diff --git a/static/app.css b/static/app.css
index 60003fb..f33e8d4 100644
--- a/static/app.css
+++ b/static/app.css
@@ -1,129 +1,268 @@
-/* zeitkort-web — deliberately plain. Light + dark (follows the browser). */
+/* zeitkort-web — styled to match fló.fo. Light + tokyo (dark), follows system. */
 
-:root {
-  color-scheme: light dark;
-  --bg: #fff;
-  --fg: #000;
-  --muted: #777;
-  --border: #999;
-  --border-soft: #ccc;
-  --dotted: #ccc;
-  --field-bg: #fff;
-  --field-border: #888;
-  --btn-bg: #eee;
-  --btn-bg-hover: #ddd;
-  --btn-border: #555;
-  --header-border: #000;
-  --th-bg: #f0f0f0;
-  --row-active: #ffd;
-  --link: #003;
-  --accent-bg: #e3ecff;
-  --accent-border: #357;
-  --notice-fg: #060; --notice-bg: #efe; --notice-border: #060;
-  --error-fg: #a00; --error-bg: #fee; --error-border: #a00;
-  --go-bg: #e7f5e7; --go-border: #2a8a2a; --go-bg-hover: #d6eed6;
-  --stop-bg: #fbe4e4; --stop-border: #a00; --stop-bg-hover: #f6d2d2;
-  --card-bg: #fff; --card-border: #a00;
-  --danger-btn-bg: #fee; --danger-btn-bg-hover: #fdd;
-  --backdrop: rgba(0, 0, 0, .35);
-  --shadow: rgba(0, 0, 0, .4);
+*, *::before, *::after { box-sizing: border-box; }
+
+:root,
+[data-theme="light"] {
+  --bg: #f4f1ec;
+  --fg: #1a1d22;
+  --muted: #595f68;
+  --dim: #9299a2;
+  --border: rgba(26, 29, 34, 0.12);
+  --border-soft: rgba(26, 29, 34, 0.06);
+  --dotted: rgba(26, 29, 34, 0.12);
+  --field-bg: rgba(26, 29, 34, 0.03);
+  --field-border: rgba(26, 29, 34, 0.18);
+  --btn-bg: rgba(26, 29, 34, 0.05);
+  --btn-bg-hover: rgba(26, 29, 34, 0.09);
+  --btn-border: rgba(26, 29, 34, 0.18);
+  --header-border: rgba(26, 29, 34, 0.12);
+  --th-bg: rgba(26, 29, 34, 0.04);
+  --row-active: rgba(44, 90, 122, 0.06);
+  --link: #2c5a7a;
+  --accent: #2c5a7a;
+  --accent-bg: rgba(44, 90, 122, 0.07);
+  --accent-border: #2c5a7a;
+  --nav-bg: rgba(244, 241, 236, 0.6);
+  --bg-panel: rgba(255, 253, 250, 0.72);
+
+  --notice-fg: #2a6e2a; --notice-bg: rgba(42, 110, 42, 0.06); --notice-border: rgba(42, 110, 42, 0.25);
+  --error-fg: #a03030;  --error-bg: rgba(160, 48, 48, 0.06);  --error-border: rgba(160, 48, 48, 0.25);
+  --go-bg: rgba(42, 110, 42, 0.06); --go-border: rgba(42, 110, 42, 0.3); --go-bg-hover: rgba(42, 110, 42, 0.1);
+  --stop-bg: rgba(160, 48, 48, 0.06); --stop-border: rgba(160, 48, 48, 0.3); --stop-bg-hover: rgba(160, 48, 48, 0.1);
+  --card-bg: #fff; --card-border: rgba(160, 48, 48, 0.3);
+  --danger-btn-bg: rgba(160, 48, 48, 0.06); --danger-btn-bg-hover: rgba(160, 48, 48, 0.12);
+  --backdrop: rgba(0, 0, 0, 0.3);
+  --shadow: rgba(0, 0, 0, 0.12);
+
+  /* Theme toggle pill */
+  --toggle-bg: linear-gradient(135deg, #07070d 0%, #64dcff 100%);
+  --toggle-border: rgba(26, 29, 34, 0.2);
+  --toggle-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
 }
 
