// Top nav — Logo on top, menu below, HRD logo at bottom
function Nav({ t }) {
  const [scrolled, setScrolled] = React.useState(false);
  const [mobileOpen, setMobileOpen] = React.useState(false);
  const [trainingOpen, setTrainingOpen] = React.useState(false);
  const [consultancyOpen, setConsultancyOpen] = React.useState(false);
  const [mobileTrainingOpen, setMobileTrainingOpen] = React.useState(false);
  const [mobileConsultancyOpen, setMobileConsultancyOpen] = React.useState(false);

  const trainingItems = [
    { label: "EHS Training", href: "training.html#ehs-trainings" },
    { label: "Engineering & Technical Training", href: "training.html#engineering-trainings" },
    { label: "Root Cause Analysis (RCA) Training", href: "training.html#rca-trainings" },
    { label: "Integrated Training", href: "training.html#integrated-trainings" },
    { label: "Process Safety Programs", href: "training.html#process-safety-trainings" },
    { label: "Lean Manufacturing Program", href: "training.html#lean-manufacturing-trainings" },
    { label: "Psychology & Behaviour Based Safety", href: "training.html#psychology-trainings" },
    { label: "Governance and Legal Training", href: "training.html#governance-training" },
    { label: "Electronics & Semiconductor Training", href: "training.html#electronics-training", exclusive: true },
    { label: "Heavy Machineries Programs", href: "training.html#heavy-machineries-trainings" },
  ];

  const consultancyItems = [
    { label: "ISO Professional Consultation and Audits", href: "consultancy.html" },
  ];

  React.useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 24);
    onScroll(); window.addEventListener("scroll", onScroll, { passive: true });
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  React.useEffect(() => {
    const handleResize = () => {
      if (window.innerWidth > 850 && mobileOpen) {
        setMobileOpen(false);
      }
    };
    window.addEventListener("resize", handleResize, { passive: true });
    return () => window.removeEventListener("resize", handleResize);
  }, [mobileOpen]);

  const handleMobileLink = (e, href) => {
    if (href.startsWith('#')) {
      e.preventDefault();
      setMobileOpen(false);
      setTimeout(() => {
        document.querySelector(href)?.scrollIntoView({ behavior: 'smooth' });
      }, 100);
    } else {
      setMobileOpen(false);
    }
  };

  return (
    <nav className={"nav " + (scrolled ? "is-scrolled" : "")}>
      {/* Logo Section - Top */}
      <div className="nav-logo-section">
        <a href="index.html" className="nav-logo-link">
          <img src="assets/aeq-logo-transparent.png" alt="AEQ Logo" className="nav-logo-img" />
        </a>
        <div className="nav-company-name">AEQ SAFETY RESPOND AND ENGINEERING</div>
        <div className="nav-company-tagline">TRAINING & CONSULTANCY PLT</div>
      </div>

      {/* Menu Section - Middle */}
      <div className="nav-menu-section">
        {/* Desktop Navigation Links */}
        <div className="nav-links">
          <a href="index.html" className="nav-link">Home</a>

          {/* Training with Dropdown */}
          <div
            className="nav-dropdown"
            onMouseEnter={() => setTrainingOpen(true)}
            onMouseLeave={() => setTrainingOpen(false)}
          >
            <div className="nav-link-with-dropdown">
              <a href="training.html" className="nav-link nav-link-main">Training</a>
              <button
                className="nav-dropdown-arrow-btn"
                onClick={(e) => { e.preventDefault(); setTrainingOpen(!trainingOpen); }}
              >
                <svg className={`nav-dropdown-arrow ${trainingOpen ? 'is-open' : ''}`} width="10" height="10" viewBox="0 0 10 10" fill="currentColor">
                  <path d="M2 4L5 7L8 4" stroke="currentColor" strokeWidth="1.5" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
                </svg>
              </button>
            </div>
            <div className={`nav-dropdown-menu ${trainingOpen ? 'is-open' : ''}`}>
              {trainingItems.map((item) => (
                <a key={item.href} href={item.href} className={`nav-dropdown-item ${item.exclusive ? 'is-exclusive' : ''}`}>
                  {item.label}
                  {item.exclusive && <span className="exclusive-tag">EXCLUSIVE</span>}
                </a>
              ))}
            </div>
          </div>

