/* roulang page: index */
:root {
      --deep-slate: #2E3A46;
      --slate-gray: #5B6770;
      --brass-gold: #B8976A;
      --brass-hover: #9E7F5A;
      --parchment: #F7F4ED;
      --card-bg: #FDFBF7;
      --border-light: #E5DFD5;
      --burgundy: #7A3B3E;
      --white: #FFFFFF;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Helvetica Neue', sans-serif;
      --font-display: 'Playfair Display', Georgia, serif;
      --shadow-sm: 0 2px 8px rgba(46,58,70,0.06);
      --shadow-hover: 0 6px 18px rgba(46,58,70,0.1);
      --radius: 6px;
      --transition: all 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--parchment);
      color: var(--slate-gray);
      line-height: 1.7;
      font-size: 15px;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--deep-slate);
      font-weight: 600;
      letter-spacing: 0.3px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1140px;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--brass-gold);
      border: none;
      color: white;
      font-weight: 500;
      padding: 0.7rem 2rem;
      border-radius: var(--radius);
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 2px 6px rgba(184,151,106,0.15);
    }
    .btn-primary-custom:hover {
      background-color: var(--brass-hover);
      color: white;
      box-shadow: 0 4px 12px rgba(158,127,90,0.25);
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--deep-slate);
      color: var(--deep-slate);
      font-weight: 500;
      padding: 0.7rem 2rem;
      border-radius: var(--radius);
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline-custom:hover {
      background-color: rgba(46,58,70,0.05);
      border-color: var(--deep-slate);
      color: var(--deep-slate);
      transform: translateY(-1px);
    }
    .btn-light-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
    }
    .btn-light-outline:hover {
      background: rgba(255,255,255,0.1);
      color: white;
      border-color: white;
    }
    
    /* 导航 */
    .navbar-brand-custom {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--deep-slate) !important;
      letter-spacing: 0.5px;
    }
    .navbar-brand-custom small {
      display: block;
      font-family: var(--font-display);
      font-size: 0.7rem;
      font-weight: 500;
      color: var(--brass-gold);
      letter-spacing: 1px;
      margin-top: -2px;
    }
    .navbar-top {
      background-color: var(--parchment);
      border-bottom: 1px solid var(--border-light);
      padding: 0.7rem 0;
    }
    .nav-pills-custom .nav-link {
      font-family: var(--font-sans);
      font-weight: 400;
      color: var(--slate-gray);
      background-color: #F0EDE5;
      border-radius: 30px;
      padding: 0.45rem 1.2rem;
      font-size: 0.9rem;
      margin: 0 0.2rem;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-pills-custom .nav-link:hover {
      background-color: var(--brass-gold);
      color: white;
    }
    .nav-pills-custom .nav-link.active {
      background-color: var(--brass-gold);
      color: white;
      font-weight: 500;
    }
    .navbar-tabs-row {
      background-color: rgba(247,244,237,0.95);
      backdrop-filter: blur(6px);
      border-bottom: 1px solid var(--border-light);
      padding: 0.5rem 0;
      overflow-x: auto;
      white-space: nowrap;
      -ms-overflow-style: none;
      scrollbar-width: none;
    }
    .navbar-tabs-row::-webkit-scrollbar {
      display: none;
    }
    
    /* Hero */
    .hero-section {
      position: relative;
      min-height: 90vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      background-attachment: fixed;
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-color: rgba(46,58,70,0.45);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 680px;
    }
    .hero-divider {
      width: 60px;
      height: 1px;
      background-color: var(--brass-gold);
      margin: 1.5rem 0;
    }
    .hero-title {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 2.8rem;
      line-height: 1.25;
      color: white;
    }
    .hero-sub {
      font-size: 1.1rem;
      font-weight: 300;
      color: rgba(255,255,255,0.9);
    }
    
    /* 区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 0.4rem;
      color: var(--deep-slate);
    }
    .section-sub {
      font-family: var(--font-display);
      font-size: 0.9rem;
      color: var(--brass-gold);
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 1rem;
    }
    
    /* 卡片 */
    .custom-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
    }
    .custom-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
      border-color: #d9cfbf;
    }
    .icon-brass {
      color: var(--brass-gold);
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    .data-number {
      font-family: var(--font-display);
      font-size: 2.8rem;
      font-weight: 600;
      color: var(--brass-gold);
      line-height: 1.2;
    }
    
    /* 深色区块 */
    .dark-block {
      background-color: var(--deep-slate);
      color: rgba(255,255,255,0.9);
    }
    
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: var(--parchment);
      color: var(--deep-slate);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--brass-gold);
      box-shadow: 0 0 0 0.15rem rgba(184,151,106,0.25);
    }
    
    footer {
      background: #F0EBE0;
      border-top: 1px solid var(--border-light);
    }
    
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .hero-section {
        min-height: 70vh;
        background-attachment: scroll;
      }
      .navbar-brand-custom {
        font-size: 1.2rem;
      }
    }