-@media (prefers-color-scheme: dark) {
-  :root {
-    --bg: #1d1f21;
-    --fg: #e6e6e6;
-    --muted: #9aa0a6;
-    --border: #555;
-    --border-soft: #3a3d40;
-    --dotted: #3a3d40;
-    --field-bg: #2a2d30;
-    --field-border: #5a5e62;
-    --btn-bg: #34383c;
-    --btn-bg-hover: #3f4348;
-    --btn-border: #6a6e72;
-    --header-border: #6a6e72;
-    --th-bg: #2a2d30;
-    --row-active: #3a3a20;
-    --link: #9bbcff;
-    --accent-bg: #21344f;
-    --accent-border: #5a86c0;
-    --notice-fg: #8fe08f; --notice-bg: #142a14; --notice-border: #3f7a3f;
-    --error-fg: #ff9b9b; --error-bg: #3a1616; --error-border: #a85050;
-    --go-bg: #1f3a1f; --go-border: #4caf4c; --go-bg-hover: #264826;
-    --stop-bg: #3a1a1a; --stop-border: #cc5555; --stop-bg-hover: #4a2222;
-    --card-bg: #26292c; --card-border: #cc5555;
-    --danger-btn-bg: #3a1a1a; --danger-btn-bg-hover: #4a2222;
-    --backdrop: rgba(0, 0, 0, .6);
-    --shadow: rgba(0, 0, 0, .75);
-  }
+[data-theme="tokyo"] {
+  --bg: #07070d;
+  --fg: #e8f4ff;
+  --muted: #a3b3cc;
+  --dim: #7886a0;
+  --border: rgba(100, 220, 255, 0.12);
+  --border-soft: rgba(100, 220, 255, 0.06);
+  --dotted: rgba(100, 220, 255, 0.1);
+  --field-bg: rgba(100, 220, 255, 0.04);
+  --field-border: rgba(100, 220, 255, 0.15);
+  --btn-bg: rgba(100, 220, 255, 0.06);
+  --btn-bg-hover: rgba(100, 220, 255, 0.1);
+  --btn-border: rgba(100, 220, 255, 0.18);
+  --header-border: rgba(100, 220, 255, 0.12);
+  --th-bg: rgba(100, 220, 255, 0.04);
+  --row-active: rgba(100, 220, 255, 0.06);
+  --link: #64dcff;
+  --accent: #64dcff;
+  --accent-bg: rgba(100, 220, 255, 0.06);
+  --accent-border: #64dcff;
+  --nav-bg: rgba(7, 7, 13, 0.65);
+  --bg-panel: rgba(15, 16, 28, 0.72);
+
+  --notice-fg: #8fe08f; --notice-bg: rgba(143, 224, 143, 0.06); --notice-border: rgba(143, 224, 143, 0.25);
+  --error-fg: #ff9b9b;  --error-bg: rgba(255, 155, 155, 0.06);  --error-border: rgba(255, 155, 155, 0.2);
+  --go-bg: rgba(80, 200, 80, 0.08); --go-border: rgba(80, 200, 80, 0.3); --go-bg-hover: rgba(80, 200, 80, 0.14);
+  --stop-bg: rgba(200, 80, 80, 0.08); --stop-border: rgba(200, 80, 80, 0.3); --stop-bg-hover: rgba(200, 80, 80, 0.14);
+  --card-bg: #0f1018; --card-border: rgba(200, 80, 80, 0.4);
+  --danger-btn-bg: rgba(200, 80, 80, 0.1); --danger-btn-bg-hover: rgba(200, 80, 80, 0.18);
+  --backdrop: rgba(0, 0, 0, 0.55);
+  --shadow: rgba(0, 0, 0, 0.5);
+
+  --toggle-bg: #f4f1ec;
+  --toggle-border: rgba(100, 220, 255, 0.4);
+  --toggle-shadow: 0 0 10px rgba(100, 220, 255, 0.5), 0 0 25px rgba(100, 220, 255, 0.3);
 }
 
-* { box-sizing: border-box; }
 html, body { max-width: 100%; overflow-x: hidden; }
 body {
-  font-family: -apple-system, Helvetica, Arial, sans-serif;
-  font-size: 15px;
-  line-height: 1.4;
+  font-family: 'JetBrains Mono', monospace;
+  font-size: 0.88rem;
+  font-weight: 300;
+  line-height: 1.55;
   color: var(--fg);
   background: var(--bg);
   margin: 0;
   padding: 0;
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+  transition: background 0.3s ease, color 0.3s ease;
 }
 
