/**
 * Science Converter - self-contained styling.
 *
 * Everything is scoped under .sc-app and every property the widget relies on
 * is set explicitly, so a theme cannot leak in and the widget cannot leak out.
 * Follows the visitor's light/dark preference.
 */

.sc-app {
	--sc-ground: #f5f7f9;
	--sc-surface: #ffffff;
	--sc-surface-2: #eef1f5;
	--sc-ink: #14191f;
	--sc-ink-2: #414b57;
	--sc-muted: #6a7482;
	--sc-rule: #d9dfe6;
	--sc-rule-soft: #e8ecf1;
	--sc-accent: #1f5f8b;
	--sc-accent-ink: #ffffff;
	--sc-accent-wash: #e5eef5;
	--sc-error: #a52d24;
	--sc-good: #2c6640;

	--sc-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	--sc-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

	box-sizing: border-box;
	display: block;
	max-width: 100%;
	margin: 1.6rem 0;
	padding: 0;
	background: var(--sc-ground);
	color: var(--sc-ink);
	font-family: var(--sc-sans);
	font-size: 15px;
	line-height: 1.55;
	border: 1px solid var(--sc-rule);
	border-radius: 6px;
	overflow: hidden;
	text-align: left;
}

@media (prefers-color-scheme: dark) {
	.sc-app {
		--sc-ground: #12161b;
		--sc-surface: #191f26;
		--sc-surface-2: #212832;
		--sc-ink: #e7ecf2;
		--sc-ink-2: #c0c9d4;
		--sc-muted: #8e99a6;
		--sc-rule: #2c343d;
		--sc-rule-soft: #232a33;
		--sc-accent: #7bb0d4;
		--sc-accent-ink: #0d1116;
		--sc-accent-wash: #1b2833;
		--sc-error: #e59b93;
		--sc-good: #86c39c;
	}
}

.sc-app *,
.sc-app *::before,
.sc-app *::after { box-sizing: border-box; }

.sc-app button,
.sc-app input,
.sc-app select {
	font-family: inherit;
	font-size: inherit;
	color: inherit;
	margin: 0;
}

/* ------------------------------------------------------------------- tabs */

.sc-app .sc-tabs {
	display: flex;
	flex-wrap: wrap;
	gap: 0;
	background: var(--sc-surface-2);
	border-bottom: 1px solid var(--sc-rule);
	padding: 0;
	margin: 0;
	list-style: none;
}

.sc-app .sc-tab {
	appearance: none;
	border: 0;
	border-bottom: 2px solid transparent;
	background: transparent;
	padding: .72rem 1.05rem;
	font-size: .86rem;
	font-weight: 600;
	color: var(--sc-muted);
	cursor: pointer;
	line-height: 1.3;
	text-transform: none;
	letter-spacing: 0;
	border-radius: 0;
	box-shadow: none;
}

.sc-app .sc-tab:hover { color: var(--sc-ink); }

.sc-app .sc-tab.is-active {
	color: var(--sc-accent);
	border-bottom-color: var(--sc-accent);
	background: var(--sc-surface);
}

.sc-app .sc-tab:focus-visible { outline: 2px solid var(--sc-accent); outline-offset: -2px; }

/* ------------------------------------------------------------------- body */

.sc-app .sc-body { background: var(--sc-surface); }

.sc-app .sc-panel {
	padding: 1.25rem 1.25rem 1.5rem;
	display: block;
}

.sc-app .sc-panel[hidden] { display: none; }

.sc-app .sc-lede {
	margin: 0 0 1rem;
	color: var(--sc-ink-2);
	font-size: .875rem;
	max-width: 70ch;
	line-height: 1.55;
}

.sc-app .sc-h3 {
	font-size: .82rem;
	font-weight: 600;
	letter-spacing: .07em;
	text-transform: uppercase;
	color: var(--sc-muted);
	margin: 1.8rem 0 .7rem;
	padding: 0;
	border: 0;
}

