/* Layout: a narrow, centered form on the create page; on the event page two
   availability grids side by side (yours, the group's) that stack on phones. */
:root {
  --bg: #f4f6f5;
  --surface: #ffffff;
  --fg: #1a2024;
  --muted: #5f6b71;
  --line: #d8dee1;
  --line-strong: #b9c3c8;
  --accent: #0e6f63;
  --accent-ink: #ffffff;
  --accent-soft: #d8efe9;
  --heat: 14, 111, 99;         /* rgb triplet for the heatmap alpha ramp */
  --void: repeating-linear-gradient(45deg, transparent 0 4px, rgba(0,0,0,.06) 4px 5px);
  --danger: #b4482e;
  --focus: #2b7cd3;
  --shadow: 0 1px 2px rgba(20, 30, 35, .06), 0 8px 24px -12px rgba(20, 30, 35, .18);
  --font: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181b; --surface: #1c2226; --fg: #e7ebed; --muted: #98a4aa;
    --line: #2d3539; --line-strong: #46525a; --accent: #4cc5b2; --accent-ink: #0e1a18;
    --accent-soft: #173b36; --heat: 76, 197, 178;
    --void: repeating-linear-gradient(45deg, transparent 0 4px, rgba(255,255,255,.07) 4px 5px);
    --danger: #e0785c; --focus: #6aa8ea;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14181b; --surface: #1c2226; --fg: #e7ebed; --muted: #98a4aa;
  --line: #2d3539; --line-strong: #46525a; --accent: #4cc5b2; --accent-ink: #0e1a18;
  --accent-soft: #173b36; --heat: 76, 197, 178;
  --void: repeating-linear-gradient(45deg, transparent 0 4px, rgba(255,255,255,.07) 4px 5px);
  --danger: #e0785c; --focus: #6aa8ea;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
  padding: 0 16px;
  min-height: 100vh;
}
h1, h2, h3 { margin: 0; line-height: 1.2; text-wrap: balance; font-weight: 600; }
h1 { font-size: 1.75rem; letter-spacing: -0.01em; }
h2 { font-size: 1.05rem; }
p { margin: 0; }
a { color: var(--accent); }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
[hidden] { display: none !important; }

.wrap { max-width: 1200px; margin: 0 auto; padding-block: 24px 48px; }
.wrap.narrow { max-width: 640px; }

.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: inherit; font-weight: 600; letter-spacing: -0.01em;
}
.brand-mark {
  width: 26px; height: 26px; border-radius: 7px;
  background:
    linear-gradient(135deg, rgba(var(--heat), .35) 0 50%, transparent 50%),
    linear-gradient(45deg, rgba(var(--heat), .95) 0 50%, rgba(var(--heat), .55) 50%);
}
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 28px; }
.eyebrow { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.stack { display: grid; gap: 18px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.field { display: grid; gap: 6px; }
.field > label, .legend { font-weight: 600; font-size: .9rem; }
.hint { font-size: .82rem; color: var(--muted); }

input[type="text"], select {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  min-width: 0;
}
input[type="text"]::placeholder { color: var(--muted); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 14px; border-radius: 8px; border: 1px solid var(--line-strong);
  background: var(--surface); cursor: pointer; font-weight: 600; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.quiet { border-color: transparent; background: transparent; color: var(--muted); font-weight: 500; }
.btn.quiet:hover { color: var(--fg); border-color: var(--line); }
.btn.danger { color: var(--danger); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.sm { padding: 5px 10px; font-size: .85rem; }

/* segmented control */
.seg { display: inline-flex; width: fit-content; justify-self: start; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.seg button { padding: 7px 12px; border: 0; background: transparent; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line-strong); }
.seg button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

/* ---------- create page ---------- */
.calendar { display: grid; gap: 8px; }
.cal-head { display: flex; justify-content: space-between; align-items: center; }
.cal-head strong { font-variant-numeric: tabular-nums; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal-grid .dow { text-align: center; font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; padding-bottom: 2px; }
.cal-grid button {
  height: 40px; border: 1px solid transparent; border-radius: 7px; background: transparent;
  cursor: pointer; font-variant-numeric: tabular-nums; min-width: 0;
}
.cal-grid button:hover { border-color: var(--line-strong); }
.cal-grid button.other { color: var(--muted); opacity: .5; }
.cal-grid button.today { text-decoration: underline; text-underline-offset: 3px; }
.cal-grid button.past { color: var(--muted); opacity: .45; }
.cal-grid button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button { padding: 7px 12px; border-radius: 999px; border: 1px solid var(--line-strong); background: transparent; cursor: pointer; }
.chips button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: start; }
@media (max-width: 480px) { .two { grid-template-columns: 1fr; } }
.selected-summary { font-size: .85rem; color: var(--muted); min-height: 1.3em; }
.error { color: var(--danger); font-size: .9rem; }

/* ---------- event page ---------- */
.event-head { display: grid; gap: 10px; margin-bottom: 20px; }
.event-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; color: var(--muted); font-size: .9rem; }
.event-meta select { width: auto; padding: 5px 8px; font-size: .9rem; max-width: 100%; }
.share { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.share code {
  font: .85rem/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface);
  overflow-wrap: anywhere; max-width: 100%;
}

.panels { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 900px) { .panels { grid-template-columns: minmax(0, 1fr); } }
.panel { padding: 16px; display: grid; gap: 14px; min-width: 0; }
.panel-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.status { font-size: .82rem; color: var(--muted); min-height: 1.2em; }
.status.saving { color: var(--accent); }

.name-row { display: flex; gap: 8px; }
.name-row input { flex: 1; }

/* Availability grid */
.grid-scroll { overflow-x: auto; padding-bottom: 4px; }
.grid {
  display: grid;
  gap: 0;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  font-variant-numeric: tabular-nums;
  width: max-content;
  min-width: 100%;
}
.grid .col-head { text-align: center; padding: 0 4px 6px; line-height: 1.15; }
.grid .col-head .dow { font-size: .75rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.grid .col-head .day { font-size: .9rem; font-weight: 600; }
.grid .time {
  font-size: .72rem; color: var(--muted); text-align: right; padding-right: 8px;
  position: relative; top: -0.6em; white-space: nowrap;
}
.grid .cell {
  height: var(--cell-h, 18px); min-width: 44px;
  border-right: 1px solid var(--line);
  border-bottom: 1px dashed var(--line);
  background: var(--surface);
  cursor: pointer;
}
.grid .cell.first-col { border-left: 1px solid var(--line); }
.grid .cell.hour { border-bottom-style: solid; }
.grid .cell.top { border-top: 1px solid var(--line-strong); }
.grid .cell.void { background: var(--void); cursor: default; pointer-events: none; }
.grid.editable .cell:hover { box-shadow: inset 0 0 0 2px var(--line-strong); }
.grid .cell.on { background: var(--accent); }
.grid .cell.paint-add { background: rgba(var(--heat), .55); }
.grid .cell.paint-remove { background: rgba(var(--heat), .18); }
.grid.readonly .cell { cursor: crosshair; }
.grid.readonly .cell.heat { background: rgba(var(--heat), var(--a, 0)); }
.grid.readonly .cell:hover, .grid.readonly .cell.peek { box-shadow: inset 0 0 0 2px var(--fg); }

.legend-row { display: flex; align-items: center; gap: 8px; font-size: .8rem; color: var(--muted); flex-wrap: wrap; }
.ramp { display: inline-flex; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.ramp span { width: 18px; height: 12px; display: block; background: rgba(var(--heat), var(--a)); }

.hover-info { display: grid; gap: 6px; min-height: 68px; padding: 10px 12px; border: 1px dashed var(--line-strong); border-radius: 8px; font-size: .9rem; }
.hover-info strong { font-variant-numeric: tabular-nums; }
.names { display: flex; flex-wrap: wrap; gap: 4px 10px; }
.names .no { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--line-strong); }

.people { display: flex; flex-wrap: wrap; gap: 6px; }
.people button {
  padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line-strong);
  background: transparent; cursor: pointer; font-size: .85rem;
}
.people button[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.people button.me { font-weight: 600; }

.best { display: grid; gap: 2px; }
.best-item { display: flex; justify-content: space-between; gap: 10px; font-size: .9rem; padding: 6px 0; border-bottom: 1px solid var(--line); }
.best-item:last-child { border-bottom: 0; }
.best-item .count { font-variant-numeric: tabular-nums; color: var(--accent); font-weight: 600; white-space: nowrap; }

.empty { color: var(--muted); font-size: .9rem; }
.footer { margin-top: 32px; font-size: .82rem; color: var(--muted); }

@media (prefers-reduced-motion: no-preference) {
  .btn, .cal-grid button, .chips button, .people button { transition: background-color .12s, border-color .12s, color .12s; }
}