diff --git a/TODO.md b/TODO.md
index 2b0753e..5f5cbd9 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,12 +1,6 @@
 # TODO
 
-- [x] Add fixed top gradient on partage main element, mirror of bottom gradient
-- [x] Remove bottom border on `.thesis-add-header`
-- [x] Add subtitle "Formulaire pour XAMXAM" below partage header, with Ductus link to /
-- [x] Switch `.thesis-add-header` to grid layout
-- [ ] Create `admin/operation.php` — unified add/edit page
-- [ ] Wire up route: `?id=` → edit mode, no id → add mode
-- [ ] Update all references: `add.php` → `operation.php`, `edit.php` → `operation.php?id=`
-- [ ] Keep old `add.php` and `edit.php` as redirect stubs
-- [ ] Keep action endpoints (`actions/formulaire.php`, `actions/edit.php`) unchanged
-- [ ] Test both flows
+- [x] Move default semantic form element styles (checkbox, radio, select) from admin.css/form.css into common.css
+- [x] Keep specific layouts/classes in form.css (admin-form grid, checkbox-group layout, etc.)
+- [x] Ensure selects, checkboxes, and radios are properly styled globally
+- [x] Converge towards the styled form appearance rather than unstyled
diff --git a/app/public/assets/css/admin.css b/app/public/assets/css/admin.css
index d7f4edc..6f6646a 100644
--- a/app/public/assets/css/admin.css
+++ b/app/public/assets/css/admin.css
@@ -653,13 +653,11 @@
 
 .admin-input--inline,
 .admin-inline-form input[type="text"] {
-    font-size: var(--step--1);
     width: 160px;
 }
 
 .admin-select--inline,
 .admin-inline-form select {
-    font-size: var(--step--1);
     width: 160px;
 }
 
@@ -877,7 +875,7 @@
     background: var(--bg-secondary);
 }
 
-.param-maintenance-row:has( .param-btn-warning ) {
+.param-maintenance-row:has( .btn--warning ) {
     background: var(--warning-muted-bg);
     border-color: var(--warning);
 }
@@ -900,21 +898,17 @@
     display: flex;
     flex-direction: column;
     gap: var(--space-xs);
+    padding-top: var(--space-s);
 }
 
 .param-form fieldset > * {
     margin-bottom: 0;
 }
 
-.param-form legend {
-    padding: 0 var(--space-xs);
-}
-
 .param-checkbox {
     display: flex;
     align-items: flex-start;
     gap: var(--space-xs);
-    font-size: var(--step--1);
     cursor: pointer;
 }
 
@@ -924,11 +918,6 @@
 }
 
 .param-checkbox input[type="checkbox"] {
-    accent-color: var(--accent-primary);
-    width: 16px;
-    height: 16px;
-    cursor: pointer;
-    flex-shrink: 0;
     margin-top: 2px;
 }
 
@@ -936,13 +925,7 @@
     cursor: not-allowed;
 }
 
-.param-checkbox small {
-    color: var(--text-secondary);
-    font-size: var(--step--2);
-}
-
 .param-note {
-    font-size: var(--step--1);
     color: var(--text-secondary);
     margin: 0;
 }
@@ -951,7 +934,6 @@
     display: flex;
     flex-direction: column;
     gap: var(--space-xs);
-    font-size: var(--step--1);
     margin-bottom: var(--space-m);
 }
 
@@ -999,26 +981,6 @@
 .param-form input[type="password"] {
     width: 100%;
     max-width: 380px;
-    border: none;
-    border-bottom: 1px solid var(--border-primary);
-    border-radius: 0;
-    padding: var(--space-3xs) 0;
-}
-
-.param-form input[type="password"]:focus {
-    border-bottom: 2px solid var(--accent-primary);
-}
-
-.param-form > button {
-    /* deprecated alias for .btn--primary; kept for backward-compat */
-}
-
-.param-btn-warning {
-    /* deprecated alias for .btn--warning; kept for backward-compat */
-}
-
-.param-btn-danger {
-    /* deprecated alias for .btn--danger; kept for backward-compat */
 }
 
