diff --git a/website/css/style.css b/website/css/style.css
index c81c97d..7e10fbf 100644
--- a/website/css/style.css
+++ b/website/css/style.css
@@ -1,26 +1,89 @@
 :root {
-    --bg: #f4f6f9;
-    --surface: #ffffff;
-    --primary: #2563eb;
-    --primary-hover: #1d4ed8;
-    --danger: #dc2626;
-    --danger-hover: #b91c1c;
-    --success: #16a34a;
-    --warning: #d97706;
-    --text: #1e293b;
-    --text-secondary: #64748b;
-    --border: #e2e8f0;
+    color-scheme: dark;
+    --bg: #0f1218;
+    --surface: #1a1f2a;
+    --surface-raised: #222836;
+    --surface-hover: #2a3140;
+    --surface-muted: #161b24;
+    --primary: #3b82f6;
+    --primary-hover: #60a5fa;
+    --primary-subtle: rgba(59, 130, 246, 0.14);
+    --primary-border: rgba(59, 130, 246, 0.35);
+    --primary-text: #93c5fd;
+    --danger: #f87171;
+    --danger-hover: #fca5a5;
+    --danger-subtle: rgba(248, 113, 113, 0.12);
+    --danger-subtle-hover: rgba(248, 113, 113, 0.22);
+    --danger-border: rgba(248, 113, 113, 0.45);
+    --danger-text: #fca5a5;
+    --danger-focus-ring: rgba(248, 113, 113, 0.35);
+    --success: #4ade80;
+    --warning: #fbbf24;
+    --text: #e8edf4;
+    --text-secondary: #94a3b8;
+    --text-on-primary: #fff;
+    --border: #2e3648;
     --radius: 8px;
-    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
-    --shadow-lg: 0 4px 12px rgba(0,0,0,.1);
+    --shadow: 0 1px 3px rgba(0, 0, 0, 0.35), 0 1px 2px rgba(0, 0, 0, 0.25);
+    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.45);
+    --focus-ring: rgba(59, 130, 246, 0.28);
     --sidebar-width: 240px;
     --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
-    /* Incomplete translation highlight (neutral, not yellow) */
-    --trans-missing-bg: #f8fafc;
-    --trans-missing-bg-hover: #f1f5f9;
-    --trans-missing-border: #cbd5e1;
+    --table-header-bg: #1e2430;
+    --row-hover-bg: #252c3a;
+    --test-row-bg: #2a2618;
+    --test-row-hover-bg: #3a321f;
+    --sticky-shadow: rgba(0, 0, 0, 0.35);
+    /* Incomplete translation highlight */
+    --trans-missing-bg: #1c222d;
+    --trans-missing-bg-hover: #242b38;
+    --trans-missing-border: #3d4a5c;
     --trans-missing-accent: #64748b;
-    --trans-missing-placeholder: #94a3b8;
+    --trans-missing-placeholder: #64748b;
+    /* Status badges */
+    --badge-draft-bg: #2a3140;
+    --badge-draft-fg: #94a3b8;
+    --badge-active-bg: rgba(74, 222, 128, 0.15);
+    --badge-active-fg: #4ade80;
+    --badge-archived-bg: rgba(251, 191, 36, 0.15);
+    --badge-archived-fg: #fbbf24;
+    --badge-in-progress-bg: var(--primary-subtle);
+    --badge-in-progress-fg: var(--primary-text);
+    --badge-pending-bg: var(--badge-draft-bg);
+    --badge-pending-fg: var(--badge-draft-fg);
+    --badge-admin-bg: rgba(167, 139, 250, 0.18);
+    --badge-admin-fg: #c4b5fd;
+    --badge-supervisor-bg: rgba(244, 114, 182, 0.15);
+    --badge-supervisor-fg: #f9a8d4;
+    --badge-coach-bg: rgba(74, 222, 128, 0.12);
+    --badge-coach-fg: #86efac;
+    --badge-you-bg: var(--primary-subtle);
+    --badge-you-fg: var(--primary-text);
+    --badge-warn-bg: rgba(251, 191, 36, 0.15);
+    --badge-warn-fg: #fcd34d;
+    --badge-q-bg: var(--primary-subtle);
+    --badge-q-fg: var(--primary-text);
+    --badge-opt-bg: #2a3140;
+    --badge-opt-fg: #cbd5e1;
+    --badge-app-bg: rgba(74, 222, 128, 0.12);
+    --badge-app-fg: #86efac;
+    --badge-str-bg: rgba(167, 139, 250, 0.15);
+    --badge-str-fg: #c4b5fd;
+    --badge-branch-bg: rgba(167, 139, 250, 0.18);
+    --badge-branch-fg: #c4b5fd;
+    --lang-chip-fixed-bg: var(--primary-subtle);
+    --lang-chip-fixed-border: var(--primary-border);
+    --toast-success-bg: rgba(74, 222, 128, 0.12);
+    --toast-success-fg: #86efac;
+    --toast-success-border: rgba(74, 222, 128, 0.3);
+    --toast-error-bg: rgba(248, 113, 113, 0.12);
+    --toast-error-fg: #fca5a5;
+    --toast-error-border: rgba(248, 113, 113, 0.3);
+    --toast-info-bg: var(--primary-subtle);
+    --toast-info-fg: var(--primary-text);
+    --toast-info-border: var(--primary-border);
+    --save-flash-bg: var(--primary-subtle);
+    --progress-track: #2e3648;
 }
 
