/**
 * LabTheme AI chat — floating widget styles (theme tokens from main.css).
 */

.ai-chat-fab {
	position: fixed;
	right: 18px;
	bottom: 76px;
	z-index: 80;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 48px;
	height: 48px;
	color: var(--accent-ink, #06121f);
	background: var(--accent);
	border: none;
	border-radius: 50%;
	box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
	cursor: pointer;
	transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.ai-chat-fab:hover {
	transform: translateY(-2px);
	box-shadow: 0 14px 36px rgba(0, 0, 0, 0.5);
}

.ai-chat {
	position: fixed;
	right: 18px;
	bottom: 136px;
	z-index: 80;
	width: min(360px, calc(100vw - 36px));
	opacity: 0;
	transform: translateY(12px) scale(0.98);
	transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.ai-chat.is-open {
	opacity: 1;
	transform: none;
}

.ai-chat__panel {
	display: flex;
	flex-direction: column;
	max-height: min(520px, 70vh);
	background: rgba(13, 19, 30, 0.97);
	border: 1px solid var(--line-strong);
	border-radius: var(--radius, 16px);
	box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
	overflow: hidden;
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
}

.ai-chat__head {
	display: flex;
	align-items: baseline;
	gap: 8px;
	padding: 14px 16px 10px;
	border-bottom: 1px solid var(--line);
}

.ai-chat__title {
	font-weight: 700;
	color: var(--paper);
}

.ai-chat__sub {
	font-size: 0.72rem;
	color: var(--muted-2);
	margin-right: auto;
}

.ai-chat__close {
	border: none;
	background: none;
	color: var(--muted-2);
	font-size: 1.2rem;
	line-height: 1;
	cursor: pointer;
	padding: 2px 6px;
}

.ai-chat__close:hover {
	color: var(--paper);
}

.ai-chat__log {
	flex: 1;
	overflow-y: auto;
	padding: 12px 14px;
	display: grid;
	gap: 10px;
	align-content: start;
}

.ai-chat__msg {
	display: flex;
}

.ai-chat__msg--user {
	justify-content: flex-end;
}

.ai-chat__bubble {
	max-width: 86%;
	padding: 9px 12px;
	font-size: 0.88rem;
	line-height: 1.65;
	border-radius: 14px;
	white-space: pre-wrap;
	word-break: break-word;
	color: var(--paper-soft);
	background: rgba(255, 255, 255, 0.05);
	border: 1px solid var(--line);
	border-bottom-left-radius: 4px;
}

.ai-chat__msg--user .ai-chat__bubble {
	color: var(--accent-ink, #06121f);
	background: var(--accent);
	border-color: transparent;
	border-bottom-left-radius: 14px;
	border-bottom-right-radius: 4px;
}

.ai-chat__msg.is-typing .ai-chat__bubble {
	color: var(--muted-2);
	font-style: italic;
}

.ai-chat__msg.is-error .ai-chat__bubble {
	color: #ffb4b0;
	border-color: rgba(255, 130, 130, 0.4);
}

.ai-chat__cite {
	display: inline;
	margin: 0 2px;
	color: var(--accent);
	text-decoration: underline;
	text-underline-offset: 3px;
}

.ai-chat__login {
	display: inline-block;
	margin-top: 6px;
	color: var(--accent);
}

.ai-chat__meta {
	padding: 0 16px 8px;
	font-size: 0.72rem;
	color: var(--muted-2);
	min-height: 1em;
}

.ai-chat__points-link {
	color: var(--muted-2);
	text-decoration: none;
}

.ai-chat__points-link:hover {
	color: var(--accent);
}

.ai-chat__form {
	display: flex;
	gap: 8px;
	padding: 10px 12px 12px;
	border-top: 1px solid var(--line);
}

.ai-chat__input {
	flex: 1;
	min-width: 0;
	padding: 9px 12px;
	font-family: var(--font-sans, sans-serif);
	font-size: 0.88rem;
	color: var(--paper);
	background: rgba(255, 255, 255, 0.04);
	border: 1px solid var(--line);
	border-radius: 10px;
}

.ai-chat__input::placeholder {
	color: var(--muted-2);
}

.ai-chat__send {
	padding: 9px 16px;
	font-size: 0.85rem;
	font-weight: 700;
	color: var(--accent-ink, #06121f);
	background: var(--accent);
	border: none;
	border-radius: 10px;
	cursor: pointer;
}

.ai-chat__send:disabled {
	opacity: 0.5;
	cursor: not-allowed;
}

.ai-chat__input:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 1px;
}

/* Mobile: bottom sheet. */
@media (max-width: 640px) {
	.ai-chat {
		right: 12px;
		left: 12px;
		width: auto;
		bottom: 132px;
	}
}

@media (prefers-reduced-motion: reduce) {
	.ai-chat,
	.ai-chat-fab {
		transition: none;
	}
}

/* ===== Video transcript card (single video page) ===== */
.video-transcript {
	margin-top: 28px;
	padding: 20px 24px;
	background: rgba(255, 255, 255, 0.03);
	border: 1px solid var(--line);
	border-radius: var(--radius, 16px);
}

.video-transcript__title {
	margin: 0 0 6px;
	font-size: 1rem;
	color: var(--paper);
}

.video-transcript__note {
	margin: 0 0 12px;
	font-size: 0.72rem;
	color: var(--muted-2);
}

.video-transcript__body {
	font-size: 0.92rem;
	line-height: 1.85;
	color: var(--paper-soft);
	white-space: pre-wrap;
}

html.paper-mode .single-post .video-transcript,
html.paper-mode .video-transcript {
	background: #eef2f4;
	border-color: rgba(43, 46, 58, 0.16);
}

html.paper-mode .video-transcript__title {
	color: #1f2933;
}

html.paper-mode .video-transcript__body {
	color: #2c2f36;
}