:root {
	--ink: #12353b;
	--muted: #647a7d;
	--sea: #087f86;
	--deep: #07575f;
	--foam: #eaf6f3;
	--coral: #f27d67;
	--sand: #f4bd55;
	--paper: #fffdf8;
	--line: #d5e3df;
	--page: #f4f5ef;
	--shadow: 0 20px 55px rgba(17, 53, 59, .09);
}

* {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	background:
		radial-gradient(circle at 12% 8%, rgba(242, 125, 103, .08), transparent 24rem),
		radial-gradient(circle at 88% 16%, rgba(8, 127, 134, .09), transparent 28rem),
		var(--page);
	color: var(--ink);
	font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

button,
input,
select {
	font: inherit;
}

button {
	color: inherit;
}

.skip-link {
	position: absolute;
	top: -100px;
	left: 18px;
	z-index: 99;
	padding: 10px 15px;
	border-radius: 8px;
	background: var(--deep);
	color: white;
}

.skip-link:focus {
	top: 12px;
}

.site-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 24px;
	max-width: 1580px;
	margin: 0 auto;
	padding: 22px 30px 14px;
}

.brand {
	display: flex;
	align-items: center;
	gap: 12px;
}

.brand-mark {
	display: grid;
	width: 42px;
	height: 42px;
	place-items: center;
	border-radius: 14px;
	background: var(--deep);
	color: white;
	font-family: Georgia, serif;
	font-size: 25px;
	font-weight: 700;
}

.brand div {
	display: flex;
	flex-direction: column;
}

.brand strong {
	font-size: 20px;
}

.brand span,
.library-count span {
	color: var(--muted);
	font-size: 12px;
}

.library-count {
	display: flex;
	align-items: baseline;
	gap: 8px;
}

.library-count strong {
	font-family: Georgia, serif;
	font-size: 27px;
}

.app-shell {
	max-width: 1580px;
	margin: 0 auto;
	padding: 10px 30px 50px;
}

.toolbar {
	display: grid;
	grid-template-columns: minmax(250px, 1.5fr) minmax(180px, .7fr) minmax(140px, .5fr) auto;
	gap: 12px;
	align-items: end;
	margin-bottom: 18px;
	padding: 16px;
	border: 1px solid var(--line);
	border-radius: 20px;
	background: rgba(255, 253, 248, .92);
	box-shadow: 0 10px 30px rgba(17, 53, 59, .05);
}

.field {
	display: flex;
	min-width: 0;
	flex-direction: column;
	gap: 7px;
}

.field span {
	color: var(--muted);
	font-size: 12px;
	font-weight: 800;
	letter-spacing: .04em;
}

.field input,
.field select {
	width: 100%;
	min-height: 45px;
	padding: 10px 12px;
	border: 1px solid #bed1cd;
	border-radius: 12px;
	outline: none;
	background: white;
	color: var(--ink);
}

.field input:focus,
.field select:focus,
.button:focus-visible,
.word-row:focus-visible,
.poster-node:focus-visible,
.connection-chip:focus-visible {
	border-color: var(--sea);
	box-shadow: 0 0 0 3px rgba(8, 127, 134, .15);
}

.button {
	min-height: 42px;
	padding: 9px 14px;
	border: 1px solid #b9d0cc;
	border-radius: 999px;
	background: white;
	cursor: pointer;
	font-weight: 800;
}

.button:hover:not(:disabled) {
	border-color: var(--sea);
	background: var(--foam);
}

.button:disabled {
	cursor: not-allowed;
	opacity: .45;
}

.button--quiet {
	color: var(--deep);
}

.button--primary {
	border-color: var(--deep);
	background: var(--deep);
	color: white;
}

.button--primary:hover:not(:disabled) {
	background: var(--sea);
	color: white;
}

.content-grid {
	display: grid;
	grid-template-columns: minmax(270px, 330px) minmax(0, 1fr);
	gap: 18px;
	align-items: start;
}

.word-browser,
.workspace,
.detail-panel {
	border: 1px solid var(--line);
	border-radius: 24px;
	background: rgba(255, 253, 248, .96);
	box-shadow: var(--shadow);
}

.word-browser {
	position: sticky;
	top: 16px;
	padding: 18px;
}

.browser-head,
.workspace-nav,
.pager {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 10px;
}

