Initial release: collaborative trip planner

Multi-user trip planning web app in a single Docker container. Mullvad-style token accounts, trip sharing via join codes, day-by-day calendar with typed entries (activity, hotel, travel, flight, rental car, immigration, note), multi-leg flight segments with bundled IATA airport dataset, Leaflet/OSM map with per-leg great-circle km (air vs ground), rough km-driven vs rental included-km comparison, cost splitting with settle-up suggestions, flip-clock departure countdown. Node 20 + Express + SQLite (WAL, additive migrations), vanilla JS SPA, 44 API tests.

public/css/flipclock.css

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+/* Split-flap flip-clock countdown. Cards stay dark in the light theme — that
+   is the airport/clock aesthetic. */
+
+.countdown-section {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.4rem 0 0.2rem;
+}
+.countdown-caption {
+  font-size: 0.72rem;
+  text-transform: uppercase;
+  letter-spacing: 0.18em;
+  color: var(--text-muted);
+}
+
+.flipclock {
+  --w: 46px;
+  --h: 66px;
+  --fs: 46px;
+  display: flex;
+  align-items: flex-start;
+  gap: 0.5rem;
+}
+.fc-group { display: flex; flex-direction: column; align-items: center; gap: 0.35rem; }
+.fc-digits { display: flex; gap: 3px; }
+.fc-label {
+  font-size: 0.62rem;
+  text-transform: uppercase;
+  letter-spacing: 0.12em;
+  color: var(--text-faint);
+}
+.fc-sep {
+  font-size: calc(var(--fs) * 0.7);
+  font-weight: 800;
+  color: var(--text-faint);
+  line-height: var(--h);
+  align-self: flex-start;
+}
+
+/* One flip card = two static halves + two animating flip halves. */
+.fc-card {
+  position: relative;
+  width: var(--w);
+  height: var(--h);
+  perspective: 320px;
+  filter: drop-shadow(0 3px 5px rgba(15, 23, 42, 0.28));
+}
+.fc-face {
+  position: absolute;
+  left: 0;
+  right: 0;
+  height: calc(var(--h) / 2);
+  overflow: hidden;
+  background: #1e2430;
+}
+.fc-face b {
+  position: absolute;
+  left: 0;
+  right: 0;
+  height: var(--h);
+  line-height: var(--h);
+  text-align: center;
+  font-size: var(--fs);
+  font-weight: 700;
+  color: #f1f5f9;
+  font-variant-numeric: tabular-nums;
+}
+.fc-top { top: 0; border-radius: 7px 7px 0 0; border-bottom: 1px solid rgba(0, 0, 0, 0.45); }
+.fc-top b { top: 0; }
+.fc-bottom { bottom: 0; border-radius: 0 0 7px 7px; }
+.fc-bottom b { bottom: 0; }
+
+.fc-flip { display: none; backface-visibility: hidden; }
+.fc-flip-top { top: 0; border-radius: 7px 7px 0 0; border-bottom: 1px solid rgba(0, 0, 0, 0.45); transform-origin: bottom; }
+.fc-flip-top b { top: 0; }
+.fc-flip-bottom { bottom: 0; border-radius: 0 0 7px 7px; transform-origin: top; transform: rotateX(90deg); }
+.fc-flip-bottom b { bottom: 0; }
+
+.fc-flipping .fc-flip { display: block; }
+.fc-flipping .fc-flip-top { animation: fc-top 0.28s ease-in forwards; }
+.fc-flipping .fc-flip-bottom { animation: fc-bottom 0.28s ease-in 0.28s forwards; }
+@keyframes fc-top { to { transform: rotateX(-90deg); } }
+@keyframes fc-bottom { from { transform: rotateX(90deg); } to { transform: rotateX(0deg); } }
+
+@media (prefers-reduced-motion: reduce) {
+  .fc-flipping .fc-flip-top,
+  .fc-flipping .fc-flip-bottom { animation: none; }
+  .fc-flip { display: none !important; }
+}
+
+/* Ongoing / completed badge (no clock) */
+.countdown-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.5rem 1rem;
+  border-radius: 999px;
+  font-weight: 700;
+  font-size: 1rem;
+}
+.countdown-badge.ongoing { background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff; }
+.countdown-badge.done { background: var(--surface-2); color: var(--text-muted); border: 1px solid var(--border); }
+.cd-badge-icon { font-size: 1.1rem; }
+
+/* Responsive: shrink digits on narrow screens */
+@media (max-width: 640px) {
+  .flipclock { --w: 34px; --h: 50px; --fs: 34px; gap: 0.35rem; }
+}
+@media (max-width: 380px) {
+  .flipclock { --w: 26px; --h: 40px; --fs: 26px; }
+}