:root {
  --bg: #ffffff; --surface-1: #f7f7f8; --surface-2: #ffffff;
  --border: #e2e2e6; --border-strong: #c7c7cf; --border-accent: #5b52d6;
  --text: #1a1a1e; --text-secondary: #52525b; --text-muted: #8a8a94;
  --text-accent: #4a41c9; --text-success: #157a45; --text-danger: #b3261e;
  --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121214; --surface-1: #1c1c1f; --surface-2: #202024;
    --border: #2e2e33; --border-strong: #3f3f46; --border-accent: #9b93f5;
    --text: #f4f4f5; --text-secondary: #d4d4d8; --text-muted: #9797a1;
    --text-accent: #b3ace8; --text-success: #4ade80; --text-danger: #f2b8b5;
  }
}
:root[data-theme="dark"] {
  --bg: #121214; --surface-1: #1c1c1f; --surface-2: #202024;
  --border: #2e2e33; --border-strong: #3f3f46; --border-accent: #9b93f5;
  --text: #f4f4f5; --text-secondary: #d4d4d8; --text-muted: #9797a1;
  --text-accent: #b3ace8; --text-success: #4ade80; --text-danger: #f2b8b5;
}

.cong-1 { background: #EEEDFE; border: 1px solid #534AB7; color: #26215C; }
.cong-2 { background: #E1F5EE; border: 1px solid #0F6E56; color: #04342C; }
.cong-3 { background: #FAECE7; border: 1px solid #993C1D; color: #4A1B0C; }
.cong-4 { background: #FBEAF0; border: 1px solid #993556; color: #4B1528; }
.cong-5 { background: #E6F1FB; border: 1px solid #185FA5; color: #042C53; }
.cong-6 { background: #FAEEDA; border: 1px solid #854F0B; color: #412402; }
.fp-empty { background: var(--surface-1); border: 0.5px dashed var(--border-strong); color: var(--text-muted); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .cong-1 { background: #3C3489; border-color: #AFA9EC; color: #EEEDFE; }
  :root:not([data-theme="light"]) .cong-2 { background: #085041; border-color: #5DCAA5; color: #E1F5EE; }
  :root:not([data-theme="light"]) .cong-3 { background: #712B13; border-color: #F0997B; color: #FAECE7; }
  :root:not([data-theme="light"]) .cong-4 { background: #72243E; border-color: #ED93B1; color: #FBEAF0; }
  :root:not([data-theme="light"]) .cong-5 { background: #0C447C; border-color: #85B7EB; color: #E6F1FB; }
  :root:not([data-theme="light"]) .cong-6 { background: #633806; border-color: #EF9F27; color: #FAEEDA; }
}
:root[data-theme="dark"] .cong-1 { background: #3C3489; border-color: #AFA9EC; color: #EEEDFE; }
:root[data-theme="dark"] .cong-2 { background: #085041; border-color: #5DCAA5; color: #E1F5EE; }
:root[data-theme="dark"] .cong-3 { background: #712B13; border-color: #F0997B; color: #FAECE7; }
:root[data-theme="dark"] .cong-4 { background: #72243E; border-color: #ED93B1; color: #FBEAF0; }
:root[data-theme="dark"] .cong-5 { background: #0C447C; border-color: #85B7EB; color: #E6F1FB; }
:root[data-theme="dark"] .cong-6 { background: #633806; border-color: #EF9F27; color: #FAEEDA; }

* { box-sizing: border-box; }
body {
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0; padding: 0; line-height: 1.5;
}
a { color: var(--text-accent); }
main { max-width: 1000px; margin: 0 auto; padding: 16px 16px 64px; }
main.main-wide { max-width: none; }

.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px; border-bottom: 1px solid var(--border); background: var(--surface-2);
}
.app-brand { font-size: 16px; font-weight: 600; text-decoration: none; color: var(--text); }
.signout-form { display: flex; align-items: center; gap: 10px; }
.app-user { font-size: 13px; color: var(--text-secondary); }
.btn-link { background: none; border: none; color: var(--text-accent); font-size: 13px; cursor: pointer; padding: 0; }
.theme-toggle { padding: 4px 8px; font-size: 14px; line-height: 1; }

button, .btn {
  font-size: 13px; padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface-2); color: var(--text); cursor: pointer; text-decoration: none; display: inline-block;
}
button.primary, .btn.primary { background: var(--border-accent); border-color: var(--border-accent); color: #fff; }
button.danger, .btn.danger { color: var(--text-danger); border-color: var(--text-danger); }

