/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary: #D35400;
      --primary-hover: #B84500;
      --primary-glow: rgba(211, 84, 0, 0.5);
      --secondary: #1A1C2A;
      --surface-warm: #F5F0EB;
      --accent-gold: #FFB347;
      --text-on-dark: #F5F0EB;
      --text-on-light: #1A1C2A;
      --text-muted: #6B6B7B;
      --glass-bg: rgba(26, 28, 42, 0.7);
      --glass-border: rgba(245, 240, 235, 0.15);
      --radius-card: 16px;
      --radius-btn: 30px;
      --shadow-card: 0 8px 32px rgba(26, 28, 42, 0.12);
      --shadow-hover: 0 16px 40px rgba(26, 28, 42, 0.25);
      --transition-smooth: all 0.3s ease;
      --font-family: system-ui, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --section-padding: 70px 0;
      --mobile-padding: 40px 0;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-family);
      line-height: 1.7;
      background-color: var(--surface-warm);
      color: var(--text-on-light);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    h1, h2, h3, h4 {
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

    h4 {
      font-size: 1.15rem;
      font-weight: 600;
    }

    .text-muted {
      color: var(--text-muted);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      display: inline-block;
      box-shadow: 0 0 20px var(--primary-glow);
      transition: var(--transition-smooth);
      letter-spacing: 0.3px;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 30px rgba(211, 84, 0, 0.7);
      color: white;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: 0 8px 32px rgba(0,0,0,0.2);
      padding: 28px;
      color: var(--text-on-dark);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 18px 40px rgba(0,0,0,0.35);
    }

    /* 导航栏 */
    .custom-nav {
      background: rgba(26, 28, 42, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 100;
      border-bottom: 1px solid rgba(245,240,235,0.1);
      padding: 12px 0;
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo span {
      color: var(--text-on-dark);
      font-weight: 400;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      color: var(--text-on-dark);
      font-weight: 500;
      font-size: 1rem;
      padding: 6px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--accent-gold);
    }

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

    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      flex-direction: column;
      cursor: pointer;
      gap: 5px;
    }

    .menu-toggle span {
      width: 26px;
      height: 2px;
      background: var(--text-on-dark);
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(26,28,42,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 30px;
        gap: 1.8rem;
        text-align: center;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
    }

    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(26,28,42,0.7) 0%, rgba(26,28,42,0.3) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: var(--text-on-dark);
      position: relative;
    }

    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 50px;
    }

    .hero-left {
      flex: 1 1 500px;
    }

    .hero-right {
      flex: 1 1 350px;
    }

    .hero h1 {
      margin-bottom: 1.5rem;
    }

    .hero-sub {
      font-size: 1.25rem;
      margin-bottom: 2rem;
      opacity: 0.9;
    }

    /* 板块通用 */
    section {
      padding: var(--section-padding);
    }

    @media (max-width: 640px) {
      section {
        padding: var(--mobile-padding);
      }
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }

    .warm-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 24px;
      transition: var(--transition-smooth);
    }

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

    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
    }

    /* 证言区 */
    .testimonial-card {
      background: var(--surface-warm);
      border-radius: var(--radius-card);
      padding: 32px;
      position: relative;
    }

    .quote-mark {
      font-size: 4rem;
      color: rgba(211,84,0,0.2);
      position: absolute;
      top: 0;
      left: 20px;
      line-height: 1;
    }

    /* FAQ 手风琴覆盖 */
    .accordion-title {
      background: var(--surface-warm);
      border-radius: 8px;
      font-weight: 600;
      color: var(--text-on-light);
      border: 1px solid #e0d7cd;
    }

    .accordion-item.is-active .accordion-title {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .footer-dark {
      background: var(--secondary);
      color: var(--text-on-dark);
      padding: 50px 0 20px;
    }

    .footer-dark a {
      color: #ccc;
    }

    .footer-dark a:hover {
      color: var(--accent-gold);
    }

    .divider {
      border-top: 1px solid rgba(245,240,235,0.2);
      margin: 25px 0;
    }