:root {
  --bg: #fbfaf8;
  --surface: #fff;
  --text: #1b1a17;
  --muted: #6b6760;
  --line: #e3dfd8;
  --accent: #2f6f4e;
  --accent-soft: #e6f0ea;
  --danger: #a33a2c;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17181a;
    --surface: #202225;
    --text: #ecebe8;
    --muted: #9a968e;
    --line: #34363a;
    --accent: #6cc295;
    --accent-soft: #24352d;
    --danger: #e08376;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
  padding-top: calc(32px + env(safe-area-inset-top, 0px));
  padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px));
}

h1 { font-size: 1.5rem; margin: 0 0 8px; letter-spacing: -0.01em; }
.lede { color: var(--muted); margin: 0 0 28px; max-width: 46ch; }
.hint { color: var(--muted); font-size: 0.9rem; margin: 0 0 12px; }
.opt { color: var(--muted); font-weight: 400; }

label {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 6px;
}

input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
input[type="text"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.code-input {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 1.25rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  border-radius: 8px;
}

form button {
  margin-top: 12px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
}

button.primary {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 10px 18px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) button.primary { color: #10231a; }
}

button.link {
  background: none;
  border: none;
  color: var(--muted);
  text-decoration: underline;
  padding: 10px 4px;
}
button.link.danger { color: var(--danger); }

button:disabled { opacity: 0.55; cursor: default; }

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 28px 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.error {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  border-radius: 8px;
  padding: 10px 12px;
  margin-top: 16px;
}

/* --- group header --- */

.group-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.code-line { margin: 0; color: var(--muted); font-size: 0.9rem; }

.code-chip {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 1rem;
  letter-spacing: 0.14em;
  background: var(--accent-soft);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 3px 10px;
}

.copy-status {
  margin-left: 8px;
  color: var(--accent);
  font-size: 0.85rem;
  word-break: break-all;
}

.tabs-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}

.tabs {
  display: flex;
  gap: 4px;
}
.tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 10px 14px;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: -1px;
}
.tab[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }

.switch-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 10px 4px;
  margin-bottom: -1px;
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}

.switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 21px;
  flex: none;
}
.switch input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}
.switch .slider {
  position: absolute;
  inset: 0;
  background: var(--line);
  border-radius: 999px;
  transition: background 0.15s ease;
}
.switch .slider::before {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  left: 3px;
  top: 3px;
  background: var(--surface);
  border-radius: 50%;
  transition: transform 0.15s ease;
}
.switch input:checked + .slider { background: var(--accent); }
.switch input:checked + .slider::before { transform: translateX(15px); }
.switch input:focus-visible + .slider { outline: 2px solid var(--accent); outline-offset: 2px; }

.me-form { margin-bottom: 20px; max-width: 320px; }

.actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.status { color: var(--muted); font-size: 0.85rem; }

/* --- grid --- */

/* The whole 24h grid is sized to fit on screen without its own scrollbar, so a
   touch drag can paint without ever competing with a scroll gesture. */
.grid-wrap {
  --cell: 26px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.grid {
  display: grid;
  grid-template-columns: 50px repeat(7, minmax(34px, 1fr));
  min-width: 300px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.grid .head {
  border-bottom: 1px solid var(--line);
  font-size: 0.78rem;
  font-weight: 600;
  text-align: center;
  padding: 7px 2px;
}

.grid .hour {
  border-right: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
  padding: 0 6px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: var(--cell);
}

.grid .cell {
  height: var(--cell);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
}
.grid .cell.day-6 { border-right: none; }

/* Heatmap steps, from nobody to everyone. */
.grid .cell[data-level="1"] { background: color-mix(in srgb, var(--accent) 18%, transparent); }
.grid .cell[data-level="2"] { background: color-mix(in srgb, var(--accent) 38%, transparent); }
.grid .cell[data-level="3"] { background: color-mix(in srgb, var(--accent) 58%, transparent); }
.grid .cell[data-level="4"] { background: color-mix(in srgb, var(--accent) 78%, transparent); }
.grid .cell[data-level="5"] { background: var(--accent); }

.grid .cell.on { background: var(--accent); }

@media (max-width: 560px) {
  .grid-wrap { --cell: 22px; }
  .grid { grid-template-columns: 42px repeat(7, minmax(30px, 1fr)); }
}

/* --- best times --- */

#best { margin-top: 24px; }
#best h2 { font-size: 1rem; margin: 0 0 10px; }

.best-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  margin-bottom: 8px;
}
.best-when { font-weight: 600; font-variant-numeric: tabular-nums; }
.best-who { color: var(--muted); font-size: 0.85rem; }
.best-row.full { border-color: var(--accent); background: var(--accent-soft); }
.best-row.full .best-who { color: var(--accent); font-weight: 600; }

.empty { color: var(--muted); }