/* roulang page: index */
:root {
      --deep-purple: #2D1B4E;
      --bronze-gold: #C8A96E;
      --ivory-white: #FBF7F0;
      --garnet-red: #9B1B30;
      --dark-bg: #1A0F2E;
      --warm-border: #E8E0D5;
      --text-dark: #3A3A3A;
      --text-muted: #6c6a7a;
      --card-shadow: 0 2px 12px rgba(45,27,78,0.08);
      --card-hover-shadow: 0 8px 28px rgba(45,27,78,0.18);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --transition-base: 0.25s ease;
      --sidebar-width: 72px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 300;
      line-height: 1.8;
      background-color: var(--ivory-white);
      color: var(--text-dark);
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-family: 'Noto Serif SC', serif;
      font-weight: 600;
      color: var(--deep-purple);
      letter-spacing: 0.02em;
    }
    a {
      text-decoration: none;
      transition: var(--transition-base);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      border-radius: var(--border-radius-btn);
      font-weight: 500;
      letter-spacing: 0.08em;
      padding: 14px 32px;
      font-size: 16px;
      transition: var(--transition-base);
    }
    .btn-primary-garnet {
      background-color: var(--garnet-red);
      border: 1px solid var(--garnet-red);
      color: white;
    }
    .btn-primary-garnet:hover, .btn-primary-garnet:focus {
      background-color: #7A1526;
      border-color: #7A1526;
      color: white;
    }
    .btn-outline-gold {
      background: transparent;
      border: 1px solid var(--bronze-gold);
      color: var(--bronze-gold);
    }
    .btn-outline-gold:hover, .btn-outline-gold:focus {
      background-color: rgba(200, 169, 110, 0.1);
      border-color: var(--bronze-gold);
      color: var(--bronze-gold);
    }
    /* 左侧导航 App Shell */
    .app-sidebar {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background-color: var(--deep-purple);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 24px 0;
      z-index: 1030;
      box-shadow: 2px 0 10px rgba(0,0,0,0.15);
    }
    .sidebar-logo {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 2px solid var(--bronze-gold);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bronze-gold);
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
      font-size: 20px;
      background-color: rgba(200,169,110,0.1);
    }
    .nav-icons {
      display: flex;
      flex-direction: column;
      gap: 28px;
      align-items: center;
    }
    .nav-icon-item {
      color: rgba(251,247,240,0.6);
      font-size: 1.5rem;
      transition: var(--transition-base);
      position: relative;
      cursor: pointer;
      text-decoration: none;
    }
    .nav-icon-item:hover, .nav-icon-item.active {
      color: var(--bronze-gold);
    }
    .nav-icon-item[data-tooltip]:hover::after {
      content: attr(data-tooltip);
      position: absolute;
      left: 48px;
      top: 50%;
      transform: translateY(-50%);
      background: var(--bronze-gold);
      color: white;
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 0.8rem;
      white-space: nowrap;
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 400;
    }
    .sidebar-bottom {
      color: rgba(251,247,240,0.5);
      font-size: 1.2rem;
    }
    .main-content {
      margin-left: var(--sidebar-width);
      transition: margin-left 0.3s;
    }
    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background-color: var(--deep-purple);
      z-index: 1040;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
    }
    .mobile-logo-text {
      color: var(--ivory-white);
      font-family: 'Noto Serif SC', serif;
      font-weight: 600;
      font-size: 1.2rem;
    }
    .offcanvas {
      background-color: var(--deep-purple);
      color: var(--ivory-white);
    }
    .offcanvas .nav-link {
      color: rgba(251,247,240,0.7);
      font-size: 1.1rem;
      padding: 12px 20px;
      border-bottom: 1px solid rgba(232,224,213,0.1);
    }
    .offcanvas .nav-link:hover, .offcanvas .nav-link.active {
      color: var(--bronze-gold);
      background: transparent;
    }
    .btn-close-white {
      filter: invert(1) grayscale(100%) brightness(200%);
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    .section-title {
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--deep-purple);
      margin-bottom: 12px;
    }
    .section-title .divider {
      width: 60px;
      height: 3px;
      background-color: var(--bronze-gold);
      margin: 16px auto 0;
