:root {
  --accent: #005588; /* SLUH Blue */
  --accent-rgb: 0, 85, 136;
  --cell: 16px;
  --gap: 3px;
}

:root,
[data-theme="dark"] {
  --bg: #0b0b0d;
  --panel: #17181c;
  --border: #232429;
  --track: #1c1d21;
  --text: #e7e7ea;
  --text-dim: #6c6d74;
  --done: #35363d;
  --today-upcoming: #1e1f24;
  --overlay-bg: rgba(0, 0, 0, 0.55);
  color-scheme: dark;
}

/* SLUH brand palette: Navy #003366 (anchor -> text), Blue #005588 (accent),
   Spirit Blue #88ccec, Dark Gray #777777, Light Gray #eeeeee, Warm Gray #ccccbb */
[data-theme="light"] {
  --bg: #ffffff;
  --panel: #ffffff;
  --border: #dcdcd6;
  --track: #eeeeee;
  --text: #003366;
  --text-dim: #777777;
  --done: #ccccbb;
  --today-upcoming: #eeeeee;
  --overlay-bg: rgba(0, 51, 102, 0.35);
  color-scheme: light;
}

* { box-sizing: border-box; }

html {
  /* keep the scrollbar gutter reserved always, so switching to a tab with
     less content (and no scrollbar) doesn't shift the whole centered
     layout sideways */
  overflow-y: scroll;
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 0 1.5rem 2.5rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem 0 0.5rem;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text);
}

.header-controls {
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  appearance: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  line-height: 1;
}
.icon-btn:hover { color: var(--text); border-color: var(--text-dim); }
#settings-btn { font-size: 1.15rem; }

/* --- tabs --- */

.tabs {
  max-width: 720px;
  margin: 0 auto;
  padding: 0.6rem 0 0;
  display: flex;
  gap: 1.1rem;
  border-bottom: 1px solid var(--border);
}

.tab {
  appearance: none;
  background: none;
  border: none;
  padding: 0 0 0.5rem;
  margin-bottom: -1px;
  color: var(--text-dim);
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* --- debug bar --- */

.debug-bar {
  max-width: 720px;
  margin: 0 auto;
  padding-top: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.6rem;
  font-size: 0.68rem;
  color: var(--text-dim);
}
.debug-bar[hidden] { display: none; }

.debug-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.debug-input {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-dim);
  font-size: 0.68rem;
  font-family: inherit;
  padding: 0.15rem 0.35rem;
}

.ghost-btn {
  appearance: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.2rem 0.55rem;
  color: var(--text-dim);
  font-size: 0.72rem;
  font-family: inherit;
  cursor: pointer;
}
.ghost-btn:hover { color: var(--text); border-color: var(--text-dim); }

main {
  max-width: 720px;
  margin: 0 auto;
}

.tab-panel[hidden] { display: none; }

/* --- progress tab --- */

.progress-list {
  display: flex;
  flex-direction: column;
  max-width: 420px;
  margin: 0 auto;
  gap: 0.9rem;
  padding: 1rem 0 2rem;
}

.bar-row .bar-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.bar-label {
  font-size: 0.85rem;
  color: var(--text);
}

.bar-pct {
  font-size: 0.85rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.bar-track {
  position: relative;
  height: 10px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
}

.bar-fill {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
}

.bar-sub {
  margin-top: 0.35rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

/* --- current period (solo) tab --- */

.current-solo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 6rem);
  padding: 1rem 0 2rem;
}
.current-solo .bar-row { width: 100%; max-width: 420px; }
.current-solo .bar-label { font-size: 1.3rem; }
.current-solo .bar-pct { font-size: 1.3rem; }
.current-solo .bar-track { height: 22px; }
.current-solo .bar-sub { margin-top: 0.6rem; font-size: 1rem; }

/* --- grid (continuous + weekly) --- */

.grid {
  padding-top: 1rem;
}

.grid.mode-continuous {
  display: grid;
  grid-template-columns: repeat(var(--cols, auto-fill), var(--cell));
  justify-content: center;
  gap: 0;
}

