:root {
	color-scheme: light dark;
	--bg: #f5f6f8;
	--fg: #1a1a1a;
	--muted: #65676b;
	--card-bg: #ffffff;
	--border: #dadde1;
	--accent: #2563eb;
	--error-bg: #fdecea;
	--error-fg: #b3261e;
	--warn-bg: #fff4e0;
	--warn-fg: #8a5a00;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #15181c;
		--fg: #e8e9ea;
		--muted: #9aa0a6;
		--card-bg: #1f2327;
		--border: #33383e;
		--accent: #5b9bff;
		--error-bg: #3a1f1e;
		--error-fg: #ff8a80;
		--warn-bg: #3a2f14;
		--warn-fg: #ffc55c;
	}
}

/* Explicit user choice always wins over the system preference above. */
html[data-theme="light"] {
	color-scheme: light;
	--bg: #f5f6f8;
	--fg: #1a1a1a;
	--muted: #65676b;
	--card-bg: #ffffff;
	--border: #dadde1;
	--accent: #2563eb;
	--error-bg: #fdecea;
	--error-fg: #b3261e;
	--warn-bg: #fff4e0;
	--warn-fg: #8a5a00;
}

html[data-theme="dark"] {
	color-scheme: dark;
	--bg: #15181c;
	--fg: #e8e9ea;
	--muted: #9aa0a6;
	--card-bg: #1f2327;
	--border: #33383e;
	--accent: #5b9bff;
	--error-bg: #3a1f1e;
	--error-fg: #ff8a80;
	--warn-bg: #3a2f14;
	--warn-fg: #ffc55c;
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--fg);
	font-family:
		-apple-system,
		BlinkMacSystemFont,
		"Segoe UI",
		Roboto,
		Helvetica,
		Arial,
		sans-serif;
}

.page {
	max-width: 1080px;
	margin: 0 auto;
	padding: 2.5rem 1.25rem 4rem;
}

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

.brand .logo {
	height: 32px;
	width: auto;
	margin-bottom: 0.75rem;
	display: block;
}

.controls {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	flex-shrink: 0;
}

.lang-switch {
	display: flex;
	border: 1px solid var(--border);
	border-radius: 8px;
	overflow: hidden;
}

.lang-switch button {
	border: none;
	background: var(--card-bg);
	color: var(--muted);
	font-size: 0.8rem;
	padding: 0.4rem 0.65rem;
	cursor: pointer;
}

.lang-switch button + button {
	border-left: 1px solid var(--border);
}

.lang-switch button.active {
	background: var(--accent);
	color: #fff;
}

.theme-toggle {
	border: 1px solid var(--border);
	background: var(--card-bg);
	color: var(--fg);
	border-radius: 8px;
	width: 2.15rem;
	height: 2.15rem;
	font-size: 1rem;
	line-height: 1;
	cursor: pointer;
}

@media (prefers-color-scheme: dark) {
	html:not([data-theme="light"]) .header .logo {
		filter: invert(1);
	}
}

html[data-theme="dark"] .header .logo {
	filter: invert(1);
}

.header h1 {
	margin: 0 0 0.35rem;
	font-size: 1.75rem;
}

.header p {
	margin: 0;
	color: var(--muted);
	max-width: 640px;
}

.tabs {
	display: flex;
	gap: 0.4rem;
	margin-top: 1.75rem;
	border-bottom: 1px solid var(--border);
}

.tab-button {
	border: none;
	background: none;
	color: var(--muted);
	font-size: 0.9rem;
	font-weight: 600;
	padding: 0.6rem 0.2rem;
	margin-right: 1rem;
	cursor: pointer;
	border-bottom: 2px solid transparent;
}

.tab-button.active {
	color: var(--fg);
	border-bottom-color: var(--accent);
}

.tab-panel {
	max-width: 640px;
}

.check-form {
	display: flex;
	gap: 0.5rem;
	margin: 1rem 0 1rem;
}

.manual-form {
	display: flex;
	flex-direction: column;
	gap: 0.85rem;
	margin: 1rem 0;
}

.field {
	display: flex;
	flex-direction: column;
	gap: 0.3rem;
}

.field label {
	font-size: 0.8rem;
	color: var(--muted);
}

.field input,
.field textarea {
	padding: 0.6rem 0.75rem;
	border-radius: 8px;
	border: 1px solid var(--border);
	background: var(--card-bg);
	color: var(--fg);
	font-size: 0.95rem;
	font-family: inherit;
	resize: vertical;
}

.file-input-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.file-input-row {
	display: flex;
	align-items: center;
	gap: 0.6rem;
}

.file-button {
	padding: 0.45rem 0.85rem;
	border-radius: 8px;
	border: 1px solid var(--border);
	background: var(--card-bg);
	color: var(--fg);
	font-size: 0.85rem;
	cursor: pointer;
	flex-shrink: 0;
}

.file-input-hidden:focus-visible + .file-button {
	outline: 2px solid var(--accent);
	outline-offset: 1px;
}

.file-name {
	font-size: 0.85rem;
	color: var(--muted);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

#manual-button {
	align-self: flex-start;
	padding: 0.65rem 1.25rem;
	border-radius: 8px;
	border: none;
	background: var(--accent);
	color: #fff;
	font-size: 1rem;
	font-weight: 600;
	cursor: pointer;
}

