:root {
  --primary1: #f97316;
  --primary2: #196abb;
  --primary: #2563eb;
  /* #ff5a2c */
  --dark: #1f2933;
  --gray: #6b7280;
  --bg: #f9fafb;
  --white: #ffffff;
  --blue: #2563eb;
  --bg_footer: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
}

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background: var(--bg);
      color: var(--dark);
      line-height: 1.6;
    }

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

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

    /* ====== HEADER ====== */

    header {
      width: 100%;
      background-color: #ffffff;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
      position: sticky;
      top: 0;
      z-index: 1000;
    }

    .nav {
      max-width: 1200px;
      margin: 0 auto;
      padding: 24px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo img {
      height: 100px;
      width: auto;
      display: block;
    }
    .menu-call {
        color: var(--primary);
        font-weight: 600;
        padding: 6px 12px;
        border: 1px solid var(--primary);
        border-radius: 6px;
        transition: .2s;
    }

    /* ====== 1. STYLE MENU DESKTOP (PC > 992px) ====== */
    .desktop-menu {
      display: flex;
      align-items: center;
      gap: 25px;
    }

    /* Ẩn các phần tử Mobile trên PC */
    .menu-toggle,
    .mobile-menu,
    .menu-overlay {
      display: none;
    }

    .desktop-menu a {
      position: relative; 
      text-decoration: none;
      color: #334155;
      font-weight: 600;
      font-size: 0.95rem;
      transition: color 0.3s ease;
    }

    .desktop-menu a:not(.menu-call)::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 0;
      height: 2px;
      background: var(--primary, #2563eb);
      transition: width 0.3s ease;
    }

    /* Trượt thanh gạch chân ra 100% khi Hover */
    .desktop-menu a:not(.menu-call):hover::after {
      width: 100%;
    }

    .menu-call {
      color: var(--primary);
      font-weight: 600;
      padding: 6px 12px;
      border: 1px solid var(--primary);
      border-radius: 6px;
      transition: .2s;
    }

    .menu-call:hover {
      background: var(--primary);
      color: #fff;
    }

    .desktop-menu .lang-switch {
      border: 1px solid #ddd;
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 0.95rem;
    
    }
    .desktop-menu .lang-switch:hover{
      color: var(--primary)

    }
    .container{
        max-width: 900px;
         padding: 40px 20px;
          margin: 0 auto;
    }
 

    /* ====== HERO ====== */
    .hero {
      background: 
       linear-gradient(rgba(0,0,0,0.35), rgba(0,0,0,0.35)),
      /* linear-gradient(rgba(0,0,0,.55), rgba(0,0,0,.55)), */
        /* url('https://images.unsplash.com/photo-1537432376769-00aabc7f9e6c'); */
        url('./images/background/banner_2.png');
      background-size: cover;
      background-position: center;
      color: #fff;
    }

    .hero-content {
      max-width: 1200px;
      margin: auto;
      padding: 100px 16px;
    }

    .hero h1 {
      font-size: clamp(32px, 5vw, 48px);
      max-width: 700px;
    }

    .hero p {
      margin: 16px 0 32px;
      max-width: 600px;
      color: #e5e7eb;
    }

    .btn {
      display: inline-block;
      background: var(--primary);
      color: #fff;
      padding: 12px 24px;
      border-radius: 6px;
      font-weight: 600;
    }

    /* ====== INTRO ====== */
    .section {
      max-width: 1200px;
      margin: auto;
      padding: 64px 16px;
    }

    .section-title {
      text-align: center;
      margin-bottom: 40px;
    }

    .section-title h2 {
      font-size: 32px;
    }

    .intro {
      max-width: 900px;
      margin: auto;
      text-align: center;
      color: var(--gray);
    }

    /* ====== CONTACT BLOCK ====== */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: stretch;
    }

    .contact-image {
      border-radius: 12px;
      overflow: hidden;
    }

    .contact-box {
      background: var(--white);
      padding: 32px;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    }

    .contact-box h3 {
      margin-bottom: 20px;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 12px;
      border: 1px solid #ddd;
      border-radius: 6px;
    }
    .form-group label {
        display: block;
        margin-bottom: 6px;
        font-weight: 500;
      }

      .required {
        color: red;
        margin-left: 4px;
      }


    .captcha {
      display: flex;
      gap: 12px;
      align-items: center;
    }

    .captcha span {
      background: #f3f4f6;
      padding: 10px 16px;
      font-weight: bold;
      letter-spacing: 2px;
      border-radius: 6px;
    }

    button {
      border: none;
      cursor: pointer;
    }

    /* ====== FOOTER ====== */
    /* footer {
      background: #111827;
      color: #9ca3af;
      text-align: center;
      padding: 24px 16px;
    } */
    .footer {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 14px 40px;   
        flex-wrap: wrap;       /* mỏng – gọn */
        background: var(--bg_footer);         /* dark tech */
        color: var(--white);
        font-size: 16px;
    }

    .footer-left {
      display: flex;
      gap: 24px;
    }

    .footer-left span {
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }

    .footer-right {
      display: flex;
      gap: 14px;
    }

    .footer-right a {
      color: #cbd5e1;
      font-size: 16px;
      transition: color 0.2s ease, transform 0.2s ease;
    }

    .footer-right a:hover {
      color: #38bdf8;              /* xanh tech */
      transform: translateY(-2px);
    }
    .footer-bottom {
      margin-top: 10px;
      padding-top: 10px;
      /* border-top: 1px solid rgba(255,255,255,0.1); */
      font-size: 14px;
      text-align: center;
      opacity: 0.6;
    }
     .footer-links {
    margin-bottom: 8px;
    }

    .footer-links a {
        color: inherit;
        text-decoration: none;
    }

    .footer-links a:hover {
        text-decoration: underline;
    }
    .powered-by {
      display: block;
      margin-top: 8px;
      font-size: 12px;
      color: rgb(165, 165, 165);
      letter-spacing: 0.5px;
    }

    .footer .powered-by strong {
        color: rgb(255,255,255); 
        font-weight: 600;
    }
    .g-recaptcha {
          transform-origin: left top;
          -webkit-transform-origin: left top;
    }
    /* ====== RESPONSIVE ====== */
    @media(max-width: 1024px){
        .footer {
            flex-direction: column;
            align-items: center;
            gap: 8px;
            text-align: center;
            padding: 24px 16px;
        }
    }
    @media (max-width: 900px) {
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
		
	   .menu-toggle {
			display: block;
		}
		/* .menu {
			position: fixed;
			top: 100%;
			right: 16px;
			background: #fff;
			flex-direction: column;
			gap: 16px;
			padding: 16px;
			border-radius: 8px;
			box-shadow: 0 10px 30px rgba(0,0,0,.1);
			display: none;
		} */

		/* .menu.active {
			display: flex;
			right: 0;
		} */
		.menu {
			position: fixed;
			top: 70px;
			right: -100%;
			width: 100%;
			max-width: 280px;
			height: calc(100vh - 64px);
			background: #fff;
			flex-direction: column;
			align-items: flex-start;
			padding: 24px;
			gap: 16px;
			box-shadow: -4px 0 20px rgba(0,0,0,.08);
			transition: right .3s ease;
		}

		.menu.active {
			right: 0;
		}

		.menu a,
		.lang-switch {
			width: 100%;
		}

		.menu-call {
			margin-top: 12px;
			width: 100%;
			text-align: center;
		}
        .footer{
            gap: 4px;
        }

		.footer-left {
			flex-wrap: wrap;
			justify-content: center;
		}
    }