 *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
@@ -33,6 +96,29 @@ body {
     min-height: 100vh;
 }
 
+hr {
+    border: none;
+    border-top: 1px solid var(--border);
+    margin: 20px 0;
+}
+
+pre, code {
+    font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
+}
+pre {
+    background: var(--surface-muted);
+    border: 1px solid var(--border);
+    border-radius: var(--radius);
+    padding: 12px;
+    color: var(--text);
+}
+code {
+    background: var(--surface-raised);
+    padding: 1px 5px;
+    border-radius: 4px;
+    font-size: 0.9em;
+}
+
 /* Layout */
 .layout {
     display: flex;
@@ -81,7 +167,7 @@ body {
 }
 .sidebar-nav a:hover,
 .sidebar-nav a.active {
-    background: #f1f5f9;
+    background: var(--surface-hover);
     color: var(--primary);
 }
 .sidebar-nav a svg {
@@ -133,15 +219,56 @@ body {
     text-decoration: none;
     line-height: 1.4;
 }
-.btn:hover { background: #f8fafc; box-shadow: var(--shadow); }
-.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
-.btn-primary:hover { background: var(--primary-hover); }
-.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
-.btn-danger:hover { background: var(--danger-hover); }
+.btn:hover:not(.btn-primary):not(.btn-danger) {
+    background: var(--surface-hover);
+    box-shadow: var(--shadow);
+}
+.btn-primary {
+    background: var(--primary);
+    color: var(--text-on-primary);
+    border-color: var(--primary);
+}
+.btn-primary:hover {
+    background: var(--primary-hover);
+    border-color: var(--primary-hover);
+    box-shadow: var(--shadow);
+}
+.btn-danger {
+    background: var(--danger-subtle);
+    color: var(--danger-text);
+    border-color: var(--danger-border);
+}
+.btn-danger:hover {
+    background: var(--danger-subtle-hover);
+    border-color: var(--danger);
+    color: var(--danger-hover);
+    box-shadow: 0 0 0 1px var(--danger-border);
+}
+.btn-danger:focus-visible {
+    outline: none;
+    box-shadow: 0 0 0 3px var(--danger-focus-ring);
+}
 .btn-sm { padding: 4px 10px; font-size: .8rem; }
 .btn-block { width: 100%; justify-content: center; }
-.btn-icon { padding: 6px; border: none; background: transparent; }
-.btn-icon:hover { background: #f1f5f9; border-radius: 4px; }
+.btn-icon {
+    padding: 6px;
+    border: none;
+    background: transparent;
+    color: var(--text-secondary);
+}
+.btn-icon:hover:not(.btn-icon-danger) {
+    background: var(--surface-hover);
+    border-radius: 4px;
+    color: var(--text);
+}
+.btn-icon-danger {
+    color: var(--danger-text);
+}
+.btn-icon-danger:hover {
+    background: var(--danger-subtle);
+    color: var(--danger-hover);
+    border-radius: 4px;
+}
 
