:root {
  --bg: #f7f7f8;
  --panel: #ffffff;
  --border: #e2e2e5;
  --text: #1c1c1e;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --hole: #fecaca;
  --low: #fef9c3;
  --high: #bbf7d0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --panel: #1f2023;
    --border: #33343a;
    --text: #f0f0f2;
    --muted: #9ca0ab;
    --hole: #5b2323;
    --low: #4a441c;
    --high: #1f4a30;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

h1 { font-size: 1.25rem; margin: 0; }

.brand { display: flex; align-items: center; gap: 0.5rem; }
.brand-logo { height: 28px; width: auto; display: block; }
.login-card .brand { justify-content: center; margin-bottom: 0.25rem; }
.login-card .brand-logo { height: 40px; }
h2 { font-size: 1.1rem; margin: 0 0 0.5rem; }

button {
  font: inherit;
  cursor: pointer;
}

.screen { min-height: 100vh; }
[hidden] { display: none !important; }

/* ---------- Login ---------- */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  width: 320px;
  max-width: 92vw;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.login-card label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.login-card input {
  padding: 0.5rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 16px; /* prevents iOS Safari auto-zoom on focus */
}
.login-card button {
  margin-top: 0.4rem;
  padding: 0.6rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-weight: 600;
}
.login-card button:hover { background: var(--accent-hover); }

.error-text {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0;
}

/* ---------- Topbar / nav ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.75rem;
}
.topbar-left { display: flex; align-items: center; gap: 1.5rem; }
.topbar-right { display: flex; align-items: center; gap: 0.75rem; color: var(--muted); font-size: 0.9rem; }

.tabs { display: flex; gap: 0.25rem; }
.tab-btn {
  border: none;
  background: transparent;
  padding: 0.6rem 0.8rem;
  min-height: 40px;
  border-radius: 8px;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}
.tab-btn.active { background: var(--accent); color: white; }
.tab-btn:not(.active):hover { background: var(--bg); }

.link-btn {
  border: none;
  background: none;
  color: var(--accent);
  padding: 0;
}
.primary-btn {
  border: none;
  background: var(--accent);
  color: white;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  font-weight: 600;
}
.primary-btn:hover { background: var(--accent-hover); }
.danger-btn {
  border: none;
  background: none;
  color: var(--danger);
  padding: 0.5rem 0;
  font-weight: 600;
}

/* ---------- Week nav ---------- */
.week-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
}
.week-nav button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  min-height: 40px;
  color: var(--text);
}
.week-nav button:hover { background: var(--bg); }
#week-label { font-weight: 600; }

/* ---------- Section filter pills ---------- */
.pill-bar {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}
.pill-btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  min-height: 38px;
  font-size: 0.85rem;
  font-weight: 500;
}
.pill-btn:hover { background: var(--bg); }
.pill-btn.active { background: var(--accent); border-color: var(--accent); color: white; }

.section-header-row td {
  background: var(--bg);
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  position: sticky;
  left: 0;
}

.shift-section-badge {
  display: inline-block;
  margin-top: 0.15rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- Tab panels ---------- */
.tab-panel { display: none; padding: 0 1.25rem 2rem; }
.tab-panel.active { display: block; }

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
}

table.grid-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 720px;
  font-size: 0.88rem;
}
table.grid-table th, table.grid-table td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.6rem;
  text-align: left;
  vertical-align: top;
}
table.grid-table thead th {
  background: var(--bg);
  position: sticky;
  top: 0;
  font-weight: 600;
}
table.grid-table td.staff-col, table.grid-table th.staff-col {
  position: sticky;
  left: 0;
  background: var(--panel);
  min-width: 150px;
  z-index: 1;
}

#coverage-table td.staff-col, #coverage-table th.staff-col {
  min-width: 60px;
  width: 60px;
  white-space: nowrap;
}

.day-header-date { color: var(--muted); font-weight: 400; font-size: 0.78rem; }

.staff-name-cell { display: flex; align-items: center; gap: 0.5rem; }
.color-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

/* schedule cell */
.shift-cell { min-width: 110px; cursor: pointer; }
.shift-cell:hover { background: var(--bg); }
.shift-cell.empty { color: var(--muted); }
.shift-chip {
  border-radius: 6px;
  padding: 0.25rem 0.4rem;
  font-size: 0.82rem;
  line-height: 1.25;
  color: #1c1c1e;
}
.shift-chip .shift-time { font-weight: 600; }
.shift-chip .shift-pos { font-size: 0.75rem; opacity: 0.8; }
.shift-chip-off {
  background: var(--bg) !important;
  color: var(--muted);
  font-style: italic;
  border: 1px dashed var(--border);
}
.shift-chip-on .shift-time { color: var(--accent); }

/* ---------- Coverage heatmap ---------- */
.coverage-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.coverage-controls select {
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}
.legend { display: flex; align-items: center; gap: 0.4rem; font-size: 0.8rem; color: var(--muted); flex-wrap: wrap; }
.legend-swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; margin-left: 0.6rem; }
.legend-swatch:first-child { margin-left: 0; }
.legend-swatch.hole { background: var(--hole); }
.legend-swatch.low { background: var(--low); }
.legend-swatch.high { background: var(--high); }

table.heatmap td { text-align: center; font-weight: 600; min-width: 44px; }
table.heatmap td.count-0 { background: var(--hole); }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.modal-backdrop[hidden] { display: none; }
.modal-card {
  background: var(--panel);
  border-radius: 12px;
  padding: 1.5rem;
  width: 340px;
  max-width: 92vw;
  max-height: 90vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.modal-card label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.modal-card input[type="text"], .modal-card input[type="time"],
.modal-card input[type="number"], .modal-card select {
  padding: 0.45rem 0.55rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 16px; /* prevents iOS Safari auto-zoom on focus */
}
.modal-sub { color: var(--muted); font-size: 0.85rem; margin: -0.5rem 0 0; }
.row-2 { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.row-2 label { flex: 1; min-width: 120px; }
.checkbox-row { flex-direction: row !important; align-items: center; gap: 0.5rem !important; }
.modal-actions { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.4rem; }
.spacer { flex: 1; }

.staff-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.staff-toolbar label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.staff-toolbar select {
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}

/* staff table */
#staff-table td button {
  margin-right: 0.4rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 6px;
}

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  .topbar {
    padding: 0.6rem 0.75rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
  .topbar-left {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    width: 100%;
  }
  .topbar-right {
    width: 100%;
    justify-content: space-between;
    order: 3;
  }
  .brand { justify-content: center; }
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    width: 100%;
    scrollbar-width: none;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .tab-btn { padding: 0.6rem 0.9rem; }

  .week-nav {
    flex-wrap: wrap;
    justify-content: center;
    padding: 0.6rem 0.75rem;
    gap: 0.5rem;
  }
  .week-nav button { flex: 0 0 auto; }
  #week-label { flex: 1 1 100%; text-align: center; order: -1; }

  .tab-panel { padding: 0 0.6rem 2rem; }

  .coverage-controls { justify-content: flex-start; }
  .coverage-controls label { flex: 1 1 auto; }

  table.grid-table { font-size: 0.82rem; }
  table.grid-table th, table.grid-table td { padding: 0.4rem 0.5rem; }

  .modal-card { padding: 1.1rem; width: 92vw; }
  .row-2 { flex-direction: column; }
  .row-2 label { min-width: 0; }

  #shift-type-pills .pill-btn { flex: 1 1 auto; text-align: center; }
}