:root {
	color-scheme: light dark;
	--font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	--bg: #eaf4f6;
	--bg-gradient: linear-gradient(180deg, #d5ebf0 0%, #eaf4f6 28rem);
	--surface: #ffffff;
	--surface-alt: #f2f8f9;
	--text: #0f2f36;
	--muted: #46646a;
	--border: #c4dadd;
	--accent: #0b6674;
	--accent-contrast: #ffffff;
	--focus: #0a58ca;
	--shadow: 0 0.5rem 1.5rem #0f2f3614;
	--hero-bg: linear-gradient(145deg, #0b6674 0%, #0e8a9b 55%, #3bb3c3 100%);
	--hero-text: #ffffff;
	--warn-bg: #fff3cd;
	--warn-text: #5c3d00;
	--radius: 1.25rem;
}

@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--bg: #0b1d26;
		--bg-gradient: linear-gradient(180deg, #0f2d3a 0%, #0b1d26 28rem);
		--surface: #12303c;
		--surface-alt: #173a48;
		--text: #e6f3f6;
		--muted: #9fbcc3;
		--border: #2a4e5c;
		--accent: #5cc8d7;
		--accent-contrast: #062b33;
		--focus: #8ab4ff;
		--shadow: 0 0.5rem 1.5rem #00000066;
		--hero-bg: linear-gradient(145deg, #0d4a57 0%, #0f6b7a 60%, #1c8c9c 100%);
		--warn-bg: #4a3a0a;
		--warn-text: #ffe8a3;
	}
}

:root[data-theme="dark"] {
	--bg: #0b1d26;
	--bg-gradient: linear-gradient(180deg, #0f2d3a 0%, #0b1d26 28rem);
	--surface: #12303c;
	--surface-alt: #173a48;
	--text: #e6f3f6;
	--muted: #9fbcc3;
	--border: #2a4e5c;
	--accent: #5cc8d7;
	--accent-contrast: #062b33;
	--focus: #8ab4ff;
	--shadow: 0 0.5rem 1.5rem #00000066;
	--hero-bg: linear-gradient(145deg, #0d4a57 0%, #0f6b7a 60%, #1c8c9c 100%);
	--warn-bg: #4a3a0a;
	--warn-text: #ffe8a3;
}

* {
	box-sizing: border-box;
}

[hidden] {
	display: none !important;
}

body {
	min-height: 100vh;
	margin: 0;
	padding: 1rem 0 2rem;
	font-family: var(--font);
	line-height: 1.5;
	color: var(--text);
	background: var(--bg) var(--bg-gradient) no-repeat;
	transition: background-color 0.3s, color 0.3s;
}

main {
	display: grid;
	gap: 1rem;
	width: min(56rem, calc(100% - 2rem));
	margin: 0 auto;
}

:focus-visible {
	outline: 3px solid var(--focus);
	outline-offset: 2px;
}

.skip-link {
	position: absolute;
	left: 1rem;
	top: -4rem;
	padding: 0.5rem 1rem;
	border-radius: 0.5rem;
	color: var(--accent-contrast);
	background: var(--accent);
}

.skip-link:focus {
	top: 0.5rem;
	z-index: 10;
}

h1, h2, h3, p {
	margin: 0;
}

.page-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	flex-wrap: wrap;
}

h1 {
	font-size: 1.25rem;
	font-weight: 700;
}

.toolbar {
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.card {
	padding: 1.25rem;
	border: 1px solid var(--border);
	border-radius: var(--radius);
	background: var(--surface);
	box-shadow: var(--shadow);
	transition: background-color 0.3s, border-color 0.3s;
}

/* Hero */
.hero {
	display: grid;
	justify-items: center;
	gap: 0.75rem;
	padding: 2rem 1rem;
	border: 0;
	color: var(--hero-text);
	background: var(--hero-bg);
	text-align: center;
}

.eyebrow {
	font-size: 0.9rem;
	font-weight: 600;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	opacity: 0.95;
}

.hero-temperature {
	font-size: clamp(4rem, 22vw, 8rem);
	font-weight: 800;
	letter-spacing: -0.04em;
	line-height: 1;
	font-variant-numeric: tabular-nums;
}

.hero-temperature .unit {
	margin-left: 0.1em;
	font-size: 0.4em;
	font-weight: 600;
	letter-spacing: 0;
	vertical-align: 0.9em;
}

.hero-temperature .loading-text,
.hero-temperature.message {
	font-size: 1.75rem;
	font-weight: 600;
	letter-spacing: 0;
}