#url-input {
	flex: 1;
	padding: 0.65rem 0.85rem;
	border-radius: 8px;
	border: 1px solid var(--border);
	background: var(--card-bg);
	color: var(--fg);
	font-size: 1rem;
}

#check-button {
	padding: 0.65rem 1.25rem;
	border-radius: 8px;
	border: none;
	background: var(--accent);
	color: #fff;
	font-size: 1rem;
	font-weight: 600;
	cursor: pointer;
}

#check-button:disabled {
	opacity: 0.6;
	cursor: default;
}

.error {
	background: var(--error-bg);
	color: var(--error-fg);
	padding: 0.75rem 1rem;
	border-radius: 8px;
	font-size: 0.9rem;
	max-width: 640px;
}

.loading {
	color: var(--muted);
	font-size: 0.9rem;
}

.results {
	margin-top: 1rem;
}

.cards-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
	gap: 1.75rem;
	margin-bottom: 2.5rem;
}

.card-group h2 {
	font-size: 0.95rem;
	text-transform: uppercase;
	letter-spacing: 0.04em;
	color: var(--muted);
	margin: 0 0 0.6rem;
}

.platform-header {
	display: flex;
	align-items: center;
	gap: 0.45rem;
	margin-bottom: 0.5rem;
}

.platform-dot {
	width: 10px;
	height: 10px;
	border-radius: 50%;
	flex-shrink: 0;
}

.platform-label {
	font-weight: 600;
	font-size: 0.9rem;
}

.mock-site {
	font-size: 0.72rem;
	text-transform: uppercase;
	color: var(--muted);
	letter-spacing: 0.02em;
}

.mock-title {
	font-weight: 600;
	line-height: 1.3;
	margin-top: 0.15rem;
}

.mock-desc {
	font-size: 0.85rem;
	color: var(--muted);
	margin-top: 0.2rem;
	line-height: 1.35;
}

/* Large card: Facebook / LinkedIn / LINE */
.large-card {
	border: 1px solid var(--border);
	border-radius: 8px;
	overflow: hidden;
	background: var(--card-bg);
}

.large-image-wrap {
	width: 100%;
	aspect-ratio: 1.91 / 1;
	background: var(--border);
	overflow: hidden;
}

.large-image {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.large-body {
	padding: 0.7rem 0.85rem;
	border-top: 1px solid var(--border);
}

/* Rounded card: X */
.rounded-card {
	border: 1px solid var(--border);
	border-radius: 16px;
	overflow: hidden;
	background: var(--card-bg);
}

.rounded-image-wrap {
	width: 100%;
	aspect-ratio: 1.91 / 1;
	background: var(--border);
	overflow: hidden;
}

.rounded-image {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

.rounded-body {
	padding: 0.7rem 0.85rem;
}

.rounded-body .mock-site {
	text-transform: none;
	font-size: 0.8rem;
	margin-top: 0.35rem;
}

/* Compact row card: WhatsApp / WeChat */
.compact-card {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	border: 1px solid var(--border);
	border-radius: 8px;
	background: var(--card-bg);
	padding: 0.65rem;
}

.compact-body {
	flex: 1;
	min-width: 0;
}

.compact-title {
	margin-top: 0;
}

.compact-thumb {
	width: 64px;
	height: 64px;
	flex-shrink: 0;
	border-radius: 6px;
	overflow: hidden;
	background: var(--border);
}

.compact-image {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
}

/* Chat embed card: Slack / Discord */
.chat-card {
	display: flex;
	border-radius: 6px;
	overflow: hidden;
	max-width: 100%;
}

.chat-theme-light {
	background: var(--card-bg);
	border: 1px solid var(--border);
}

.chat-theme-dark {
	background: #2b2d31;
	border: 1px solid #1e1f22;
}

.chat-theme-dark .mock-site,
.chat-theme-dark .mock-desc {
	color: #b5bac1;
}

.chat-accent {
	width: 4px;
	flex-shrink: 0;
}

.chat-body {
	padding: 0.6rem 0.85rem;
	flex: 1;
	min-width: 0;
}

.chat-title {
	margin-top: 0.1rem;
}

.chat-image {
	margin-top: 0.5rem;
	max-width: 100%;
	max-height: 160px;
	border-radius: 4px;
	object-fit: cover;
	display: block;
}

/* Raw tag table */
.raw-table {
	width: 100%;
	border-collapse: collapse;
	font-size: 0.85rem;
	background: var(--card-bg);
	border: 1px solid var(--border);
	border-radius: 8px;
	overflow: hidden;
}

.raw-table td {
	padding: 0.5rem 0.75rem;
	border-top: 1px solid var(--border);
	vertical-align: top;
	word-break: break-word;
}

.raw-table tr:first-child td {
	border-top: none;
}

.raw-table td:first-child {
	color: var(--muted);
	white-space: nowrap;
	width: 1%;
	font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.empty-hint {
	color: var(--muted);
	font-size: 0.85rem;
}

.warnings {
	list-style: none;
	margin: 0.5rem 0 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 0.3rem;
}

.warnings li {
	display: flex;
	gap: 0.4rem;
	align-items: baseline;
	font-size: 0.8rem;
	color: var(--warn-fg);
	background: var(--warn-bg);
	padding: 0.4rem 0.6rem;
	border-radius: 6px;
}

.warnings li::before {
	content: "⚠";
	flex-shrink: 0;
}