/* roulang page: index */
:root {
      --primary: #0B3D3A;
      --primary-dark: #062726;
      --primary-light: rgba(11, 61, 58, 0.05);
      --accent: #C9A96E;
      --accent-hover: #b8924f;
      --danger: #C1666B;
      --bg: #F9F8F6;
      --card-bg: #FFFFFF;
      --text: #2C2C2C;
      --text-light: #5A5A5A;
      --border: #E8E5DF;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
      --font-number: "Inter", "Segoe UI", sans-serif;
      --transition: 0.25s cubic-bezier(0.33, 1, 0.68, 1);
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      color: inherit;
      text-decoration: none;
    }

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

    button, input {
      font-family: inherit;
      border: none;
      background: none;
      cursor: pointer;
    }

    h1, h2, h3 {
      color: var(--text);
    }

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

    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h3 {
      font-size: 24px;
      line-height: 1.4;
      font-weight: 600;
    }

    .number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 40px;
      line-height: 1.2;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.05);
      box-shadow: var(--shadow-md);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
    }

    .btn-outline:hover {
      background: var(--primary-light);
      transform: scale(1.05);
    }

    .btn-accent {
      background: var(--accent);
      color: #1a1a1a;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }

    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }

    .btn-cta {
      background: var(--primary);
      color: white;
      font-size: 18px;
      padding: 18px 48px;
      border-radius: var(--radius-sm);
      position: relative;
      overflow: hidden;
    }

    .btn-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 0 0 8px rgba(11,61,58,0.15);
    }

    .btn-cta::after {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(255,255,255,0.2);
      border-radius: inherit;
      opacity: 0;
      transform: scale(0.5);
      transition: 0.4s ease;
    }

    .btn-cta:active::after {
      opacity: 1;
      transform: scale(2);
      transition: 0s;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .section-padding {
      padding: 100px 0;
    }

    .bg-muted {
      background: var(--primary-light);
    }

    .fade-in-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .fade-in-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 16px;
      z-index: 50;
      margin: 16px auto 0;
      max-width: 1248px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      font-size: 1.8rem;
    }

    .nav-menu {
      display: flex;
      gap: 8px;
      list-style: none;
    }

    .nav-item a {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      background: transparent;
      transition: var(--transition);
      font-weight: 500;
      color: var(--text);
      white-space: nowrap;
    }

    .nav-item a:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 1024px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 80px;
        left: 16px;
        right: 16px;
        background: white;
        flex-direction: column;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
        padding: 16px;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .navbar .btn-accent {
        display: none;
      }
      .navbar .btn-accent.mobile-visible {
        display: inline-flex;
        margin-top: 12px;
        width: 100%;
      }
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-image {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      h3 { font-size: 20px; }
      .number { font-size: 32px; }
      .section-padding { padding: 60px 0; }
      .hero-grid { grid-template-columns: 1fr; }
      .navbar { margin: 8px; padding: 8px 16px; }
    }

    /* 网格 */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

    @media (max-width: 1024px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    }

    .alt-row {
      display: flex;
      align-items: center;
      gap: 32px;
      margin-bottom: 40px;
    }
    .alt-row.reverse {
      flex-direction: row-reverse;
    }
    .alt-row img {
      width: 48%;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }
    .alt-text {
      flex: 1;
    }
    @media (max-width: 768px) {
      .alt-row, .alt-row.reverse { flex-direction: column; }
      .alt-row img { width: 100%; }
    }

    .pain-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      padding: 24px;
      border-left: 4px solid var(--primary);
      transition: var(--transition);
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }
    .pain-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .testimonial-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
    .quote-icon { font-size: 48px; color: var(--accent); line-height: 1; }

    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 16px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: background 0.2s;
    }
    .faq-question:hover { background: #f5f5f5; }
    .faq-item.active .faq-question { border-left-color: var(--primary); }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: var(--text-light);
    }
    .faq-item.active .faq-answer { max-height: 200px; padding-bottom: 16px; }
    .faq-arrow { transition: transform 0.3s; color: var(--accent); }
    .faq-item.active .faq-arrow { transform: rotate(180deg); }

    .footer {
      background: #0B2C29;
      color: #B0B8B6;
      padding: 60px 0 20px;
      margin-top: 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer a:hover { color: var(--accent); }
    .copyright {
      background: #061C1A;
      text-align: center;
      font-size: 13px;
      padding: 12px;
      margin-top: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }