:root {
	--bg: #f6f7f9;
	--panel: #ffffff;
	--text: #20242a;
	--muted: #667085;
	--border: #d9dee7;
	--accent: #0f766e;
	--accent-dark: #115e59;
	--danger: #b42318;
	--danger-bg: #fff1f0;
	--code-bg: #111827;
	--code-text: #e5e7eb;
	--key: #67e8f9;
	--string: #86efac;
	--number: #fbbf24;
	--boolean: #93c5fd;
	--null: #f0abfc;
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	min-height: 100vh;
	background: var(--bg);
	color: var(--text);
	font-family: Arial, "Noto Sans TC", sans-serif;
}

button,
input,
select,
textarea {
	font: inherit;
}

.topbar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding: 20px 28px;
	border-bottom: 1px solid var(--border);
	background: var(--panel);
}

.eyebrow {
	margin: 0 0 4px;
	color: var(--muted);
	font-size: 13px;
}

h1,
h2 {
	margin: 0;
	letter-spacing: 0;
}

h1 {
	font-size: 28px;
}

h2 {
	font-size: 16px;
}

.status {
	min-width: 120px;
	padding: 8px 10px;
	border: 1px solid var(--border);
	border-radius: 6px;
	color: var(--muted);
	text-align: center;
	background: #fbfcfe;
}

.status.is-valid {
	color: var(--accent-dark);
	border-color: #99f6e4;
	background: #ecfdf5;
}

.status.is-error {
	color: var(--danger);
	border-color: #fecaca;
	background: var(--danger-bg);
}

.workspace {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
	gap: 18px;
	padding: 18px;
}

.pane {
	display: flex;
	min-width: 0;
	min-height: 500px;
	flex-direction: column;
	border: 1px solid var(--border);
	border-radius: 8px;
	background: var(--panel);
	overflow: hidden;
}

.encode-pane {
	grid-column: 1 / -1;
	min-height: 460px;
}

.pane-header,
.meta-row,
.form-row {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 10px;
	padding: 12px 14px;
	border-bottom: 1px solid var(--border);
}

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

button,
input,
select {
	height: 34px;
	border: 1px solid var(--border);
	border-radius: 6px;
	background: #ffffff;
	color: var(--text);
}

button {
	padding: 0 12px;
	cursor: pointer;
}

button:hover,
input:hover,
select:hover {
	border-color: #9aa4b2;
}

#decodeBtn,
#encodeBtn {
	border-color: var(--accent);
	background: var(--accent);
	color: #ffffff;
}

textarea {
	width: 100%;
	min-height: 260px;
	padding: 14px;
	border: 0;
	resize: vertical;
	outline: none;
	color: #1f2937;
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
	font-size: 14px;
	line-height: 1.55;
}

#tokenInput {
	flex: 1;
}

.meta-row {
	justify-content: flex-start;
	color: var(--muted);
	font-size: 13px;
}

.error-box {
	padding: 10px 14px;
	border-top: 1px solid #fecaca;
	color: var(--danger);
	background: var(--danger-bg);
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
	font-size: 13px;
	line-height: 1.5;
}

.result-grid {
	display: grid;
	grid-template-rows: auto auto 1fr;
	gap: 12px;
	padding: 14px;
	overflow: auto;
}

.result-block {
	min-width: 0;
}

.block-title {
	margin-bottom: 6px;
	color: var(--muted);
	font-size: 13px;
}

pre {
	margin: 0;
	padding: 14px;
	overflow: auto;
	border-radius: 8px;
	background: var(--code-bg);
	color: var(--code-text);
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
	font-size: 14px;
	line-height: 1.55;
	white-space: pre-wrap;
	word-break: break-word;
}

.claims {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
	gap: 8px;
}

.claim-item {
	padding: 10px;
	border: 1px solid var(--border);
	border-radius: 8px;
	background: #fbfcfe;
}

.claim-label {
	display: block;
	margin-bottom: 4px;
	color: var(--muted);
	font-size: 12px;
}

.claim-value {
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
	font-size: 13px;
}

.form-row {
	justify-content: flex-start;
	flex-wrap: wrap;
}

.form-row label {
	color: var(--muted);
	font-size: 13px;
}

.form-row input {
	min-width: 240px;
	padding: 0 10px;
}

.editor-pair {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
	gap: 1px;
	border-bottom: 1px solid var(--border);
	background: var(--border);
}

.editor-pair label {
	display: flex;
	flex-direction: column;
	gap: 8px;
	padding: 12px 14px;
	background: var(--panel);
	color: var(--muted);
	font-size: 13px;
}

.editor-pair textarea {
	min-height: 220px;
	border: 1px solid var(--border);
	border-radius: 8px;
}

.token-output {
	min-height: 100px;
	border-radius: 0;
}

.token-key {
	color: var(--key);
}

.token-string {
	color: var(--string);
}

.token-number {
	color: var(--number);
}

.token-boolean {
	color: var(--boolean);
}

.token-null {
	color: var(--null);
}

@media (max-width: 900px) {
	.topbar {
		align-items: flex-start;
		flex-direction: column;
		padding: 16px;
	}

	.status {
		width: 100%;
		text-align: left;
	}

	.workspace,
	.editor-pair {
		grid-template-columns: 1fr;
	}

	.workspace {
		padding: 12px;
	}

	.pane-header {
		align-items: flex-start;
		flex-direction: column;
	}
}