/* roulang page: index */
:root {
      --primary-charcoal: #1E1E24;
      --accent-emerald: #0D9488;
      --accent-amber: #F59E0B;
      --bg-warmwhite: #F5F3EF;
      --card-white: #FFFFFF;
      --text-heading: #111827;
      --text-body: #374151;
      --text-light: #F9FAFB;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-nav: 16px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
      --shadow-nav: 0 2px 24px rgba(0,0,0,0.08);
      --shadow-btn: 0 6px 20px rgba(13,148,136,0.3);
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warmwhite);
      color: var(--text-body);
      margin: 0;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-heading);
    }
    a {
      color: var(--accent-emerald);
      transition: all 0.25s ease;
      text-decoration: none;
    }
    a:hover {
      text-decoration: underline;
      color: var(--accent-amber);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 浮动导航栏 */
    .floating-nav {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 2rem);
      max-width: 1100px;
      background: rgba(245, 243, 239, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: var(--shadow-nav);
      border-radius: var(--radius-nav);
      padding: 0.5rem 1.5rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      transition: all 0.3s ease;
    }
    .nav-logo {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--accent-emerald);
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      gap: 1.5rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu a {
      color: var(--text-body);
      font-weight: 500;
      text-decoration: none;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-menu a:hover {
      color: var(--accent-emerald);
      text-decoration: none;
    }
    .nav-menu a.active {
      color: var(--accent-emerald);
      border-bottom: 2px solid var(--accent-emerald);
    }
    .nav-cta {
      background: var(--accent-emerald);
      color: white;
      padding: 0.65rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: #0F766E;
      box-shadow: var(--shadow-btn);
      color: white;
      text-decoration: none;
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      font-size: 1.5rem;
      color: var(--text-heading);
      background: none;
      border: none;
      cursor: pointer;
    }
    /* Hero */
    #hero {
      padding: clamp(6rem, 15vh, 10rem) 0 2rem;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      background-blend-mode: overlay;
      background-color: rgba(30,30,36,0.7);
      color: var(--text-light);
    }
    .hero-content {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 2.5rem;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      color: white;
      font-size: clamp(2rem, 5vw, 3.5rem);
      line-height: 1.15;
      margin-bottom: 1rem;
    }
    .hero-content p {
      font-size: 1.125rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-emerald);
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #0F766E;
      box-shadow: var(--shadow-btn);
      transform: translateY(-2px);
      color: white;
      text-decoration: none;
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent-emerald);
      color: var(--accent-emerald);
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .btn-secondary:hover {
      background: var(--accent-emerald);
      color: white;
      text-decoration: none;
    }
    .metrics-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 1.5rem;
      max-width: 1000px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
      padding-bottom: 2rem;
    }
    .metric-card {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      padding: 1.5rem 1.2rem;
      flex: 1 1 200px;
      text-align: center;
      color: white;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 700;
      color: var(--accent-amber);
      line-height: 1.1;
    }
    .metric-label {
      color: rgba(255,255,255,0.8);
      font-size: 0.875rem;
    }
    /* Sections */
    section {
      padding: clamp(3rem, 8vh, 6rem) 0;
    }
    .section-title {
      text-align: center;
      font-size: clamp(1.5rem, 3vw, 2.25rem);
      margin-bottom: 0.5rem;
    }
    .title-divider {
      width: 60px;
      height: 3px;
      background: var(--accent-emerald);
      margin: 0.5rem auto 2.5rem;
      border-radius: 2px;
    }
    /* Features */
    .features-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
      justify-content: center;
    }
    .feature-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 1.8rem 1.5rem;
      box-shadow: var(--shadow-card);
      flex: 1 1 220px;
      text-align: center;
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
      border-color: var(--accent-emerald);
    }
    .feature-icon {
      width: 48px;
      height: 48px;
      background: #E6FFFA;
      border-radius: 50%;
      margin: 0 auto 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-emerald);
      font-size: 1.5rem;
    }
    .feature-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-emerald);
    }
    /* Services */
    .services-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      flex: 1 1 300px;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    }
    .service-img {
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .service-card:hover .service-img {
      transform: scale(1.03);
    }
    .service-body {
      padding: 1.5rem;
      flex: 1;
    }
    .service-list {
      list-style: none;
      margin: 1rem 0 0;
      padding: 0;
      font-size: 0.875rem;
    }
    .service-list li::before {
      content: "●";
      color: var(--accent-emerald);
      margin-right: 0.5rem;
    }
    /* Results */
    .comparison-wrapper {
      display: flex;
      gap: 2rem;
      align-items: stretch;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1 1 280px;
      border-radius: var(--radius-card);
      padding: 2rem;
    }
    .pain-col {
      background: #FEF2F2;
      border: 1px solid #FECACA;
    }
    .gain-col {
      background: #ECFDF5;
      border: 1px solid #A7F3D0;
    }
    .compare-list {
      list-style: none;
      padding: 0;
      margin: 1rem 0 0;
    }
    .compare-list li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .increase-bar {
      background: var(--accent-amber);
      color: #1E1E24;
      font-weight: 700;
      padding: 1rem;
      border-radius: var(--radius-card);
      text-align: center;
      margin-top: 2rem;
      font-size: 1.25rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      margin-bottom: 0.8rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1rem 1.5rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-heading);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F9FAFB;
      padding: 0 1.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1rem 1.5rem;
    }
    .faq-item.active .faq-question {
      border-bottom: 2px solid var(--accent-emerald);
      color: var(--accent-emerald);
    }
    /* Contact */
    .contact-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
      background: linear-gradient(180deg, #F0FDFA 0%, #FFFFFF 100%);
      border-radius: var(--radius-card);
      padding: 2rem;
    }
    .contact-form {
      flex: 2 1 300px;
    }
    .contact-info {
      flex: 1 1 250px;
    }
    input, textarea {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid #D1D5DB;
      border-radius: var(--radius-input);
      margin-bottom: 1rem;
      font-family: inherit;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent-emerald);
      box-shadow: 0 0 0 3px rgba(13,148,136,0.2);
    }
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-top: 1rem;
    }
    /* Footer */
    .footer {
      background: var(--primary-charcoal);
      color: #D1D5DB;
      padding: 3rem 0 1.5rem;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      justify-content: space-between;
    }
    .footer-col {
      flex: 1 1 180px;
    }
    .footer-bottom {
      border-top: 1px solid #374151;
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.875rem;
    }
    @media (max-width: 1024px) {
      .nav-menu {
        gap: 1rem;
      }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(245,243,239,0.98);
        flex-direction: column;
        padding: 1rem;
        border-radius: 12px;
      }
      .nav-menu.show {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .metrics-grid {
        flex-wrap: wrap;
      }
      .comparison-wrapper {
        flex-direction: column;
      }
    }