*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --work-bg: #dcfce7;
  --work-text: #15803d;
  --work-solid: #16a34a;
  --today-color: #f97316;
  --weekend-text: #94a3b8;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 6px 16px rgba(0,0,0,0.05);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f0f9ff;
  color: #0f172a;
  min-height: 100vh;
}

/* ── Header: compact horizontal bar ── */
header {
  background: linear-gradient(135deg, #1e40af 0%, #0ea5e9 100%);
  color: white;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-shrink: 0;
}

.hero {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.hero h1 {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  line-height: 1;
}

.hero .subtitle {
  font-size: 0.7rem;
  opacity: 0.6;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* ── Legend ── */
.legend {
  display: flex;
  gap: 1rem;
  font-size: 0.75rem;
  opacity: 0.88;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  display: inline-block;
  flex-shrink: 0;
}

.legend-dot.work  { background: #4ade80; }
.legend-dot.today { background: transparent; border: 2px solid var(--today-color); }
.legend-dot.off   { background: rgba(255,255,255,0.2); border: 1px solid rgba(255,255,255,0.35); }

/* ── Stats ── */
.stats {
  display: flex;
  gap: 1.5rem;
}

.stat-item { text-align: center; }

.stat-value {
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1;
}

.stat-label {
  font-size: 0.58rem;
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 0.15rem;
}

/* ── Calendar grid ── */
main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.75rem 1rem 0.75rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

/* ── Month card ── */
.month-card {
  background: white;
  border-radius: 12px;
  padding: 0.7rem 0.8rem 0.6rem;
  box-shadow: var(--card-shadow);
}

.month-card.current-month {
  outline: 2px solid #0ea5e9;
}

.month-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.45rem;
}

.month-name {
  font-size: 0.88rem;
  font-weight: 800;
  color: #0f172a;
}

.month-badge {
  font-size: 0.64rem;
  font-weight: 700;
  color: var(--work-text);
  background: var(--work-bg);
  padding: 1px 7px;
  border-radius: 99px;
}

/* ── Day grid ── */
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}

.day-label {
  text-align: center;
  font-size: 0.58rem;
  font-weight: 700;
  color: #94a3b8;
  padding-bottom: 4px;
  letter-spacing: 0.1px;
}

.day-label.wknd { color: #cbd5e1; }

.day-cell {
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 500;
  border-radius: 5px;
}

.day-cell.empty   { background: transparent; }
.day-cell.wknd    { color: var(--weekend-text); }

.day-cell.work {
  background: var(--work-bg);
  color: var(--work-text);
  font-weight: 700;
}

.day-cell.today {
  box-shadow: 0 0 0 2px var(--today-color);
  color: var(--today-color);
  font-weight: 700;
}

.day-cell.work.today {
  background: var(--work-solid);
  color: white;
  box-shadow: 0 0 0 2px var(--today-color), 0 0 0 4px rgba(249,115,22,0.15);
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 0.5rem;
  color: #94a3b8;
  font-size: 0.72rem;
}

/* ── Responsive: collapse to 2 cols on narrow screens ── */
@media (max-width: 860px) {
  main { grid-template-columns: repeat(2, 1fr); }
  header { height: auto; padding: 0.75rem 1.25rem; flex-wrap: wrap; }
  .header-right { flex-wrap: wrap; gap: 0.75rem; }
}

@media (max-width: 540px) {
  main { grid-template-columns: 1fr; }
}