 /* Forms */
 .form-group {
@@ -172,7 +299,7 @@ body {
 .form-group textarea:focus {
     outline: none;
     border-color: var(--primary);
-    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
+    box-shadow: 0 0 0 3px var(--focus-ring);
 }
 .form-row {
     display: flex;
@@ -190,12 +317,12 @@ body {
     text-transform: uppercase;
     letter-spacing: .03em;
 }
-.badge-draft      { background: #f1f5f9; color: #64748b; }
-.badge-active     { background: #dcfce7; color: #16a34a; }
-.badge-archived   { background: #fef3c7; color: #d97706; }
-.badge-completed  { background: #dcfce7; color: #16a34a; }
-.badge-in_progress { background: #dbeafe; color: #2563eb; }
-.badge-pending    { background: #f1f5f9; color: #64748b; }
+.badge-draft      { background: var(--badge-draft-bg); color: var(--badge-draft-fg); }
+.badge-active     { background: var(--badge-active-bg); color: var(--badge-active-fg); }
+.badge-archived   { background: var(--badge-archived-bg); color: var(--badge-archived-fg); }
+.badge-completed  { background: var(--badge-active-bg); color: var(--badge-active-fg); }
+.badge-in_progress { background: var(--badge-in-progress-bg); color: var(--badge-in-progress-fg); }
+.badge-pending    { background: var(--badge-pending-bg); color: var(--badge-pending-fg); }
 
 /* Page header */
 .page-header {
@@ -282,44 +409,44 @@ table.data-table th {
     font-size: .8rem;
     text-transform: uppercase;
     letter-spacing: .04em;
-    background: #f8fafc;
+    background: var(--table-header-bg);
     position: sticky;
     top: 0;
     z-index: 2;
     box-shadow: 0 1px 0 var(--border);
 }
 table.data-table tr:hover td {
-    background: #f8fafc;
+    background: var(--row-hover-bg);
 }
 table.data-table tbody tr.row-test-data td {
-    background: #fffde7;
+    background: var(--test-row-bg);
 }
 table.data-table tbody tr.row-test-data:hover td {
-    background: #fff9c4;
+    background: var(--test-row-hover-bg);
 }
 #qdb-table tbody tr.row-test-data td {
-    background: #fffde7;
+    background: var(--test-row-bg);
 }
 #qdb-table tbody tr.row-test-data:hover td {
-    background: #fff9c4;
+    background: var(--test-row-hover-bg);
 }
 table.data-table .sticky-col {
     position: sticky;
     left: 0;
     z-index: 1;
     background: var(--surface);
-    box-shadow: 2px 0 4px rgba(0, 0, 0, 0.06);
+    box-shadow: 2px 0 4px var(--sticky-shadow);
 }
 table.data-table thead th.sticky-col {
     z-index: 5;
     top: 0;
-    background: #f8fafc;
+    background: var(--table-header-bg);
 }
 table.data-table tbody tr.row-test-data td.sticky-col {
-    background: #fffde7;
+    background: var(--test-row-bg);
 }
 table.data-table tbody tr.row-test-data:hover td.sticky-col {
-    background: #fff9c4;
+    background: var(--test-row-hover-bg);
 }
 th.sortable { cursor: pointer; user-select: none; }
 th.sortable::after { content: ' \2195'; opacity: .4; }
@@ -344,7 +471,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     cursor: pointer;
     user-select: none;
 }
-.question-header:hover { background: #f8fafc; }
+.question-header:hover { background: var(--row-hover-bg); }
 .drag-handle {
     cursor: grab;
     color: var(--text-secondary);
@@ -359,7 +486,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .question-header .q-type {
     font-size: .8rem;
     color: var(--text-secondary);
-    background: #f1f5f9;
+    background: var(--surface-raised);
     padding: 2px 8px;
     border-radius: 4px;
 }
@@ -392,15 +519,15 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     border: 1px solid var(--border);
     border-radius: 6px;
     margin-bottom: 4px;
-    background: #fafbfc;
+    background: var(--surface-muted);
     font-size: .875rem;
 }
 .option-item .opt-text { flex: 1; }
 .option-item .opt-points {
     font-weight: 600;
-    color: var(--primary);
+    color: var(--primary-text);
     font-size: .8rem;
-    background: #eff6ff;
+    background: var(--primary-subtle);
     padding: 1px 6px;
     border-radius: 4px;
 }
@@ -409,7 +536,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .translations-panel {
     margin-top: 12px;
     padding: 12px;
-    background: #f8fafc;
+    background: var(--surface-muted);
     border-radius: 6px;
     border: 1px solid var(--border);
 }
@@ -454,7 +581,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     outline: none;
     border-color: var(--primary);
     background: var(--surface);
-    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
+    box-shadow: 0 0 0 3px var(--focus-ring);
 }
 
