/* roulang page: index */
:root {
      --ink-black: #1A1D28;
      --amber-orange: #E8782A;
      --amber-hover: #C8651E;
      --limestone: #F5F2ED;
      --warm-white: #FFFFFF;
      --jade-green: #0F6B5C;
      --text-body: #3D404A;
      --text-muted: #787B84;
      --border-light: rgba(26, 29, 40, 0.08);
      --shadow-card: 0 1px 3px rgba(26,29,40,0.06), 0 6px 16px rgba(26,29,40,0.04);
      --shadow-hover: 0 8px 28px rgba(26,29,40,0.12), 0 2px 6px rgba(26,29,40,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: all 0.25s ease;
      --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
      --font-sans: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "JetBrains Mono", "SF Mono", "Consolas", monospace;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--limestone);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--ink-black);
      font-weight: 600;
    }
    
    .container {
      max-width: 1280px;
    }
    
    /* 导航栏双层杂志风格 */
    .navbar-custom {
      background-color: transparent;
      transition: var(--transition-smooth);
      padding: 0;
    }
    .brand-row {
      background-color: var(--warm-white);
      border-bottom: 1px solid var(--border-light);
      padding: 0.8rem 0;
    }
    .channel-row {
      background-color: var(--ink-black);
      padding: 0;
    }
    .navbar-scrolled .brand-row {
      padding: 0.4rem 0;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }
    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--ink-black);
      letter-spacing: 1px;
      text-decoration: none;
    }
    .logo-text span {
      color: var(--amber-orange);
    }
    .channel-link {
      font-family: var(--font-sans);
      font-weight: 500;
      font-size: 0.9rem;
      color: rgba(255,255,255,0.85);
      padding: 0.9rem 1.2rem;
      text-decoration: none;
      display: inline-block;
      border-bottom: 3px solid transparent;
      transition: var(--transition-smooth);
    }
    .channel-link:hover, .channel-link.active {
      color: var(--amber-orange);
      border-bottom-color: var(--amber-orange);
      background-color: rgba(255,255,255,0.05);
    }
    .navbar-toggler {
      border: none;
      color: var(--amber-orange);
      font-size: 1.6rem;
    }
    .navbar-toggler:focus {
      box-shadow: none;
    }
    @media (max-width: 991px) {
      .channel-row .navbar-nav {
        background-color: var(--ink-black);
        padding: 1rem;
      }
      .channel-link {
        display: block;
        border-bottom: none;
        padding: 0.7rem 1rem;
      }
    }
    
    /* Hero 背景纹理 */
    .hero-section {
      background-color: var(--limestone);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      background-blend-mode: overlay;
      position: relative;
      padding: 5rem 0 4rem;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(245, 242, 237, 0.92);
      backdrop-filter: blur(1px);
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    
    /* 数据看板卡片 */
    .metric-card {
      background: var(--warm-white);
      border-radius: var(--radius-card);
      padding: 1.5rem 1.2rem;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--jade-green);
      transition: var(--transition-smooth);
      text-align: center;
    }
    .metric-card.amber-border {
      border-left-color: var(--amber-orange);
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--ink-black);
    }
    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    
    /* 卡片通用 */
    .card-custom {
      background: var(--warm-white);
      border: none;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 按钮 */
    .btn-primary-custom {
      background-color: var(--amber-orange);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      box-shadow: 0 4px 10px rgba(232,120,42,0.2);
    }
    .btn-primary-custom:hover {
      background-color: var(--amber-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(232,120,42,0.3);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--ink-black);
      color: var(--ink-black);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
    }
    .btn-outline-custom:hover {
      background-color: var(--ink-black);
      color: white;
    }
    
    /* 服务卡片标签 */
    .badge-custom {
      background-color: rgba(15, 107, 92, 0.1);
      color: var(--jade-green);
      font-weight: 600;
      font-size: 0.75rem;
      padding: 0.25rem 0.8rem;
      border-radius: 20px;
    }
    
    /* Before/After */
    .compare-before {
      background-color: #f0ede8;
      border-radius: var(--radius-card);
      padding: 1.8rem;
      color: #5a5d66;
    }
    .compare-after {
      background-color: var(--warm-white);
      border-left: 5px solid var(--jade-green);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-card);
    }
    
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--ink-black);
      background-color: var(--warm-white);
      border: 1px solid transparent;
    }
    .accordion-button:not(.collapsed) {
      background-color: #fffaf5;
      border-color: var(--amber-orange);
      color: var(--ink-black);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--amber-orange);
    }
    
    /* 表单 */
    .form-control-custom {
      border-radius: 6px;
      border: 1px solid var(--text-muted);
      padding: 0.7rem 1rem;
      background: #fff;
    }
    .form-control-custom:focus {
      border-color: var(--amber-orange);
      box-shadow: 0 0 0 0.2rem rgba(232,120,42,0.15);
    }
    
    footer {
      background-color: var(--ink-black);
      color: #9A9DA6;
    }
    footer a {
      color: #9A9DA6;
      text-decoration: none;
    }
    footer a:hover {
      color: var(--amber-orange);
    }
    
    @media (max-width: 576px) {
      .metric-number {
        font-size: 1.8rem;
      }
      h1 {
        font-size: 2.4rem;
      }
    }