:root {
  --bg: #f8fafc;
  --panel-bg: #ffffff;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-tint: rgba(37, 99, 235, 0.08);
  --overdue: #dc2626;
  --overdue-tint: rgba(220, 38, 38, 0.08);
  --chip-bg: #eef2f7;
  --chip-active-bg: #1e293b;
  --chip-active-text: #ffffff;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 1px rgba(15, 23, 42, 0.04);
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --panel-bg: #161f32;
    --card-bg: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #2f3c53;
    --accent: #60a5fa;
    --accent-tint: rgba(96, 165, 250, 0.14);
    --overdue: #f87171;
    --overdue-tint: rgba(248, 113, 113, 0.14);
    --chip-bg: #1e293b;
    --chip-active-bg: #f1f5f9;
    --chip-active-text: #0f172a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px rgba(0, 0, 0, 0.25);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 2.5rem) 2.5rem;
}

/* ---------- Header ---------- */

.app-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding: 1.5rem 0 1rem;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 20;
}

.app-header h1 {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  margin: 0;
  letter-spacing: -0.01em;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.demo-badge {
  background: var(--accent-tint);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.last-synced.sync-error {
  color: var(--overdue);
  font-weight: 600;
}

/* ---------- Toolbar (tabs + filters) ---------- */

.toolbar {
  position: sticky;
  top: 3.5rem;
  z-index: 19;
  background: var(--bg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.week-tabs {
  display: inline-flex;
  background: var(--chip-bg);
  padding: 0.25rem;
  border-radius: 999px;
  gap: 0.25rem;
}

.week-tab {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
}

.week-tab.active {
  background: var(--panel-bg);
  color: var(--text);
  box-shadow: var(--shadow);
}

.filters {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-chips {
  display: inline-flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.chip {
  border: 1px solid var(--border);
  background: var(--chip-bg);
  color: var(--text);
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
}

.chip.active {
  background: var(--chip-active-bg);
  color: var(--chip-active-text);
  border-color: transparent;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.toggle input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}

/* ---------- Weeks / day grid ---------- */

.weeks {
  min-height: 40vh;
}

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

.day-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.85rem;
  align-items: start;
}

.day-column {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  min-height: 10rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.day-column.is-today {
  border-color: var(--accent);
  background: var(--accent-tint);
}

.day-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.day-header .weekday {
  font-weight: 700;
  font-size: 0.95rem;
}

.day-header .date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.day-column.is-today .weekday::after {
  content: "Today";
  margin-left: 0.5rem;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--accent);
  background: var(--panel-bg);
  border-radius: 999px;
  padding: 0.12rem 0.5rem;
  vertical-align: middle;
}

.day-events {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.day-empty {
  color: var(--text-muted);
  font-size: 0.85rem;
  opacity: 0.6;
  padding: 0.25rem 0;
}

/* ---------- Event cards ---------- */

.event-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--lane-color, var(--border));
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
  box-shadow: var(--shadow);
}

.event-card.overdue {
  border-color: var(--overdue);
  background: var(--overdue-tint);
}

.event-kid {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--lane-color, var(--text-muted));
  margin-bottom: 0.15rem;
}

.event-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
}

.event-meta {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.event-meta .badge {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: 0.68rem;
  padding: 0.08rem 0.45rem;
  border-radius: 999px;
  background: var(--chip-bg);
}

.event-meta .badge.type-test {
  color: var(--accent);
}

.event-meta .countdown {
  font-weight: 600;
}

.event-card.overdue .countdown,
.event-card.overdue .event-meta {
  color: var(--overdue);
}

/* ---------- Weekend list ---------- */

.weekend-panel {
  margin-top: 1.25rem;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.weekend-panel h3 {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.weekend-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.weekend-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.4rem 0.55rem;
  border-left: 4px solid var(--lane-color, var(--border));
  border-radius: 8px;
  background: var(--card-bg);
}

.weekend-item.overdue {
  border-color: var(--overdue);
  background: var(--overdue-tint);
}

.weekend-date {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 6rem;
}

.weekend-title {
  font-size: 0.92rem;
  font-weight: 600;
}

.weekend-empty {
  color: var(--text-muted);
  font-size: 0.88rem;
  opacity: 0.7;
}

/* ---------- Empty state ---------- */

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 1rem;
  font-size: 1rem;
}

.loading {
  color: var(--text-muted);
  padding: 2rem 0;
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .day-grid {
    grid-template-columns: 1fr;
  }
}