 /* Login */
@@ -498,9 +625,9 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     max-width: 360px;
 }
 .toast.show { opacity: 1; transform: translateX(0); }
-.toast-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
-.toast-error   { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
-.toast-info    { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }
+.toast-success { background: var(--toast-success-bg); color: var(--toast-success-fg); border: 1px solid var(--toast-success-border); }
+.toast-error   { background: var(--toast-error-bg); color: var(--toast-error-fg); border: 1px solid var(--toast-error-border); }
+.toast-info    { background: var(--toast-info-bg); color: var(--toast-info-fg); border: 1px solid var(--toast-info-border); }
 
 /* Filter bar */
 .filter-bar {
@@ -598,10 +725,10 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 }
 
 /* Role badges */
-.badge-admin      { background: #ede9fe; color: #6d28d9; }
-.badge-supervisor { background: #fce7f3; color: #be185d; }
-.badge-coach      { background: #d1fae5; color: #065f46; }
-.badge-you        { background: #dbeafe; color: #1d4ed8; font-size: .7rem; }
+.badge-admin      { background: var(--badge-admin-bg); color: var(--badge-admin-fg); }
+.badge-supervisor { background: var(--badge-supervisor-bg); color: var(--badge-supervisor-fg); }
+.badge-coach      { background: var(--badge-coach-bg); color: var(--badge-coach-fg); }
+.badge-you        { background: var(--badge-you-bg); color: var(--badge-you-fg); font-size: .7rem; }
 
 /* Assignment page layout */
 .assign-layout {
@@ -632,9 +759,9 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     border: 1px solid transparent;
     margin-bottom: 4px;
 }
-.coach-list-item:hover { background: #f1f5f9; }
+.coach-list-item:hover { background: var(--surface-hover); }
 .coach-list-item.active {
-    background: #eff6ff;
+    background: var(--primary-subtle);
     border-color: var(--primary);
 }
 .coach-name { font-weight: 600; font-size: .9rem; }
@@ -650,11 +777,11 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .selection-info {
     margin-top: 10px;
     padding: 8px 12px;
-    background: #eff6ff;
-    border: 1px solid #bfdbfe;
+    background: var(--primary-subtle);
+    border: 1px solid var(--primary-border);
     border-radius: 6px;
     font-size: .875rem;
-    color: #1e40af;
+    color: var(--primary-text);
 }
 
