/* roulang page: index */
:root {
      --color-ink: #2D1B3D;
      --color-jade: #3A8B7D;
      --color-amber: #D49B3F;
      --color-amber-hover: #B8832E;
      --bg-warm: #FAF7F2;
      --bg-dark: #1A1028;
      --card-bg: #FFFFFF;
      --text-primary: #3D3A38;
      --text-muted: #7A7672;
      --text-light: #F5F0E8;
      --border-subtle: #E8E3DA;
      --shadow-card: 0 2px 16px rgba(45,27,61,0.06);
      --shadow-dark: 0 4px 24px rgba(0,0,0,0.25);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-serif: "Noto Serif SC", "PingFang SC", "Microsoft YaHei", serif;
      --font-sans: "PingFang SC", "Inter", "Helvetica Neue", system-ui, sans-serif;
      --font-number: "Inter", "PingFang SC", sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      outline: none;
      border-radius: var(--radius-btn);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航系统 */
    .site-header {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 90;
      border-bottom: 1px solid var(--border-subtle);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .nav-brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--color-ink);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-amber);
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 20px;
      position: relative;
    }

    .logo-icon::after {
      content: "";
      position: absolute;
      width: 28px;
      height: 28px;
      border: 1.5px solid var(--color-jade);
      border-radius: 50%;
      opacity: 0.7;
    }

    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 24px;
      color: var(--color-ink);
      letter-spacing: 2px;
    }

    .brand-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      color: var(--text-muted);
      font-size: 20px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .btn-register-sm {
      background: var(--color-amber);
      color: white;
      padding: 8px 20px;
      font-size: 14px;
      border-radius: 20px;
      font-weight: 600;
    }

    .btn-register-sm:hover {
      background: var(--color-amber-hover);
    }

    .nav-tabs-row {
      border-top: 1px solid var(--border-subtle);
      padding: 0;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
      display: flex;
      align-items: center;
    }

    .nav-tabs-row::-webkit-scrollbar {
      display: none;
    }

    .nav-tab {
      display: inline-block;
      padding: 14px 20px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      border-bottom: 3px solid transparent;
      transition: var(--transition);
      background: transparent;
      font-family: var(--font-sans);
      letter-spacing: 0.5px;
    }

    .nav-tab:hover {
      color: var(--color-ink);
    }

    .nav-tab.active {
      color: var(--color-ink);
      border-bottom-color: var(--color-jade);
      font-weight: 600;
    }

    /* 汉堡菜单 (移动端) */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--color-ink);
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-tabs-row {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        box-shadow: var(--shadow-dark);
        border-top: 1px solid var(--border-subtle);
      }
      .nav-tabs-row.open {
        display: flex;
      }
      .nav-tab {
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-subtle);
      }
      .brand-actions .search-icon {
        display: none;
      }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
    }

    .section-title {
      font-family: var(--font-serif);
      font-size: 32px;
      font-weight: 700;
      color: var(--color-ink);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
      font-size: 16px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--color-amber);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(212,155,63,0.3);
    }
    .btn-primary:hover {
      background: var(--color-amber-hover);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(184,131,46,0.35);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--color-ink);
      color: var(--color-ink);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }
    .btn-secondary:hover {
      background: var(--color-ink);
      color: white;
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--text-light);
      color: var(--text-light);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
    }
    .btn-ghost:hover {
      background: rgba(245,240,232,0.15);
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 6fr 4fr;
      gap: 48px;
      align-items: center;
      background: var(--bg-warm);
      position: relative;
      overflow: hidden;
    }

    .hero-left h1 {
      font-family: var(--font-serif);
      font-size: 48px;
      font-weight: 700;
      color: var(--color-ink);
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .hero-left .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }

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

    .hero-right img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(45,27,61,0.12);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 38px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-subtle);
      transition: var(--transition);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(45,27,61,0.1);
    }

    .card-icon {
      font-size: 40px;
      color: var(--color-jade);
      margin-bottom: 20px;
    }

    .card h3 {
      font-family: var(--font-serif);
      font-size: 20px;
      color: var(--color-ink);
      margin-bottom: 10px;
    }

    .card p {
      color: var(--text-muted);
      font-size: 14px;
      margin-bottom: 20px;
    }

    .card-link {
      color: var(--color-jade);
      font-weight: 600;
      font-size: 15px;
    }
    .card-link:hover {
      text-decoration: underline;
    }

    @media (max-width: 1024px) {
      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .card-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 18px 32px rgba(0,0,0,0.2);
    }
    .scene-text {
      flex: 1;
    }
    .scene-text h2 {
      font-family: var(--font-serif);
      font-size: 28px;
      color: var(--color-ink);
    }
    .big-number {
      font-family: var(--font-number);
      font-size: 42px;
      font-weight: 700;
      color: var(--color-amber);
    }
    @media (max-width: 768px) {
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
    }

    /* 价格卡片 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      flex: 1;
      min-width: 260px;
      border: 1px solid var(--border-subtle);
      text-align: center;
    }
    .price-card.featured {
      border: 2px solid var(--color-jade);
      box-shadow: 0 8px 30px rgba(58,139,125,0.15);
      transform: scale(1.02);
    }
    .price-amount {
      font-family: var(--font-number);
      font-size: 36px;
      color: var(--color-ink);
      font-weight: 700;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: var(--color-ink);
      cursor: pointer;
    }
    .faq-answer {
      color: var(--text-muted);
      font-size: 14px;
      margin-top: 8px;
      display: none;
      background: #F9F7F4;
      padding: 12px;
      border-radius: 8px;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    footer {
      background: linear-gradient(180deg, #2D1B3D 0%, #1A1028 100%);
      color: var(--text-light);
      padding: 60px 0 24px;
    }