.browser-head h1 {
	margin: 4px 0 0;
	font-family: Georgia, "Noto Serif SC", serif;
	font-size: 28px;
	font-weight: 700;
}

.browser-head > strong {
	display: grid;
	min-width: 58px;
	height: 38px;
	place-items: center;
	border-radius: 999px;
	background: var(--foam);
	color: var(--deep);
	font-size: 13px;
}

.eyebrow {
	color: var(--sea);
	font-size: 10px;
	font-weight: 900;
	letter-spacing: .17em;
}

.browser-status {
	min-height: 19px;
	margin: 12px 0 10px;
	color: var(--muted);
	font-size: 12px;
}

.word-list {
	display: grid;
	gap: 7px;
	max-height: 610px;
	overflow: auto;
	padding-right: 5px;
	scrollbar-color: #a9c9c4 transparent;
}

.word-row {
	display: grid;
	grid-template-columns: minmax(0, 1fr) auto;
	gap: 8px;
	align-items: center;
	width: 100%;
	padding: 10px 11px;
	border: 1px solid transparent;
	border-radius: 12px;
	background: #f8faf7;
	text-align: left;
	cursor: pointer;
}

.word-row:hover {
	border-color: #c7dbd7;
	background: var(--foam);
}

.word-row[aria-current="true"] {
	border-color: var(--sea);
	background: var(--deep);
	color: white;
}

.word-row__copy {
	min-width: 0;
}

.word-row strong,
.word-row small {
	display: block;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.word-row strong {
	font-size: 15px;
}

.word-row small {
	margin-top: 3px;
	color: var(--muted);
	font-size: 11px;
}

.word-row[aria-current="true"] small {
	color: rgba(255, 255, 255, .72);
}

.word-row__course {
	color: var(--muted);
	font-size: 10px;
}

.word-row[aria-current="true"] .word-row__course {
	color: white;
}

.pager {
	margin-top: 12px;
}

.pager span,
.workspace-nav span {
	color: var(--muted);
	font-size: 12px;
	font-weight: 800;
}

.workspace {
	min-width: 0;
	padding: 18px;
}

.workspace-nav {
	margin-bottom: 14px;
}

.poster {
	position: relative;
	display: grid;
	grid-template-columns: 1fr 1fr 1.2fr 1fr 1fr;
	grid-template-rows: minmax(112px, auto) minmax(112px, auto) minmax(112px, auto) minmax(112px, auto) minmax(112px, auto);
	gap: 12px;
	padding: 18px;
	border: 1px solid #d6e3df;
	border-radius: 22px;
	background:
		linear-gradient(rgba(8, 127, 134, .035) 1px, transparent 1px),
		linear-gradient(90deg, rgba(8, 127, 134, .035) 1px, transparent 1px),
		linear-gradient(145deg, #fbfefb, #f5f7f1);
	background-size: 28px 28px, 28px 28px, auto;
	overflow: hidden;
}

.poster-lines {
	position: absolute;
	inset: 18px;
	z-index: 0;
	width: calc(100% - 36px);
	height: calc(100% - 36px);
	pointer-events: none;
}

.poster-line {
	stroke: #b7d6d1;
	stroke-width: 1.4;
	transition: stroke .18s, stroke-width .18s, opacity .18s;
}

.poster-line.is-active {
	stroke: var(--coral);
	stroke-width: 3;
}

.poster-node,
.poster-center {
	position: relative;
	z-index: 1;
	border: 1px solid #c9ddd8;
	border-radius: 18px;
	background: rgba(255, 255, 255, .96);
	box-shadow: 0 9px 24px rgba(18, 50, 58, .07);
}

.poster-node {
	display: flex;
	min-width: 0;
	flex-direction: column;
	align-items: flex-start;
	justify-content: center;
	padding: 14px;
	text-align: left;
	cursor: pointer;
	transition: transform .18s, border-color .18s, background .18s;
}

.poster-node:hover,
.poster-node:focus-visible,
.poster-node[aria-pressed="true"] {
	transform: translateY(-2px);
	border-color: var(--sea);
	background: var(--foam);
}

