:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #16181d;
  --muted: #6b7280;
  --line: #e3e6ea;
  --accent: #2f5fd8;
  --person: #2f7a4f;
  --person-soft: #d8efe1;
  --online: #b06d1a;
  --online-soft: #fbeacd;
  --error: #b3261e;
  --radius: 10px;
}

* { box-sizing: border-box; }

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

h1, h2 { margin: 0 0 .25rem; font-weight: 600; }
h1 { font-size: 1.35rem; }
h2 { font-size: 1.05rem; }

.muted { color: var(--muted); }
.small { font-size: .85rem; }
.big { font-size: 1.25rem; font-weight: 600; margin: .25rem 0; }
.error {
  background: #fdeceb; color: var(--error);
  padding: .5rem .7rem; border-radius: 6px; margin: 0 0 .5rem;
}

/* ---------- layout ---------- */

.centered {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
}

.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: .8rem 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.topbar .muted { margin-left: .6rem; font-size: .9rem; }
.topbar-right { display: flex; align-items: center; gap: .8rem; }

.banner { border-left: 3px solid var(--accent); }
.row { display: flex; gap: .6rem; align-items: center; margin-top: .75rem; }

/* ---------- form ---------- */

.login { width: min(360px, 100%); }
.login label {
  display: block;
  margin: .8rem 0 .25rem;
  font-size: .85rem;
  font-weight: 500;
}
input[type="email"], input[type="password"] {
  width: 100%;
  padding: .55rem .65rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 1rem;
  background: #fff;
  color: inherit;
}
input:focus-visible, .cell:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button {
  font: inherit;
  padding: .5rem .9rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.login button { width: 100%; margin-top: 1.1rem; }
button.link {
  background: none;
  color: var(--muted);
  padding: 0;
  text-decoration: underline;
}

/* ---------- grid ---------- */

.grid-scroll { overflow-x: auto; margin: .9rem 0 .3rem; }

.grid { border-collapse: collapse; width: 100%; min-width: 560px; }
.grid th {
  font-weight: 500;
  font-size: .85rem;
  padding: .35rem .25rem;
  text-align: center;
}
.grid th.hour {
  text-align: right;
  padding-right: .6rem;
  color: var(--muted);
  white-space: nowrap;
}
.grid th.today { color: var(--accent); font-weight: 600; }
.grid th.weekend, .grid td.weekend { background: #fafbfc; }
.grid td { padding: 2px; }

.cell {
  width: 100%;
  min-width: 52px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #fff;
  color: var(--muted);
  font-size: .8rem;
  transition: background .12s, border-color .12s;
}
.cell:hover { border-color: var(--accent); }
.cell[data-mine="person"] {
  background: var(--person-soft);
  border-color: var(--person);
  color: var(--person);
  font-weight: 600;
}
.cell[data-mine="online"] {
  background: var(--online-soft);
  border-color: var(--online);
  color: var(--online);
  font-weight: 600;
}
.cell.saving { opacity: .5; }

.legend { display: flex; align-items: center; gap: .45rem; font-size: .85rem; color: var(--muted); }
.legend .swatch {
  width: 13px; height: 13px;
  border-radius: 3px;
  border: 1px solid var(--line);
  display: inline-block;
}
.legend .swatch + * { margin-right: .7rem; }
.swatch.person { background: var(--person-soft); border-color: var(--person); }
.swatch.online { background: var(--online-soft); border-color: var(--online); }
.swatch.none { background: #fff; }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card: #1c1f25;
    --ink: #e8eaed;
    --muted: #9aa1ac;
    --line: #2c313a;
    --accent: #7aa2f7;
    --person: #6cc493;
    --person-soft: #1e3a2c;
    --online: #d8a657;
    --online-soft: #3a2f1a;
    --error: #f2836b;
  }
  input[type="email"], input[type="password"], .cell { background: #22262d; }
  .grid th.weekend, .grid td.weekend { background: #1a1d22; }
  .swatch.none { background: #22262d; }
  .error { background: #3a1f1c; }
  button { color: #10131a; }
  button.link { color: var(--muted); }
}

h3 { margin: 0 0 .25rem; font-size: .95rem; font-weight: 600; }
.rule { border: 0; border-top: 1px solid var(--line); margin: 1.1rem 0 .9rem; }

.day {
  background: none;
  border: 0;
  padding: .2rem .3rem;
  border-radius: 5px;
  color: inherit;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
.day:hover { background: var(--line); }

.centre { text-align: center; margin: .9rem 0 0; }
a { color: var(--accent); }