.card { background: var(--surface-2); border: 0.5px solid var(--border); border-radius: 12px; padding: 1rem; }
.room-box { border: 0.5px solid var(--border); border-radius: var(--radius); padding: 8px; font-size: 13px; cursor: pointer; }
.room-box.hidden { opacity: 0.45; text-decoration: line-through; }
.room-hover { box-shadow: 0 0 0 2px var(--border-accent) inset; }

.chip {
  font-size: 12px; padding: 5px 12px; border: 0.5px solid var(--border); border-radius: 999px;
  white-space: nowrap; color: var(--text-secondary); flex-shrink: 0; cursor: pointer;
}
.chip.active { border: 2px solid var(--border-accent); color: var(--text-accent); padding: 4px 11px; }

.day-tabs { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.day-tab {
  font-size: 13px; padding: 4px 10px; border-radius: var(--radius); color: var(--text-muted);
  text-decoration: none; border: 1px solid transparent;
}
.day-tab.active { border: 2px solid var(--border-accent); color: var(--text-accent); }
.week-day-tab { display: inline-block; width: 70px; text-align: center; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }

.legend { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; }
.legend-swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

/* Desktop grid */
.calendar-layout { display: flex; gap: 16px; flex-wrap: wrap; }
.floorplan-panel { width: 160px; flex-shrink: 0; background: var(--surface-1); border-radius: 12px; padding: 12px; }
.floorplan-panel .group-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }
.floorplan-auds { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.floorplan-mrs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.grid-wrap { flex: 1; min-width: 320px; overflow-x: auto; overflow-y: hidden; }
.booking-block {
  font-size: 11px; border-radius: var(--radius); padding: 2px 6px; margin: 1px 2px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; text-align: left;
  border-width: 1px; border-style: solid;
}
.grid-header { font-size: 12px; text-align: center; border-bottom: 0.5px solid var(--border); padding-bottom: 4px; cursor: pointer; }
.grid-group-label { font-size: 12px; color: var(--text-muted); text-align: center; padding-bottom: 4px; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.grid-hour-label { font-size: 11px; color: var(--text-muted); padding-top: 2px; }
.grid-hour-line { border-top: 1px dotted var(--border); height: 0; pointer-events: none; }
.room-col-hidden { display: none !important; }
.grid-add-slot {
  border: 0.5px dashed var(--border-strong); border-radius: var(--radius); font-size: 16px;
  color: var(--text-muted); display: flex; align-items: center; justify-content: center; cursor: pointer;
  opacity: 0; transition: opacity 0.1s;
}
.grid-add-slot:hover { opacity: 1; background: var(--surface-1); }

@media (min-width: 768px) { .mobile-only { display: none !important; } }
@media (max-width: 767.98px) { .desktop-only { display: none !important; } }

/* Mobile agenda */
.mobile-agenda-card { max-width: 480px; background: var(--surface-2); border-radius: 16px; border: 0.5px solid var(--border); padding: 16px; margin: 0 auto; }
.mobile-agenda-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.mobile-agenda-nav a { font-size: 16px; text-decoration: none; }
.mobile-agenda-date { font-size: 15px; font-weight: 500; }
.chips-row { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 10px; margin-bottom: 8px; border-bottom: 0.5px solid var(--border); }
.agenda-row { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 0.5px solid var(--border); }
.agenda-time { font-size: 12px; color: var(--text-secondary); width: 84px; flex-shrink: 0; }
.agenda-bar { width: 4px; height: 30px; border-radius: 2px; border: none !important; flex-shrink: 0; }
.agenda-room { font-size: 12px; color: var(--text-muted); }
.agenda-cong { font-size: 14px; font-weight: 500; }
.agenda-empty { text-align: center; color: var(--text-muted); font-size: 13px; padding: 20px 0; }
.agenda-add { text-align: center; padding: 12px 0; }