/* ----------------------------------------------------------------- fields */

.sc-app .sc-input,
.sc-app .sc-select {
	appearance: none;
	-webkit-appearance: none;
	width: 100%;
	padding: .58rem .7rem;
	background: var(--sc-surface);
	border: 1px solid var(--sc-rule);
	border-radius: 4px;
	color: var(--sc-ink);
	line-height: 1.4;
	min-height: 2.5rem;
	box-shadow: none;
}

.sc-app .sc-select {
	background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
	background-position: calc(100% - 15px) calc(50% + 1px), calc(100% - 10px) calc(50% + 1px);
	background-size: 5px 5px, 5px 5px;
	background-repeat: no-repeat;
	padding-right: 1.9rem;
	cursor: pointer;
}

.sc-app .sc-input:focus,
.sc-app .sc-select:focus {
	outline: 2px solid var(--sc-accent);
	outline-offset: -1px;
	border-color: var(--sc-accent);
}

.sc-app .sc-select-sm { width: auto; min-height: 2.1rem; padding: .28rem 1.6rem .28rem .5rem; font-size: .82rem; }

.sc-app .sc-label {
	display: block;
	font-size: .74rem;
	font-weight: 600;
	letter-spacing: .07em;
	text-transform: uppercase;
	color: var(--sc-muted);
	margin-bottom: .3rem;
}

.sc-app .sc-row { margin-bottom: 1rem; }

.sc-app .sc-row-spec {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
	gap: .6rem;
}

/* ----------------------------------------------------------------- search */

.sc-app .sc-search { position: relative; margin-bottom: 1rem; }

.sc-app .sc-results {
	position: absolute;
	z-index: 20;
	left: 0;
	right: 0;
	top: calc(100% + 3px);
	max-height: 340px;
	overflow-y: auto;
	background: var(--sc-surface);
	border: 1px solid var(--sc-rule);
	border-radius: 5px;
	box-shadow: 0 12px 32px rgba(10, 15, 22, .18);
}

.sc-app .sc-result {
	display: grid;
	grid-template-columns: 5.5rem minmax(0, 1fr) auto;
	gap: .6rem;
	align-items: baseline;
	width: 100%;
	text-align: left;
	padding: .5rem .75rem;
	background: transparent;
	border: 0;
	border-bottom: 1px solid var(--sc-rule-soft);
	cursor: pointer;
	font-size: .85rem;
}

.sc-app .sc-result:hover { background: var(--sc-accent-wash); }
.sc-app .sc-result:last-child { border-bottom: 0; }
.sc-app .sc-result-empty { display: block; color: var(--sc-muted); cursor: default; }
.sc-app .sc-result-sym { font-family: var(--sc-mono); font-weight: 500; color: var(--sc-accent); }
.sc-app .sc-result-name { color: var(--sc-ink); }
.sc-app .sc-result-cat { color: var(--sc-muted); font-size: .76rem; white-space: nowrap; }

/* -------------------------------------------------------------- converter */

.sc-app .sc-convert {
	display: grid;
	grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
	gap: .7rem;
	align-items: end;
	margin-bottom: .85rem;
}

.sc-app .sc-box {
	display: flex;
	flex-direction: column;
	gap: .35rem;
	min-width: 0;
}

.sc-app .sc-box-label {
	font-size: .72rem;
	font-weight: 600;
	letter-spacing: .08em;
	text-transform: uppercase;
	color: var(--sc-muted);
}

.sc-app .sc-value {
	font-family: var(--sc-mono);
	font-size: 1.15rem;
	padding: .55rem .7rem;
}

.sc-app .sc-output {
	display: block;
	font-family: var(--sc-mono);
	font-size: 1.15rem;
	padding: .55rem .7rem;
	min-height: 2.5rem;
	background: var(--sc-accent-wash);
	border: 1px solid var(--sc-accent);
	border-radius: 4px;
	color: var(--sc-ink);
	overflow-x: auto;
	white-space: nowrap;
	font-variant-numeric: tabular-nums;
}

