/* roulang page: index */
:root {
      --charcoal: #1A1A1A;
      --electric-orange: #FF4C00;
      --warm-ivory: #F9F7F4;
      --soft-gray: #5C5C5C;
      --cool-white: #FFFFFF;
      --border-light: #E5E5E5;
      --transition-speed: 0.25s;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--warm-ivory);
      color: var(--charcoal);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      scroll-behavior: smooth;
    }
    .text-balance {
      text-wrap: balance;
    }
    .letter-spacing-tight {
      letter-spacing: -0.02em;
    }
    .section-padding {
      padding-top: 6.25rem;
      padding-bottom: 6.25rem;
    }
    @media (max-width: 767px) {
      .section-padding {
        padding-top: 4rem;
        padding-bottom: 4rem;
      }
    }
    .container-main {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 480px) {
      .container-main {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    h1, h2, h3, h4 {
      letter-spacing: -0.02em;
      color: var(--charcoal);
    }
    .text-sub {
      color: var(--soft-gray);
    }
    .bg-warm-ivory {
      background-color: var(--warm-ivory);
    }
    .bg-electric-orange {
      background-color: var(--electric-orange);
    }
    .text-electric-orange {
      color: var(--electric-orange);
    }
    .border-electric-orange {
      border-color: var(--electric-orange);
    }
    .hero-score-anim {
      animation: pulseScore 2s infinite ease-in-out;
    }
    @keyframes pulseScore {
      0% { opacity: 0.9; transform: translateY(0px); }
      50% { opacity: 0.7; transform: translateY(-3px); }
      100% { opacity: 0.9; transform: translateY(0px); }
    }
    .nav-link {
      position: relative;
      color: var(--soft-gray);
      transition: color 0.25s ease;
      font-size: 0.9375rem;
      margin: 0 1rem;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--charcoal);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--electric-orange);
      transition: width 0.2s ease;
    }
    .hamburger-middle {
      transition: all 0.25s ease;
    }
    .open .hamburger-middle {
      opacity: 0;
      transform: scaleX(0);
    }
    .card-service {
      background: #FFFFFF;
      border-radius: 12px;
      padding: 24px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      display: flex;
      align-items: flex-start;
      gap: 20px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-service:hover {
      transform: translateY(-3px);
      box-shadow: 0 6px 24px rgba(0,0,0,0.08);
    }
    .case-card-img {
      transition: transform 0.25s ease;
    }
    .case-card:hover .case-card-img {
      transform: scale(1.02);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1rem 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 500;
      font-size: 1.125rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--soft-gray);
      font-size: 1rem;
      line-height: 1.7;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 16px;
      padding-bottom: 8px;
    }
    .plus-icon {
      transition: transform 0.3s ease;
      font-size: 1.5rem;
      color: var(--soft-gray);
    }
    .faq-item.open .plus-icon {
      transform: rotate(45deg);
    }
    .count-up {
      font-variant-numeric: tabular-nums;
    }
    @media (max-width: 768px) {
      .nav-menu-desktop {
        display: none;
      }
      .hamburger-btn {
        display: flex;
      }
    }
    @media (min-width: 769px) {
      .hamburger-btn {
        display: none;
      }
      .mobile-drawer {
        display: none;
      }
    }
    .mobile-drawer {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 4px 12px rgba(0,0,0,0.05);
      z-index: 49;
      transform: translateY(-100%);
      opacity: 0;
      transition: transform 0.3s ease, opacity 0.3s ease;
      display: flex;
      flex-direction: column;
      padding: 24px;
      gap: 20px;
    }
    .mobile-drawer.open {
      transform: translateY(0);
      opacity: 1;
    }