/* roulang page: index */
/* ----- CSS RESET & VARIABLES ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    :root {
      --primary-deep: #0A0F1F;
      --accent-red: #E94E3C;
      --accent-red-hover: #C83D2E;
      --bg-page: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-body: #475569;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-light: #E2E8F0;
      --border-input: #CBD5E1;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
      --shadow-card-hover: 0 12px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --transition-btn: 0.2s ease;
      --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --max-width: 1280px;
      --nav-height: 72px;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-btn);
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* ----- TYPOGRAPHY ----- */
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      line-height: 1.25;
      font-weight: 700;
      color: var(--primary-deep);
      position: relative;
      display: inline-block;
      margin-bottom: 1.5rem;
    }
    .section-title-wrapper {
      margin-bottom: 3rem;
    }
    .section-title-wrapper h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 3px;
      background-color: var(--accent-red);
      border-radius: 2px;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
      color: var(--primary-deep);
    }
    .text-body {
      color: var(--text-body);
      font-size: 16px;
      line-height: 1.7;
    }
    .text-small {
      font-size: 14px;
      line-height: 1.5;
      color: var(--text-muted);
    }
    /* ----- BUTTONS ----- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: var(--transition-btn);
      cursor: pointer;
      border: 2px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border: none;
    }
    .btn-primary:hover {
      background-color: var(--accent-red-hover);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    .btn-sm {
      padding: 10px 20px;
      font-size: 14px;
    }
    /* ----- NAVIGATION ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(248,250,252,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      display: inline-block;
      width: 8px;
      height: 18px;
      background: var(--accent-red);
      clip-path: polygon(0 0, 100% 50%, 0 100%);
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover {
      color: var(--accent-red);
    }
    .nav-links a.active {
      color: var(--accent-red);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-red);
    }
    .mobile-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .mobile-toggle span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      border-radius: 2px;
      transition: var(--transition);
    }
    /* ----- HERO ----- */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: var(--nav-height);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(248,250,252,0.7);
      backdrop-filter: blur(2px);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      width: 100%;
    }
    .hero-content {
      flex: 0 0 55%;
    }
    .hero-title {
      margin-bottom: 1.5rem;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-bottom: 2.5rem;
    }
    .hero-stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-red);
      line-height: 1.2;
    }
    .hero-stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    .hero-visual {
      flex: 0 0 40%;
      background: rgba(255,255,255,0.25);
      backdrop-filter: blur(4px);
      border-radius: 24px;
      padding: 24px;
      border: 1px solid rgba(233,78,60,0.15);
    }
    .hero-visual img {
      border-radius: 16px;
      object-fit: cover;
      width: 100%;
      height: auto;
    }
    /* ----- SECTIONS ----- */
    section {
      padding: 100px 0;
    }
    .bg-light-gray {
      background-color: #F1F5F9;
    }
    /* SOLUTION GRID */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .solution-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-left: 4px solid var(--accent-red);
      position: relative;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-left-width: 8px;
    }
    .solution-icon {
      width: 48px;
      height: 48px;
      color: var(--accent-red);
      margin-bottom: 20px;
    }
    .solution-card h3 {
      margin-bottom: 12px;
    }
    /* RESULTS */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .result-item {
      text-align: center;
    }
    .result-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--accent-red);
      line-height: 1.1;
    }
    .result-desc {
      color: var(--text-body);
      margin-top: 12px;
    }
    /* TESTIMONIALS */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-quote {
      font-size: 48px;
      color: var(--accent-red);
      opacity: 0.2;
      line-height: 1;
      margin-bottom: 12px;
    }
    .testimonial-text {
      font-style: italic;
      color: #1E293B;
      margin-bottom: 24px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: #E2E8F0;
      border-radius: 50%;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      padding: 24px 0;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-deep);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-icon {
      font-size: 24px;
      color: var(--accent-red);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #F8FAFC;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* CONTACT FORM */
    .contact-form {
      max-width: 480px;
      margin: 0 auto;
      background: var(--bg-white);
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .form-group {
      margin-bottom: 20px;
    }
    label {
      display: block;
      font-weight: 500;
      margin-bottom: 8px;
      color: var(--primary-deep);
    }
    input, textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-btn);
      background: white;
      transition: 0.2s;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent-red);
      box-shadow: 0 0 0 3px rgba(233,78,60,0.1);
    }
    /* FOOTER */
    .site-footer {
      background: var(--primary-deep);
      color: var(--text-light);
      padding: 60px 0 30px;
      border-top: 2px solid var(--accent-red);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 800;
      color: white;
    }
    .footer-desc {
      margin-top: 12px;
      color: #CBD5E1;
    }
    .footer-links a {
      display: block;
      color: #94A3B8;
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: white;
    }
    .copyright {
      border-top: 1px solid #334155;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }
    /* RESPONSIVE */
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-content {
        flex: auto;
      }
      .hero-stats {
        justify-content: center;
      }
      .grid-3, .testimonials-grid {
        grid-template-columns: 1fr 1fr;
      }
      .results-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 34px; }
      h2 { font-size: 28px; }
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: rgba(248,250,252,0.98);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-toggle {
        display: flex;
      }
      .grid-3, .testimonials-grid, .results-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }