:root {
  --bg: #f5f6f4;
  --surface: #ffffff;
  --surface-2: #eef0ec;
  --border: #dcdfd8;
  --text: #1c211f;
  --muted: #5f6a65;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #d5efeb;
  --taken: #e6e2dc;
  --taken-ink: #6b625a;
  --mine: #fde7c2;
  --mine-ink: #7a4b00;
  --danger: #b42318;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(0 0 0 / .05), 0 4px 16px rgb(0 0 0 / .05);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111513;
    --surface: #1a1f1d;
    --surface-2: #232a27;
    --border: #2f3834;
    --text: #e8ece9;
    --muted: #9aa6a0;
    --accent: #2dd4bf;
    --accent-ink: #062b27;
    --accent-soft: #123b36;
    --taken: #2d2a27;
    --taken-ink: #b5aaa0;
    --mine: #3d2e12;
    --mine-ink: #f8cf85;
    --danger: #f97066;
    --shadow: 0 1px 2px rgb(0 0 0 / .4);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 var(--font);
  padding-bottom: 120px;
}
[hidden] { display: none !important; }
h1, h2 { margin: 0; line-height: 1.2; }
button { font: inherit; color: inherit; }
.muted { color: var(--muted); }

/* --- top bar --------------------------------------------------------------------------------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; max-width: 960px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; letter-spacing: -.01em; }
.usernav { display: flex; align-items: center; gap: 12px; font-size: .9rem; }
.whoami { color: var(--muted); }
.whoami strong { color: var(--text); }

main { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.loading { color: var(--muted); text-align: center; padding: 48px 0; }

/* --- buttons --------------------------------------------------------------------------------- */
.btn {
  border: 1px solid transparent; border-radius: 10px; padding: 9px 16px; cursor: pointer;
  font-weight: 600; font-size: .95rem; transition: background .15s, border-color .15s, opacity .15s;
}
.btn:disabled { opacity: .55; cursor: default; }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn.ghost { background: transparent; border-color: var(--border); }
.btn.ghost:hover:not(:disabled) { background: var(--surface-2); }
.btn.danger { background: transparent; border-color: var(--border); color: var(--danger); padding: 6px 12px; font-size: .85rem; }
.btn.danger:hover:not(:disabled) { border-color: var(--danger); }
.btn.wide { width: 100%; padding: 11px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* --- auth ------------------------------------------------------------------------------------ */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.auth { max-width: 400px; margin: 32px auto; padding: 28px 24px; }
.auth h1 { font-size: 1.5rem; margin-bottom: 4px; }
.auth > .muted { margin: 0 0 20px; }
.tabs { display: grid; grid-template-columns: 1fr 1fr; background: var(--surface-2); border-radius: 10px; padding: 4px; margin-bottom: 20px; }
.tabs button { border: 0; background: transparent; padding: 8px; border-radius: 7px; cursor: pointer; font-weight: 600; color: var(--muted); }
.tabs button[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.form { display: grid; gap: 14px; }
.form label { display: grid; gap: 6px; font-weight: 600; font-size: .9rem; }
.form small { font-weight: 400; }
.form input {
  font: inherit; padding: 10px 12px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); width: 100%;
}
.form input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.form[data-mode="login"] .reg-only { display: none; }
.error { color: var(--danger); margin: 0; min-height: 1.2em; font-size: .9rem; }

/* --- steps ----------------------------------------------------------------------------------- */
.step { margin: 24px 0 32px; }
.step h2 { font-size: 1rem; display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.num {
  display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%;
  background: var(--accent); color: var(--accent-ink); font-size: .8rem; font-weight: 700;
}
.hint { margin: -4px 0 12px; font-size: .9rem; }

/* dates */
.dates {
  display: flex; gap: 8px; overflow-x: auto; padding: 2px 2px 8px; scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.date {
  flex: 0 0 auto; width: 64px; padding: 8px 4px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface); cursor: pointer; text-align: center; scroll-snap-align: start;
  display: grid; gap: 1px;
}
.date .dow { font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; }
.date .dnum { font-size: 1.3rem; font-weight: 700; }
.date .mon { font-size: .75rem; color: var(--muted); }
.date.weekend .dow { color: var(--mine-ink); }
.date:hover { border-color: var(--accent); }
.date[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.date[aria-selected="true"] .dow, .date[aria-selected="true"] .mon { color: inherit; opacity: .85; }

/* desks — three in a line */
.desks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.desk {
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
  padding: 14px 12px 12px; cursor: pointer; text-align: left; display: grid; gap: 8px;
  box-shadow: var(--shadow); transition: border-color .15s, transform .15s;
}
.desk:hover { border-color: var(--accent); }
.desk[aria-selected="true"] { border-color: var(--accent); outline: 2px solid var(--accent); outline-offset: -1px; }
.desk svg { width: 100%; height: auto; max-height: 90px; }
.desk .desk-top { fill: var(--surface-2); stroke: var(--border); stroke-width: 1.5; }
.desk .monitor, .desk .keyboard, .desk .mouse { fill: var(--muted); opacity: .55; }
.desk .chair { fill: var(--border); }
.desk[aria-selected="true"] .desk-top { fill: var(--accent-soft); stroke: var(--accent); }
.desk[aria-selected="true"] .chair { fill: var(--accent); }
.desk.busy-now .chair { fill: var(--taken-ink); }
.desk-name { font-weight: 700; }
.desk-status { font-size: .82rem; color: var(--muted); min-height: 2.4em; }
.timeline { position: relative; height: 6px; border-radius: 3px; background: var(--accent-soft); overflow: hidden; }
.timeline i { position: absolute; top: 0; bottom: 0; background: var(--taken-ink); opacity: .55; }
.timeline i.mine { background: var(--mine-ink); opacity: .8; }
.timeline .past { position: absolute; left: 0; top: 0; bottom: 0; background: var(--surface-2); opacity: .9; }

/* slots */
.slots { display: grid; gap: 14px; }
.block-title { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); font-weight: 700; margin-bottom: 6px; }
.slot-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 4px; }
.slot {
  border: 1px solid var(--border); background: var(--surface); border-radius: 7px; padding: 8px 0;
  font-size: .8rem; font-variant-numeric: tabular-nums; cursor: pointer; text-align: center; min-width: 0;
}
.slot:hover:not(:disabled) { border-color: var(--accent); }
.slot.sel { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 700; }
.slot.in-range { background: var(--accent-soft); border-color: var(--accent); }
.slot.taken {
  background: repeating-linear-gradient(135deg, var(--taken), var(--taken) 4px, transparent 4px, transparent 8px), var(--surface-2);
  color: var(--taken-ink); cursor: not-allowed; border-color: transparent;
}
.slot.mine { background: var(--mine); color: var(--mine-ink); border-color: transparent; cursor: not-allowed; }
.slot.elsewhere { opacity: .45; cursor: not-allowed; border-style: dashed; }
.slot.past { opacity: .35; cursor: not-allowed; }
.slot:disabled { pointer-events: auto; }

.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 12px; font-size: .8rem; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 14px; height: 14px; border-radius: 4px; border: 1px solid var(--border); display: inline-block; background: var(--surface); }
.sw.sel { background: var(--accent); border-color: var(--accent); }
.sw.taken { background: repeating-linear-gradient(135deg, var(--taken), var(--taken) 3px, var(--surface-2) 3px, var(--surface-2) 6px); border-color: transparent; }
.sw.mine { background: var(--mine); border-color: transparent; }

.desklist, .mine { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 6px; }
.desklist li { font-size: .9rem; display: flex; gap: 10px; color: var(--muted); }
.desklist li .t { font-variant-numeric: tabular-nums; color: var(--text); font-weight: 600; min-width: 112px; }
.mine li {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px;
}
.mine .what { display: grid; }
.mine .what strong { font-variant-numeric: tabular-nums; }
.mine .what span { font-size: .85rem; color: var(--muted); }
.mine .empty { background: transparent; border-style: dashed; color: var(--muted); justify-content: center; }

/* confirm bar */
.confirmbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  background: var(--surface); border-top: 1px solid var(--border); box-shadow: 0 -4px 20px rgb(0 0 0 / .08);
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
}
.confirm-inner { max-width: 960px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.summary { font-weight: 600; }
.summary small { display: block; font-weight: 400; color: var(--muted); }
.confirm-actions { display: flex; gap: 8px; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 96px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-size: .9rem;
  transition: opacity .2s, transform .2s; z-index: 20; max-width: calc(100vw - 32px);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: var(--danger); color: #fff; }

@media (max-width: 720px) {
  .slot-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .whoami { display: none; }
  .desks { gap: 8px; }
  .desk { padding: 10px 8px; }
  .desk-status { font-size: .75rem; }
}
@media (max-width: 380px) {
  .slot { font-size: .72rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}