          {/* Consultancy with Dropdown */}
          <div
            className="nav-dropdown"
            onMouseEnter={() => setConsultancyOpen(true)}
            onMouseLeave={() => setConsultancyOpen(false)}
          >
            <div className="nav-link-with-dropdown">
              <a href="consultancy.html" className="nav-link nav-link-main">Consultancy</a>
              <button
                className="nav-dropdown-arrow-btn"
                onClick={(e) => { e.preventDefault(); setConsultancyOpen(!consultancyOpen); }}
              >
                <svg className={`nav-dropdown-arrow ${consultancyOpen ? 'is-open' : ''}`} width="10" height="10" viewBox="0 0 10 10" fill="currentColor">
                  <path d="M2 4L5 7L8 4" stroke="currentColor" strokeWidth="1.5" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
                </svg>
              </button>
            </div>
            <div className={`nav-dropdown-menu ${consultancyOpen ? 'is-open' : ''}`}>
              {consultancyItems.map((item) => (
                <a key={item.href} href={item.href} className="nav-dropdown-item">
                  {item.label}
                </a>
              ))}
            </div>
          </div>

          <a href="assessments.html" className="nav-link">Assessments</a>
          <a href="news.html" className="nav-link">News & Education</a>
          <a href="events.html" className="nav-link">Events</a>
          <a href="contact.html" className="nav-link">Contact</a>
        </div>

        {/* Mobile Hamburger Button */}
        <button
          className={`nav-hamburger ${mobileOpen ? 'is-open' : ''}`}
          onClick={() => setMobileOpen(!mobileOpen)}
          aria-label="Toggle menu"
          aria-expanded={mobileOpen}
        >
          <span className="hamburger-line"></span>
          <span className="hamburger-line"></span>
          <span className="hamburger-line"></span>
        </button>
      </div>

      {/* Mobile Dropdown Menu */}
      <div className={`nav-mobile-dropdown-panel ${mobileOpen ? 'is-open' : ''}`}>
        <div className="nav-mobile-links">
          <a href="index.html" className="nav-mobile-link" onClick={(e) => handleMobileLink(e, 'index.html')}>
            Home
          </a>

          <div className="nav-mobile-dropdown">
            <div className="nav-mobile-link-with-dropdown">
              <a
                href="training.html"
                className="nav-mobile-link nav-mobile-link-main"
                onClick={(e) => handleMobileLink(e, 'training.html')}
              >
                Training
              </a>
              <button
                className={`nav-mobile-arrow-btn ${mobileTrainingOpen ? 'is-open' : ''}`}
                onClick={() => setMobileTrainingOpen(!mobileTrainingOpen)}
              >
                <svg className={`nav-mobile-dropdown-arrow ${mobileTrainingOpen ? 'is-open' : ''}`} width="12" height="12" viewBox="0 0 10 10" fill="currentColor">
                  <path d="M2 4L5 7L8 4" stroke="currentColor" strokeWidth="1.5" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
                </svg>
              </button>
            </div>
            <div className={`nav-mobile-submenu ${mobileTrainingOpen ? 'is-open' : ''}`}>
              {trainingItems.map((item) => (
                <a
                  key={item.href}
                  href={item.href}
                  className={`nav-mobile-submenu-item ${item.exclusive ? 'is-exclusive' : ''}`}
                  onClick={(e) => handleMobileLink(e, item.href)}
                >
                  {item.label}
                  {item.exclusive && <span className="exclusive-tag-mobile">EXCLUSIVE</span>}
                </a>
              ))}
            </div>
          </div>

          <div className="nav-mobile-dropdown">
            <div className="nav-mobile-link-with-dropdown">
              <a
                href="consultancy.html"
                className="nav-mobile-link nav-mobile-link-main"
                onClick={(e) => handleMobileLink(e, 'consultancy.html')}
              >
                Consultancy
              </a>
              <button
                className={`nav-mobile-arrow-btn ${mobileConsultancyOpen ? 'is-open' : ''}`}
                onClick={() => setMobileConsultancyOpen(!mobileConsultancyOpen)}
              >
                <svg className={`nav-mobile-dropdown-arrow ${mobileConsultancyOpen ? 'is-open' : ''}`} width="12" height="12" viewBox="0 0 10 10" fill="currentColor">
                  <path d="M2 4L5 7L8 4" stroke="currentColor" strokeWidth="1.5" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
                </svg>
              </button>
            </div>
            <div className={`nav-mobile-submenu ${mobileConsultancyOpen ? 'is-open' : ''}`}>
              {consultancyItems.map((item) => (
                <a
                  key={item.href}
                  href={item.href}
                  className="nav-mobile-submenu-item"
                  onClick={(e) => handleMobileLink(e, item.href)}
                >
                  {item.label}
                </a>
              ))}
            </div>
          </div>