.badge {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.35rem 1rem;
	border: 2px solid currentColor;
	border-radius: 999px;
	font-size: 1.125rem;
	font-weight: 700;
	color: #0f2f36;
	background: #ffffff;
}

.badge[data-condition="cold"] { color: #0a3f8c; border-style: double; border-width: 4px; }
.badge[data-condition="cool"] { color: #0b5d6b; border-style: dashed; }
.badge[data-condition="comfortable"] { color: #12602f; border-style: solid; }
.badge[data-condition="warm"] { color: #8a3200; border-style: dotted; border-width: 3px; }

.hint {
	max-width: 30rem;
	opacity: 0.95;
}

.reading-time {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 1rem;
}

.reading-time time {
	text-decoration: underline dotted;
	text-underline-offset: 0.25em;
	cursor: help;
}

.status-dot {
	width: 0.65rem;
	height: 0.65rem;
	border-radius: 50%;
	background: #7dffb0;
	box-shadow: 0 0 0 0.2rem #7dffb040;
}

.hero[data-stale="true"] .status-dot {
	border-radius: 0;
	background: #ffd166;
	box-shadow: none;
	clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.stale-banner {
	padding: 0.5rem 1rem;
	border-radius: 0.75rem;
	color: var(--warn-text);
	background: var(--warn-bg);
	font-size: 0.95rem;
}

/* Stats */
.stats {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 1rem;
}

.stat {
	padding: 1rem;
}

.stat h3 {
	color: var(--muted);
	font-size: 0.85rem;
	font-weight: 600;
	letter-spacing: 0.05em;
	text-transform: uppercase;
}

.stat-value {
	margin-top: 0.25rem;
	font-size: 1.6rem;
	font-weight: 700;
	font-variant-numeric: tabular-nums;
}

.stat-detail {
	color: var(--muted);
	font-size: 0.85rem;
}

/* History */
.history-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 0.75rem;
}

#history h2 {
	font-size: 1.125rem;
}

#chart-container {
	position: relative;
	height: 16rem;
	margin-top: 1rem;
}

.chart-overlay {
	position: absolute;
	inset: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 0.75rem;
	padding: 1rem;
	border-radius: 0.75rem;
	color: var(--muted);
	background: var(--surface-alt);
	text-align: center;
}

.chart-overlay[data-state="loading"] p::before {
	content: "";
	display: block;
	width: 1.75rem;
	height: 1.75rem;
	margin: 0 auto 0.5rem;
	border: 3px solid var(--border);
	border-top-color: var(--accent);
	border-radius: 50%;
	animation: spin 0.9s linear infinite;
}

#history-status,
.note {
	margin-top: 0.5rem;
	color: var(--muted);
	font-size: 0.9rem;
}

#history-status {
	min-height: 1.5rem;
}

/* Controls */
.segmented {
	display: inline-flex;
	padding: 0.2rem;
	border: 1px solid var(--border);
	border-radius: 999px;
	background: var(--surface-alt);
}

.segmented button,
#retry-history {
	min-width: 2.75rem;
	min-height: 2.5rem;
	padding: 0.25rem 0.75rem;
	border: 0;
	border-radius: 999px;
	color: var(--text);
	background: transparent;
	font: inherit;
	font-weight: 600;
	cursor: pointer;
	transition: background-color 0.2s, color 0.2s;
}

.segmented button:hover {
	background: var(--border);
}

.segmented button[aria-pressed="true"] {
	color: var(--accent-contrast);
	background: var(--accent);
}

#retry-history {
	padding: 0.25rem 1.25rem;
	color: var(--accent-contrast);
	background: var(--accent);
}

.icon-button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 2.75rem;
	height: 2.75rem;
	border: 1px solid var(--border);
	border-radius: 50%;
	color: var(--text);
	background: var(--surface-alt);
	cursor: pointer;
	transition: background-color 0.2s;
}

.icon-button:hover {
	background: var(--border);
}

/* Footer */
#social-links {
	margin-top: 0.5rem;
	color: var(--muted);
}

#social-links p {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.75rem;
}

#social-links a {
	display: inline-flex;
	width: 2rem;
	height: 2rem;
}

#social-links svg {
	width: 100%;
	height: 100%;
}

@keyframes spin {
	to { transform: rotate(360deg); }
}

@media (min-width: 40rem) {
	body {
		padding-top: 2rem;
	}

	.stats {
		grid-template-columns: repeat(4, 1fr);
	}

	.hero {
		padding: 3rem 1rem;
	}

	#chart-container {
		height: 22rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
	}
}