:root {
	--bg-color: #f5f5f7;
	--card-bg: #ffffff;
	--text-main: #1d1d1f;
	--text-sec: #86868b;
	--text-light: #a1a1a6;
	--accent: #0066cc;
	--border: #d2d2d7;
	--radius: 12px;
	--mono-font: "JetBrains Mono", "SF Mono", "Menlo", "Monaco", "Consolas", monospace;
	--condensed-font: "Bahnschrift", -apple-system, BlinkMacSystemFont, sans-serif-condensed, "HarmonyOS Sans Condensed", "Roboto Condensed", "Ubuntu Sans Condensed", "Ubuntu Condensed", "Inconsolata", "Ubuntu Mono", sans-serif;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg-color: #000000;
		--card-bg: #1c1c1e;
		--text-main: #f5f5f7;
		--text-sec: #a1a1a6;
		--text-light: #6e6e73;
		--accent: #007aff;
		--border: #38383a;
	}
}

* {
	box-sizing: border-box;
	-webkit-tap-highlight-color: transparent;
}

body {
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	background-color: var(--bg-color);
	color: var(--text-main);
	margin: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	padding: 0 20px;
	min-height: 100vh;
}

.container {
	width: 100%;
	max-width: 360px;
	margin-top: 24px;
	margin-bottom: 24px;
}

header,
footer {
	position: absolute;
	left: 50%;
	transform: translateX(-50%);
	width: calc(100% - 40px);
	max-width: 360px;
	display: flex;
	flex-direction: row-reverse;
	justify-content: space-between;
	align-items: center;
	z-index: 10;
}

@media screen and (max-height: 879px) {
	footer {
		display: none;
	}
}

@media screen and (min-height: 880px) {
	footer {
		display: flex;
	}
}

header {
	top: 24px;
}

footer {
	bottom: 24px;
}

h1 {
	font-size: 1.5rem;
	margin: 0;
	font-weight: 600;
	margin-bottom: 24px;
	display: flex;
	justify-content: center;
	align-items: center;
}

h1 img {
	height: 1em;
	vertical-align: -0.12em;
	margin-right: 0.2em;
}

h1 object {
	height: 1.5em;
	width: 1.5em;
}

.source-link {
	color: var(--text-light);
	text-decoration: none;
	font-size: 0.85rem;
}

.card {
	background: var(--card-bg);
	border-radius: var(--radius);
	padding: 24px;
	margin-bottom: 20px;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.input-group {
	display: flex;
	justify-content: space-between;
	align-items: baseline;
	margin-bottom: 16px;
}

label {
	font-size: 0.95rem;
	color: var(--text-main);
	padding-top: 8px;
}

.input-control {
	display: flex;
	flex-direction: column;
	align-items: flex-end;
}

.input-main {
	display: flex;
	align-items: center;
	gap: 8px;
}

.unit {
	font-size: 0.85rem;
	color: var(--text-sec);
	width: 2.5em;
}

input[type="number"] {
	width: 5.5em;
	padding: 8px 10px;
	border: 1px solid var(--border);
	border-radius: 8px;
	background: transparent;
	color: var(--text-main);
	font-size: 1.05rem;
	font-family: var(--mono-font);
	text-align: right;
	outline: none;
}

input:focus {
	border-color: var(--accent);
}

.cm-hint {
	font-size: 0.75rem;
	color: var(--text-light);
}

.checkbox-group {
	display: flex;
	flex-direction: row-reverse;
	align-items: baseline;
	gap: 8px;
	font-size: 0.9rem;
	margin-top: 10px;
	color: var(--text-sec);
}

#result {
	text-align: center;
	padding: 10px 0;
}

#ppi {
	font-size: 2.4rem;
	font-weight: 700;
	color: var(--accent);
	margin: 0;
	font-family: var(--mono-font);
}

#tooLow {
	color: #ff3b30;
	font-size: 0.9rem;
	margin-top: 8px;
	line-height: 1.4;
}

.section-title {
	font-size: 0.9rem;
	font-weight: 600;
	margin: 24px 0 12px;
	color: var(--text-sec);
}

.table-wrapper {
	overflow-x: auto;
	margin: 16px -8px 0;
}

table {
	width: 100%;
	min-width: 300px;
	border-collapse: collapse;
	font-size: 0.85rem;
	text-align: center;
}

th {
	color: var(--text-sec);
	font-weight: normal;
	padding: 8px;
}

td {
	padding: 12px 8px;
	border-top: 1px solid var(--border);
	font-family: var(--condensed-font);
	font-stretch: condensed;
}

#officeScale {
	margin-top: 24px;
	font-size: 0.85rem;
	border-top: 1px dashed var(--border);
	padding-top: 20px;
}

#officeScale img {
	width: 100%;
	border-radius: 6px;
	margin-bottom: 12px;
	filter: grayscale(1) opacity(0.8);
}

@media (prefers-color-scheme: dark) {
	#officeScale img {
		filter: invert(1) opacity(0.6);
	}
}

.hidden {
	display: none !important;
}