/* ─── Theme tokens ─────────────────────────────────────────── */

:root {
  /* Light mode (default) */
  --bg: #ffffff;
  --text: #111111;
  --text-muted: #666666;
  --border: #e5e5e5;
  --accent: #047857;
  --button-bg: #f5f5f5;
  --button-hover: #e5e5e5;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --text: #f5f5f5;
  --text-muted: #999999;
  --border: #222222;
  --accent: #34d399;
  --button-bg: #1a1a1a;
  --button-hover: #2a2a2a;
}

/* System preference applies only when user hasn't manually overridden */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0a0a0a;
    --text: #f5f5f5;
    --text-muted: #999999;
    --border: #222222;
    --accent: #34d399;
    --button-bg: #1a1a1a;
    --button-hover: #2a2a2a;
  }
}

/* ─── Reset + base ─────────────────────────────────────────── */

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

html {
  /* System font stack — no Google Fonts, no third-party tracking */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  color-scheme: light dark;
}

body {
  background: var(--bg);
  color: var(--text);
  max-width: 44rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  min-height: 100vh;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ─── Header ────────────────────────────────────────────────── */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

#theme-toggle {
  background: var(--button-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.125rem;
  transition: background-color 0.15s ease;
}

#theme-toggle:hover {
  background: var(--button-hover);
}

#theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ─── Current conditions ───────────────────────────────────── */

#current {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

#current .location {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

#current .update-location {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent);
  font-size: 0.8125rem;
  font-family: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

#current .update-location:hover {
  text-decoration: none;
}

#current .update-location:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

#current .temp {
  font-size: 3.5rem;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

#current .condition {
  font-size: 1rem;
  color: var(--text-muted);
}

#current .loading {
  font-size: 1rem;
  color: var(--text-muted);
  padding: 1rem 0;
}

/* ─── Forecast ─────────────────────────────────────────────── */

#forecast h2 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

#forecast-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

#forecast-list > li {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
}

#forecast-list details > summary {
  display: grid;
  grid-template-columns: minmax(6rem, auto) 1fr auto auto;
  gap: 1rem;
  align-items: center;
  padding: 0.75rem 1rem;
  cursor: pointer;
  list-style: none;
}

/* Hide default disclosure marker across browsers */
#forecast-list details > summary::-webkit-details-marker {
  display: none;
}

#forecast-list details > summary::after {
  content: '›';
  font-size: 1.25rem;
  color: var(--text-muted);
  line-height: 1;
  transition: transform 0.15s ease;
}

#forecast-list details[open] > summary::after {
  transform: rotate(90deg);
}

#forecast-list details > summary:hover {
  background: var(--button-bg);
}

#forecast-list .day {
  font-weight: 500;
}

#forecast-list .condition {
  color: var(--text-muted);
  font-size: 0.9375rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.icon {
  width: 1.125em;
  height: 1.125em;
  flex-shrink: 0;
  color: var(--accent);
}

#current .condition {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

#current .icon {
  width: 1.25em;
  height: 1.25em;
}

#forecast-list .temp {
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

#forecast-list .hourly {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--border);
}

#forecast-list .hourly > li {
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

#forecast-list .hourly > li:nth-child(even) {
  background: var(--button-bg);
}

#forecast-list .hourly .hour {
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

#forecast-list .hourly-empty {
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-style: italic;
}

/* ─── Status (offline indicator, etc) ──────────────────────── */

#status {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
}

/* ─── Footer ───────────────────────────────────────────────── */

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-align: center;
}

footer p {
  margin-bottom: 0.25rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}