#shareboard-root {
	--sb-bg: #f6f7f9;
	--sb-surface: #ffffff;
	--sb-border: #e2e4e9;
	--sb-text: #1f2328;
	--sb-muted: #6b7280;
	--sb-accent: #2f6feb;
	--sb-accent-hover: #2557c4;
	--sb-danger: #c0392b;
	--sb-radius: 10px;

	all: initial;
	display: block;
	box-sizing: border-box;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	color: var(--sb-text);
	background: var(--sb-bg);
	min-height: 100vh;
	padding: 32px 16px 64px;
}

#shareboard-root *,
#shareboard-root *::before,
#shareboard-root *::after {
	box-sizing: border-box;
	font-family: inherit;
}

#shareboard-root h1,
#shareboard-root h2 {
	margin: 0 0 8px;
	font-weight: 600;
	color: var(--sb-text);
}

#shareboard-root h1 {
	font-size: 22px;
}

#shareboard-root h2 {
	font-size: 16px;
}

#shareboard-root p {
	margin: 0 0 12px;
	line-height: 1.5;
}

.sb-header {
	max-width: 720px;
	margin: 0 auto 20px;
}

.sb-tabs {
	display: flex;
	gap: 4px;
	border-bottom: 1px solid var(--sb-border);
	margin-top: 12px;
}

.sb-tab {
	appearance: none;
	border: none;
	background: none;
	padding: 10px 16px;
	font-size: 14px;
	font-weight: 500;
	color: var(--sb-muted);
	cursor: pointer;
	border-bottom: 2px solid transparent;
}

.sb-tab.is-active {
	color: var(--sb-accent);
	border-bottom-color: var(--sb-accent);
}

main {
	max-width: 720px;
	margin: 0 auto;
}

.sb-panel {
	display: none;
}

.sb-panel.is-active {
	display: block;
}

.sb-hint {
	font-size: 13px;
	color: var(--sb-muted);
}

.sb-textarea {
	width: 100%;
	min-height: 140px;
	resize: vertical;
	padding: 12px 14px;
	border: 1px solid var(--sb-border);
	border-radius: var(--sb-radius);
	background: var(--sb-surface);
	font-size: 14px;
	line-height: 1.5;
	color: var(--sb-text);
}

.sb-textarea:focus {
	outline: 2px solid var(--sb-accent);
	outline-offset: 1px;
}

.sb-row {
	display: flex;
	align-items: center;
	gap: 12px;
	margin-top: 12px;
}

.sb-row-between {
	justify-content: space-between;
	margin-top: 24px;
	margin-bottom: 8px;
}

.sb-btn {
	appearance: none;
	border: 1px solid transparent;
	border-radius: 8px;
	padding: 9px 16px;
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	display: inline-flex;
	align-items: center;
	gap: 6px;
}

.sb-btn-primary {
	background: var(--sb-accent);
	color: #fff;
}

.sb-btn-primary:hover {
	background: var(--sb-accent-hover);
}

.sb-btn-secondary {
	background: var(--sb-surface);
	color: var(--sb-text);
	border-color: var(--sb-border);
}

.sb-btn-secondary:hover {
	border-color: var(--sb-accent);
}

.sb-upload-btn {
	margin: 0;
}

.sb-meta {
	font-size: 12px;
	color: var(--sb-muted);
}

.sb-error {
	font-size: 13px;
	color: var(--sb-danger);
	min-height: 18px;
	margin: 8px 0 0;
}

.sb-file-list {
	list-style: none;
	margin: 0;
	padding: 0;
	border: 1px solid var(--sb-border);
	border-radius: var(--sb-radius);
	background: var(--sb-surface);
	overflow: hidden;
}

.sb-file-list:empty::after {
	content: "No files yet.";
	display: block;
	padding: 14px;
	font-size: 13px;
	color: var(--sb-muted);
}

.sb-file-list li {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	padding: 10px 14px;
	border-bottom: 1px solid var(--sb-border);
	font-size: 13px;
}

.sb-file-list li:last-child {
	border-bottom: none;
}

.sb-file-list a {
	color: var(--sb-accent);
	text-decoration: none;
	word-break: break-all;
}

.sb-file-list a:hover {
	text-decoration: underline;
}

.sb-file-meta {
	color: var(--sb-muted);
	white-space: nowrap;
	font-size: 12px;
}

.sb-card {
	background: var(--sb-surface);
	border: 1px solid var(--sb-border);
	border-radius: var(--sb-radius);
	padding: 18px;
	margin-bottom: 16px;
}

.sb-label {
	display: block;
	font-size: 13px;
	font-weight: 500;
	color: var(--sb-muted);
	margin-bottom: 12px;
}

.sb-input {
	display: block;
	width: 100%;
	margin-top: 6px;
	padding: 9px 12px;
	border: 1px solid var(--sb-border);
	border-radius: 8px;
	font-size: 14px;
	color: var(--sb-text);
	background: var(--sb-surface);
}

.sb-input:focus {
	outline: 2px solid var(--sb-accent);
	outline-offset: 1px;
}

.sb-room-label {
	font-size: 12px;
	color: var(--sb-muted);
	margin-right: 6px;
}

.sb-room-code {
	font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
	font-size: 16px;
	font-weight: 700;
	letter-spacing: 1px;
}

.sb-badge {
	margin-left: 10px;
	background: #e6f4ea;
	color: #1e7e34;
	border-radius: 999px;
	padding: 2px 10px;
	font-size: 11px;
	font-weight: 600;
	vertical-align: middle;
}

@media (max-width: 600px) {
	#shareboard-root {
		padding: 20px 12px 48px;
	}
}