:root {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: rgba(22, 27, 34, 0.94);
  --panel-border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --cell-size: 14px;
  --gap: 5px;
  --level-0: #161b22;
  --level-1: #0e4429;
  --level-2: #006d32;
  --level-3: #26a641;
  --level-4: #39d353;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4efe6;
  --panel: rgba(251, 248, 242, 0.96);
  --panel-border: #d8cec0;
  --text: #2f2a24;
  --muted: #6b6257;
  --accent: #7c5cff;
  --shadow: 0 20px 50px rgba(90, 74, 52, 0.10);
  --level-0: #e6dfd4;
  --level-1: #bdd9b6;
  --level-2: #8bc98d;
  --level-3: #55ab67;
  --level-4: #2f7d46;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, color-mix(in srgb, var(--accent) 10%, var(--bg)) 0%, var(--bg) 48%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background 180ms ease, color 180ms ease;
}

body::selection {
  background: rgba(88, 166, 255, 0.35);
}

.page {
  width: min(1100px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 72px 0 56px;
}

.hero {
  margin-bottom: 32px;
}

.hero-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, background 180ms ease, color 180ms ease, box-shadow 120ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--panel-border));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
  outline: none;
}

.theme-icon {
  position: absolute;
  font-size: 1.1rem;
  line-height: 1;
  transition: opacity 140ms ease, transform 140ms ease;
}

.theme-icon-sun {
  opacity: 0;
  transform: scale(0.7) rotate(-20deg);
}

.theme-icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

:root[data-theme="light"] .theme-icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

:root[data-theme="light"] .theme-icon-moon {
  opacity: 0;
  transform: scale(0.7) rotate(20deg);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 700;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.intro {
  margin-top: 16px;
  max-width: 650px;
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--muted);
}

.panel {
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  overflow-x: auto;
  transition: background 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.panel + .panel {
  margin-top: 28px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.panel-header h2 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.chart-change {
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.chart-change[data-direction="down"] {
  color: #f85149;
  background: color-mix(in srgb, #f85149 12%, transparent);
}

.value-chart-shell {
  position: relative;
}

.value-chart {
  display: block;
  width: 100%;
  height: 280px;
  overflow: visible;
}

.chart-gridline {
  stroke: color-mix(in srgb, var(--muted) 35%, transparent);
  stroke-width: 1;
}

.chart-area {
  fill: url(#value-area-gradient);
}

.chart-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-point {
  fill: var(--panel);
  stroke: var(--accent);
  stroke-width: 2;
  cursor: pointer;
  transition: transform 120ms ease, fill 120ms ease;
}

.chart-point:hover,
.chart-point:focus-visible {
  fill: var(--accent);
  outline: none;
}

.value-chart-axis {
  display: grid;
  gap: 6px;
  margin-top: 2px;
  font-size: 0.72rem;
  color: var(--muted);
}

.chart-tooltip {
  position: absolute;
  left: 0;
  top: 0;
  transform: translate(-50%, calc(-100% - 12px));
  padding: 8px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 0.82rem;
  pointer-events: none;
  white-space: nowrap;
  z-index: 2;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.muted,
.status,
.legend-label,
.weekday-column,
.month-row {
  color: var(--muted);
}

.legend {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 0.85rem;
}

.legend-swatch,
.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.heatmap-shell {
  min-width: fit-content;
}

.month-row {
  display: grid;
  grid-template-columns: 32px repeat(17, var(--cell-size));
  gap: var(--gap);
  align-items: end;
  margin-bottom: 10px;
  padding-left: 0;
  font-size: 0.75rem;
}

.month-label:first-child {
  grid-column: 2;
}

.heatmap-body {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.weekday-column {
  width: 32px;
  display: grid;
  grid-template-rows: repeat(7, var(--cell-size));
  gap: var(--gap);
  font-size: 0.75rem;
  padding-top: 1px;
}

.weekday-column span:nth-child(1) {
  grid-row: 2;
}

.weekday-column span:nth-child(2) {
  grid-row: 4;
}

.weekday-column span:nth-child(3) {
  grid-row: 6;
}

.heatmap-grid {
  display: grid;
  grid-template-rows: repeat(7, var(--cell-size));
  grid-auto-flow: column;
  gap: var(--gap);
}

.cell {
  appearance: none;
  padding: 0;
  background: var(--level-0);
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.cell:hover,
.cell:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(230, 237, 243, 0.4);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.18);
  outline: none;
}

.level-0 {
  background: var(--level-0);
}

.level-1 {
  background: var(--level-1);
}

.level-2 {
  background: var(--level-2);
}

.level-3 {
  background: var(--level-3);
}

.level-4 {
  background: var(--level-4);
}

.status {
  margin-top: 18px;
  font-size: 0.95rem;
  min-height: 1.4em;
}

@media (max-width: 720px) {
  .page {
    width: min(100vw - 20px, 1100px);
    padding-top: 40px;
    padding-bottom: 28px;
  }

  .panel {
    padding: 18px;
    border-radius: 18px;
  }

  .hero-topbar {
    align-items: flex-start;
  }

  .panel-header {
    flex-direction: column;
    margin-bottom: 18px;
  }

  .chart-change {
    align-self: flex-start;
  }

  .value-chart {
    height: 220px;
  }

  .value-chart-axis {
    grid-template-columns: repeat(30, minmax(0, 1fr));
    gap: 4px;
    font-size: 0.68rem;
  }

  .legend {
    justify-content: flex-start;
  }
}