.sc-app .sc-swap {
	appearance: none;
	border: 1px solid var(--sc-rule);
	background: var(--sc-surface-2);
	color: var(--sc-ink-2);
	width: 2.5rem;
	height: 2.5rem;
	border-radius: 4px;
	font-size: 1.1rem;
	cursor: pointer;
	line-height: 1;
	flex: 0 0 auto;
}

.sc-app .sc-swap:hover { background: var(--sc-accent); color: var(--sc-accent-ink); border-color: var(--sc-accent); }

/* -------------------------------------------------------- meta + controls */

.sc-app .sc-meta {
	display: flex;
	flex-wrap: wrap;
	gap: .7rem 1rem;
	align-items: center;
	justify-content: space-between;
	padding: .6rem .75rem;
	background: var(--sc-surface-2);
	border-radius: 4px;
}

.sc-app .sc-relation {
	font-family: var(--sc-mono);
	font-size: .8rem;
	color: var(--sc-ink-2);
	background: transparent;
	padding: 0;
	overflow-x: auto;
	white-space: nowrap;
	max-width: 100%;
}

.sc-app .sc-controls { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; }

.sc-app .sc-sig {
	display: inline-flex;
	align-items: center;
	gap: .4rem;
	font-size: .78rem;
	color: var(--sc-muted);
	white-space: nowrap;
}

.sc-app .sc-btn {
	appearance: none;
	border: 1px solid var(--sc-accent);
	background: var(--sc-accent);
	color: var(--sc-accent-ink);
	padding: .35rem .8rem;
	border-radius: 4px;
	font-size: .8rem;
	font-weight: 600;
	cursor: pointer;
	line-height: 1.5;
}

.sc-app .sc-btn:hover { filter: brightness(1.08); }

/* ----------------------------------------------------------------- tables */

.sc-app .sc-table-wrap {
	overflow-x: auto;
	border: 1px solid var(--sc-rule);
	border-radius: 4px;
	margin-top: 1rem;
	-webkit-overflow-scrolling: touch;
}

.sc-app .sc-table {
	width: 100%;
	min-width: 380px;
	border-collapse: collapse;
	font-size: .85rem;
	margin: 0;
	background: var(--sc-surface);
}

.sc-app .sc-table th,
.sc-app .sc-table td {
	padding: .44rem .7rem;
	text-align: left;
	border-bottom: 1px solid var(--sc-rule-soft);
	vertical-align: top;
	background: transparent;
}

.sc-app .sc-table th {
	position: sticky;
	top: 0;
	background: var(--sc-surface-2);
	font-size: .7rem;
	font-weight: 600;
	letter-spacing: .07em;
	text-transform: uppercase;
	color: var(--sc-muted);
	border-bottom: 1px solid var(--sc-rule);
	white-space: nowrap;
}

.sc-app .sc-table tbody tr:last-child td { border-bottom: 0; }
.sc-app .sc-table tbody tr:hover td { background: var(--sc-surface-2); }

.sc-app .sc-num {
	text-align: right;
	font-family: var(--sc-mono);
	font-variant-numeric: tabular-nums;
	white-space: nowrap;
}

.sc-app .sc-sym { font-family: var(--sc-mono); color: var(--sc-accent); white-space: nowrap; }
.sc-app .sc-uname { color: var(--sc-ink-2); }
.sc-app .sc-empty { color: var(--sc-muted); text-align: center; }

.sc-app .sc-table tr.is-target td { background: var(--sc-accent-wash); font-weight: 600; }
.sc-app .sc-table tr.is-source td { background: var(--sc-surface-2); }

.sc-app .sc-copyable { cursor: pointer; }
.sc-app .sc-copyable.is-copied { color: var(--sc-good); }

.sc-app .sc-badge {
	display: inline-block;
	margin-left: .45rem;
	padding: .04rem .38rem;
	font-size: .64rem;
	letter-spacing: .06em;
	text-transform: uppercase;
	border: 1px solid var(--sc-rule);
	border-radius: 2px;
	color: var(--sc-muted);
	vertical-align: 1px;
}

/* ------------------------------------------------------------ molar mass */

.sc-app .sc-formula { font-family: var(--sc-mono); font-size: 1.05rem; }

.sc-app .sc-chips { display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: 1rem; }

.sc-app .sc-chip {
	appearance: none;
	border: 1px solid var(--sc-rule);
	background: var(--sc-surface-2);
	color: var(--sc-ink-2);
	font-family: var(--sc-mono);
	font-size: .76rem;
	padding: .22rem .55rem;
	border-radius: 99px;
	cursor: pointer;
}

.sc-app .sc-chip:hover { border-color: var(--sc-accent); color: var(--sc-accent); }

.sc-app .sc-bignum {
	display: flex;
	align-items: baseline;
	gap: .45rem;
	padding: .8rem 1rem;
	background: var(--sc-accent-wash);
	border-radius: 4px;
}

.sc-app .sc-bignum-value {
	font-family: var(--sc-mono);
	font-size: 1.7rem;
	font-weight: 500;
	line-height: 1.1;
	font-variant-numeric: tabular-nums;
}

.sc-app .sc-bignum-unit { font-size: .9rem; color: var(--sc-muted); }

.sc-app .sc-error { color: var(--sc-error); font-size: .87rem; margin: 0; }

.sc-app .sc-prep {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
	gap: .8rem;
	align-items: end;
}

.sc-app .sc-field { display: flex; flex-direction: column; gap: .3rem; min-width: 0; }
.sc-app .sc-field-inner { display: flex; gap: .4rem; }
.sc-app .sc-field-inner .sc-select { width: auto; flex: 0 0 5.5rem; }

.sc-app .sc-prep-out {
	font-family: var(--sc-mono);
	font-size: 1.15rem;
	font-weight: 500;
	padding: .55rem .7rem;
	min-height: 2.5rem;
	background: var(--sc-accent-wash);
	border: 1px solid var(--sc-accent);
	border-radius: 4px;
	white-space: nowrap;
	overflow-x: auto;
}

/* ----------------------------------------------------------------- footer */

.sc-app .sc-foot {
	margin: 0;
	padding: .6rem 1.25rem .7rem;
	font-size: .74rem;
	color: var(--sc-muted);
	background: var(--sc-surface-2);
	border-top: 1px solid var(--sc-rule);
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 640px) {
	.sc-app { font-size: 14px; }
	.sc-app .sc-panel { padding: 1rem .9rem 1.2rem; }

	.sc-app .sc-convert {
		grid-template-columns: minmax(0, 1fr);
		gap: .55rem;
	}

	.sc-app .sc-swap { justify-self: center; transform: rotate(90deg); }

	.sc-app .sc-row-spec { grid-template-columns: minmax(0, 1fr); }

	.sc-app .sc-result { grid-template-columns: 4.5rem minmax(0, 1fr); }
	.sc-app .sc-result-cat { grid-column: 2; }

	.sc-app .sc-tab { padding: .6rem .7rem; font-size: .8rem; flex: 1 1 auto; text-align: center; }

	/* On a phone the unit name is the least useful column: drop it so the
	   symbol and the value both fit without sideways scrolling. */
	.sc-app .sc-table-units { min-width: 0; }
	.sc-app .sc-table-units th:nth-child(2),
	.sc-app .sc-table-units td:nth-child(2) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
	.sc-app * { transition: none !important; animation: none !important; }
}

@media print {
	.sc-app .sc-tabs, .sc-app .sc-controls, .sc-app .sc-swap { display: none; }
	.sc-app { border-color: #999; }
}