 /* Tabs */
@@ -695,7 +822,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 
 /* Inline form cards (add/edit question, add/edit option) */
 .inline-form-card {
-    background: #f8fafc;
+    background: var(--surface-muted);
     border: 1px solid var(--border);
     border-radius: var(--radius);
     padding: 16px;
@@ -722,7 +849,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .type-select:focus {
     outline: none;
     border-color: var(--primary);
-    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
+    box-shadow: 0 0 0 3px var(--focus-ring);
 }
 
 /* Checkbox label */
@@ -776,8 +903,8 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .opt-branch {
     font-size: .75rem;
     font-weight: 600;
-    color: #7c3aed;
-    background: #ede9fe;
+    color: var(--badge-branch-fg);
+    background: var(--badge-branch-bg);
     padding: 1px 6px;
     border-radius: 4px;
     white-space: nowrap;
@@ -846,13 +973,13 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .trans-select:focus {
     outline: none;
     border-color: var(--primary);
-    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
+    box-shadow: 0 0 0 3px var(--focus-ring);
 }
 .trans-type-select { width: auto; min-width: 140px; flex-shrink: 0; }
 .trans-lang-panel {
     margin-bottom: 16px;
     padding: 12px 14px;
-    background: #f8fafc;
+    background: var(--surface-muted);
     border: 1px solid var(--border);
     border-radius: var(--radius);
 }
@@ -878,7 +1005,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     text-transform: uppercase;
     letter-spacing: .04em;
     color: var(--text-secondary);
-    background: #f1f5f9;
+    background: var(--table-header-bg);
     border: 1px solid var(--border);
     border-bottom: none;
     border-radius: var(--radius) var(--radius) 0 0;
@@ -908,7 +1035,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     color: var(--text-secondary);
     margin: 0 0 8px;
     padding-bottom: 6px;
-    border-bottom: 1px solid #e2e8f0;
+    border-bottom: 1px solid var(--border);
 }
 .trans-groups-wrap .trans-list-header { margin-top: 0; }
 .trans-list-in-group {
@@ -932,10 +1059,10 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     gap: 12px;
     align-items: center;
     padding: 10px 14px;
-    border-bottom: 1px solid #f1f5f9;
+    border-bottom: 1px solid var(--border);
 }
 .trans-list-item:last-child { border-bottom: none; }
-.trans-list-item:hover { background: #f8fafc; }
+.trans-list-item:hover { background: var(--row-hover-bg); }
 .trans-list-item-missing {
     background: var(--trans-missing-bg);
     box-shadow: inset 3px 0 0 var(--trans-missing-accent);
@@ -965,8 +1092,8 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     word-break: break-word;
 }
 .lang-chip-fixed {
-    background: #dbeafe;
-    border-color: #93c5fd;
+    background: var(--lang-chip-fixed-bg);
+    border-color: var(--lang-chip-fixed-border);
 }
 .trans-list-item .trans-cell-input {
     border: 1px solid var(--border);
@@ -1016,7 +1143,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 
 /* ── Language manager ── */
 .lang-manager {
-    background: #f8fafc;
+    background: var(--surface-muted);
     border: 1px solid var(--border);
     border-radius: var(--radius);
     padding: 14px 16px;
@@ -1090,7 +1217,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .trans-search-input:focus {
     outline: none;
     border-color: var(--primary);
-    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
+    box-shadow: 0 0 0 3px var(--focus-ring);
 }
 .trans-filter-types {
     display: flex;
@@ -1112,7 +1239,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .trans-table th {
     position: sticky;
     top: 0;
-    background: #f1f5f9;
+    background: var(--table-header-bg);
     font-weight: 600;
     text-align: left;
     padding: 8px 10px;
@@ -1121,8 +1248,8 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     z-index: 1;
 }
 .trans-table td { padding: 2px 4px; }
-.trans-table tbody tr { border-bottom: 1px solid #f1f5f9; }
-.trans-table tbody tr:hover { background: #f8fafc; }
+.trans-table tbody tr { border-bottom: 1px solid var(--border); }
+.trans-table tbody tr:hover { background: var(--row-hover-bg); }
 .trans-row-hidden { display: none !important; }
 #tabContent-translations .trans-list,
 #tabContent-translations .trans-list-header {
@@ -1153,10 +1280,10 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     text-transform: uppercase;
     letter-spacing: .3px;
 }
-.badge-q   { background: #dbeafe; color: #1e40af; }
-.badge-opt { background: #e2e8f0; color: #475569; }
-.badge-app { background: #d1fae5; color: #065f46; }
-.badge-str { background: #ede9fe; color: #5b21b6; }
+.badge-q   { background: var(--badge-q-bg); color: var(--badge-q-fg); }
+.badge-opt { background: var(--badge-opt-bg); color: var(--badge-opt-fg); }
+.badge-app { background: var(--badge-app-bg); color: var(--badge-app-fg); }
+.badge-str { background: var(--badge-str-bg); color: var(--badge-str-fg); }
 