 .param-danger-zone {
@@ -1029,11 +991,9 @@
 .param-danger-zone legend {
     color: var(--error);
     font-size: var(--step-0);
-    padding: 0 var(--space-xs);
 }
 
 .param-danger-zone p {
-    font-size: var(--step--1);
     color: var(--text-secondary);
     margin-bottom: var(--space-xs);
 }
@@ -1049,27 +1009,17 @@
 
 .param-export-zone legend {
     font-size: var(--step-0);
-    padding: 0 var(--space-xs);
 }
 
 .param-export-zone p {
-    font-size: var(--step--1);
     color: var(--text-secondary);
     margin-bottom: var(--space-xs);
 }
 
-.param-btn-export {
-    /* deprecated alias for .btn--primary; kept for backward-compat */
-}
-
-
 /* ── SMTP section ─────────────────────────────────────────────────────── */
 .param-smtp-test {
     margin-top: var(--space-m);
 }
-.param-smtp-test-form {
-    margin-top: var(--space-s);
-}
 .param-smtp-test-row {
     display: flex;
     align-items: flex-end;
@@ -1080,8 +1030,6 @@
     flex: 1 1 260px;
 }
 .param-smtp-test-row label {
-    display: block;
-    font-size: var(--step--1);
     font-weight: 600;
     margin-bottom: var(--space-2xs);
     color: var(--text-secondary);
@@ -1103,7 +1051,6 @@
     display: flex;
     align-items: center;
     gap: var(--space-s);
-    font-size: var(--step--1);
     margin: var(--space-xs) 0 var(--space-s);
     color: var(--text-secondary);
 }
@@ -1124,7 +1071,6 @@
     display: flex;
     flex-direction: column;
     gap: var(--space-3xs);
-    font-size: var(--step--1);
     color: var(--text-secondary);
 }
 .param-grid input[type="text"],
@@ -1132,27 +1078,12 @@
 .param-grid input[type="email"],
 .param-grid select {
     width: 100%;
-    border: none;
-    border-bottom: 1px solid var(--border-primary);
-    border-radius: 0;
-    padding: var(--space-3xs) 0;
-}
-.param-grid input:focus,
-.param-grid select:focus {
-    border-bottom: 2px solid var(--accent-primary);
-}
-.param-grid select {
-    background-position: right 0 center;
-    padding-right: 1.2rem;
-}
-.param-fieldset-inline legend {
-    padding: 0 var(--space-xs);
 }
 
 /* SMTP field validation error state */
 .param-grid input[aria-invalid="true"],
 .param-grid select[aria-invalid="true"] {
-    border-bottom-color: var(--search-error-border, #c0392b);
+    border-color: var(--search-error-border, #c0392b);
 }
 
 .param-field-error {
@@ -1707,11 +1638,6 @@
 .fhb-name-input {
     width: 100%;
     max-width: 400px;
-    padding: var(--space-2xs) var(--space-xs);
-    border: 1px solid var(--border-primary);
-    border-radius: var(--radius);
-    font-size: var(--step--1);
-    font-family: var(--font-body);
 }
 
 .fhb-name-input:focus {
diff --git a/app/public/assets/css/common.css b/app/public/assets/css/common.css
index 512eeff..fe4f101 100644
--- a/app/public/assets/css/common.css
+++ b/app/public/assets/css/common.css
@@ -411,12 +411,13 @@ label {
   margin-bottom: var(--space-3xs);
 }
 
