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+<!DOCTYPE html>
+<html lang="fr">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Flat vs Skeuo</title>
+  <style>
+    body    { font-family: system-ui, sans-serif; margin: 0; padding: 2rem; }
+    section { max-width: 360px; margin: 0 auto 3rem; padding: 2rem; }
+    form    { display: flex; flex-direction: column; gap: .5rem; }
+    /* ===== Version 1 : Flat design ===== */
+
+    /* ===== Version 2 : Skeuomorphisme (look 2010) ===== */
+
+  </style>
+</head>
+<body>
+  <section class="flat">
+    <h2>Version 1 - Flat</h2>
+    <form>
+      <label for="email1">Email</label>
+      <input type="email" id="email1" placeholder="prenom.nom@exemple.fr">
+      <label for="mdp1">Mot de passe</label>
+      <input type="password" id="mdp1">
+      <button type="submit">Se connecter</button>
+    </form>
+  </section>
+  <section class="skeuo">
+    <h2>Version 2 - Skeuomorphisme</h2>
+    <form>
+      <label for="email2">Email</label>
+      <input type="email" id="email2" placeholder="prenom.nom@exemple.fr">
+      <label for="mdp2">Mot de passe</label>
+      <input type="password" id="mdp2">
+      <button type="submit">Se connecter</button>
+    </form>
+  </section>
+  <!-- Analyse (Q.a, Q.b, Q.c) : -->
+</body>
+</html>