/* Popover */
.popover-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.2); z-index: 50; }
.booking-popover {
  position: fixed; z-index: 51; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 16px; min-width: 220px; box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.booking-popover .pop-time { font-size: 12px; color: var(--text-secondary); }
.booking-popover .pop-room { font-size: 12px; color: var(--text-muted); }
.booking-popover .pop-cong { font-size: 15px; font-weight: 600; margin: 4px 0; }
.booking-popover .pop-note { font-size: 12px; color: var(--text-secondary); margin-bottom: 8px; }
.booking-popover .pop-actions { display: flex; gap: 6px; margin-top: 8px; }
.booking-popover .pop-actions form, .booking-popover .pop-actions a { flex: 1; }
.booking-popover .pop-actions button { width: 100%; }
.popover-close { position: absolute; top: 8px; right: 10px; border: none; background: none; font-size: 14px; color: var(--text-muted); cursor: pointer; }

/* Month-jump date picker */
.month-popover {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 51;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; width: 280px; box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.month-popover-header { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 0 24px 10px 0; }
.month-popover-title { font-size: 14px; font-weight: 600; }
.nav-btn {
  display: inline-block; background: none; border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); text-decoration: none; font-size: 18px; line-height: 1; padding: 4px 12px; cursor: pointer;
}
.nav-btn:hover { background: var(--surface-1); }
.month-dow-row { display: grid; grid-template-columns: repeat(7, 1fr); text-align: center; font-size: 11px; color: var(--text-muted); margin-bottom: 4px; }
.month-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; }
.month-day { text-align: center; padding: 6px 0; border-radius: 6px; text-decoration: none; color: var(--text); font-size: 13px; }
.month-day:hover { background: var(--surface-1); }
.month-day.today { border: 1px solid var(--border-accent); }
.month-day.selected { background: var(--border-accent); color: #fff; }
.month-day.empty { visibility: hidden; }

/* Sign-in / not authorized */
.centered-card-page { max-width: 340px; margin: 60px auto; padding: 0 16px; }
.signin-card { background: var(--surface-2); border: 0.5px solid var(--border); border-radius: 16px; padding: 24px 20px; text-align: center; }
.signin-card .app-icon { font-size: 26px; }
.signin-card h1 { font-size: 16px; font-weight: 500; margin: 10px 0 4px; }
.signin-card p { font-size: 13px; color: var(--text-secondary); margin: 0 0 16px; }
.signin-card button { width: 100%; }
.not-authorized-card { text-align: center; }
.not-authorized-card .icon { font-size: 22px; }

/* Forms */
.form-page { max-width: 480px; margin: 0 auto; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 7px 10px; border: 1px solid var(--border-strong); border-radius: var(--radius);
  background: var(--surface-2); color: var(--text); font-size: 14px;
}
.form-row { display: flex; gap: 12px; }
.form-row > .form-group { flex: 1; }
.validation-summary-errors, .field-validation-error { color: var(--text-danger); font-size: 12px; }
.validation-summary-errors ul { margin: 0; padding-left: 18px; }
.mode-toggle { display: flex; gap: 6px; margin-bottom: 16px; }
.mode-toggle button { flex: 1; }
.mode-toggle button.active { border: 2px solid var(--border-accent); color: var(--text-accent); }
.form-actions { display: flex; gap: 8px; margin-top: 18px; }

/* Snapshot */
.snapshot-group-label { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; }
.snapshot-grid { display: grid; gap: 8px; margin-bottom: 14px; max-width: 480px; }
.snapshot-box { border-radius: var(--radius); padding: 10px 8px; font-size: 12px; text-align: center; min-height: 50px; }
.snapshot-box .title { font-weight: 500; }
.snapshot-box .status { font-size: 11px; margin-top: 4px; }
.snapshot-slider { display: flex; align-items: center; gap: 12px; max-width: 420px; }
.snapshot-slider input[type=range] { flex: 1; }
.snapshot-time-out { font-size: 14px; font-weight: 500; min-width: 70px; text-align: right; }