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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Sign in – File Hub</title>
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
  <style>
    :root { --accent-rgb: 25,85,130; }
    body  { background:#f8fafc; }
    .btn-primary,
    .btn-primary:hover,
    .btn-primary:focus {
      background:rgb(var(--accent-rgb)) !important;
      border-color:rgb(var(--accent-rgb)) !important;
    }
  </style>
</head>

<body class="d-flex justify-content-center align-items-center vh-100">
  <div class="card shadow p-4" style="min-width:325px">
    <h4 class="mb-3 text-center">Welcome to File Hub</h4>

    <form method="POST" class="needs-validation" novalidate>
      <div class="mb-3">
        <label class="form-label">Your name</label>
        <input class="form-control" name="username" required autofocus placeholder="e.g. Kevin">
        <div class="invalid-feedback">Please choose a name.</div>
      </div>
      <button class="btn btn-primary w-100">Enter</button>
    </form>

    {% with messages = get_flashed_messages() %}
      {% if messages %}
        <div class="alert alert-warning mt-3">{{ messages[0] }}</div>
      {% endif %}
    {% endwith %}
  </div>

  <script>
    /* simple Bootstrap validation */
    (function () {
      'use strict';
      const forms = document.querySelectorAll('.needs-validation');
      Array.from(forms).forEach(form => {
        form.addEventListener('submit', evt => {
          if (!form.checkValidity()) { evt.preventDefault(); evt.stopPropagation(); }
          form.classList.add('was-validated');
        }, false);
      });
    })();
  </script>
</body>
</html>