:root {
  --navy: #0b2545;
  --navy2: #133056;
  --teal: #1b8a80;
  --gold: #c4a35a;
  --off: #f6f4ef;
  --white: #fff;
  --text: #1a2332;
  --muted: #5b6573;
  --line: #d5dce6;
  --green: #157a4b;
  --red: #9b2c2c;
  --mine: #1b8a80;
  --busy: #0b2545;
  --free: #ffffff;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(11, 37, 69, 0.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Segoe UI", Calibri, system-ui, sans-serif;
  background: var(--off);
  color: var(--text);
}
button, input, select { font: inherit; }
.hidden { display: none !important; }

.login {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(1200px 500px at 10% -10%, #1b8a80 0%, transparent 50%), var(--navy);
}
.login-card {
  width: min(420px, 100%);
  background: var(--white);
  border-radius: 20px;
  padding: 28px 24px 24px;
  box-shadow: var(--shadow);
}
.login-card h1 { margin: 0 0 8px; font-size: 24px; color: var(--navy); }
.login-card p { margin: 0 0 20px; color: var(--muted); line-height: 1.45; }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 6px; }
input, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fff;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 650;
}
.btn-primary { background: var(--teal); color: #fff; width: 100%; margin-top: 18px; }
.btn-ghost { background: transparent; color: var(--navy); }
.btn-danger { background: #fde8e8; color: var(--red); }
.auth-switch { width: 100%; margin-top: 10px; font-weight: 600; color: var(--teal); }
.hint { font-size: 12px; color: var(--muted); margin-top: 16px; line-height: 1.4; }
.error { color: var(--red); font-size: 13px; margin-top: 8px; min-height: 1.2em; }

.top {
  position: sticky; top: 0; z-index: 20;
  background: var(--navy); color: #fff;
  padding: 12px 16px 10px;
}
.top-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.top h2 { margin: 0; font-size: 16px; font-weight: 650; }
.top small { color: #c9d3e0; }
.user-chip { font-size: 12px; color: var(--gold); text-align: right; }
.window-bar {
  margin-top: 10px; font-size: 12px; color: #d5dce6;
}

.dates {
  display: flex; gap: 8px; overflow-x: auto; padding: 12px 16px 4px;
  -webkit-overflow-scrolling: touch;
}
.date-btn {
  flex: 0 0 auto;
  min-width: 64px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  padding: 8px 10px;
  text-align: center;
  cursor: pointer;
}
.date-btn .dow { display: block; font-size: 11px; color: var(--muted); text-transform: lowercase; }
.date-btn .num { display: block; font-size: 18px; font-weight: 700; color: var(--navy); }
.date-btn.active { background: var(--navy); border-color: var(--navy); }
.date-btn.active .dow, .date-btn.active .num { color: #fff; }
.date-btn.week-split { box-shadow: inset 3px 0 0 var(--gold); }

.legend {
  display: flex; gap: 14px; flex-wrap: wrap;
  padding: 4px 16px 12px; font-size: 12px; color: var(--muted);
}
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 4px; vertical-align: middle; }
.dot.free { background: #fff; border: 1px solid var(--navy); }
.dot.busy { background: var(--navy); }
.dot.mine { background: var(--teal); }
.dot.assigned { background: #e8eef6; border: 1px solid var(--navy); }

.floor-wrap { padding: 0 12px 24px; }
.floor-scroll {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: #fff;
}
.floor {
  position: relative;
  width: max(100%, 980px);
  aspect-ratio: 16 / 9;
  min-height: 0;
  background: #fff;
  overflow: hidden;
}
.room {
  position: absolute;
  border: 2px solid var(--navy);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 11px;
  font-weight: 650;
  color: var(--navy);
  background: #fff;
  padding: 4px;
  pointer-events: none;
  line-height: 1.2;
}
.room-v {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.04em;
}
.room-window { font-weight: 700; letter-spacing: 0.18em; }
.weekday {
  position: absolute;
  right: 1.2%;
  top: 44%;
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  pointer-events: none;
}

.desk {
  position: absolute;
  border: 2px solid var(--navy);
  border-radius: 2px;
  cursor: pointer;
  padding: 6px 8px;
  color: var(--navy);
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
}
.desk.free { border-color: var(--teal); background: #f3fbf9; }
.desk.busy { border-color: var(--navy); background: var(--navy); color: #fff; }
.desk.mine { border-color: #0e6b63; background: var(--teal); color: #fff; }
.desk.assigned { border-color: var(--navy); background: #eef3f9; color: var(--navy); }
.desk.mine.assigned { border-color: #0e6b63; background: var(--teal); color: #fff; }
.desk .code { display: block; font-size: 10px; font-weight: 700; opacity: 0.7; line-height: 1.1; }
.desk .who { display: block; font-size: 13px; font-weight: 650; line-height: 1.2; padding: 2px 0 0; }
.desk .sub { display: block; font-size: 11px; opacity: 0.75; }

.sheet-back {
  position: fixed; inset: 0; background: rgba(11,37,69,.4); z-index: 30;
  display: flex; align-items: flex-end; justify-content: center;
}
.sheet {
  width: min(520px, 100%);
  background: #fff;
  border-radius: 20px 20px 0 0;
  padding: 18px 18px 28px;
  max-height: 80dvh;
  overflow: auto;
}
.sheet h3 { margin: 0 0 4px; }
.sheet .meta { color: var(--muted); font-size: 14px; line-height: 1.45; }
.sheet .row { margin-top: 14px; display: flex; gap: 8px; }
.sheet .row .btn { flex: 1; }

.tabs { display: flex; gap: 6px; padding: 0 16px; }
.tab {
  border: 0; background: transparent; color: var(--muted); padding: 10px 4px; cursor: pointer;
  border-bottom: 2px solid transparent;
}
.tab.on { color: var(--navy); border-color: var(--teal); font-weight: 650; }

.list { padding: 8px 16px 32px; display: grid; gap: 8px; }
.card {
  background: #fff; border-radius: 14px; padding: 12px 14px; box-shadow: var(--shadow);
}
.card b { display: block; }
.card span { color: var(--muted); font-size: 13px; }

.admin-form { padding: 8px 16px 32px; display: grid; gap: 10px; }
.admin-form .btn-primary { width: auto; margin: 0; }

@media (min-width: 860px) {
  .layout { max-width: 1400px; margin: 0 auto; }
  .sheet-back { align-items: center; }
  .sheet { border-radius: 20px; }
  .floor { width: 100%; }
  .desk .who { font-size: 14px; }
  .room { font-size: 12px; }
}
@media (min-width: 1200px) {
  .login-card { width: min(460px, 100%); }
}