/* roulang page: index */
:root {
      --sand-gold: #C8A96E;
      --sand-gold-dark: #B8944F;
      --indigo-deep: #1A1F3D;
      --obsidian-black: #0F1117;
      --ivory-white: #FAF8F5;
      --lapis-blue: #3B5BA5;
      --text-primary: #1A1F3D;
      --text-secondary: #5A5E6B;
      --text-muted: #8C8F98;
      --border-light: rgba(26, 31, 61, 0.05);
      --border-medium: rgba(26, 31, 61, 0.1);
      --shadow-sm: 0 2px 12px rgba(26, 31, 61, 0.06);
      --shadow-md: 0 8px 28px rgba(26, 31, 61, 0.12);
      --border-radius-card: 8px;
      --border-radius-btn: 6px;
      --border-radius-tag: 4px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', '宋体', serif;
      --font-sans: 'Noto Sans SC', 'Inter', 'Helvetica Neue', '黑体', sans-serif;
      --transition-base: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--ivory-white);
      color: var(--text-primary);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      scroll-behavior: smooth;
    }

    h1, h2, h3, .font-serif {
      font-family: var(--font-serif);
      font-weight: 700;
    }

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

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

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 48px;
      z-index: 1000;
      transition: background-color 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      background-color: transparent;
      backdrop-filter: blur(0px);
    }

    .navbar-custom.scrolled {
      background-color: rgba(250, 248, 245, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(26, 31, 61, 0.06);
    }

    .brand-logo {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      color: var(--sand-gold);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand-logo i {
      font-size: 1.8rem;
      color: var(--sand-gold);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: var(--indigo-deep);
      font-size: 0.95rem;
      font-weight: 500;
      transition: color var(--transition-base);
      letter-spacing: 0.02em;
    }

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

    .nav-cta {
      background-color: var(--sand-gold);
      color: var(--obsidian-black);
      border: none;
      border-radius: var(--border-radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.95rem;
      transition: background-color var(--transition-base), transform 0.2s;
      margin-left: 24px;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background-color: var(--sand-gold-dark);
      transform: translateY(-2px);
      color: var(--obsidian-black);
    }

    .navbar-toggler {
      border: none;
      color: var(--indigo-deep);
      font-size: 1.5rem;
    }

    .navbar-toggler:focus {
      box-shadow: none;
    }

    @media (max-width: 768px) {
      .navbar-custom {
        padding: 0 24px;
      }
      .nav-links {
        background-color: rgba(250, 248, 245, 0.98);
        backdrop-filter: blur(16px);
        border-radius: 12px;
        padding: 16px;
        margin-top: 12px;
        box-shadow: var(--shadow-md);
      }
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--sand-gold);
      color: var(--obsidian-black);
      border: none;
      border-radius: var(--border-radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 1rem;
      transition: background-color var(--transition-base), transform 0.2s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
      line-height: 1.2;
    }

    .btn-primary-custom:hover {
      background-color: var(--sand-gold-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(200, 169, 110, 0.25);
      color: var(--obsidian-black);
    }

    .btn-outline-custom {
      background: transparent;
      color: var(--indigo-deep);
      border: 1.5px solid var(--indigo-deep);
      border-radius: var(--border-radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition-base);
      display: inline-block;
      text-align: center;
    }

    .btn-outline-custom:hover {
      background-color: var(--indigo-deep);
      color: white;
    }

    .btn-lg-custom {
      padding: 18px 48px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background-color: var(--ivory-white);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--indigo-deep);
      margin-bottom: 1.5rem;
    }

    .hero-subtitle {
      font-size: 1.1rem;
      color: #5A5E6B;
      margin-bottom: 2rem;
      max-width: 90%;
    }

    .hero-image {
      border-radius: 12px;
      box-shadow: var(--shadow-md);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 板块通用 */
    .section-padding {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--indigo-deep);
      margin-bottom: 0.5rem;
      text-align: center;
    }

    .divider {
      width: 60px;
      height: 2px;
      background-color: var(--sand-gold);
      margin: 0 auto 48px;
    }

    /* 亮点网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-template-rows: auto auto auto;
      gap: 24px;
    }

    .adv-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      transition: box-shadow 0.35s, transform 0.2s;
      border-left: 4px solid var(--sand-gold);
    }

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

    .adv-icon {
      font-size: 2rem;
      color: var(--lapis-blue);
      margin-bottom: 16px;
    }

    .adv-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--indigo-deep);
    }

    .adv-desc {
      color: var(--text-secondary);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .adv-feature-block {
      grid-row: span 2;
      background: url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
      border-radius: var(--border-radius-card);
      position: relative;
      display: flex;
      align-items: flex-end;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .adv-feature-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(15,17,23,0.7) 0%, rgba(26,31,61,0.2) 100%);
      border-radius: var(--border-radius-card);
    }

    .adv-feature-text {
      position: relative;
      z-index: 2;
      color: white;
      font-size: 1.8rem;
      font-weight: 700;
      font-family: var(--font-serif);
    }

    /* 服务展示 */
    .services-container {
      display: grid;
      grid-template-columns: 280px 1fr;
      gap: 40px;
    }

    .service-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .service-item {
      padding: 16px 20px;
      background: transparent;
      border-radius: var(--border-radius-card);
      font-weight: 500;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s;
      border-left: 3px solid transparent;
    }

    .service-item.active {
      background: rgba(200, 169, 110, 0.08);
      border-left: 3px solid var(--sand-gold);
      color: var(--indigo-deep);
      font-weight: 600;
    }

    .service-detail {
      display: none;
      animation: fadeIn 0.3s ease;
    }

    .service-detail.active {
      display: block;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .service-detail-img {
      border-radius: 12px;
      margin: 16px 0;
      width: 100%;
      max-height: 240px;
      object-fit: cover;
    }

    /* 案例瀑布 */
    .cases-grid {
      columns: 2;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.35s;
      border: 1px solid var(--border-light);
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
    }

    .case-img-wrap {
      position: relative;
      overflow: hidden;
    }

    .case-img-wrap img {
      transition: transform 0.35s;
      width: 100%;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }

    .case-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(26,31,61,0.7) 0%, transparent 60%);
      opacity: 0;
      display: flex;
      align-items: flex-end;
      justify-content: center;
      padding: 24px;
      transition: opacity 0.35s;
      color: white;
      font-weight: 600;
    }

    .case-card:hover .case-overlay {
      opacity: 1;
    }

    .case-info {
      padding: 20px;
    }

    .tag {
      background: transparent;
      border: 1px solid var(--sand-gold);
      color: var(--sand-gold);
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 0.75rem;
      display: inline-block;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-medium);
      padding: 20px 0;
      display: flex;
      align-items: flex-start;
      gap: 20px;
    }

    .faq-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--sand-gold);
      width: 50px;
      flex-shrink: 0;
    }

    .faq-content {
      flex: 1;
    }

    .faq-question {
      font-weight: 700;
      color: var(--indigo-deep);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA 深色带 */
    .cta-dark {
      background-color: var(--obsidian-black);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .footer-custom {
      background-color: var(--indigo-deep);
      color: #D0D3DC;
      padding: 60px 0 20px;
    }

    @media (max-width: 768px) {
      .hero-grid { grid-template-columns: 1fr; }
      .advantages-grid { grid-template-columns: 1fr; }
      .services-container { grid-template-columns: 1fr; }
      .cases-grid { columns: 1; }
      .hero-title { font-size: 2.5rem; }
    }