diff --git a/public/js/goals.js b/public/js/goals.js
new file mode 100644
index 0000000..5232b43
--- /dev/null
+++ b/public/js/goals.js
@@ -0,0 +1,93 @@
+import { state } from './state.js';
+import { ldoc } from './i18n.js';
+
+export function tOff(g) {
+  return Math.round((state.TODAY - new Date(g.start)) / 86400000);
+}
+
+export function o2d(g, i) {
+  const d = new Date(new Date(g.start).getTime() + i * 86400000);
+  d.setHours(0,0,0,0);
+  return d;
+}
+
+export function dTot(g, o) {
+  return (g.sets[String(o)] || []).reduce((a, b) => a + b.amount, 0);
+}
+
+export function fd(d) {
+  return d.toLocaleDateString(ldoc(), { weekday: 'short', day: 'numeric', month: 'short' });
+}
+
+export function fs(d) {
+  return d.toLocaleDateString(ldoc(), { day: 'numeric', month: 'short' });
+}
+
+export function editable(g, o) {
+  const t = tOff(g);
+  return o === t || o === t - 1;
+}
+
+export function now() {
+  const n = new Date();
+  return String(n.getHours()).padStart(2, '0') + ':' + String(n.getMinutes()).padStart(2, '0');
+}
+
+export function heuteColor(tdone, daily) {
+  if (tdone === 0) return 'var(--red)';
+  if (tdone >= daily * 1.1) return 'var(--blue)';
+  if (tdone >= daily) return 'var(--green)';
+  return 'var(--amber)';
+}
+
+export function isCollapsed(id) {
+  return state.collapsed[id] !== false;
+}
+
+export function toggleCollapse(id) {
+  const wasCollapsed = isCollapsed(id);
+  state.collapsed[id] = !wasCollapsed;
+  if (wasCollapsed) {
+    const g = state.goals.find(x => x.id === id);
+    if (g) state.selDay[id] = tOff(g);
+  }
+}
+
+export function calc(g) {
+  const t = tOff(g), tot = g.daily * g.days;
+  const dr = Math.max(0, g.days - t - 1);
+  const sd = new Date(g.start); sd.setHours(0,0,0,0);
+  const end = new Date(sd.getTime() + g.days * 86400000);
+  let past = 0;
+  for (let i = 0; i < Math.min(t, g.days); i++) past += dTot(g, i);
+  const tdone = dTot(g, t), tot2 = past + tdone;
+  const dl = dr + 1;
+  const remaining = Math.max(0, tot - past);
+  const pd = Math.ceil(remaining / Math.max(1, dl));
+  const st = Math.max(0, pd - tdone);
+  const expectedPast = Math.min(t, g.days) * g.daily;
+  const buf = Math.floor((past - expectedPast) + Math.max(0, tdone - g.daily));
+  const deficit = Math.min(0, buf);
+  const surplus = Math.max(0, buf);
+  const dailyDelta = pd - g.daily;
+  const pct = Math.min(100, Math.round((tot2 / tot) * 100));
+  return { tot, tOff: t, end, dr, done: tot2, tdone, pd, st, buf, deficit, surplus, dailyDelta, net: tdone - pd, pct, ok: tdone >= pd };
+}
+
+export function dcls(g, i) {
+  const t = tOff(g);
+  if (i > t) return 'dot df';
+  const v = dTot(g, i);
+  const c = v === 0 ? 'dot dm' : v >= g.daily * 1.1 ? 'dot db' : v >= g.daily ? 'dot dd' : 'dot dp';
+  return c + (editable(g, i) ? ' de' : ' dl');
+}
+
+export function dlbl(g, i) {
+  const t = tOff(g);
+  if (i > t) return String(i + 1);
+  const v = dTot(g, i);
+  if (v === 0) return '✕';
+  if (v >= g.daily * 1.1) return '+';
+  if (v >= g.daily) return '✓';
+  return Math.round(v / g.daily * 100) + '%';
+}