          <a href="assessments.html" className="nav-mobile-link" onClick={(e) => handleMobileLink(e, 'assessments.html')}>
            Assessments
          </a>
          <a href="news.html" className="nav-mobile-link" onClick={(e) => handleMobileLink(e, 'news.html')}>
            News & Education
          </a>
          <a href="events.html" className="nav-mobile-link" onClick={(e) => handleMobileLink(e, 'events.html')}>
            Events
          </a>
          <a href="contact.html" className="nav-mobile-link" onClick={(e) => handleMobileLink(e, 'contact.html')}>
            Contact
          </a>
        </div>
      </div>

      <style>{`
        .nav {
          position: fixed;
          top: 0;
          left: 0;
          right: 0;
          z-index: 50;
          display: flex;
          flex-direction: column;
          align-items: center;
          padding: 12px 24px;
          padding-top: calc(12px + env(safe-area-inset-top, 0px));
          transition: all 0.35s ease;
          background: rgba(3, 7, 18, 0.92);
          backdrop-filter: blur(20px);
          -webkit-backdrop-filter: blur(20px);
          border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .nav.is-scrolled {
          padding: 8px 24px;
          padding-top: calc(8px + env(safe-area-inset-top, 0px));
          background: rgba(3, 7, 18, 0.98);
          box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        /* Logo Section - White Banner */
        .nav-logo-section {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          width: 100vw;
          margin-left: calc(-50vw + 50%);
          margin-right: calc(-50vw + 50%);
          padding: 12px 24px 10px;
          margin-bottom: 8px;
          background: #ffffff;
          border-bottom: 1px solid rgba(0, 0, 0, 0.1);
          box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        .nav-logo-link {
          display: block;
          padding: 6px 16px;
          background: transparent;
          border-radius: 12px;
          transition: all 0.3s ease;
        }
        .nav-logo-link:hover {
          transform: scale(1.03);
        }
        .nav-logo-img {
          height: 80px;
          width: auto;
          transition: all 0.3s ease;
          display: block;
          filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.12));
        }
        .nav-logo-link:hover .nav-logo-img {
          filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.18));
        }
        .nav-company-name {
          font-family: 'Archivo', system-ui, sans-serif;
          font-size: 13px;
          font-weight: 500;
          letter-spacing: 0.15em;
          color: #1a1a1a;
          text-transform: uppercase;
          text-align: center;
          margin-top: 4px;
          margin-bottom: 2px;
          text-shadow: none;
          transition: all 0.3s ease;
        }
        .nav-company-tagline {
          font-family: 'Archivo', system-ui, sans-serif;
          font-size: 13px;
          font-weight: 500;
          letter-spacing: 0.15em;
          color: #1a1a1a;
          text-align: center;
          margin-bottom: 0;
          transition: all 0.3s ease;
        }
        .nav.is-scrolled .nav-logo-section {
          padding: 8px 24px 6px;
        }
        .nav.is-scrolled .nav-company-name {
          font-size: 11px;
          letter-spacing: 0.12em;
          margin-top: 2px;
          margin-bottom: 1px;
        }
        .nav.is-scrolled .nav-company-tagline {
          font-size: 11px;
          letter-spacing: 0.12em;
        }
        .nav.is-scrolled .nav-logo-link {
          padding: 4px 12px;
        }
        .nav.is-scrolled .nav-logo-img {
          height: 56px;
        }

        /* Menu Section */
        .nav-menu-section {
          display: flex;
          align-items: center;
          justify-content: center;
        }
        .nav-links {
          display: flex;
          align-items: center;
          gap: 6px;
        }
        .nav-link {
          padding: 8px 14px;
          font-size: 13px;
          font-weight: 600;
          color: #e2e8f0;
          text-decoration: none;
          text-transform: uppercase;
          letter-spacing: 0.03em;
          transition: all 0.2s ease;
          position: relative;
          min-height: 40px;
          display: flex;
          align-items: center;
          border-radius: 6px;
        }
        .nav-link:hover {
          color: #fbbf24;
          background: rgba(251, 191, 36, 0.1);
        }