-/* Long, unbreakable names must never widen the page on mobile. */
-main { overflow-wrap: break-word; padding: 16px; max-width: 1040px; margin: 0 auto; }
+main { overflow-wrap: break-word; padding: 16px; max-width: 1040px; margin: 0 auto; width: 100%; flex: 1; }
 input, select, textarea { max-width: 100%; }
 .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
 
+/* ---- Header / nav ---- */
 header {
-  border-bottom: 2px solid var(--header-border);
-  padding: 8px 16px;
+  border-bottom: 1px solid var(--header-border);
+  padding: 1rem 1.5rem;
   display: flex;
-  align-items: baseline;
-  gap: 20px;
+  align-items: center;
+  gap: 1.2rem;
+  background: var(--nav-bg);
+  backdrop-filter: blur(12px) saturate(120%);
+  -webkit-backdrop-filter: blur(12px) saturate(120%);
+  position: sticky;
+  top: 0;
+  z-index: 20;
+  transition: background 0.3s ease;
 }
-.brand { font-weight: bold; font-size: 18px; }
-nav a { margin-right: 14px; text-decoration: none; color: var(--link); }
-nav a:hover { text-decoration: underline; }
-footer { padding: 12px 16px; color: var(--muted); font-size: 12px; border-top: 1px solid var(--border-soft); margin-top: 24px; }
 
-h2 { margin: 0 0 12px; }
+.back-link {
+  font-family: 'JetBrains Mono', monospace;
+  font-weight: 400;
+  font-size: 0.7rem;
+  letter-spacing: 0.15em;
+  text-transform: uppercase;
+  white-space: nowrap;
+  color: var(--muted);
+  text-decoration: none;
+  padding: 0.35rem 0.6rem;
+  border: 1px solid var(--border);
+  border-radius: 2px;
+  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
+}
+.back-link:hover {
+  color: var(--fg);
+  border-color: var(--muted);
+  background: var(--bg-panel);
+}
 
-fieldset { border: 1px solid var(--border); margin: 0 0 14px; padding: 10px 12px; min-width: 0; }
-legend { font-weight: bold; padding: 0 4px; }
+.brand {
+  font-weight: 700;
+  font-size: 1rem;
+  letter-spacing: -0.02em;
+  color: var(--fg);
+  text-decoration: none;
+  display: inline-flex;
+  align-items: baseline;
+  gap: 0.35rem;
+  white-space: nowrap;
+}
+.brand:hover { color: var(--accent); }
+
+.brand-sep {
+  font-weight: 300;
+  color: var(--dim);
+}
+.brand-sub {
+  font-weight: 400;
+  font-size: 0.78rem;
+  letter-spacing: 0.18em;
+  text-transform: uppercase;
+  color: var(--muted);
+}
+
+[data-theme="tokyo"] .brand {
+  color: #e8f4ff;
+  text-shadow: 0 0 8px rgba(100, 220, 255, 0.3);
+}
+
+nav a {
+  margin-right: 0.9rem;
+  text-decoration: none;
+  color: var(--muted);
+  font-size: 0.72rem;
+  font-weight: 400;
+  letter-spacing: 0.15em;
+  text-transform: uppercase;
+  padding: 0.35rem 0;
+  border-bottom: 1px solid transparent;
+  transition: color 0.2s ease, border-color 0.2s ease;
+}
+nav a:hover { color: var(--fg); border-bottom-color: transparent; }
+
+footer {
+  padding: 0.9rem 1.5rem;
+  color: var(--muted);
+  font-size: 0.68rem;
+  letter-spacing: 0.05em;
+  border-top: 1px solid var(--border-soft);
+  background: var(--nav-bg);
+  backdrop-filter: blur(12px);
+  -webkit-backdrop-filter: blur(12px);
+}
+
+h2 {
+  margin: 0 0 0.9rem;
+  font-family: 'JetBrains Mono', monospace;
+  font-weight: 700;
+  font-size: 1.1rem;
+  letter-spacing: -0.02em;
+}
+
+[data-theme="tokyo"] h2 {
+  text-shadow: 0 0 10px rgba(100, 220, 255, 0.2);
+}
+
+/* ---- Forms ---- */
+fieldset {
+  border: 1px solid var(--border);
+  margin: 0 0 14px;
+  padding: 10px 12px;
+  min-width: 0;
+  border-radius: 3px;
+  background: var(--field-bg);
+  transition: border-color 0.3s ease, background 0.3s ease;
+}
+legend {
+  font-weight: 500;
+  padding: 0 6px;
+  font-size: 0.78rem;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  color: var(--muted);
+}
 
