/* roulang page: index */
:root {
      --primary-dark: #1A1A1A;
      --accent-gold: #D4AF37;
      --accent-gold-hover: #B8962E;
      --bg-warm: #FAFAFA;
      --card-white: #FFFFFF;
      --text-body: #2C2C2C;
      --text-muted: #6B6B6B;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-sans: 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --font-numbers: 'Inter', 'DM Sans', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 600;
      letter-spacing: -0.3px;
      color: var(--primary-dark);
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      font-weight: 600;
    }

    h3 {
      font-size: 24px;
      font-weight: 600;
    }

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .navbar-custom {
      background-color: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      padding: 16px 0;
      transition: box-shadow 0.3s;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
    }
    .navbar-custom.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    }
    .logo-text {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 26px;
      letter-spacing: -0.5px;
      color: var(--primary-dark);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-text i {
      color: var(--accent-gold);
      font-size: 28px;
    }
    .nav-link-custom {
      color: var(--primary-dark) !important;
      font-weight: 500;
      margin: 0 12px;
      padding: 6px 2px !important;
      position: relative;
      transition: color 0.2s;
      font-size: 15px;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent-gold);
      transition: width 0.25s ease-out;
    }
    .nav-link-custom:hover::after,
    .nav-link-custom.active::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--accent-gold);
      color: var(--primary-dark);
      font-weight: 600;
      border-radius: 8px;
      padding: 10px 24px;
      border: none;
      transition: background 0.2s, color 0.2s;
      font-size: 15px;
    }
    .btn-nav-cta:hover {
      background: var(--accent-gold-hover);
      color: white;
    }
    .navbar-toggler {
      border: none;
      color: var(--primary-dark);
      font-size: 24px;
    }
    .offcanvas-custom {
      background: var(--bg-warm);
    }
    .offcanvas-custom .nav-link-custom {
      font-size: 18px;
      margin: 12px 0;
    }

    /* 按钮系统 */
    .btn-primary-gold {
      background: var(--accent-gold);
      color: var(--primary-dark);
      font-weight: 600;
      border-radius: 8px;
      padding: 14px 32px;
      border: none;
      transition: background 0.3s, color 0.3s, transform 0.2s;
      font-size: 16px;
      letter-spacing: -0.2px;
    }
    .btn-primary-gold:hover {
      background: var(--accent-gold-hover);
      color: white;
      transform: translateY(-2px);
    }
    .btn-outline-dark-custom {
      background: transparent;
      border: 2px solid var(--primary-dark);
      color: var(--primary-dark);
      font-weight: 600;
      border-radius: 8px;
      padding: 14px 32px;
      transition: 0.3s;
    }
    .btn-outline-dark-custom:hover {
      background: var(--primary-dark);
      color: white;
    }

    /* 区块间距 */
    section {
      padding: 120px 0;
    }

    /* Hero */
    .hero-section {
      padding-top: 140px;
      padding-bottom: 100px;
      background: var(--bg-warm);
    }
    .hero-title {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.15;
    }
    .hero-highlight {
      color: var(--accent-gold);
    }
    .hero-img {
      width: 100%;
      height: auto;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      animation: fadeInRight 0.8s ease-out;
    }
    @keyframes fadeInRight {
      0% { opacity: 0; transform: translateX(30px); }
      100% { opacity: 1; transform: translateX(0); }
    }

    /* 痛点卡片 */
    .pain-card {
      background: var(--card-white);
      border-radius: 12px;
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .pain-icon {
      font-size: 36px;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }

    /* 解决方案非对称 */
    .solution-img {
      border-radius: 16px;
      object-fit: cover;
      width: 100%;
      height: auto;
      aspect-ratio: 3/2;
      box-shadow: var(--shadow-sm);
    }

    /* 数据卡片 */
    .metric-number {
      font-family: var(--font-numbers);
      font-size: 56px;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.1;
    }

    /* 证言 */
    .testimonial-card {
      background: var(--card-white);
      border-radius: 16px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .avatar-placeholder {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: #e9e9e9;
      object-fit: cover;
    }

    /* FAQ手风琴 */
    .accordion-button-custom {
      background: transparent;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-dark);
      box-shadow: none;
      border: none;
      padding: 20px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-button-custom:not(.collapsed) {
      background: transparent;
      color: var(--primary-dark);
    }
    .accordion-button-custom::after {
      transition: transform 0.3s;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-dark);
      color: white;
      border-radius: 0;
    }

    /* 页脚 */
    .footer-custom {
      background: var(--primary-dark);
      color: #CCCCCC;
    }
    .footer-custom a {
      color: #CCCCCC;
      text-decoration: none;
    }
    .footer-custom a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 768px) {
      h1 { font-size: 38px; }
      h2 { font-size: 28px; }
      section { padding: 80px 0; }
      .hero-title { font-size: 42px; }
      .navbar-custom { padding: 12px 0; }
    }