.poster-node b {
	display: block;
	margin-bottom: 5px;
	color: var(--sea);
	font-size: 10px;
	letter-spacing: .12em;
	text-transform: uppercase;
}

.poster-node strong,
.poster-node small {
	display: block;
	max-width: 100%;
	overflow-wrap: anywhere;
}

.poster-node strong {
	font-size: 16px;
	line-height: 1.32;
}

.poster-node small {
	margin-top: 5px;
	color: var(--muted);
	font-size: 11px;
	line-height: 1.45;
}

.poster-node .poster-note-secondary {
	margin-top: 7px;
	color: var(--deep);
	font-size: 10px;
	line-height: 1.55;
}

.poster-node--1 {
	grid-column: 1 / 3;
	grid-row: 1;
}

.poster-node--2 {
	grid-column: 4 / 6;
	grid-row: 1;
}

.poster-node--3 {
	grid-column: 1;
	grid-row: 2 / 4;
}

.poster-node--4 {
	grid-column: 5;
	grid-row: 2 / 4;
}

.poster-node--5 {
	grid-column: 1 / 3;
	grid-row: 4;
}

.poster-node--6 {
	grid-column: 4 / 6;
	grid-row: 4;
}

.poster-node--7 {
	grid-column: 1 / 3;
	grid-row: 5;
}

.poster-node--8 {
	grid-column: 4 / 6;
	grid-row: 5;
}

.poster-center {
	grid-column: 2 / 5;
	grid-row: 2 / 4;
	display: flex;
	min-height: 250px;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 26px;
	border: 2px solid var(--sea);
	background: linear-gradient(145deg, #fff, #edf8f5);
	text-align: center;
}

.poster-center__status {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	margin-bottom: 14px;
	padding: 5px 9px;
	border-radius: 999px;
	background: var(--foam);
	color: var(--deep);
	font-size: 10px;
	font-weight: 900;
	letter-spacing: .08em;
}

.poster-center__status.is-review {
	background: #fff3d8;
	color: #785514;
}

.poster-center__word {
	max-width: 100%;
	margin: 0;
	font-family: Georgia, "Noto Serif SC", serif;
	font-size: clamp(42px, 5vw, 68px);
	line-height: 1;
	overflow-wrap: anywhere;
}

.poster-center__meaning {
	margin: 13px 0 5px;
	font-size: 17px;
	font-weight: 800;
}

.poster-center__ipa {
	margin: 0;
	color: var(--muted);
	font-size: 12px;
}

.poster-center__actions {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 8px;
	margin-top: 19px;
}

.detail-panel {
	margin-top: 14px;
	padding: 20px;
	box-shadow: none;
}

.detail-panel h2 {
	margin: 0 0 7px;
	font-family: Georgia, "Noto Serif SC", serif;
	font-size: 25px;
}

.detail-intro {
	margin: 0 0 16px;
	color: var(--muted);
	line-height: 1.75;
}

.detail-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
	gap: 10px;
}

.detail-item {
	padding: 13px;
	border-left: 3px solid var(--sea);
	background: var(--foam);
}

.detail-item b,
.detail-item span,
.detail-item small {
	display: block;
}

.detail-item b {
	margin-bottom: 5px;
}

.detail-item span {
	line-height: 1.6;
}

.detail-item small {
	margin-top: 6px;
	color: var(--muted);
	line-height: 1.5;
}

.detail-item--wide {
	grid-column: 1 / -1;
}

.learning-detail {
	position: relative;
}

.learning-detail--origin {
	border-left-color: var(--coral);
	background: #fff3ed;
}

.learning-detail--semantic {
	border-left-color: var(--sand);
	background: #fff8e8;
}

.learning-detail--memory {
	border-left-color: #7b66c7;
	background: #f3f0ff;
}

.learning-detail--warning {
	border-left-color: #d86155;
	background: #fff0ee;
}

.detail-status-note {
	grid-column: 1 / -1;
	margin: 0;
	padding: 9px 12px;
	border-radius: 10px;
	background: #f2f5f3;
	color: var(--muted);
	font-size: 12px;
	line-height: 1.6;
}

.example-card {
	background: #f8fcfb;
}

.example-en {
	color: var(--ink);
	font-size: 16px;
	font-weight: 650;
	line-height: 1.65;
}