+/* ── Text inputs, selects, textareas ─────────────────────────────── */
+
 input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):not(
   [type="hidden"]
 ):not([type="submit"]):not([type="button"]):not([type="reset"]):not(
   [type="color"]
 ),
-select,
 textarea {
   font-family: inherit;
   font-size: var(--step--1);
@@ -433,7 +434,6 @@ input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):not(
 ):not([type="submit"]):not([type="button"]):not([type="reset"]):not(
   [type="color"]
 ):focus,
-select:focus,
 textarea:focus {
   outline: none;
   border: 2px solid var(--accent-primary);
@@ -451,14 +451,45 @@ textarea {
   line-height: 1.5;
 }
 
+/* ── Select ──────────────────────────────────────────────────────── */
+
 select {
+  font-family: inherit;
+  font-size: var(--step--1);
+  padding: var(--space-2xs) var(--space-xs);
+  padding-right: 1.75rem;
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius);
+  background: transparent;
+  color: var(--text-primary);
   cursor: pointer;
   background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23999' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
   background-repeat: no-repeat;
-  background-position: right 0.5rem center;
-  padding-right: 1.5rem;
+  background-position: right 0.55rem center;
   -webkit-appearance: none;
   appearance: none;
+  transition: border-color 0.15s;
+}
+
+select:focus {
+  outline: none;
+  border: 2px solid var(--accent-primary);
+}
+
+/* ── Checkboxes & radios ─────────────────────────────────────────── */
+
+input[type="checkbox"],
+input[type="radio"] {
+  accent-color: var(--accent-primary);
+  width: 16px;
+  height: 16px;
+  cursor: pointer;
+  flex-shrink: 0;
+  margin: 0;
+}
+
+input[type="radio"] {
+  border-radius: 50%;
 }
 
 /* ============================================================
diff --git a/app/public/assets/css/form.css b/app/public/assets/css/form.css
index fbdab93..4a19e3c 100644
--- a/app/public/assets/css/form.css
+++ b/app/public/assets/css/form.css
@@ -31,7 +31,7 @@
   font-weight: 400;
 }
 
-/* ── Inputs, selects, textareas (admin forms use bottom-border style) ──── */
+/* ── Inputs, selects, textareas ──────────────────────────────────────────── */
 .admin-form
   input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):not(
     [type="hidden"]
@@ -42,34 +42,12 @@
 .admin-inline-form input[type="number"],
 .admin-inline-form select {
   width: 100%;
-  border: none;
-  border-bottom: 1px solid var(--border-primary);
-  border-radius: 0;
-  padding: var(--space-3xs) 0;
-}
-
-.admin-form
-  input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):not(
-    [type="hidden"]
-  ):not([type="submit"]):focus,
-.admin-form select:focus,
-.admin-form textarea:focus,
-.admin-inline-form input:focus,
-.admin-inline-form select:focus {
-  border-bottom: 2px solid var(--accent-primary);
 }
 
 .admin-form textarea {
   min-height: 100px;
 }
 
-/* Select custom arrow overrides for bottom-border style */
-.admin-form select,
-.admin-inline-form select {
-  background-position: right 0 center;
-  padding-right: 1.2rem;
-}
-
 /* ── Required-field indicators ──────────────────────────────────────────── */
 .admin-form
   input:not([type="checkbox"]):not([type="radio"]):not([type="file"]):not(
@@ -77,7 +55,7 @@
   ):not([type="submit"]):required,
 .admin-form select:required,
 .admin-form textarea:required {
-  border-bottom-style: dashed;
+  border-style: dashed;
 }
 
 .admin-form
@@ -168,13 +146,6 @@
   cursor: pointer;
 }
 
-.admin-checkbox-label input[type="checkbox"] {
-  accent-color: var(--accent-primary);
-  width: 14px;
-  height: 14px;
-  cursor: pointer;
-}
-
 /* ── Fieldsets & legends ────────────────────────────────────────────────── */
 /* Base fieldset/legend styles live in common.css */
 .admin-body fieldset,
@@ -355,15 +326,6 @@
   margin: 0;
 }
 