.grid.mode-weekly {
  display: flex;
  flex-direction: column;
  gap: calc(var(--gap) * 3);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.grid.mode-weekly::-webkit-scrollbar { display: none; }

.week-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: calc(var(--gap) * 2);
}

.day-content {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: var(--gap);
  width: fit-content;
  padding-bottom: 3px;
}

.day-content.is-today-window {
  box-shadow: inset 0 -2px 0 var(--accent);
}

.no-school-slot {
  width: 100%;
  height: var(--cell);
  cursor: default;
  border: 1px solid transparent;
  border-radius: 3px;
}

.no-school-slot.is-active {
  border-color: var(--accent);
}

@media (max-width: 640px) {
  :root { --cell: 12px; --gap: 2px; }
}
@media (max-width: 420px) {
  :root { --cell: 9px; --gap: 2px; }
}

.period {
  position: relative;
  width: var(--cell);
  height: var(--cell);
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  overflow: hidden;
  flex: 0 0 auto;
  cursor: default;
}

.period.is-filtered {
  display: none;
}

.period-fill {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 0%;
  background: var(--done);
  z-index: 0;
}

.period.is-live {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(var(--accent-rgb), 0.25);
}
.period.is-live .period-fill { background: var(--accent); }

.period.is-today-upcoming {
  background: var(--today-upcoming);
}

.period .letter {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 600;
  color: transparent;
  transition: color 0.1s ease;
  pointer-events: none;
}

.period.is-group-hover {
  border-color: rgba(var(--accent-rgb), 0.35);
}
.period.is-group-hover .letter {
  color: var(--text-dim);
}

.period:hover {
  border-color: var(--accent);
}
.period:hover .letter {
  color: var(--accent);
}

.semester-divider {
  grid-column: 1 / -1;
  height: 0;
  border-top: 1px solid var(--border);
  margin: 1.4rem 0;
}

.grid.mode-weekly .semester-divider {
  margin: 0.3rem 0 0.7rem;
}

/* --- hover info panel --- */

.info-panel {
  position: fixed;
  z-index: 50;
  pointer-events: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  font-size: 0.72rem;
  line-height: 1.55;
  color: var(--text-dim);
  min-width: 220px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}
.info-panel[hidden] { display: none; }

.info-date {
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.info-period {
  color: var(--text);
  margin-bottom: 0.4rem;
}
.info-period .info-cycle {
  color: var(--text-dim);
  font-weight: 400;
}

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 1.2rem;
}
.info-row + .info-row { margin-top: 0.1rem; }
.info-row span:last-child {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* --- settings / help overlay --- */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--overlay-bg);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 4rem 1rem;
  overflow-y: auto;
}
.overlay[hidden] { display: none; }

.panel {
  width: 100%;
  max-width: 340px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem 1.2rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}
.panel[hidden] { display: none; }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.9rem;
}

.panel-section {
  margin-top: 1.1rem;
}
.panel-section:first-of-type { margin-top: 0; }

.panel-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.panel-label label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  color: var(--text-dim);
}
.panel-label input[type="checkbox"] { accent-color: var(--accent); }

.theme-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.7rem;
}

.mode-btn {
  appearance: none;
  flex: 1;
  background: var(--track);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem 0;
  color: var(--text-dim);
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
}
.mode-btn.active {
  color: var(--text);
  border-color: var(--accent);
}

.accent-row {
  display: flex;
  gap: 0.55rem;
}

.accent-dot {
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
}
.accent-dot.active {
  border-color: var(--text);
}

.letter-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.letter-chip {
  appearance: none;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--track);
  color: var(--text-dim);
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
}
.letter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.help-body {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-dim);
}
.help-body p { margin: 0 0 0.8rem; }
.help-body p:last-child { margin-bottom: 0; }
.help-body strong { color: var(--text); }
.help-body code {
  background: var(--track);
  border-radius: 3px;
  padding: 0.05rem 0.3rem;
  font-size: 0.75rem;
  color: var(--text);
}