/* roulang page: index */
:root {
      --deep-charcoal: #1E2D2B;
      --sandstone-gold: #C4A77D;
      --matte-copper: #B87333;
      --warm-white: #FBF7F2;
      --text-primary: #1E2D2B;
      --text-secondary: #5B6A67;
      --text-reverse: #FFFFFF;
      --border-soft: #E8E3DC;
      --bg-card: #FFFFFF;
      --shadow-sm: 0px 4px 20px rgba(30,45,43,0.06);
      --shadow-hover: 0px 12px 32px rgba(30,45,43,0.1);
      --radius-card: 12px;
      --radius-button: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      margin-top: 0;
      letter-spacing: -0.3px;
    }

    h2 {
      font-size: 2.25rem;
      line-height: 1.3;
      margin-bottom: 1.5rem;
      color: var(--deep-charcoal);
    }

    h3 {
      font-size: 1.5rem;
      line-height: 1.4;
      margin-bottom: 0.75rem;
      color: var(--deep-charcoal);
    }

    p {
      font-size: 1rem;
      line-height: 1.75;
      color: var(--text-secondary);
      margin-bottom: 1.25rem;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 玻璃导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(251,247,242,0.7);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(196,167,125,0.2);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .glass-nav.scrolled {
      background: #FBF7F2;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.9rem 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--deep-charcoal);
      text-decoration: none;
      letter-spacing: 1px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      color: var(--deep-charcoal);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }

    .nav-links a:hover {
      color: var(--sandstone-gold);
      border-bottom-color: var(--sandstone-gold);
    }

    .btn-primary-nav {
      background: var(--matte-copper);
      color: white !important;
      padding: 0.6rem 1.5rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary-nav:hover {
      background: #9C5E2B;
      box-shadow: 0 4px 12px rgba(184,115,51,0.3);
      color: white;
    }

    .mobile-menu-icon {
      display: none;
      font-size: 1.6rem;
      color: var(--deep-charcoal);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(rgba(30,45,43,0.7), rgba(30,45,43,0.8)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      padding-top: 5rem;
      color: white;
      width: 100%;
    }

    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 2rem;
    }

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

    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 1.5rem;
    }

    .hero p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--matte-copper);
      color: white;
      padding: 0.9rem 2rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      text-decoration: none;
      transition: background 0.25s, box-shadow 0.25s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #9C5E2B;
      box-shadow: 0 8px 18px rgba(184,115,51,0.3);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--sandstone-gold);
      color: var(--sandstone-gold);
      padding: 0.9rem 2rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: rgba(196,167,125,0.1);
      color: var(--sandstone-gold);
    }

    .section {
      padding: 5rem 0;
    }

    .problem-list {
      list-style: none;
      padding: 0;
    }
    .problem-list li {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
      margin-bottom: 1.5rem;
      font-size: 1.1rem;
    }
    .problem-icon {
      color: var(--matte-copper);
      font-size: 1.5rem;
    }

    .solution-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }

    .solution-card {
      background: #FFFFFF;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--sandstone-gold);
    }

    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
      gap: 2rem;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--matte-copper);
    }

    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 1.5rem;
      align-items: center;
      flex-wrap: wrap;
    }

    .accordion-item {
      border: 1px solid var(--border-soft);
      border-radius: 8px;
      margin-bottom: 1rem;
      background: white;
    }
    .accordion-title {
      background: transparent;
      padding: 1rem 1.5rem;
      font-weight: 600;
      cursor: pointer;
      transition: color 0.2s;
    }
    .accordion-title:hover {
      color: var(--sandstone-gold);
    }
    .accordion-content {
      padding: 0 1.5rem 1.5rem;
      background: #FAF8F5;
    }

    .footer {
      background: var(--deep-charcoal);
      color: rgba(255,255,255,0.8);
      padding: 3rem 0 1.5rem;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-icon {
        display: block;
      }
      h2 {
        font-size: 1.9rem;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 640px) {
      .hero {
        min-height: 85vh;
      }
    }