/* roulang page: index */
:root {
      --primary-deep: #1E1E24;
      --accent-copper: #C8A06E;
      --accent-signal: #00B4A6;
      --bg-warm: #FAF8F6;
      --white: #FFFFFF;
      --text-body: #4A4A55;
      --text-muted: #6B6B78;
      --border-light: #EBE9E6;
      --border-subtle: #E5E2DE;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
      --shadow-copper: 0 4px 14px rgba(200, 160, 110, 0.35);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: all 0.2s ease;
      --font-sans: 'Inter', 'SF Pro Display', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding-top: 80px;
    }

    h1, h2, h3, h4, .nav-logo {
      color: var(--primary-deep);
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.15;
    }
    h2 {
      font-size: 36px;
      font-weight: 650;
      line-height: 1.2;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      line-height: 1.3;
    }

    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航 SaaS 命令栏风格 */
    .navbar {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      display: flex;
      align-items: center;
      padding: 0;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .nav-logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-deep);
      text-decoration: none;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }
    .nav-logo i {
      color: var(--accent-copper);
      font-size: 26px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      margin-left: auto;
      margin-right: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      position: relative;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-link:hover {
      color: var(--accent-copper);
    }
    .nav-link.active {
      color: var(--accent-copper);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-copper);
      border-radius: 2px;
    }

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

    .search-box {
      background: #F5F3F0;
      border-radius: 40px;
      padding: 8px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted);
      font-size: 14px;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .search-box i {
      font-size: 14px;
      color: var(--text-muted);
    }
    .search-box input {
      background: transparent;
      border: none;
      outline: none;
      font-size: 14px;
      width: 110px;
      color: var(--primary-deep);
    }
    .search-box input::placeholder {
      color: var(--text-muted);
    }

    .btn-primary-copper {
      background: var(--accent-copper);
      border: none;
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition);
      box-shadow: var(--shadow-copper);
      white-space: nowrap;
    }
    .btn-primary-copper:hover {
      background: #B08D5A;
      box-shadow: 0 6px 18px rgba(200, 160, 110, 0.4);
      color: white;
    }

    .btn-outline-dark {
      border: 1px solid var(--primary-deep);
      background: transparent;
      color: var(--primary-deep);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-dark:hover {
      border-color: var(--accent-copper);
      color: var(--accent-copper);
      background: transparent;
    }

    .btn-sm-copper {
      padding: 10px 24px;
      font-size: 14px;
    }

    /* Hero */
    #hero {
      padding: 80px 0 100px;
    }
    .metric-board {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .metric-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 16px 0;
    }
    .metric-item:last-child {
      border-bottom: none;
    }
    .metric-number {
      font-size: 38px;
      font-weight: 700;
      color: var(--accent-signal);
      line-height: 1.2;
      display: block;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 卡片通用 */
    .card-custom {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-md);
      border-color: rgba(200, 160, 110, 0.3);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: #F5F3F0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      color: var(--accent-copper);
      transition: var(--transition);
      margin-bottom: 24px;
    }
    .card-custom:hover .icon-circle {
      background: rgba(200, 160, 110, 0.15);
      color: #B08D5A;
    }

    .contrast-bar {
      height: 10px;
      border-radius: 10px;
      margin: 12px 0 8px;
      background: #E5E2DE;
    }
    .bar-fill {
      height: 100%;
      border-radius: 10px;
      width: 0%;
    }

    .accordion-button {
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-deep);
      background: transparent;
      box-shadow: none;
      border-bottom: 1px solid var(--border-subtle);
      padding: 20px 0;
    }
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--accent-copper);
      box-shadow: none;
    }
    .accordion-button::after {
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      content: "\2b";
      background-image: none;
      color: var(--accent-copper);
      font-size: 20px;
    }
    .accordion-button:not(.collapsed)::after {
      content: "\f068";
    }

    footer {
      background: var(--primary-deep);
      color: #A0A0A8;
    }
    footer h5 {
      color: white;
      font-weight: 600;
      margin-bottom: 20px;
    }
    footer a {
      color: #A0A0A8;
      text-decoration: none;
      transition: var(--transition);
    }
    footer a:hover {
      color: var(--accent-copper);
    }

    @media (max-width: 992px) {
      h1 { font-size: 38px; }
      .nav-links { display: none; }
      .search-box { width: 100px; }
    }
    @media (max-width: 768px) {
      .navbar { height: auto; padding: 12px 0; }
      body { padding-top: 100px; }
    }