/* roulang page: index */
:root {
      --bs-primary: #FF5500;
      --bs-primary-rgb: 255, 85, 0;
      --bs-secondary: #0F382C;
      --bs-secondary-rgb: 15, 56, 44;
      --app-accent-lime: #70C040;
      --app-dark-slate: #1E232A;
      --app-sub-text: #5A6578;
      --app-bg-warm: #F8F9FA;
      --app-border-light: rgba(15, 56, 44, 0.08);
      --app-shadow-soft: 0 10px 30px rgba(15, 56, 44, 0.07);
      --app-shadow-hover: 0 16px 36px rgba(255, 85, 0, 0.15);
      --app-radius-card: 16px;
      --app-radius-btn: 50rem;
    }

    * { box-sizing: border-box; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--app-dark-slate);
      background-color: #FFFFFF;
      line-height: 1.65;
      overflow-x: hidden;
      margin: 0;
      padding: 0;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--app-secondary);
    }
    p { margin-bottom: 0.85rem; }
    a { text-decoration: none; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; }

    /* 全局组件定制 */
    .btn-primary {
      background-color: var(--bs-primary);
      border-color: var(--bs-primary);
      border-radius: var(--app-radius-btn);
      padding: 0.68rem 1.85rem;
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(255, 85, 0, 0.3);
      transition: all 0.25s ease-in-out;
    }
    .btn-primary:hover, .btn-primary:focus {
      background-color: #E04800;
      border-color: #E04800;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 85, 0, 0.4);
    }
    .btn-outline-secondary {
      color: var(--bs-secondary);
      border-color: var(--bs-secondary);
      border-radius: var(--app-radius-btn);
      padding: 0.68rem 1.85rem;
      font-weight: 600;
    }
    .btn-outline-secondary:hover {
      background-color: var(--bs-secondary);
      color: #FFFFFF;
      transform: translateY(-2px);
    }
    .badge-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 50rem;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .badge-chip-live {
      background: rgba(255, 85, 0, 0.12);
      color: var(--bs-primary);
      border: 1px solid rgba(255, 85, 0, 0.25);
    }
    .badge-chip-warmup {
      background: rgba(112, 192, 64, 0.15);
      color: #3B7517;
      border: 1px solid rgba(112, 192, 64, 0.3);
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--bs-primary);
      display: inline-block;
      animation: pulseAnimation 1.6s infinite;
    }
    @keyframes pulseAnimation {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 85, 0, 0.7); }
      70% { transform: scale(1.15); box-shadow: 0 0 0 8px rgba(255, 85, 0, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 85, 0, 0); }
    }

    /* 顶部活动双行导航 */
    .top-meta-bar {
      background-color: #0B2920;
      color: rgba(255,255,255,0.85);
      font-size: 0.82rem;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .main-navbar {
      background: #FFFFFF;
      box-shadow: 0 4px 20px rgba(15, 56, 44, 0.06);
      position: sticky;
      top: 0;
      z-index: 1020;
      padding: 0.85rem 0;
    }
    .navbar-brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--bs-secondary);
      display: flex;
      align-items: center;
      gap: 9px;
    }
    .navbar-brand-logo .brand-icon {
      width: 36px;
      height: 36px;
      background: var(--bs-primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      font-size: 1.15rem;
    }
    .nav-link {
      font-weight: 600;
      color: var(--app-dark-slate);
      padding: 0.5rem 0.95rem !important;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--bs-primary);
    }

    /* 板块共有修饰 */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 52px;
      text-align: center;
    }
    .section-subtitle-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--bs-primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 10px;
      background: rgba(255, 85, 0, 0.08);
      padding: 4px 14px;
      border-radius: 20px;
    }
    .section-desc-lead {
      color: var(--app-sub-text);
      max-width: 680px;
      margin: 12px auto 0 auto;
      font-size: 0.98rem;
    }