 .cell-trans { position: relative; }
 .cell-missing { background: var(--trans-missing-bg); }
@@ -1179,7 +1306,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     outline: none;
     border-color: var(--primary);
     background: var(--surface);
-    box-shadow: 0 0 0 2px rgba(37,99,235,.1);
+    box-shadow: 0 0 0 2px var(--focus-ring);
 }
 .trans-cell-input::placeholder {
     color: var(--trans-missing-placeholder);
@@ -1193,7 +1320,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     animation: saveFlash .4s ease;
 }
 @keyframes saveFlash {
-    0%   { background: #dbeafe; }
+    0%   { background: var(--save-flash-bg); }
     100% { background: var(--surface); }
 }
 .trans-list-item .trans-cell-input.save-flash {
@@ -1217,7 +1344,7 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 .trans-progress-bar {
     width: 120px;
     height: 6px;
-    background: #e2e8f0;
+    background: var(--progress-track);
     border-radius: 3px;
     overflow: hidden;
 }
@@ -1240,8 +1367,8 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
 }
 
 .badge-warn {
-    background: #fef3c7;
-    color: #92400e;
+    background: var(--badge-warn-bg);
+    color: var(--badge-warn-fg);
 }
 
 .opt-key {
@@ -1249,3 +1376,25 @@ th.sort-desc::after { content: ' \2193'; opacity: 1; }
     margin-right: 8px;
     color: var(--text-secondary);
 }
+
+/* Callouts */
+.callout-warn {
+    margin-bottom: 16px;
+    padding: 12px;
+    background: var(--badge-warn-bg);
+    border-radius: 8px;
+    color: var(--badge-warn-fg);
+}
+.callout-danger {
+    margin-bottom: 12px;
+    padding: 12px;
+    background: var(--toast-error-bg);
+    border-radius: 8px;
+    color: var(--toast-error-fg);
+}
+input:disabled,
+select:disabled {
+    background: var(--surface-muted);
+    color: var(--text-secondary);
+    cursor: not-allowed;
+}
diff --git a/website/index.html b/website/index.html
index 3463926..3406215 100644
--- a/website/index.html
+++ b/website/index.html
@@ -3,6 +3,8 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="color-scheme" content="dark">
+    <meta name="theme-color" content="#0f1218">
     <title>BW Sch&uuml;tzt - Dashboard</title>
     <link rel="stylesheet" href="css/style.css">
 </head>
diff --git a/website/js/pages/dev.js b/website/js/pages/dev.js
index 5ab7cee..34110fc 100644
--- a/website/js/pages/dev.js
+++ b/website/js/pages/dev.js
@@ -14,7 +14,7 @@ export function devPage() {
             <h1>Dev import</h1>
         </div>
         <div class="card" style="max-width:720px">
-            <p class="field-hint" style="margin-bottom:16px;padding:12px;background:#fff8e1;border-radius:8px;color:#7a5d00">
+            <p class="field-hint callout-warn">
                 <strong>Local / test only.</strong> Imports prefixed dev users (<code>dev_*</code>),
                 clients (<code>DEV-CL-*</code>), and completed questionnaire runs.
                 Existing real users are not modified. Conflicts are skipped (usernames, client codes, completions).
@@ -34,7 +34,7 @@ export function devPage() {
         </div>
         <div class="card" style="max-width:720px;margin-top:16px">
             <h2 style="margin:0 0 8px;font-size:1.1rem">Reset database</h2>