-.licence-explanation legend {
-  font-size: var(--step--1);
-  font-weight: 600;
-  letter-spacing: 0.04em;
-  text-transform: uppercase;
-  color: var(--text-secondary);
-  padding: 0 var(--space-2xs);
-}
-
 .licence-info h3 {
   margin-top: var(--space-m);
 }
@@ -479,7 +441,6 @@
 
 .password-gate input[type="password"] {
   width: 100%;
-  padding: var(--space-xs);
   margin: var(--space-2xs) 0 var(--space-s);
 }
 
@@ -1021,12 +982,8 @@ a.recap-file-name:hover {
 }
 
 .retry-email-form input[type="email"] {
-  padding: var(--space-xs) var(--space-s);
-  border: 1px solid var(--border-primary);
-  border-radius: var(--radius);
   font-size: var(--step-0);
   width: 100%;
-  box-sizing: border-box;
 }
 
 .retry-email-form input.input-error {
diff --git a/app/public/assets/css/repertoire.css b/app/public/assets/css/repertoire.css
index 9274d87..6dc0274 100644
--- a/app/public/assets/css/repertoire.css
+++ b/app/public/assets/css/repertoire.css
@@ -261,13 +261,8 @@
 
 .search-filter-select {
     font-size: var(--step--1);
-    border: 1px solid var(--border-primary);
-    border-radius: var(--radius);
     padding: var(--space-3xs) var(--space-2xs);
-    background: var(--bg-primary);
-    color: var(--text-primary);
-    font-family: inherit;
-    cursor: pointer;
+    padding-right: 1.75rem;
 }
 
 .search-filter-select:focus {
diff --git a/app/public/assets/css/tfe.css b/app/public/assets/css/tfe.css
index e8fedc1..7a26357 100644
--- a/app/public/assets/css/tfe.css
+++ b/app/public/assets/css/tfe.css
@@ -255,13 +255,6 @@ aside figcaption {
 .tfe-access-request-form input[type="email"],
 .tfe-access-request-form textarea {
     padding: var(--space-2xs) var(--space-3xs);
-    border-color: var(--border);
-    background: var(--background);
-}
-
-.tfe-access-request-form input[type="email"]:focus,
-.tfe-access-request-form textarea:focus {
-    border: 2px solid var(--accent);
 }
 
 .tfe-btn-request-access {
diff --git a/app/templates/admin/parametres.php b/app/templates/admin/parametres.php
index 376958e..53caa47 100644
--- a/app/templates/admin/parametres.php
+++ b/app/templates/admin/parametres.php
@@ -263,7 +263,7 @@
                 </div>
             </div>
 
-            <fieldset class="param-fieldset-inline">
+            <fieldset>
                 <legend>Expéditeur par défaut</legend>
                 <div class="param-grid">
                     <div>
@@ -292,13 +292,13 @@
         </form>
 
         <!-- Test d'envoi -->
-        <fieldset class="param-fieldset-inline param-smtp-test">
+        <fieldset class="param-smtp-test">
             <legend>Tester l'envoi d'un e-mail</legend>
             <p>Envoie un e-mail de test via le relay SMTP configuré ci-dessus.</p>
             <?php if (!$smtpConfigured): ?>
                 <p class="param-note">⚠ Configurez le relay SMTP avant de pouvoir tester l'envoi.</p>
             <?php else: ?>
-                <form method="post" action="actions/smtp-test.php" class="param-form param-smtp-test-form">
+                <form method="post" action="actions/smtp-test.php" class="param-form">
                     <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
                     <div class="param-smtp-test-row">
                         <div>
@@ -472,7 +472,7 @@
                 <input type="hidden" name="action" value="remove_credentials">
                 <input type="hidden" name="redirect" value="/admin/parametres.php">
                 <input type="hidden" name="current_password_remove" value="">
-                <button type="submit" class="param-btn-danger">Supprimer le mot de passe</button>
+                <button type="submit" class="btn btn--danger">Supprimer le mot de passe</button>
             </form>
         </fieldset>
         <?php endif; ?>