    /* 卡片通用美化 */
    .app-card {
      background: #FFFFFF;
      border-radius: var(--app-radius-card);
      border: 1px solid var(--app-border-light);
      box-shadow: var(--app-shadow-soft);
      padding: 30px;
      transition: all 0.3s ease;
      height: 100%;
      position: relative;
    }
    .app-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--app-shadow-hover);
      border-color: rgba(255, 85, 0, 0.2);
    }

    /* Hero */
    .hero-landing {
      background: linear-gradient(135deg, rgba(15, 56, 44, 0.92) 0%, rgba(11, 41, 32, 0.96) 100%), url('/assets/images/795f7cbe7a4998bd.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 95px 0 85px 0;
      position: relative;
    }
    .hero-badge-pill {
      background: rgba(255, 85, 0, 0.25);
      border: 1px solid var(--bs-primary);
      color: #FFB38A;
      font-weight: 600;
      border-radius: 50rem;
      padding: 6px 16px;
      display: inline-block;
      margin-bottom: 20px;
      font-size: 0.88rem;
    }
    .hero-title {
      font-size: 2.85rem;
      line-height: 1.25;
      color: #FFFFFF;
      font-weight: 800;
      margin-bottom: 22px;
    }
    .hero-lead-text {
      color: rgba(255, 255, 255, 0.85);
      font-size: 1.08rem;
      line-height: 1.75;
      margin-bottom: 34px;
    }
    .hero-fast-bar {
      background: #FFFFFF;
      border-radius: 18px;
      padding: 24px;
      box-shadow: 0 15px 35px rgba(0,0,0,0.18);
      margin-top: 40px;
    }

    /* 闪购/测评活动横条 */
    .flash-event-bar {
      background: #FFF1EA;
      border: 1px solid #FFD4C2;
      border-radius: 14px;
      padding: 16px 24px;
    }

    /* 优势网格 */
    .adv-icon-badge {
      width: 54px;
      height: 54px;
      border-radius: 14px;
      background: rgba(255, 85, 0, 0.1);
      color: var(--bs-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.45rem;
      margin-bottom: 18px;
    }

    /* 课程卡片 */
    .course-card-thumb {
      height: 190px;
      width: 100%;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 18px;
    }

    /* 深色哲学板块 */
    .philosophy-section {
      background-color: var(--bs-secondary);
      color: #FFFFFF;
    }
    .philosophy-section h2, .philosophy-section h3 {
      color: #FFFFFF;
    }
    .timeline-node {
      border-left: 2px dashed rgba(255, 255, 255, 0.25);
      padding-left: 28px;
      position: relative;
      margin-bottom: 35px;
    }
    .timeline-node::before {
      content: '';
      position: absolute;
      left: -9px;
      top: 4px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--bs-primary);
      border: 3px solid #0F382C;
    }

    /* 关键指标看板条 */
    .metrics-bar-section {
      background: linear-gradient(90deg, #FF5500 0%, #FF6E26 100%);
      color: #FFFFFF;
      padding: 55px 0;
    }
    .metric-value-num {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1;
      margin-bottom: 8px;
      font-family: Arial, sans-serif;
    }

    /* FAQ 手风琴重构 */
    .accordion-button:not(.collapsed) {
      color: var(--bs-primary);
      background-color: rgba(255, 85, 0, 0.05);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--bs-primary);
      box-shadow: none;
    }
    .accordion-item {
      border-radius: 12px !important;
      border: 1px solid var(--app-border-light);
      margin-bottom: 14px;
      overflow: hidden;
    }

    /* 底部固定转化条 */
    .sticky-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #FFFFFF;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
      z-index: 1000;
      padding: 12px 0;
      border-top: 1px solid rgba(15, 56, 44, 0.1);
    }

    /* 页脚 */
    .site-footer {
      background: #092019;
      color: #A6B4AF;
      padding: 70px 0 110px 0; /* 留出底部悬浮高度 */
      font-size: 0.92rem;
    }
    .site-footer a { color: #CBD8D4; }
    .site-footer a:hover { color: var(--bs-primary); }

    @media (max-width: 991px) {
      .hero-title { font-size: 2.15rem; }
      .section-wrap { padding: 60px 0; }
    }