/* roulang page: index */
:root {
      --deep-green: #0F2A25;
      --sand-gold: #C8A96E;
      --warm-white: #F7F4EF;
      --matte-black: #1A1A1A;
      --patina-green: #5B8C7A;
      --gold-hover: #B8934A;
      --border-light: rgba(15, 42, 37, 0.08);
      --shadow-card: 0 2px 16px rgba(15, 42, 37, 0.06);
      --shadow-hover: 0 8px 32px rgba(15, 42, 37, 0.12);
      --radius-card: 8px;
      --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--warm-white);
      color: var(--matte-black);
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      font-weight: 400;
      line-height: 1.75;
      margin: 0;
      overflow-x: hidden;
      padding-top: 72px;
    }

    h1, h2, h3, .serif-font {
      font-family: 'Noto Serif SC', 'Times New Roman', serif;
      font-weight: 700;
    }

    .inter-font {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
    }

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 40px;
      padding-right: 40px;
    }

    /* 导航栏 */
    .navbar-custom {
      background: rgba(247, 244, 239, 0.95);
      backdrop-filter: blur(12px);
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition-smooth);
    }

    .navbar-brand {
      font-family: 'Noto Serif SC', serif;
      font-weight: 700;
      font-size: 24px;
      color: var(--deep-green) !important;
      letter-spacing: 1px;
      position: relative;
      padding-left: 18px;
    }

    .navbar-brand::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 24px;
      background-color: var(--sand-gold);
      border-radius: 2px;
    }

    .nav-link {
      font-size: 15px;
      letter-spacing: 1px;
      color: var(--deep-green) !important;
      margin: 0 8px;
      font-weight: 500;
      position: relative;
      padding: 8px 4px !important;
      transition: color 0.3s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background-color: var(--sand-gold);
      transition: width 0.3s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .btn-primary-gold {
      background: var(--sand-gold);
      border: none;
      color: var(--deep-green);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: 30px;
      transition: var(--transition-smooth);
      letter-spacing: 1px;
    }

    .btn-primary-gold:hover {
      background: var(--gold-hover);
      color: var(--deep-green);
      transform: translateY(-2px);
    }

    .btn-outline-dark-green {
      background: transparent;
      border: 1px solid var(--deep-green);
      color: var(--deep-green);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: 30px;
      transition: var(--transition-smooth);
    }

    .btn-outline-dark-green:hover {
      background: var(--deep-green);
      color: white;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: #FFFFFF;
      box-shadow: 0 -1px 8px rgba(0,0,0,0.05);
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1030;
      border-top: 1px solid rgba(15,42,37,0.08);
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(15, 42, 37, 0.6);
      text-decoration: none;
      font-size: 10px;
      transition: 0.2s;
    }

    .mobile-nav-item i {
      font-size: 20px;
      margin-bottom: 2px;
    }

    .mobile-nav-item.active {
      color: var(--sand-gold);
    }

    @media (min-width: 768px) {
      .mobile-bottom-nav {
        display: none;
      }
      body {
        padding-bottom: 0;
      }
    }

    @media (max-width: 767.98px) {
      body {
        padding-bottom: 70px;
        padding-top: 56px;
      }
      .navbar-custom {
        height: 56px;
      }
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* Hero */
    .hero-section {
      background-color: var(--deep-green);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
    }

    .hero-title {
      font-size: clamp(36px, 5vw, 64px);
      color: var(--warm-white);
      line-height: 1.2;
    }

    .hero-sub {
      color: rgba(247, 244, 239, 0.85);
      font-size: 18px;
      margin: 24px 0 32px;
    }

    .section-padding {
      padding: 100px 0;
    }

    @media (max-width: 767px) {
      .section-padding {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 2.2rem;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 2px;
      background: var(--sand-gold);
      margin-top: 12px;
    }

    .card-custom {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .bg-deep-green {
      background-color: var(--deep-green);
    }

    .text-gold {
      color: var(--sand-gold);
    }

    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--deep-green);
      box-shadow: none;
      border-left: 3px solid var(--sand-gold);
    }

    .accordion-button:focus {
      border-color: var(--sand-gold);
      box-shadow: none;
    }

    .footer-link {
      color: rgba(247, 244, 239, 0.7);
      text-decoration: none;
      transition: 0.3s;
    }

    .footer-link:hover {
      color: var(--sand-gold);
    }