.detail-item .example-zh {
	margin-top: 7px;
	color: #365f63;
	font-size: 14px;
	line-height: 1.7;
}

.detail-item .example-zh--missing {
	color: #8f7772;
	font-style: italic;
}

.detail-item .example-translation-label {
	display: inline-flex;
	width: fit-content;
	margin-top: 6px;
	padding: 2px 7px;
	border-radius: 999px;
	background: #e9f2ef;
	color: var(--muted);
	font-size: 11px;
	line-height: 1.5;
}

.chip-row {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
}

.tag,
.connection-chip {
	display: inline-flex;
	align-items: center;
	min-height: 31px;
	padding: 5px 9px;
	border: 1px solid #bcd4cf;
	border-radius: 999px;
	background: white;
	color: var(--deep);
	font-size: 12px;
	font-weight: 800;
}

.connection-chip {
	cursor: pointer;
}

.connection-chip:hover {
	border-color: var(--sea);
	background: var(--foam);
}

.empty-note,
.quality-note {
	margin: 0;
	padding: 13px 15px;
	border-left: 4px solid var(--sand);
	background: #fff7e4;
	color: #6c5524;
	line-height: 1.7;
}

.retrieval-prompt {
	padding: 20px;
	border: 1px dashed var(--sea);
	background: #f2faf8;
	text-align: center;
}

.retrieval-prompt strong {
	display: block;
	margin-bottom: 7px;
	font-size: 20px;
}

.is-answer-hidden .poster-center__word,
.is-answer-hidden .poster-center__meaning,
.is-answer-hidden .poster-center__ipa {
	filter: blur(10px);
	user-select: none;
}

@media (max-width: 1120px) {
	.content-grid {
		grid-template-columns: 270px minmax(0, 1fr);
	}

	.poster {
		grid-template-columns: 1fr 1fr;
		grid-template-rows: auto;
	}

	.poster-lines {
		display: none;
	}

	.poster-center {
		grid-column: 1 / -1;
		grid-row: 1;
		min-height: 230px;
	}

	.poster-node,
	.poster-node--1,
	.poster-node--2,
	.poster-node--3,
	.poster-node--4,
	.poster-node--5,
	.poster-node--6,
	.poster-node--7,
	.poster-node--8 {
		grid-column: auto;
		grid-row: auto;
		min-height: 118px;
	}
}

@media (max-width: 820px) {
	.site-header,
	.app-shell {
		padding-left: 16px;
		padding-right: 16px;
	}

	.toolbar {
		grid-template-columns: 1fr 1fr;
	}

	.field--search {
		grid-column: 1 / -1;
	}

	.content-grid {
		grid-template-columns: 1fr;
	}

	.word-browser {
		position: static;
	}

	.word-list {
		max-height: 330px;
	}
}

@media (max-width: 540px) {
	.site-header {
		align-items: flex-start;
	}

	.library-count {
		flex-direction: column;
		align-items: flex-end;
		gap: 0;
	}

	.toolbar {
		grid-template-columns: 1fr;
	}

	.field--search {
		grid-column: auto;
	}

	.toolbar .button {
		width: 100%;
	}

	.workspace {
		padding: 10px;
	}

	.workspace-nav .button {
		padding: 8px 10px;
		font-size: 12px;
	}

	.poster {
		grid-template-columns: 1fr;
		padding: 12px;
	}

	.poster-center,
	.poster-node,
	.poster-node--1,
	.poster-node--2,
	.poster-node--3,
	.poster-node--4,
	.poster-node--5,
	.poster-node--6,
	.poster-node--7,
	.poster-node--8 {
		grid-column: 1;
		grid-row: auto;
		min-height: 0;
	}

	.poster-center {
		min-height: 230px;
	}

	.poster-center__word {
		font-size: 42px;
	}

	.detail-panel {
		padding: 16px;
	}
}

@media (prefers-reduced-motion: reduce) {
	* {
		scroll-behavior: auto !important;
		transition: none !important;
	}
}

.return-home {
	display: inline-flex;
	align-items: center;
	min-height: 40px;
	padding: 0 14px;
	border: 1px solid var(--line);
	border-radius: 999px;
	color: var(--ink);
	background: white;
	font-size: 13px;
	font-weight: 800;
	text-decoration: none;
}