        /* Desktop Dropdown */
        .nav-dropdown {
          position: relative;
        }
        .nav-link-with-dropdown {
          display: flex;
          align-items: center;
          gap: 2px;
        }
        .nav-link-main {
          padding-right: 6px;
        }
        .nav-dropdown-arrow-btn {
          display: flex;
          align-items: center;
          justify-content: center;
          padding: 8px 8px;
          background: none;
          border: none;
          cursor: pointer;
          color: #e2e8f0;
          border-radius: 4px;
          transition: all 0.2s ease;
        }
        .nav-dropdown-arrow-btn:hover {
          background: rgba(251, 191, 36, 0.15);
          color: #fbbf24;
        }
        .nav-dropdown-trigger {
          display: flex;
          align-items: center;
          gap: 5px;
          background: none;
          border: none;
          cursor: pointer;
          font-family: inherit;
        }
        .nav-dropdown-arrow {
          transition: transform 0.2s ease;
        }
        .nav-dropdown-arrow.is-open {
          transform: rotate(180deg);
        }
        .nav-dropdown-menu {
          position: absolute;
          top: 100%;
          left: 50%;
          transform: translateX(-50%);
          min-width: 300px;
          padding: 8px;
          background: rgba(10, 15, 26, 0.98);
          border: 1px solid rgba(255, 255, 255, 0.15);
          border-radius: 12px;
          box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
          opacity: 0;
          visibility: hidden;
          transform: translateX(-50%) translateY(10px);
          transition: all 0.2s ease;
          z-index: 100;
          margin-top: 8px;
        }
        .nav-dropdown-menu.is-open {
          opacity: 1;
          visibility: visible;
          transform: translateX(-50%) translateY(0);
        }
        .nav-dropdown-item {
          display: flex;
          align-items: center;
          justify-content: space-between;
          padding: 12px 16px;
          font-size: 13px;
          font-weight: 500;
          color: #94a3b8;
          text-decoration: none;
          border-radius: 8px;
          transition: all 0.15s ease;
        }
        .nav-dropdown-item:hover {
          color: #ffffff;
          background: rgba(6, 182, 212, 0.15);
        }
        .nav-dropdown-item.is-exclusive {
          background: linear-gradient(135deg, rgba(251, 191, 36, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
          border: 1px solid rgba(251, 191, 36, 0.2);
          color: #fbbf24;
        }
        .nav-dropdown-item.is-exclusive:hover {
          background: linear-gradient(135deg, rgba(251, 191, 36, 0.2) 0%, rgba(245, 158, 11, 0.1) 100%);
          border-color: rgba(251, 191, 36, 0.4);
          color: #fcd34d;
        }
        .exclusive-tag {
          padding: 2px 6px;
          background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
          color: #1c1917;
          font-size: 9px;
          font-weight: 700;
          border-radius: 4px;
          letter-spacing: 0.05em;
        }

        /* Mobile Hamburger Button */
        .nav-hamburger {
          display: none;
          flex-direction: column;
          justify-content: center;
          align-items: center;
          gap: 5px;
          width: 44px;
          height: 44px;
          background: transparent;
          border: none;
          cursor: pointer;
          padding: 10px;
        }
        .hamburger-line {
          display: block;
          width: 24px;
          height: 2px;
          background: #fff;
          border-radius: 2px;
          transition: all 0.3s ease;
        }
        .nav-hamburger.is-open .hamburger-line:nth-child(1) {
          transform: translateY(7px) rotate(45deg);
        }
        .nav-hamburger.is-open .hamburger-line:nth-child(2) {
          opacity: 0;
        }
        .nav-hamburger.is-open .hamburger-line:nth-child(3) {
          transform: translateY(-7px) rotate(-45deg);
        }

        /* Mobile Dropdown Panel */
        .nav-mobile-dropdown-panel {
          display: none;
          width: 100%;
          background: rgba(3, 7, 18, 0.98);
          border-top: 1px solid rgba(255, 255, 255, 0.1);
          max-height: 0;
          overflow: hidden;
          transition: max-height 0.3s ease;
        }
        .nav-mobile-dropdown-panel.is-open {
          max-height: 70vh;
          overflow-y: auto;
        }

        .nav-mobile-links {
          display: flex;
          flex-direction: column;
          padding: 16px;
          gap: 4px;
        }
        .nav-mobile-link {
          display: flex;
          align-items: center;
          justify-content: space-between;
          padding: 14px 16px;
          font-size: 14px;
          font-weight: 600;
          color: #e2e8f0;
          text-decoration: none;
          text-transform: uppercase;
          letter-spacing: 0.02em;
          border-radius: 10px;
          background: rgba(255, 255, 255, 0.03);
          transition: all 0.2s ease;
          min-height: 48px;
        }
        .nav-mobile-link:hover,
        .nav-mobile-link:active {
          background: rgba(251, 191, 36, 0.1);
          color: #fbbf24;
        }