 select, input[type=text], input[type=number], input:not([type]), textarea {
   font: inherit;
-  padding: 3px 5px;
+  font-size: 0.85rem;
+  padding: 0.35rem 0.55rem;
   border: 1px solid var(--field-border);
+  border-radius: 3px;
   background: var(--field-bg);
   color: var(--fg);
+  transition: border-color 0.2s;
+  outline: none;
+}
+select:focus, input[type=text]:focus, input[type=number]:focus, input:not([type]):focus, textarea:focus {
+  border-color: var(--accent);
 }
 textarea { width: 100%; max-width: 460px; }
-label { display: inline-block; }
+label { display: inline-block; font-size: 0.85rem; }
 
 button {
   font: inherit;
-  padding: 3px 10px;
+  font-size: 0.82rem;
+  font-weight: 500;
+  padding: 0.3rem 0.7rem;
   border: 1px solid var(--btn-border);
+  border-radius: 3px;
   background: var(--btn-bg);
   color: var(--fg);
   cursor: pointer;
+  letter-spacing: 0.02em;
+  transition: background 0.15s, border-color 0.15s;
 }
 button:hover { background: var(--btn-bg-hover); }
 
-.muted { color: var(--muted); font-size: 13px; }
-.error { color: var(--error-fg); border: 1px solid var(--error-border); padding: 6px 10px; background: var(--error-bg); }
-.notice { color: var(--notice-fg); border: 1px solid var(--notice-border); padding: 6px 10px; background: var(--notice-bg); }
+.muted { color: var(--muted); font-size: 0.78rem; }
+.error { color: var(--error-fg); border: 1px solid var(--error-border); padding: 6px 10px; background: var(--error-bg); border-radius: 3px; }
+.notice { color: var(--notice-fg); border: 1px solid var(--notice-border); padding: 6px 10px; background: var(--notice-bg); border-radius: 3px; }
 
 .columns { display: flex; gap: 16px; flex-wrap: wrap; }
 .col { flex: 1 1 340px; min-width: 0; }
 
-.task { padding: 4px 0; border-bottom: 1px dotted var(--dotted); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
+.task { padding: 5px 0; border-bottom: 1px dotted var(--dotted); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
 .task .pick { flex: 1 1 140px; min-width: 0; }
 
-button.go { font-weight: bold; min-width: 84px; }
+button.go { font-weight: 700; min-width: 84px; letter-spacing: 0.04em; }
 button.go:not(.stop):not([disabled]) { background: var(--go-bg); border-color: var(--go-border); }
 button.go:not(.stop):not([disabled]):hover { background: var(--go-bg-hover); }
 button.go.stop { background: var(--stop-bg); border-color: var(--stop-border); }
@@ -134,21 +273,24 @@ button.go[disabled] { opacity: .45; cursor: not-allowed; }
 fieldset > .inline { margin-top: 10px; }
 .add-toggle { margin-top: 10px; }
 
-.clock { font-family: monospace; font-size: 26px; font-weight: bold; margin: 0; }
+.clock { font-family: 'JetBrains Mono', monospace; font-size: 1.5rem; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
 
 /* Sticky bar shown only while a timer runs. */
 .running-bar {
   position: sticky;
-  top: 0;
-  z-index: 50;
+  top: 52px;   /* below the header */
+  z-index: 15;
   display: flex;
   align-items: center;
   gap: 14px;
   flex-wrap: wrap;
   background: var(--go-bg);
   border: 1px solid var(--go-border);
+  border-radius: 3px;
   padding: 8px 12px;
   margin: 0 0 14px;
+  backdrop-filter: blur(8px);
+  -webkit-backdrop-filter: blur(8px);
 }
 .rb-task { flex: 1 1 auto; }
 .running-bar .go { margin-left: auto; }
@@ -157,33 +299,39 @@ fieldset > .inline { margin-top: 10px; }
   display: inline-block;
   min-width: 84px;
   text-align: center;
-  font-weight: bold;
+  font-weight: 700;
   padding: 4px 10px;
   border: 1px solid var(--go-border);
+  border-radius: 3px;
   background: var(--go-bg);
   color: var(--fg);
+  font-size: 0.78rem;
+  letter-spacing: 0.04em;
 }
 
