight: 700;
      color: #E8E4DD;
      position: absolute;
      top: -30px;
      left: -10px;
      line-height: 1;
      z-index: 0;
    }
    .scene-text {
      position: relative;
      z-index: 1;
      padding-left: 1rem;
    }
    .scene-text h3 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }
    .scene-list {
      list-style: none;
      padding-left: 0;
    }
    .scene-list li::before {
      content: "◆";
      color: var(--sand-gold);
      font-size: 0.7rem;
      margin-right: 0.6rem;
    }

    /* 案例卡片 */
    .case-scroll-container {
      overflow-x: auto;
      padding-bottom: 1rem;
      display: flex;
      gap: 24px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      max-width: 320px;
      background: white;
      border-radius: var(--border-radius-md);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      flex-shrink: 0;
    }
    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px 8px 0 0;
    }
    .case-body {
      padding: 1.2rem;
    }
    .case-highlight {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 2rem;
      color: var(--sand-gold);
    }

    /* FAQ */
    .accordion-faq .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-faq .accordion-button {
      font-weight: 500;
      font-size: 1.05rem;
      color: var(--deep-slate);
      background: #FAF9F6;
      box-shadow: none;
      padding: 1.2rem 1rem;
    }
    .accordion-faq .accordion-button:not(.collapsed) {
      background: white;
      color: var(--deep-slate);
    }
    .accordion-faq .accordion-body {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.7;
    }

    .cta-banner {
      background-color: var(--dark-bg);
      padding: 4rem 0;
    }
    .footer-custom {
      background-color: #2B3A42;
      color: #B0B8BD;
    }
    .footer-custom a {
      color: #B0B8BD;
      text-decoration: none;
    }
    .footer-custom a:hover {
      color: var(--sand-gold);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
      }
      .scene-number {
        font-size: 4rem;
        top: -15px;
      }
    }