        /* Mobile Dropdown */
        .nav-mobile-dropdown {
          display: flex;
          flex-direction: column;
        }
        .nav-mobile-link-with-dropdown {
          display: flex;
          align-items: center;
          gap: 0;
        }
        .nav-mobile-link-main {
          flex: 1;
          border-radius: 10px 0 0 10px;
        }
        .nav-mobile-arrow-btn {
          display: flex;
          align-items: center;
          justify-content: center;
          padding: 14px 16px;
          min-height: 48px;
          background: rgba(255, 255, 255, 0.05);
          border: none;
          border-left: 1px solid rgba(255, 255, 255, 0.1);
          border-radius: 0 10px 10px 0;
          cursor: pointer;
          color: #e2e8f0;
          transition: all 0.2s ease;
        }
        .nav-mobile-arrow-btn:hover,
        .nav-mobile-arrow-btn:active,
        .nav-mobile-arrow-btn.is-open {
          background: rgba(251, 191, 36, 0.15);
          color: #fbbf24;
        }
        .nav-mobile-dropdown-trigger {
          background: none;
          border: none;
          cursor: pointer;
          font-family: inherit;
          text-align: left;
        }
        .nav-mobile-dropdown-arrow {
          transition: transform 0.2s ease;
          flex-shrink: 0;
        }
        .nav-mobile-dropdown-arrow.is-open {
          transform: rotate(180deg);
        }
        .nav-mobile-submenu {
          display: none;
          flex-direction: column;
          gap: 2px;
          padding: 8px 0 8px 20px;
          border-left: 2px solid rgba(251, 191, 36, 0.3);
          margin-left: 16px;
        }
        .nav-mobile-submenu.is-open {
          display: flex;
        }
        .nav-mobile-submenu-item {
          padding: 12px 14px;
          font-size: 13px;
          font-weight: 500;
          color: #94a3b8;
          text-decoration: none;
          border-radius: 8px;
          transition: all 0.15s ease;
          display: flex;
          align-items: center;
          justify-content: space-between;
        }
        .nav-mobile-submenu-item:hover,
        .nav-mobile-submenu-item:active {
          color: #ffffff;
          background: rgba(251, 191, 36, 0.1);
        }
        .nav-mobile-submenu-item.is-exclusive {
          background: linear-gradient(135deg, rgba(251, 191, 36, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
          border: 1px solid rgba(251, 191, 36, 0.2);
          color: #fbbf24;
        }
        .nav-mobile-submenu-item.is-exclusive:hover,
        .nav-mobile-submenu-item.is-exclusive:active {
          background: linear-gradient(135deg, rgba(251, 191, 36, 0.2) 0%, rgba(245, 158, 11, 0.1) 100%);
          color: #fcd34d;
        }
        .exclusive-tag-mobile {
          padding: 2px 6px;
          background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
          color: #1c1917;
          font-size: 8px;
          font-weight: 700;
          border-radius: 4px;
          letter-spacing: 0.05em;
        }

        /* Responsive */
        @media (max-width: 900px) {
          .nav-links {
            display: none;
          }
          .nav-hamburger {
            display: flex;
          }
          .nav-mobile-dropdown-panel {
            display: block;
          }
          .nav-menu-section {
            margin-bottom: 0;
          }
        }
        @media (max-width: 500px) {
          .nav {
            padding: 10px 16px;
          }
          .nav-logo-section {
            padding: 16px 16px 12px;
          }
          .nav-logo-link {
            padding: 10px 16px;
          }
          .nav-logo-img {
            height: 120px;
          }
          .nav-company-name {
            font-size: 11px;
            letter-spacing: 0.12em;
          }
          .nav-company-tagline {
            font-size: 11px;
            letter-spacing: 0.12em;
          }
          .nav.is-scrolled .nav-logo-section {
            padding: 10px 16px 8px;
          }
          .nav.is-scrolled .nav-logo-link {
            padding: 8px 12px;
          }
          .nav.is-scrolled .nav-logo-img {
            height: 80px;
          }
          .nav.is-scrolled .nav-company-name {
            font-size: 9px;
            letter-spacing: 0.08em;
          }
          .nav.is-scrolled .nav-company-tagline {
            font-size: 9px;
            letter-spacing: 0.08em;
          }
        }
      `}</style>
    </nav>
  );
}
window.Nav = Nav;
