/* roulang page: index */
:root {
      --primary: #E94E1B;
      --primary-hover: #D14418;
      --secondary: #2A2A2A;
      --bg: #F7F5F2;
      --accent: #C2D500;
      --text: #1C1C1C;
      --text-secondary: #5C5C5C;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 14px 40px rgba(0,0,0,0.10);
      --radius-card: 20px;
      --radius-btn: 30px;
      --radius-input: 12px;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3 {
      font-weight: 800;
      letter-spacing: -0.5px;
      font-family: 'Noto Sans SC', 'PingFang SC Heavy', sans-serif;
    }

    h1 { font-size: 48px; }
    h2 { font-size: 36px; }
    h3 { font-size: 22px; }

    p, li { color: var(--text-secondary); }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 16px;
      gap: 8px;
      background: transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: var(--white);
      box-shadow: inset 0 2px 4px rgba(255,255,255,0.1);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: scale(1.03);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: rgba(233,78,27,0.1);
      transform: scale(1.03);
    }

    .btn-white {
      background: var(--white);
      color: var(--primary);
      font-weight: 700;
    }
    .btn-white:hover {
      background: #f0f0f0;
      transform: scale(1.03);
    }

    /* Header / Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--white);
      height: 72px;
      display: flex;
      align-items: center;
      box-shadow: 0 1px 0 var(--border-light);
      transition: box-shadow 0.3s;
    }
    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-weight: 900;
      font-size: 26px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo i {
      font-size: 30px;
      color: var(--secondary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 600;
      color: var(--text);
      position: relative;
      padding: 8px 0;
      transition: color 0.3s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text);
    }

    /* Mobile menu */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      height: 100vh;
      background: rgba(42,42,42,0.95);
      backdrop-filter: blur(10px);
      z-index: 200;
      display: flex;
      flex-direction: column;
      padding: 80px 40px 40px;
      transition: right 0.4s ease;
      gap: 28px;
    }
    .mobile-menu.open {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 700;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }
    .menu-close {
      position: absolute;
      top: 20px;
      right: 24px;
      background: none;
      border: none;
      color: white;
      font-size: 32px;
    }

    /* Sections spacing */
    section {
      padding: 100px 0;
    }

    /* Hero */
    .hero {
      background: radial-gradient(circle at 85% 20%, rgba(233,78,27,0.15), transparent 70%);
      background-color: var(--bg);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 5;
    }
    .hero-right {
      flex: 7;
      position: relative;
    }
    .hero-badge-group {
      display: flex;
      gap: 24px;
      margin: 32px 0;
      flex-wrap: wrap;
    }
    .badge {
      background: var(--white);
      border: 1.5px solid var(--accent);
      border-radius: 16px;
      padding: 12px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .badge-number {
      font-family: 'Oswald', 'DIN Alternate', sans-serif;
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
    }
    .badge-label {
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 4px;
    }

    .hero-image-card {
      background: var(--white);
      border-radius: 32px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .hero-image-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .cta-floating {
      position: absolute;
      bottom: 30px;
      right: 30px;
    }

    /* Highlights grid */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .highlight-number {
      font-family: 'Oswald', sans-serif;
      font-size: 40px;
      color: var(--accent);
      transition: color 0.3s;
    }
    .highlight-card:hover .highlight-number {
      color: var(--primary);
    }

    /* Services waterfall */
    .services-waterfall {
      columns: 3;
      column-gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      margin-bottom: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      break-inside: avoid;
      display: inline-block;
      width: 100%;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      font-size: 36px;
      color: var(--primary);
      transition: transform 0.3s;
    }
    .service-card:hover .service-icon {
      transform: scale(1.2);
    }
    .service-tag {
      background: #f0f0f0;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-secondary);
      transition: 0.3s;
    }
    .service-card:hover .service-tag {
      background: var(--accent);
      color: #1C1C1C;
    }

    /* Comparison */
    .comparison-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      margin-top: 40px;
    }
    .plan-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-card);
      position: relative;
      transition: var(--transition);
    }
    .plan-card.recommended {
      border-left: 4px solid var(--primary);
      background: #FFF9F7;
    }
    .plan-badge {
      position: absolute;
      top: -14px;
      right: 24px;
      background: var(--primary);
      color: white;
      padding: 6px 20px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
    }
    .plan-features li {
      list-style: none;
      margin: 16px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* Cases waterfall */
    .cases-grid {
      columns: 2;
      column-gap: 24px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      break-inside: avoid;
    }
    .case-card:hover {
      transform: translateY(-4px);
    }
    .case-img-wrap {
      position: relative;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      transition: 0.5s;
    }
    .case-card:hover .case-img-wrap img {
      filter: brightness(0.9);
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(233,78,27,0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      font-size: 32px;
      color: white;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: 16px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      padding: 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.3s;
    }
    .faq-item.active .faq-question {
      border-left-color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 24px;
      display: none;
      background: #FAFAFA;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA Banner */
    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 80px 24px;
      color: white;
      border-radius: 0;
    }

    /* Footer */
    .site-footer {
      background: var(--secondary);
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 900;
      color: white;
    }
    .social-icons i {
      font-size: 24px;
      margin-right: 16px;
      transition: 0.3s;
      color: #aaa;
    }
    .social-icons i:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero .container { flex-direction: column; }
      .highlights-grid { grid-template-columns: repeat(2,1fr); }
      .services-waterfall { columns: 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      h2 { font-size: 30px; }
      .comparison-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cases-grid { columns: 1; }
      .services-waterfall { columns: 1; }
    }
    @media (max-width: 480px) {
      .highlights-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn { padding: 12px 24px; }
      h1 { font-size: 34px; }
    }