+/* ---- Tables ---- */
 table { border-collapse: collapse; width: 100%; }
-th, td { border: 1px solid var(--border-soft); padding: 3px 6px; text-align: left; font-size: 13px; vertical-align: top; }
-th { background: var(--th-bg); }
+th, td { border: 1px solid var(--border-soft); padding: 0.3rem 0.5rem; text-align: left; font-size: 0.78rem; vertical-align: top; }
+th { background: var(--th-bg); font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase; font-size: 0.7rem; color: var(--muted); }
 tr.active { background: var(--row-active); }
 .row-actions { white-space: nowrap; }
-.row-actions button { padding: 1px 6px; font-size: 12px; }
+.row-actions button { padding: 1px 6px; font-size: 0.72rem; }
 
 .line { display: flex; gap: 6px; margin: 4px 0; flex-wrap: wrap; }
 .line input { width: 110px; }
 .line input[name=extra_desc] { width: 220px; }
 
-/* Two-tap delete confirm — a centered card, always fully on-screen (mobile-safe).
-   No native dialog and no JS, so it works in Brave/Chrome/Safari alike. */
+/* ---- Two-tap delete confirm ---- */
 details.confirm { display: inline-block; }
 details.confirm > summary {
   list-style: none;
   cursor: pointer;
   font: inherit;
-  padding: 3px 10px;
+  font-size: 0.82rem;
+  font-weight: 500;
+  padding: 0.3rem 0.7rem;
   border: 1px solid var(--btn-border);
+  border-radius: 3px;
   background: var(--btn-bg);
   color: var(--fg);
   display: inline-block;
@@ -193,7 +341,6 @@ details.confirm > summary::marker { content: ""; }
 details.confirm > summary:hover { background: var(--btn-bg-hover); }
 details.confirm[open] > summary { background: var(--stop-bg); border-color: var(--stop-border); }
 
-/* Dim the page behind the open confirm card. */
 details.confirm[open]::before {
   content: "";
   position: fixed;
@@ -209,71 +356,113 @@ details.confirm[open]::before {
   transform: translate(-50%, -50%);
   z-index: 1000;
   width: min(360px, 92vw);
-  padding: 16px 18px;
+  padding: 1.2rem 1.4rem;
   border: 1px solid var(--card-border);
+  border-radius: 3px;
   background: var(--card-bg);
   color: var(--fg);
   white-space: normal;
-  box-shadow: 0 6px 30px var(--shadow);
-  font-size: 14px;
-  line-height: 1.45;
+  box-shadow: 0 8px 30px var(--shadow);
+  font-size: 0.85rem;
+  line-height: 1.55;
   text-align: left;
 }
 .confirm-pop button { margin-top: 12px; margin-right: 6px; }
 .confirm-pop button:not(.cancel) { border-color: var(--stop-border); background: var(--danger-btn-bg); }
 .confirm-pop button:not(.cancel):hover { background: var(--danger-btn-bg-hover); }
 
-.row-actions details.confirm > summary { padding: 1px 6px; font-size: 12px; }
+.row-actions details.confirm > summary { padding: 1px 6px; font-size: 0.72rem; }
 
-/* Very visible countdown for the proof-of-concept reset. */
+/* ---- POC reset banner ---- */
 .reset-banner {
   position: sticky;
-  top: 0;
-  z-index: 80;
+  top: 52px;
+  z-index: 18;
   display: flex;
   align-items: center;
   justify-content: center;
   gap: 10px;
   flex-wrap: wrap;
-  padding: 10px 16px;
-  border-bottom: 3px solid var(--error-border);
+  padding: 8px 16px;
+  border-bottom: 1px solid var(--error-border);
   background: var(--error-bg);
   color: var(--error-fg);
   text-align: center;
+  backdrop-filter: blur(8px);
+  -webkit-backdrop-filter: blur(8px);
 }
 .reset-label {
-  font-weight: bold;
+  font-weight: 500;
   text-transform: uppercase;
-  letter-spacing: .04em;
+  letter-spacing: 0.12em;
+  font-size: 0.72rem;
 }
 .reset-countdown {
-  font-family: monospace;
-  font-size: clamp(34px, 8vw, 64px);
-  font-weight: 900;
+  font-family: 'JetBrains Mono', monospace;
+  font-size: clamp(1.5rem, 6vw, 2.5rem);
+  font-weight: 700;
   line-height: 1;
   padding: 2px 10px;
-  border: 2px solid currentColor;
+  border: 1px solid currentColor;
+  border-radius: 3px;
   background: var(--bg);
 }
 .reset-note {
   flex-basis: 100%;
-  font-size: 13px;
-  font-weight: bold;
+  font-size: 0.72rem;
+  font-weight: 500;
+  letter-spacing: 0.04em;
 }
 .reset-imminent .reset-banner {
-  outline: 4px solid var(--error-border);
-  outline-offset: -4px;
+  outline: 2px solid var(--error-border);
+  outline-offset: -2px;
 }
 
