/* roulang page: index */
:root {
      --primary: #F0540C;
      --primary-gradient: linear-gradient(135deg, #F0540C 0%, #FF7A30 50%, #FFB347 100%);
      --primary-light: rgba(240, 84, 12, 0.1);
      --secondary: #C0C5CE;
      --dark-bg: #1A1D22;
      --light-bg: #F7F8FA;
      --card-bg: #FFFFFF;
      --dark-card-bg: rgba(255,255,255,0.04);
      --text-dark: #1A1D22;
      --text-light: #E8EAED;
      --text-muted: #7A7E85;
      --border-light: #E8EAED;
      --success: #00C897;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.08);
      --shadow-hover: 0 16px 48px rgba(240,84,12,0.15);
      --shadow-nav: 0 4px 24px rgba(0,0,0,0.06);
      --radius-xl: 20px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-round: 50px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-dark);
      background-color: var(--light-bg);
      overflow-x: hidden;
    }

    .font-number {
      font-family: "Inter", "SF Pro Display", system-ui, sans-serif;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
    }

    h2 {
      font-size: 34px;
      line-height: 1.3;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }

    .text-small {
      font-size: 13px;
      line-height: 1.5;
      font-weight: 500;
      letter-spacing: 0.04em;
    }

    /* 导航玻璃效果 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      transition: var(--transition);
      padding: 12px 0;
    }

    .navbar-glass {
      background: rgba(26, 29, 34, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      box-shadow: var(--shadow-nav);
    }

    .navbar-solid {
      background: var(--dark-bg);
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .navbar-brand {
      font-size: 20px;
      font-weight: 700;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .navbar-brand i {
      font-size: 20px;
      background: none;
      -webkit-text-fill-color: var(--primary);
      color: var(--primary);
    }

    .nav-link-custom {
      color: rgba(255,255,255,0.8) !important;
      font-weight: 500;
      margin: 0 6px;
      transition: var(--transition);
      position: relative;
      font-size: 15px;
      padding: 8px 12px !important;
    }

    .nav-link-custom:hover {
      color: #fff !important;
    }

    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 12px;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

    .nav-link-custom:hover::after {
      width: calc(100% - 24px);
    }

    .btn-nav {
      background: var(--primary-gradient);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 8px 20px;
      border-radius: var(--radius-round);
      font-size: 14px;
      transition: var(--transition);
      box-shadow: 0 4px 16px rgba(240,84,12,0.3);
      white-space: nowrap;
    }

    .btn-nav:hover {
      background: linear-gradient(135deg, #FF7A30 0%, #F0540C 100%);
      box-shadow: 0 8px 24px rgba(240,84,12,0.45);
      transform: scale(1.03);
      color: #fff;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background: var(--primary-gradient);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-round);
      transition: var(--transition);
      box-shadow: 0 4px 16px rgba(240,84,12,0.3);
      font-size: 16px;
      display: inline-block;
      text-decoration: none;
    }

    .btn-primary-custom:hover {
      background: linear-gradient(135deg, #FF7A30 0%, #F0540C 100%);
      box-shadow: 0 8px 24px rgba(240,84,12,0.45);
      transform: scale(1.03);
      color: #fff;
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-round);
      transition: var(--transition);
      font-size: 16px;
      display: inline-block;
      text-decoration: none;
    }

    .btn-outline-custom:hover {
      background: var(--primary-light);
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-light-custom {
      background: #fff;
      color: var(--dark-bg);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-round);
      border: none;
      transition: var(--transition);
    }

    .btn-light-custom:hover {
      background: #f0f0f0;
      transform: scale(1.02);
    }

    /* 卡片样式 */
    .card-custom {
      border-radius: var(--radius-xl);
      background: var(--card-bg);
      box-shadow: var(--shadow-card);
      border: none;
      transition: var(--transition);
    }

    .card-dark {
      background: var(--dark-card-bg);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.06);
      color: var(--text-light);
    }

    .card-dark:hover {
      border-color: rgba(240,84,12,0.5);
      box-shadow: var(--shadow-hover);
    }

    .badge-data {
      background: rgba(240,84,12,0.1);
      color: var(--primary);
      border-radius: var(--radius-lg);
      padding: 12px 20px;
      font-weight: 800;
      font-size: 40px;
      line-height: 1;
      display: inline-flex;
      align-items: baseline;
      gap: 8px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    }

    .badge-data small {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-muted);
    }

    /* 区块 */
    .section-light {
      background-color: var(--light-bg);
    }

    .section-dark {
      background-color: var(--dark-bg);
      color: var(--text-light);
      position: relative;
    }

    .section-dark::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(240,84,12,0.15) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
      pointer-events: none;
    }

    .hero-bg {
      background: var(--dark-bg);
      position: relative;
      overflow: hidden;
    }

    .hero-bg::after {
      content: '';
      position: absolute;
      top: -100px;
      right: -100px;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(240,84,12,0.2) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }

    /* 手风琴 */
    .accordion-custom .accordion-item {
      border-radius: var(--radius-md) !important;
      border: 1px solid var(--border-light);
      margin-bottom: 12px;
      background: #fff;
      overflow: hidden;
    }

    .accordion-custom .accordion-button {
      font-weight: 600;
      font-size: 16px;
      box-shadow: none;
      padding: 18px 20px;
      background: #fff;
      color: var(--text-dark);
      transition: var(--transition);
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      background: #fff;
      color: var(--primary);
      border-left: 3px solid var(--primary);
    }

    .accordion-custom .accordion-button::after {
      filter: brightness(0.5);
    }

    .accordion-custom .accordion-body {
      font-size: 15px;
      color: #5a5e64;
      padding: 16px 20px;
    }

    .footer-custom {
      background: #14161A;
      color: #C0C5CE;
      border-top: 2px solid var(--primary);
    }

    @media (max-width: 991px) {
      h1 { font-size: 40px; }
      h2 { font-size: 28px; }
      .navbar-collapse {
        background: rgba(26,29,34,0.95);
        backdrop-filter: blur(20px);
        padding: 20px;
        border-radius: 20px;
        margin-top: 10px;
      }
    }

    @media (max-width: 575px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .btn-primary-custom, .btn-outline-custom { padding: 12px 24px; font-size: 15px; }
    }