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

[hidden] {
  display: none !important;
}

:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #2b2f36;
  --muted: #9aa0a6;
  --line: #e3e5e8;
  --sun: #f97316;
  --sun-soft: #fb923c;
  --arc-muted: #94a3b8;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card: #1d2025;
    --ink: #e9eaec;
    --muted: #7d828a;
    --line: #2c3036;
    --sun: #fb923c;
    --sun-soft: #fdba74;
    --arc-muted: #5b6472;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  }
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.card {
  background: var(--card);
  width: 100%;
  max-width: 640px;
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 1.75rem 1.75rem 2rem;
}

.card-head h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.subtitle {
  font-size: 0.85rem;
  color: var(--muted);
  min-height: 1.2em;
}

/* ---- arc ---- */
.arc-wrap {
  margin: 0.25rem 0 0.5rem;
}

#sky {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

#horizon {
  stroke: var(--line);
  stroke-width: 2;
}

.uv-area {
  opacity: 0.28;
}

.arc {
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 2 9;
}

.arc-full {
  stroke: var(--arc-muted);
}

.arc-done {
  stroke: var(--sun);
}

.endpoint {
  fill: var(--sun);
}

.time-label {
  fill: var(--sun);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.sun .sun-core {
  fill: none;
  stroke: var(--sun);
  stroke-width: 2.5;
}

.sun .sun-rays line {
  stroke: var(--sun);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.sun.below {
  opacity: 0.45;
}

/* ---- stats ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 0.5rem 0.75rem;
  padding: 0.75rem 0;
  margin-top: 0.25rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.stat-val {
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* ---- controls ---- */
.controls {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.control-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.control-row + .control-row {
  margin-top: 0.6rem;
}

label {
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 2.5rem;
}

input[type="date"],
input[type="number"] {
  font: inherit;
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.4rem 0.55rem;
}

input[type="number"] {
  width: 7rem;
}

input[type="range"] {
  flex: 1;
  min-width: 8rem;
  accent-color: var(--sun);
}

.time-out {
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  min-width: 3.2rem;
  text-align: right;
  color: var(--ink);
}

button.ghost {
  font: inherit;
  font-size: 0.82rem;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

button.ghost:hover {
  border-color: var(--sun);
  color: var(--sun);
}

.control-loc summary {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  list-style: none;
}

.control-loc summary::-webkit-details-marker {
  display: none;
}

.summary-label {
  color: var(--muted);
}

.summary-label::after {
  content: " ▾";
}

.loc-summary {
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.control-loc[open] > summary {
  margin-bottom: 0.6rem;
}

.geo-msg {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.5rem;
}

/* On very narrow screens, let the card fill the viewport edge to edge. */
@media (max-width: 380px) {
  body {
    padding: 0;
  }

  .card {
    min-height: 100vh;
    border-radius: 0;
    box-shadow: none;
  }
}