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(90deg, rgba(45,27,78,0.85) 0%, rgba(45,27,78,0.3) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-title {
      font-size: 3.6rem;
      font-weight: 700;
      color: white;
      line-height: 1.3;
    }
    .hero-sub {
      font-size: 1.25rem;
      font-weight: 300;
      color: rgba(255,255,255,0.9);
      margin: 20px 0 32px;
    }
    /* 亮点卡片 */
    .feature-card {
      background: var(--ivory-white);
      border: 1px solid var(--warm-border);
      border-radius: var(--border-radius-card);
      padding: 32px 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      height: 100%;
      position: relative;
      overflow: hidden;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-top: 3px solid var(--bronze-gold);
    }
    .feature-icon {
      font-size: 2.8rem;
      color: var(--bronze-gold);
      margin-bottom: 20px;
    }
    .feature-number {
      font-family: 'Playfair Display', serif;
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--garnet-red);
      line-height: 1.2;
    }
    .feature-title {
      font-size: 1.4rem;
      font-weight: 600;
      margin: 12px 0 8px;
    }
    /* Masonry 案例 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      position: relative;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
    }
    .masonry-item:hover {
      box-shadow: var(--card-hover-shadow);
    }
    .masonry-img {
      width: 100%;
      display: block;
    }
    .masonry-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(45,27,78,0.8));
      padding: 40px 20px 20px;
      color: white;
    }
    .masonry-tag {
      background: var(--bronze-gold);
      color: #1A0F2E;
      font-size: 0.75rem;
      padding: 2px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    /* 方案对比表 */
    .plan-card {
      background: var(--ivory-white);
      border: 1px solid var(--warm-border);
      border-radius: var(--border-radius-card);
      padding: 36px 24px;
      text-align: center;
      box-shadow: var(--card-shadow);
      height: 100%;
      transition: var(--transition-base);
    }
    .plan-highlight {
      border: 1px solid var(--bronze-gold);
      background: #FFFDF7;
      position: relative;
    }
    .plan-badge {
      background: var(--garnet-red);
      color: white;
      font-size: 0.8rem;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .plan-price {
      font-family: 'Playfair Display', serif;
      font-size: 2.5rem;
      color: var(--deep-purple);
      margin: 20px 0;
    }
    /* FAQ */
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--warm-border);
      background: transparent;
    }
    .accordion-button {
      font-family: 'Noto Serif SC', serif;
      font-weight: 600;
      font-size: 1.2rem;
      color: var(--deep-purple);
      background: transparent;
      box-shadow: none;
      padding: 20px 0;
    }
    .accordion-button:not(.collapsed) {
      color: var(--bronze-gold);
      background: transparent;
      box-shadow: none;
    }
    .accordion-button::after {
      display: none;
    }
    .accordion-button .faq-indicator {
      width: 3px;
      height: 24px;
      background-color: var(--deep-purple);
      margin-right: 16px;
      transition: var(--transition-base);
    }
    .accordion-button:not(.collapsed) .faq-indicator {
      background-color: var(--garnet-red);
      height: 32px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background-color: var(--dark-bg);
      background-image: radial-gradient(circle at 20% 30%, rgba(200,169,110,0.08) 0%, transparent 40%);
      padding: 80px 0;
    }
    /* 页脚 */
    .footer {
      background-color: var(--deep-purple);
      color: rgba(251,247,240,0.7);
      padding: 60px 0 30px;
    }
    .footer a {
      color: rgba(251,247,240,0.7);
    }
    .footer a:hover {
      color: var(--bronze-gold);
    }
    .footer-logo {
      font-family: 'Noto Serif SC', serif;
      font-size: 1.8rem;
      color: white;
      font-weight: 600;
    }
    @media (max-width: 991.98px) {
      .app-sidebar {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        padding-top: 56px;
      }
      .hero-title {
        font-size: 2.4rem;
      }
      section {
        padding: 60px 0;
      }
      .masonry-grid {
        column-count: 2;
      }
    }
    @media (max-width: 767.98px) {
      .hero-title {
        font-size: 2rem;
      }
      .masonry-grid {
        column-count: 1;
      }
      .section-title h2 {
        font-size: 2rem;
      }
    }