-            <p class="field-hint" style="margin-bottom:12px;padding:12px;background:#fdecea;border-radius:8px;color:#8a1f17">
+            <p class="field-hint callout-danger">
                 <strong>Destructive.</strong> Deletes every client, completion, coach, and supervisor
                 (including non-dev accounts). Admin logins and questionnaire definitions are kept.
             </p>
diff --git a/website/js/pages/editor.js b/website/js/pages/editor.js
index cdf9288..b159499 100644
--- a/website/js/pages/editor.js
+++ b/website/js/pages/editor.js
@@ -745,7 +745,7 @@ function showAddQuestionForm() {
                 <span class="opt-text">${esc(opt.text)}</span>
                 <span class="opt-points">${opt.points} pts</span>
                 ${opt.nextQuestionId ? `<span class="opt-branch">&rarr; ${esc(opt.nextQuestionId)}</span>` : ''}
-                <button class="btn-icon remove-pending-opt" data-idx="${i}" title="Remove" style="color:var(--danger)">&#x2716;</button>
+                <button class="btn-icon btn-icon-danger remove-pending-opt" data-idx="${i}" title="Remove">&#x2716;</button>
             </li>
         `).join('');
         list.querySelectorAll('.remove-pending-opt').forEach(btn => {
@@ -1063,7 +1063,7 @@ function optionItemHTML(q, o, editable) {
             ${o.nextQuestionId ? `<span class="opt-branch">&rarr; ${esc(o.nextQuestionId)}</span>` : ''}
             ${editable ? `
                 <button class="btn-icon edit-opt-btn" data-id="${o.answerOptionID}" title="Edit">&#x270E;</button>
-                <button class="btn-icon del-opt-btn" data-id="${o.answerOptionID}" title="Delete" style="color:var(--danger)">&#x2716;</button>
+                <button class="btn-icon btn-icon-danger del-opt-btn" data-id="${o.answerOptionID}" title="Delete">&#x2716;</button>
             ` : ''}
         </li>
     `;
diff --git a/website/js/pages/users.js b/website/js/pages/users.js
index 196064b..694ab32 100644
--- a/website/js/pages/users.js
+++ b/website/js/pages/users.js
@@ -224,7 +224,7 @@ function showCreateForm() {
                 <div class="form-group" style="flex:1;min-width:160px">
                     <label>Role</label>
                     ${isSupervisor
-                        ? `<input type="text" value="Coach" disabled style="background:#f8fafc">`
+                        ? `<input type="text" value="Coach" disabled>`
                         : `<select id="cu_role">
                             ${allowedRoles.map(r =>
                                 `<option value="${r}">${r.charAt(0).toUpperCase() + r.slice(1)}</option>`
@@ -242,7 +242,7 @@ function showCreateForm() {
             <div id="cu_supervisor_row" class="form-group" style="${isSupervisor ? '' : 'display:none'}">
                 <label>Supervisor</label>
                 ${isSupervisor
-                    ? `<input type="text" value="You (auto-assigned)" disabled style="background:#f8fafc">`
+                    ? `<input type="text" value="You (auto-assigned)" disabled>`
                     : `<select id="cu_supervisor_select">
                         <option value="">— select supervisor —</option>
                         ${supervisorsList.map(s =>