/* roulang page: index */
:root {
      --deep-green: #0B1E1A;
      --card-bg: #1A3C34;
      --amber: #F5A623;
      --amber-hover: #D4891E;
      --teal: #00B4A6;
      --warm-gray: #F2F0EB;
      --alert-red: #D93B3B;
      --text-light: #B7C9C5;
      --text-dark: #1E2D2B;
      --text-muted: #5F6C6A;
      --white: #FFFFFF;
      --border-light: #E0E0E0;
      --border-focus: #D0D0D0;
      --font-mono: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --radius-card: 12px;
      --radius-btn: 6px;
      --radius-input: 6px;
      --radius-pill: 20px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.25);
      --transition: 0.25s ease;
      --bs-primary: var(--amber);
      --bs-secondary: var(--teal);
      --bs-body-bg: var(--white);
      --bs-body-color: var(--text-dark);
      --bs-border-radius: 8px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }
    a:hover {
      color: var(--amber);
    }

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

    button, input, textarea {
      font-family: inherit;
    }

    .btn {
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background-color 0.25s, color 0.25s, border-color 0.25s, transform 0.2s;
    }
    .btn:focus-visible {
      outline: 2px solid var(--amber);
      outline-offset: 2px;
    }

    .btn-primary {
      background-color: var(--amber);
      border-color: var(--amber);
      color: var(--white);
    }
    .btn-primary:hover {
      background-color: var(--amber-hover);
      border-color: var(--amber-hover);
      color: var(--white);
    }
    .btn-outline-light:hover {
      background-color: var(--white);
      color: var(--deep-green);
      border-color: var(--white);
    }

    .card {
      border-radius: var(--radius-card);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .form-control:focus {
      border-color: var(--amber);
      box-shadow: 0 0 0 2px rgba(245,166,35,0.25);
    }

    .accordion-button:not(.collapsed) {
      background-color: var(--card-bg);
      color: var(--white);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--amber);
    }

    .navbar {
      background-color: var(--white);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      border-bottom: 1px solid #E5E5E5;
      padding: 0.8rem 0;
    }
    .navbar-brand {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--deep-green);
      white-space: nowrap;
    }
    .navbar-brand span {
      color: var(--amber);
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: #3A3A3A;
      margin: 0 0.3rem;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--amber);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--amber);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .nav-link:hover::after {
      width: 100%;
      left: 0;
    }
    .search-box {
      background: #F5F5F5;
      border-radius: var(--radius-pill);
      border: 1px solid transparent;
      padding: 0.4rem 1rem;
      font-size: 0.9rem;
      width: 160px;
      transition: border 0.2s;
    }
    .search-box:focus {
      border-color: var(--amber);
      outline: none;
      box-shadow: none;
    }

    @keyframes float {
      0% { transform: translateY(0px); opacity: 0.1; }
      50% { transform: translateY(-12px); opacity: 0.25; }
      100% { transform: translateY(0px); opacity: 0.1; }
    }
    .hero-section {
      position: relative;
      min-height: 85vh;
      background: radial-gradient(ellipse at 30% 40%, #1A3C34 0%, #0B1E1A 70%, #000 100%);
      display: flex;
      align-items: center;
      overflow: hidden;
    }
    .hero-bg-numbers span {
      position: absolute;
      font-family: var(--font-mono);
      color: var(--amber);
      opacity: 0.1;
      font-size: 1.2rem;
      animation: float 5s infinite;
      pointer-events: none;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: var(--white);
    }
    .hero-decor {
      position: relative;
      z-index: 2;
    }
    .hero-decor-circle {
      width: 280px;
      height: 280px;
      border: 3px solid rgba(245,166,35,0.3);
      border-radius: 50%;
      position: absolute;
      right: -40px;
      top: 20px;
      animation: spin 20s linear infinite;
    }
    @keyframes spin {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }

    .section-padding {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 2.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 40px;
      height: 3px;
      background: var(--amber);
    }
    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

    .metric-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 1.8rem 1.2rem;
      color: var(--white);
      border: none;
      box-shadow: var(--shadow-sm);
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--amber);
      line-height: 1;
    }
    .trend-up {
      color: var(--teal);
      margin-left: 0.5rem;
    }
    .trend-down {
      color: var(--alert-red);
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      border-left: 4px solid var(--amber);
      padding: 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-left-width: 8px;
    }
    .service-icon {
      color: var(--teal);
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    .compare-before {
      background: #2C2C2C;
      border-radius: var(--radius-card);
      padding: 2rem;
      color: #aaa;
    }
    .compare-after {
      background: #1A3C34;
      border: 2px solid var(--amber);
      border-radius: var(--radius-card);
      padding: 2rem;
      color: var(--white);
    }

    .faq-section {
      background-color: var(--deep-green);
    }
    .accordion-custom .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 0.8rem;
    }
    .accordion-custom .accordion-button {
      background: var(--card-bg);
      color: var(--white);
      font-weight: 600;
      border-radius: var(--radius-btn) !important;
      padding: 1rem 1.5rem;
    }
    .accordion-custom .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    .accordion-custom .accordion-body {
      background: #0F2722;
      color: var(--text-light);
      border-radius: 0 0 var(--radius-btn) var(--radius-btn);
    }

    .cta-form-box {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
      border-left: 6px solid var(--amber);
    }

    .footer-section {
      background: var(--deep-green);
      color: var(--text-light);
    }
    .footer-link {
      color: var(--text-light);
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--amber);
    }

    @media (max-width: 767.98px) {
      .hero-title {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.5rem;
      }
      .section-padding {
        padding: 3rem 0;
      }
      .metric-number {
        font-size: 2rem;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
      }
    }