/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-red: #FF4655;
      --highlight-cyan: #00E5FF;
      --white: #FFFFFF;
      --light-gray: #F4F5F9;
      --text-dark: #1A1A2E;
      --text-secondary: #5A5A72;
      --border-light: #E5E5E5;
      --border-card: #e0e0e0;
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: all 0.2s ease;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-data: 'Rajdhani', 'Inter', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      background-color: var(--white);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-top: 0;
    }
    
    h1 {
      font-size: 3.2rem; 
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    
    h2 {
      font-size: 2.2rem;
      font-weight: 600;
    }
    
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    
    a {
      color: var(--highlight-cyan);
      text-decoration: none;
      transition: var(--transition);
    }
    
    a:hover {
      color: var(--accent-red);
      text-decoration: none;
    }
    
    .button {
      font-family: var(--font-sans);
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      line-height: 1.3;
    }
    
    .primary-btn {
      background-color: var(--accent-red);
      color: white !important;
      border: 2px solid var(--accent-red);
    }
    
    .primary-btn:hover {
      background-color: #E03340;
      border-color: #E03340;
      box-shadow: 0 0 14px rgba(255,70,85,0.45);
      transform: scale(1.02);
      color: white;
    }
    
    .secondary-btn {
      background: transparent;
      color: var(--accent-red) !important;
      border: 2px solid var(--accent-red);
    }
    
    .secondary-btn:hover {
      background: var(--accent-red);
      color: white !important;
    }
    
    .text-link {
      color: var(--highlight-cyan);
      font-weight: 500;
      border-bottom: 1px solid var(--highlight-cyan);
      transition: var(--transition);
    }
    
    .text-link:hover {
      color: var(--accent-red);
      border-bottom-color: var(--accent-red);
    }
    
    /* Navigation */
    .site-header {
      background: white;
      border-bottom: 1px solid #f0f0f0;
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 0.9rem 0;
    }
    
    .logo-text {
      font-weight: 700;
      font-size: 1.8rem;
      letter-spacing: 1px;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
    }
    .logo-text span {
      color: var(--accent-red);
      margin-left: 4px;
    }
    .logo-decor {
      display: inline-block;
      width: 6px;
      height: 24px;
      background: var(--accent-red);
      margin-right: 10px;
      transform: skewX(-12deg);
    }
    
    .nav-links a {
      color: var(--text-dark);
      font-weight: 500;
      margin: 0 1.2rem;
      position: relative;
      padding-bottom: 4px;
      font-size: 0.95rem;
      text-decoration: none;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-red);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 50%;
      transform: translateX(-50%);
      width: 6px;
      height: 6px;
      background: var(--accent-red);
      border-radius: 50%;
      opacity: 0;
      transition: 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      opacity: 1;
    }
    
    .nav-cta {
      background: var(--accent-red);
      color: white !important;
      padding: 8px 20px !important;
      border-radius: 4px;
      font-weight: 600;
      margin-left: 10px;
      text-decoration: none;
      font-size: 0.9rem;
    }
    .nav-cta:hover {
      background: #E03340;
      color: white;
    }
    
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #0A0E27 0%, #141B3A 100%);
      position: relative;
      overflow: hidden;
      color: white;
      padding: 6rem 0;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 48%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.55;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.8) 60%, transparent 100%);
      -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.8) 60%, transparent 100%);
    }
    .pulse-glow {
      position: absolute;
      right: 10%;
      top: 30%;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(0,229,255,0.15) 0%, transparent 70%);
      border-radius: 50%;
      animation: pulse 5s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(1); opacity: 0.4; }
      50% { transform: scale(1.15); opacity: 0.7; }
      100% { transform: scale(1); opacity: 0.4; }
    }
    
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
    }
    .hero-title strong {
      color: var(--accent-red);
    }
    .hero-sub {
      color: rgba(255,255,255,0.75);
      font-size: 1.25rem;
      max-width: 500px;
      margin: 1.5rem 0 2rem;
    }
    
    /* sections */
    section {
      padding: 5rem 0;
    }
    .section-head {
      margin-bottom: 3rem;
    }
    .bg-light {
      background-color: var(--light-gray);
    }
    .bg-dark {
      background-color: var(--primary-deep);
      color: white;
    }
    
    /* Cards */
    .feature-card {
      background: white;
      padding: 2rem 1.5rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-card);
      transition: all 0.25s;
      text-align: center;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      border-bottom: 3px solid var(--accent-red);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.5rem;
      color: var(--highlight-cyan);
      margin-bottom: 1rem;
      transition: 0.2s;
    }
    .feature-card:hover .feature-icon {
      color: var(--accent-red);
      transform: scale(1.1);
    }
    
    .service-card {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      background: white;
      border: 1px solid var(--border-card);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      margin-bottom: 1.5rem;
      transition: all 0.25s;
    }
    .service-card:hover {
      border-color: var(--accent-red);
      box-shadow: var(--shadow-sm);
    }
    .service-img {
      width: 100px;
      height: 80px;
      object-fit: cover;
      border-radius: 6px;
      flex-shrink: 0;
    }
    
    .stat-number {
      font-family: var(--font-data);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--highlight-cyan);
      line-height: 1;
    }
    
    .accordion-title {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-dark);
      border-bottom: 1px solid #eaeaea;
      padding: 1rem 0;
      position: relative;
      cursor: pointer;
      background: none;
      text-align: left;
      width: 100%;
      border-left: none;
      border-right: none;
      border-top: none;
    }
    .accordion-title::before {
      content: '+';
      position: absolute;
      right: 10px;
      font-weight: 400;
      color: var(--accent-red);
      font-size: 1.4rem;
    }
    .accordion-title[aria-expanded="true"]::before {
      content: '−';
    }
    .accordion-content {
      padding: 0.8rem 0;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    
    footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 3rem 0 1.5rem;
    }
    .footer-links a {
      color: rgba(255,255,255,0.75);
      font-size: 0.9rem;
      display: block;
      margin-bottom: 0.4rem;
    }
    .footer-links a:hover {
      color: var(--highlight-cyan);
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 1rem;
      color: rgba(255,255,255,0.7);
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent-red);
    }
    
    @media (max-width: 1024px) {
      h1 { font-size: 2.5rem; }
      .hero-bg-img { width: 40%; }
    }
    @media (max-width: 640px) {
      .hero-bg-img { display: none; }
      .hero-title { font-size: 2rem; }
      .service-card { flex-direction: column; align-items: flex-start; }
      .stat-number { font-size: 2.4rem; }
      .nav-links { background: white; }
    }