/* roulang page: index */
:root {
      --primary-burgundy: #800020;
      --primary-charcoal: #0F0F0F;
      --accent-gold: #C9A96E;
      --light-gray: #F5F3EF;
      --white: #ffffff;
      --text-dark: #1a1a1a;
      --text-muted: #6c757d;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --transition-smooth: 0.3s ease;
      --font-sans: system-ui, -apple-system, 'Segoe UI', 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 自定义容器微调 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航系统 - 透明玻璃沉浸 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(15,15,15,0.25);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
      transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      padding: 12px 0;
    }
    .navbar-custom.scrolled {
      background: #0F0F0F;
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      box-shadow: 0 8px 30px rgba(0,0,0,0.15);
    }
    .navbar-brand-custom {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: white;
      text-transform: uppercase;
      transition: color 0.2s;
    }
    .navbar-brand-custom:hover {
      color: var(--accent-gold);
    }
    .nav-link-custom {
      color: rgba(255,255,255,0.85) !important;
      font-weight: 500;
      margin: 0 12px;
      padding: 8px 4px !important;
      position: relative;
      font-size: 1rem;
      transition: color 0.2s;
    }
    .nav-link-custom:hover {
      color: white !important;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }
    .nav-link-custom:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--primary-burgundy);
      color: white;
      border: none;
      border-radius: var(--border-radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.25s, transform 0.2s;
      margin-left: 16px;
    }
    .btn-nav-cta:hover {
      background: #6B0018;
      transform: scale(1.03);
      color: white;
    }
    /* 移动端导航 */
    @media (max-width: 991px) {
      .navbar-collapse-custom {
        background: rgba(15,15,15,0.95);
        backdrop-filter: blur(20px);
        padding: 20px;
        border-radius: 16px;
        margin-top: 10px;
      }
      .nav-link-custom {
        margin: 8px 0;
      }
      .btn-nav-cta {
        margin-left: 0;
        margin-top: 10px;
        width: 100%;
        text-align: center;
      }
    }
    /* Hero 区域 */
    .hero-section {
      min-height: 100vh;
      background-color: var(--primary-charcoal);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      background-blend-mode: overlay;
      display: flex;
      align-items: center;
      position: relative;
      padding-top: 80px;
    }
    .hero-overlay {
      position: absolute;
      top:0;left:0;width:100%;height:100%;
      background: rgba(15,15,15,0.65);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.5rem;
    }
    .btn-primary-custom {
      background: var(--primary-burgundy);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 40px;
      border-radius: var(--border-radius-btn);
      font-size: 1.1rem;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(128,0,32,0.3);
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: #6B0018;
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(128,0,32,0.5);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-burgundy);
      color: var(--primary-burgundy);
      font-weight: 600;
      padding: 12px 36px;
      border-radius: var(--border-radius-btn);
      transition: 0.25s;
    }
    .btn-outline-custom:hover {
      background: var(--primary-burgundy);
      color: white;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.5rem;
      }
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .bg-light-gray {
      background-color: var(--light-gray);
    }
    .bg-burgundy {
      background-color: var(--primary-burgundy);
      color: white;
    }
    .bg-charcoal {
      background-color: var(--primary-charcoal);
      color: white;
    }
    /* 卡片系统 */
    .card-custom {
      background: white;
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all var(--transition-smooth);
      padding: 32px;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-card-large {
      border-left: 4px solid var(--primary-burgundy);
    }
    .icon-gold {
      color: var(--accent-gold);
      font-size: 2rem;
      margin-bottom: 16px;
    }
    /* 数据数字 */
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 1rem;
      color: rgba(255,255,255,0.8);
    }
    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 28px;
      display: flex;
      align-items: flex-start;
      gap: 20px;
      box-shadow: var(--shadow-sm);
    }
    .testimonial-avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background-size: cover;
      background-position: center;
      flex-shrink: 0;
      border: 2px solid var(--accent-gold);
    }
    .testimonial-quote {
      font-style: italic;
      color: #333;
      margin-bottom: 12px;
    }
    .testimonial-name {
      font-weight: 700;
      color: var(--primary-burgundy);
    }
    /* FAQ 手风琴覆盖 */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid #eee;
      background: transparent;
    }
    .accordion-custom .accordion-button {
      background: white;
      color: var(--text-dark);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 20px 0;
      box-shadow: none;
      transition: color 0.2s;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--primary-burgundy);
      background: transparent;
      box-shadow: none;
    }
    .accordion-custom .accordion-button:focus {
      border-color: transparent;
      box-shadow: none;
    }
    .accordion-custom .accordion-body {
      padding: 0 0 20px 0;
      color: #555;
    }
    /* CTA 脉冲 */
    .btn-pulse {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(201,169,110,0.6); }
      70% { box-shadow: 0 0 0 15px rgba(201,169,110,0); }
      100% { box-shadow: 0 0 0 0 rgba(201,169,110,0); }
    }
    /* 页脚 */
    .footer-custom {
      background: #0a0a0a;
      color: #aaa;
      padding: 40px 0;
      font-size: 0.95rem;
    }
    .footer-brand {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: 2px;
    }