/* roulang page: index */
:root {
      --primary: #FF5A1F;
      --primary-dark: #DE3C02;
      --secondary: #0F172A;
      --accent-green: #10B981;
      --bg-main: #F8FAFC;
      --bg-card: #FFFFFF;
      --border-color: #E2E8F0;
      --text-heading: #0F172A;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 50rem;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-lg: 0 16px 36px -4px rgba(15, 23, 42, 0.12);
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-body);
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-heading);
      line-height: 1.3;
      font-weight: 700;
    }

    a {
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .btn-brand {
      background-color: var(--primary);
      color: #FFFFFF !important;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      border: 1px solid var(--primary);
      box-shadow: 0 4px 14px rgba(255, 90, 31, 0.25);
    }
    .btn-brand:hover {
      background-color: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 90, 31, 0.35);
    }

    .btn-outline-custom {
      border: 1.5px solid var(--border-color);
      color: var(--text-heading);
      background: #FFFFFF;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      font-weight: 600;
    }
    .btn-outline-custom:hover {
      border-color: var(--secondary);
      background-color: var(--secondary);
      color: #FFFFFF;
    }

    /* 顶部双行导航 */
    .top-micro-bar {
      background: var(--secondary);
      color: #94A3B8;
      font-size: 0.8rem;
      padding: 0.45rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-micro-bar .status-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-green);
      border-radius: 50%;
      display: inline-block;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--accent-green);
    }

    .main-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .brand-logo-text {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-heading);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .brand-logo-text i {
      color: var(--primary);
      font-size: 1.6rem;
    }

    /* Section 公共修饰 */
    section {
      padding: 5rem 0;
      position: relative;
    }
    .section-alt {
      background-color: #FFFFFF;
    }
    .section-title-wrap {
      margin-bottom: 3.5rem;
    }
    .section-subtag {
      font-size: 0.825rem;
      text-transform: uppercase;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1.5px;
      margin-bottom: 0.5rem;
      display: block;
    }
    .section-title {
      font-size: 2.15rem;
      margin-bottom: 1rem;
    }
    .section-divider {
      width: 44px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-body);
      max-width: 760px;
      margin: 0.75rem auto 0 auto;
    }

    /* 卡片与交互 */
    .app-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      height: 100%;
      position: relative;
    }
    .app-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
      border-color: rgba(255, 90, 31, 0.3);
    }
    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(255, 90, 31, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 1.25rem;
    }

    /* Hero 对比选型特别样式 */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(255, 90, 31, 0.04) 0%, rgba(248, 250, 252, 1) 90%), url('/assets/images/a117b509554db747.jpg') center/cover no-repeat;
      position: relative;
      padding: 5.5rem 0 4.5rem 0;
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(255, 255, 255, 0.94) 10%, rgba(248, 250, 252, 0.88) 100%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .plan-hero-card {
      background: #FFFFFF;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 2.2rem;
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: transform 0.25s ease;
    }
    .plan-hero-card.featured {
      border-color: var(--primary);
      box-shadow: 0 12px 32px rgba(255, 90, 31, 0.18);
      transform: scale(1.02);
    }
    .plan-badge {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--primary);
      color: #FFFFFF;
      font-size: 0.75rem;
      padding: 4px 14px;
      border-radius: var(--radius-badge);
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    /* 深色视差数据中枢 */
    .dark-concept-section {
      background: #0B1120 url('/assets/images/e8e38120de0580c5.webp') center/cover no-repeat;
      color: #F8FAFC;
      position: relative;
    }
    .dark-concept-section::before {
      content: "";
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: rgba(11, 17, 32, 0.92);
      z-index: 1;
    }
    .dark-concept-section .container {
      position: relative;
      z-index: 2;
    }
    .dark-concept-section h2, .dark-concept-section h3 {
      color: #FFFFFF;
    }

    /* 前后对比 */
    .compare-box {
      border-radius: var(--radius-card);
      padding: 2rem;
      height: 100%;
    }
    .compare-traditional {
      background: #F1F5F9;
      border: 1px dashed var(--border-color);
    }
    .compare-platform {
      background: #FFF7ED;
      border: 1px solid rgba(255, 90, 31, 0.35);
    }

    /* FAQ 手风琴重构 */
    .accordion-button:not(.collapsed) {
      color: var(--primary-dark);
      background-color: rgba(255, 90, 31, 0.06);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--border-color);
    }
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: 12px !important;
      margin-bottom: 1rem;
      overflow: hidden;
    }

    /* 页脚 */
    footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 4.5rem 0 2rem 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    footer h4 {
      color: #FFFFFF;
      font-size: 1.1rem;
      margin-bottom: 1.25rem;
    }
    footer a {
      color: #94A3B8;
    }
    footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 991.98px) {
      .plan-hero-card.featured {
        transform: none;
        margin-top: 1.5rem;
      }
      .section-title {
        font-size: 1.85rem;
      }
    }