/* roulang page: index */
:root {
      --primary-deep: #3E2723;
      --accent-gold: #B8860B;
      --bg-warm: #FAF6F2;
      --text-main: #2B241E;
      --text-secondary: #6B5E53;
      --text-on-dark: #F5EFE6;
      --accent-red: #A13D2F;
      --card-bg: #FFFFFF;
      --gold-border: rgba(184, 134, 11, 0.25);
      --shadow-sm: 0 4px 20px rgba(44, 30, 22, 0.06);
      --shadow-hover: 0 8px 30px rgba(44, 30, 22, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', system-ui, -apple-system, sans-serif;
      --transition-smooth: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    .container {
      max-width: 1280px;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航自定义 */
    .navbar {
      padding: 12px 0;
      transition: background-color 0.4s ease, box-shadow 0.3s ease;
      backdrop-filter: blur(8px);
      background-color: transparent;
    }

    .navbar.scrolled {
      background-color: rgba(250, 246, 242, 0.95);
      box-shadow: 0 1px 10px rgba(0,0,0,0.03);
      border-bottom: 1px solid rgba(184,134,11,0.1);
    }

    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 20px;
      color: var(--accent-gold) !important;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 26px;
      height: 26px;
      border: 1.5px solid var(--accent-gold);
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      color: var(--accent-gold);
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: #4A3F38 !important;
      margin: 0 10px;
      position: relative;
      padding: 8px 4px !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-gold);
      transition: width 0.3s ease;
    }
    .nav-link:hover {
      color: var(--accent-gold) !important;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-cta-nav {
      background-color: var(--accent-red);
      color: white !important;
      border-radius: var(--radius-btn);
      padding: 10px 22px !important;
      font-weight: 500;
      font-size: 15px;
      margin-left: 18px;
      border: none;
      transition: 0.3s;
      white-space: nowrap;
    }
    .btn-cta-nav:hover {
      background-color: #7A2E22;
      transform: scale(1.02);
    }

    .offcanvas {
      background-color: #2C1E16;
      color: var(--text-on-dark);
    }
    .offcanvas .nav-link {
      color: #E5D9CC !important;
      font-size: 18px;
      margin: 12px 0;
    }
    .offcanvas .btn-cta-nav {
      display: block;
      width: 100%;
      margin: 20px 0 0 0;
    }

    /* 按钮体系 */
    .btn-primary-gold {
      background: var(--primary-deep);
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 500;
      transition: 0.3s;
    }
    .btn-primary-gold:hover {
      background: var(--accent-gold);
      color: #1A120D;
      border-color: var(--accent-gold);
    }
    .btn-outline-gold {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--primary-deep);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 500;
    }
    .btn-outline-gold:hover {
      background: rgba(184,134,11,0.08);
      border-color: #8B6914;
      color: #3E2723;
    }
    .btn-red-cta {
      background: var(--accent-red);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 34px;
      font-weight: 600;
      transition: 0.3s;
      display: inline-block;
    }
    .btn-red-cta:hover {
      background: #7A2E22;
      transform: scale(1.02);
      color: white;
    }

    /* 卡片 */
    .card-custom {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 0.5px solid rgba(184,134,11,0.12);
      padding: 32px 28px;
      transition: var(--transition-smooth);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover), 0 0 0 1px rgba(184,134,11,0.2);
      transform: translateY(-4px);
    }
    .icon-gold-line {
      color: var(--accent-gold);
      font-size: 36px;
      margin-bottom: 18px;
    }

    /* Hero */
    .hero-section {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FAF6F2 0%, #F2E8DC 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-art {
      background: radial-gradient(circle at 30% 40%, rgba(184,134,11,0.08) 0%, transparent 50%);
      position: absolute;
      width: 100%;
      height: 100%;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 28px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 28px;
      border-radius: var(--radius-card);
      background: white;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }
    .masonry-item:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      border-radius: 12px 12px 0 0;
      object-fit: cover;
    }

    /* 方案对比卡 */
    .compare-card {
      background: white;
      border-radius: 16px;
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      border: 0.5px solid transparent;
    }
    .compare-card.recommended {
      border: 1px solid var(--accent-gold);
      box-shadow: 0 10px 30px rgba(184,134,11,0.1);
    }

    /* FAQ */
    .accordion-button {
      font-weight: 500;
      font-size: 18px;
      background: white;
      color: var(--text-main);
      box-shadow: none;
      border-radius: 8px !important;
    }
    .accordion-button:not(.collapsed) {
      background: #FCF9F5;
      color: var(--primary-deep);
      border-left: 3px solid var(--accent-gold);
    }

    footer {
      background: linear-gradient(180deg, #2C1E16 0%, #1A120D 100%);
      color: #C4B6A6;
    }

    @media (max-width: 992px) {
      .masonry-grid {
        column-count: 2;
      }
      .navbar .navbar-collapse {
        background: rgba(250,246,242,0.98);
      }
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
      .hero-section {
        min-height: auto;
        padding: 100px 0 60px;
      }
    }