 .about-card {
   max-width: 760px;
   border: 1px solid var(--border);
+  border-radius: 3px;
   background: var(--field-bg);
-  padding: 12px 14px;
+  padding: 1.2rem 1.4rem;
+  line-height: 1.75;
 }
+.about-card p { margin-bottom: 0.6rem; }
+
 .poc-warning {
   border: 1px solid var(--error-border);
+  border-radius: 3px;
   background: var(--error-bg);
   color: var(--error-fg);
   padding: 8px 10px;
+  margin-top: 0.8rem;
+}
+
+/* ---- Theme toggle ---- */
+.theme-toggle {
+  position: fixed;
+  bottom: 1.5rem;
+  right: 1.5rem;
+  width: 28px;
+  height: 28px;
+  border-radius: 50%;
+  border: 1px solid var(--toggle-border);
+  cursor: pointer;
+  padding: 0;
+  z-index: 30;
+  transition: all 0.3s ease;
+  box-shadow: var(--toggle-shadow);
+  background: var(--toggle-bg);
+}
+.theme-toggle:hover { transform: scale(1.08); }
+
+@media (max-width: 640px) {
+  header { padding: 0.7rem 0.9rem; gap: 0.6rem; }
+  .back-link { font-size: 0.58rem; padding: 0.25rem 0.4rem; letter-spacing: 0.08em; }
+  .brand { font-size: 0.9rem; }
+  nav a { font-size: 0.62rem; margin-right: 0.6rem; letter-spacing: 0.08em; }
+  footer { font-size: 0.62rem; padding: 0.7rem 0.9rem; }
+  main { padding: 12px; }
+  .theme-toggle { width: 20px; height: 20px; bottom: 1rem; right: 0.9rem; }
+  .reset-banner { top: 44px; }
+  .running-bar { top: 44px; }
 }
diff --git a/templates/page.html b/templates/page.html
index 00119dc..2785635 100644
--- a/templates/page.html
+++ b/templates/page.html
@@ -3,12 +3,25 @@
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<title>zeitkort</title>
+<title>zeitkort — FLÓ</title>
+
+<script>
+(function () {
+  var stored = localStorage.getItem('poc-theme');
+  var theme = stored || (window.matchMedia('(prefers-color-scheme: dark)').matches ? 'tokyo' : 'light');
+  document.documentElement.setAttribute('data-theme', theme);
+})();
+</script>
+
+<link rel="preconnect" href="https://fonts.googleapis.com">
+<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&display=swap" rel="stylesheet">
 <link rel="stylesheet" href="/static/app.css">
 </head>
 <body>
 <header>
-  <span class="brand">zeitkort</span>
+  <a href="https://fló.fo" class="back-link">← FLÓ.FO</a>
+  <span class="brand">FLÓ <span class="brand-sep">/</span> <span class="brand-sub">ZEITKORT</span></span>
   <nav>
     <a href="/">Timer</a>
     <a hx-get="/settings" hx-target="#main" href="javascript:void(0)">Settings</a>
@@ -28,7 +41,30 @@
 
 <footer>zeitkort-web {{.Version}} · web-only POC · resets every 10 minutes</footer>
 
+<button class="theme-toggle" id="theme-toggle" aria-label="Toggle theme"></button>
+
 <script src="/static/htmx.min.js"></script>
 <script src="/static/timer.js"></script>
+<script>
+(function () {
+  function currentSystemTheme() {
+    return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'tokyo' : 'light';
+  }
+  var btn = document.getElementById('theme-toggle');
+  if (btn) {
+    btn.addEventListener('click', function () {
+      var current = document.documentElement.getAttribute('data-theme') || 'light';
+      var next = current === 'light' ? 'tokyo' : 'light';
+      document.documentElement.setAttribute('data-theme', next);
+      localStorage.setItem('poc-theme', next);
+    });
+  }
+  window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function () {
+    if (!localStorage.getItem('poc-theme')) {
+      document.documentElement.setAttribute('data-theme', currentSystemTheme());
+    }
+  });
+})();
+</script>
 </body>
 </html>{{end}}