/* roulang page: index */
/* Reset & Base Variables */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    :root {
      --primary-burgundy: #7B1E3F;
      --primary-burgundy-light: #9B2C4B;
      --accent-gold: #C8A96E;
      --accent-gold-light: #E0C78A;
      --dark-charcoal: #1A1A1D;
      --warm-ivory: #FAF8F5;
      --text-dark: #3A3A3C;
      --text-muted: #6B6B70;
      --text-light: #B0B0B5;
      --white: #FFFFFF;
      --border-light: #E5E0DA;
      
      --font-serif: "Noto Serif SC", "STSong", "Songti SC", "Times New Roman", serif;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-card-hover: 0 8px 30px rgba(123, 30, 63, 0.12);
      --shadow-gold-glow: 0 0 18px rgba(200, 169, 110, 0.5);
      
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-xl: 16px;
      
      --transition-smooth: 0.3s ease;
      --transition-bounce: 0.25s cubic-bezier(0.2, 0.9, 0.4, 1);
      
      --container-max: 1280px;
      --section-padding: 100px;
      --nav-height: 72px;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--nav-height);
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-ivory);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 500;
      transition: all var(--transition-smooth);
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      line-height: 1.3;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Navigation - Dark Neon Style */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background-color: var(--dark-charcoal);
      z-index: 1000;
      border-bottom: 2px solid transparent;
      background-image: linear-gradient(to right, var(--dark-charcoal), var(--dark-charcoal)), 
                        linear-gradient(to right, var(--accent-gold), transparent);
      background-origin: border-box;
      background-clip: padding-box, border-box;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 1px;
      white-space: nowrap;
      transition: text-shadow 0.3s;
    }
    .logo:hover {
      text-shadow: 0 0 8px rgba(200,169,110,0.6);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-light);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-gold);
      box-shadow: 0 0 8px var(--accent-gold);
    }

    .nav-cta {
      background: var(--accent-gold);
      color: var(--dark-charcoal);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    }
    .nav-cta:hover {
      background: var(--accent-gold-light);
      box-shadow: var(--shadow-gold-glow);
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 26px;
      height: 20px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
      z-index: 1001;
    }
    .menu-toggle span {
      width: 100%;
      height: 2px;
      background: var(--accent-gold);
      transition: all 0.3s;
    }
    .menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .menu-toggle.active span:nth-child(2) { opacity: 0; }
    .menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 0;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,29,0.85) 0%, rgba(123,30,63,0.6) 100%);
    }
    .hero-content {
      position: relative;
      max-width: 700px;
      padding: 40px 0;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      color: white;
      margin-bottom: 24px;
      line-height: 1.2;
    }
    .hero .subtitle {
      font-size: 18px;
      color: #D0D0D5;
      max-width: 500px;
      margin-bottom: 40px;
      line-height: 1.8;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-burgundy);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-burgundy-light);
      box-shadow: 0 0 18px rgba(200,169,110,0.4);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: rgba(200,169,110,0.1);
      border-color: var(--accent-gold-light);
      color: var(--accent-gold-light);
    }

    /* Sections general */
    section {
      padding: var(--section-padding) 0;
    }
    .section-title {
      font-size: 36px;
      color: var(--dark-charcoal);
      text-align: center;
      margin-bottom: 16px;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto 56px;
      font-size: 17px;
    }

    /* Services Grid */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-smooth);
      text-align: left;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(123,30,63,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      overflow: hidden;
    }
    .service-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
      color: var(--dark-charcoal);
    }
    .service-card p {
      color: var(--text-muted);
      font-size: 15px;
    }

    /* Advantages / Data */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-item .stat-number {
      font-family: var(--font-serif);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
      margin-bottom: 8px;
      line-height: 1.2;
    }
    .stat-divider {
      width: 40px;
      height: 2px;
      background: var(--accent-gold);
      margin: 12px auto;
    }
    .stat-label {
      font-size: 16px;
      color: var(--text-dark);
    }

    /* Cases */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      height: 220px;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-text {
      padding: 24px;
    }
    .case-text h4 {
      font-size: 20px;
      margin-bottom: 8px;
    }
    .case-text .result {
      color: var(--accent-gold);
      font-weight: 500;
      font-size: 14px;
    }

    /* Process */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .process-steps::before {
      content: '';
      position: absolute;
      top: 35px;
      left: 80px;
      right: 80px;
      height: 2px;
      background: repeating-linear-gradient(to right, var(--accent-gold) 0px, var(--accent-gold) 8px, transparent 8px, transparent 16px);
      z-index: 0;
    }
    .step {
      text-align: center;
      max-width: 200px;
      position: relative;
      z-index: 1;
    }
    .step-circle {
      width: 70px;
      height: 70px;
      background: var(--primary-burgundy);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-serif);
      font-size: 28px;
      font-weight: 700;
      margin: 0 auto 20px;
    }
    .step h4 {
      font-size: 20px;
      margin-bottom: 8px;
    }
    .step p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--warm-ivory);
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 4px;
    }
    .faq-question {
      width: 100%;
      padding: 24px 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: var(--font-serif);
      font-size: 18px;
      font-weight: 600;
      color: var(--dark-charcoal);
      background: transparent;
      text-align: left;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--accent-gold);
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: white;
      padding: 0 16px;
      color: var(--text-dark);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
      box-shadow: inset 0 2px 8px rgba(0,0,0,0.03);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA Block */
    .cta-block {
      background: var(--primary-burgundy);
      padding: 80px 0;
      text-align: center;
    }
    .cta-block h2 {
      font-size: 36px;
      color: white;
      margin-bottom: 16px;
    }
    .cta-block p {
      color: var(--accent-gold-light);
      font-size: 18px;
      margin-bottom: 32px;
    }
    .btn-gold {
      background: var(--accent-gold);
      color: var(--dark-charcoal);
      padding: 18px 40px;
      font-size: 16px;
      border-radius: var(--radius-sm);
      font-weight: 700;
    }
    .btn-gold:hover {
      background: var(--accent-gold-light);
      box-shadow: var(--shadow-gold-glow);
    }

    /* Footer */
    .footer {
      background: var(--dark-charcoal);
      color: var(--text-light);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-family: var(--font-serif);
      font-size: 20px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    .footer-desc {
      font-size: 13px;
      line-height: 1.7;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .footer ul {
      list-style: none;
    }
    .footer ul li {
      margin-bottom: 10px;
      font-size: 14px;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: var(--accent-gold);
      transition: 0.3s;
    }
    .copyright {
      text-align: center;
      font-size: 13px;
      border-top: 1px solid #2A2A2D;
      padding-top: 24px;
      color: #6B6B70;
    }

    @media (max-width: 1024px) {
      .services-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .process-steps { flex-wrap: wrap; gap: 30px; justify-content: center; }
      .process-steps::before { display: none; }
    }
    @media (max-width: 768px) {
      :root { --section-padding: 60px; }
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .mobile-menu.active { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; width: 100%; background: var(--dark-charcoal); padding: 20px; gap: 20px; }
      .hero h1 { font-size: 32px; }
      .services-grid, .cases-grid, .advantages-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }