/* roulang page: index */
:root {
      --primary: #1E2D2F;
      --primary-light: #2A3C3F;
      --accent: #C8A97E;
      --accent-hover: #B8935C;
      --accent-light: rgba(200, 169, 126, 0.15);
      --bg-main: #F7F5F2;
      --bg-secondary: #EAEDEB;
      --bg-dark: #1E2D2F;
      --text-dark: #1E2D2F;
      --text-body: #3A3F42;
      --text-muted: #6B7280;
      --text-light: #F0EDE8;
      --border-light: #E5E0D9;
      --border-soft: rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-mega: 0 20px 40px rgba(0,0,0,0.08);
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Inter', 'Noto Sans SC', sans-serif;
      --section-padding: 100px;
    }
    * { box-sizing: border-box; }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-main);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, .font-serif { font-family: var(--font-serif); }
    a { text-decoration: none; color: inherit; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; display: block; }
    .container { max-width: 1200px; }

    /* 导航 */
    .navbar-custom {
      height: 72px;
      background: rgba(247, 245, 242, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      padding: 0 1.5rem;
      transition: all 0.3s;
    }
    .navbar-brand-custom {
      font-family: var(--font-serif);
      font-size: 22px;
      font-weight: 700;
      color: var(--text-dark) !important;
      letter-spacing: 0.5px;
    }
    .nav-link-custom {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body) !important;
      margin: 0 0.25rem;
      padding: 0.5rem 0.9rem !important;
      border-radius: 6px;
      transition: 0.2s;
    }
    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--accent) !important;
      background: var(--accent-light);
    }
    .mega-trigger {
      cursor: pointer;
      font-weight: 500;
      color: var(--text-body);
      padding: 0.5rem 1rem;
      border-radius: 6px;
      transition: 0.2s;
      position: relative;
    }
    .mega-trigger:hover { color: var(--accent); background: var(--accent-light); }
    .mega-panel {
      display: none;
      position: absolute;
      top: 65px;
      right: 1.5rem;
      width: 600px;
      background: #FFFFFF;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-mega);
      padding: 2rem;
      z-index: 1050;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      border: 1px solid var(--border-soft);
    }
    .mega-panel.show { display: grid; }
    .mega-col h4 {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-dark);
      font-family: var(--font-sans);
    }
    .mega-item {
      display: block;
      padding: 0.65rem 0.8rem;
      border-radius: 8px;
      color: var(--text-body);
      transition: 0.2s;
      font-size: 15px;
    }
    .mega-item:hover { background: var(--bg-secondary); color: var(--accent); }
    .mega-mini-card {
      background: var(--bg-main);
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 0.75rem;
    }
    .mega-mini-card img { width: 100%; height: 80px; object-fit: cover; }
    .mega-mini-card span { display: block; padding: 0.4rem 0.6rem; font-size: 13px; color: var(--text-body); }

    .navbar-toggler { border: none; color: var(--text-dark); font-size: 1.5rem; }
    .navbar-toggler:focus { box-shadow: none; }
    @media (max-width: 991px) {
      .mega-panel { display: none !important; }
      .navbar-collapse { background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); border-radius: 0 0 16px 16px; padding: 1.5rem; }
    }

    /* 区块通用 */
    .section-block { padding: var(--section-padding) 0; }
    @media (max-width: 768px) { .section-block { padding: 60px 0; } }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--bg-main);
      position: relative;
      overflow: hidden;
    }
    #hero::after {
      content: "";
      position: absolute;
      right: -80px;
      bottom: -80px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(200,169,126,0.08) 0%, transparent 70%);
      border-radius: 50%;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.25;
      margin-bottom: 1rem;
    }
    .hero-content .subtitle {
      font-size: 1.25rem;
      color: var(--text-body);
      margin-bottom: 0.75rem;
      font-weight: 400;
    }
    .hero-content .pain-hint {
      font-size: 1rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }
    .hero-visual {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 400px;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
    }
    .hero-visual::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(30,45,47,0.25) 0%, rgba(30,45,47,0.05) 100%);
    }
    .btn-primary-custom {
      background: var(--accent);
      color: var(--primary);
      font-weight: 600;
      border: none;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      transition: all 0.25s;
      font-size: 1rem;
    }
    .btn-primary-custom:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      color: var(--primary);
    }
    .btn-link-custom {
      color: var(--accent);
      font-weight: 600;
      border-bottom: 2px solid transparent;
      padding-bottom: 2px;
    }
    .btn-link-custom:hover { border-bottom-color: var(--accent); color: var(--accent-hover); }
    @media (max-width: 768px) {
      .hero-content h1 { font-size: 2rem; }
      .hero-visual { min-height: 250px; margin-top: 2rem; }
    }

    /* 痛点 */
    #pain-points { background-color: var(--bg-secondary); }
    .pain-card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      padding: 2rem;
      border-left: 3px solid var(--accent);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .pain-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-4px); }
    .pain-card h3 { font-size: 1.5rem; font-weight: 600; color: var(--text-dark); margin-bottom: 0.5rem; }

    /* 方案 */
    .solution-list { list-style: none; padding: 0; }
    .solution-list li {
      display: flex;
      align-items: flex-start;
      margin-bottom: 0.8rem;
      font-size: 1rem;
    }
    .solution-list li i { color: var(--accent); margin-right: 0.75rem; margin-top: 0.15rem; }
    .solution-img {
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      min-height: 350px;
      border-radius: 20px;
    }

    /* 数据统计 */
    .stat-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-serif);
      line-height: 1.1;
    }
    .stat-label { font-size: 0.95rem; color: var(--text-muted); }

    /* 证言 */
    .testimonial-card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      transition: 0.3s;
    }
    .testimonial-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-3px); }
    .testimonial-avatar {
      width: 56px; height: 56px; border-radius: 50%; object-fit: cover; flex-shrink: 0;
      background: var(--bg-secondary);
    }
    .testimonial-text { font-style: italic; color: var(--text-body); margin-bottom: 0.5rem; }

    /* FAQ 手风琴覆盖 */
    .accordion-custom .accordion-item {
      border: none;
      background: transparent;
      margin-bottom: 0.75rem;
    }
    .accordion-custom .accordion-button {
      background: var(--bg-main);
      color: var(--text-dark);
      font-weight: 600;
      border-radius: var(--radius-card) !important;
      box-shadow: none;
      padding: 1.25rem 1.5rem;
      transition: 0.3s;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: #FFFFFF;
      color: var(--accent);
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .accordion-custom .accordion-body {
      background: #FFFFFF;
      border-radius: 0 0 var(--radius-card) var(--radius-card);
      padding: 1rem 1.5rem 1.5rem;
      color: var(--text-body);
    }

    /* CTA 深色区 */
    #cta {
      background-color: var(--bg-dark);
      color: var(--text-light);
      padding: 80px 0;
    }
    #cta h2 { color: #FFFFFF; }

    /* Footer */
    footer {
      background: var(--bg-dark);
      color: #D1CFC8;
      padding: 60px 0 30px;
    }
    footer a { color: #D1CFC8; }
    footer a:hover { color: var(--accent); }
    .footer-brand { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 700; color: #FFFFFF; }

    /* 滚动渐现 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 576px) {
      .stat-number { font-size: 2.5rem; }
      .btn-primary-custom { width: 100%; text-align: center; }
    }