/* YouTube AI Expert — frontend styles. All rules are scoped to .youtube-ai-expert. */

.youtube-ai-expert {
	--ytaie-blue: #2563eb;
	--ytaie-blue-dark: #1d4ed8;
	--ytaie-red: #e11d48;
	--ytaie-ink: #0f172a;
	--ytaie-muted: #64748b;
	--ytaie-line: #e2e8f0;
	--ytaie-surface: #ffffff;
	--ytaie-surface-soft: #f8fafc;
	--ytaie-radius: 16px;
	--ytaie-shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 32px rgba(15, 23, 42, 0.07);

	box-sizing: border-box;
	max-width: 880px;
	margin: 0 auto;
	color: var(--ytaie-ink);
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	font-size: 16px;
	line-height: 1.6;
	text-align: left;
}

.youtube-ai-expert *,
.youtube-ai-expert *::before,
.youtube-ai-expert *::after {
	box-sizing: border-box;
}

.youtube-ai-expert .ytaie-card {
	background: var(--ytaie-surface);
	border: 1px solid var(--ytaie-line);
	border-radius: var(--ytaie-radius);
	box-shadow: var(--ytaie-shadow);
	padding: 24px;
	overflow: hidden;
}

.youtube-ai-expert .ytaie-card--notice {
	text-align: center;
	padding: 32px 24px;
}

/* Header */

.youtube-ai-expert .ytaie-header {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: 16px;
	padding-bottom: 18px;
	border-bottom: 1px solid var(--ytaie-line);
	margin-bottom: 18px;
}

.youtube-ai-expert .ytaie-brand {
	display: flex;
	align-items: center;
	gap: 12px;
	min-width: 0;
}

.youtube-ai-expert .ytaie-brand__mark {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 42px;
	height: 42px;
	flex: 0 0 42px;
	border-radius: 12px;
	background: rgba(225, 29, 72, 0.1);
	color: var(--ytaie-red);
}

.youtube-ai-expert .ytaie-title {
	margin: 0;
	font-size: 20px;
	font-weight: 700;
	line-height: 1.25;
	color: var(--ytaie-ink);
	letter-spacing: -0.01em;
}

.youtube-ai-expert .ytaie-subtitle {
	margin: 2px 0 0;
	font-size: 14px;
	color: var(--ytaie-muted);
}

/* Chat area */

.youtube-ai-expert .ytaie-chat {
	display: flex;
	flex-direction: column;
	gap: 18px;
	max-height: 460px;
	min-height: 220px;
	overflow-y: auto;
	padding: 4px 4px 8px;
	scroll-behavior: smooth;
}

.youtube-ai-expert .ytaie-msg {
	display: flex;
	flex-direction: column;
	gap: 6px;
	max-width: 86%;
}

.youtube-ai-expert .ytaie-msg--user {
	align-self: flex-end;
	align-items: flex-end;
}

.youtube-ai-expert .ytaie-msg--ai {
	align-self: flex-start;
}

.youtube-ai-expert .ytaie-msg__role {
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--ytaie-muted);
}

.youtube-ai-expert .ytaie-bubble {
	background: var(--ytaie-surface-soft);
	border: 1px solid var(--ytaie-line);
	border-radius: 14px;
	padding: 12px 16px;
	word-wrap: break-word;
	overflow-wrap: anywhere;
}

.youtube-ai-expert .ytaie-msg--user .ytaie-bubble {
	background: var(--ytaie-blue);
	border-color: var(--ytaie-blue);
	color: #ffffff;
	border-bottom-right-radius: 4px;
}

.youtube-ai-expert .ytaie-msg--ai .ytaie-bubble {
	border-bottom-left-radius: 4px;
}

.youtube-ai-expert .ytaie-bubble p {
	margin: 0 0 10px;
}

.youtube-ai-expert .ytaie-bubble p:last-child,
.youtube-ai-expert .ytaie-bubble ul:last-child,
.youtube-ai-expert .ytaie-bubble ol:last-child,
.youtube-ai-expert .ytaie-bubble pre:last-child {
	margin-bottom: 0;
}

.youtube-ai-expert .ytaie-bubble h3,
.youtube-ai-expert .ytaie-bubble h4 {
	margin: 14px 0 6px;
	font-size: 16px;
	font-weight: 700;
	line-height: 1.35;
	color: var(--ytaie-ink);
}

.youtube-ai-expert .ytaie-bubble h3:first-child,
.youtube-ai-expert .ytaie-bubble h4:first-child {
	margin-top: 0;
}

.youtube-ai-expert .ytaie-bubble ul,
.youtube-ai-expert .ytaie-bubble ol {
	margin: 0 0 10px;
	padding-left: 22px;
}

.youtube-ai-expert .ytaie-bubble li {
	margin: 0 0 4px;
}

.youtube-ai-expert .ytaie-bubble code {
	background: rgba(15, 23, 42, 0.06);
	border-radius: 5px;
	padding: 1px 5px;
	font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
	font-size: 0.9em;
}

.youtube-ai-expert .ytaie-bubble pre {
	background: #0f172a;
	color: #e2e8f0;
	border-radius: 10px;
	padding: 12px 14px;
	overflow-x: auto;
	margin: 0 0 10px;
}

.youtube-ai-expert .ytaie-bubble pre code {
	background: transparent;
	color: inherit;
	padding: 0;
}

.youtube-ai-expert .ytaie-msg--user .ytaie-bubble code {
	background: rgba(255, 255, 255, 0.18);
}

/* Typing indicator */

.youtube-ai-expert .ytaie-typing {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	color: var(--ytaie-muted);
	font-size: 14px;
}

.youtube-ai-expert .ytaie-typing__dots {
	display: inline-flex;
	gap: 4px;
}

.youtube-ai-expert .ytaie-typing__dots span {
	width: 6px;
	height: 6px;
	border-radius: 50%;
	background: var(--ytaie-blue);
	opacity: 0.35;
	animation: ytaie-blink 1.2s infinite ease-in-out;
}

.youtube-ai-expert .ytaie-typing__dots span:nth-child(2) {
	animation-delay: 0.18s;
}

.youtube-ai-expert .ytaie-typing__dots span:nth-child(3) {
	animation-delay: 0.36s;
}

@keyframes ytaie-blink {
	0%, 80%, 100% { opacity: 0.25; transform: translateY(0); }
	40% { opacity: 1; transform: translateY(-2px); }
}

/* Alerts */

.youtube-ai-expert .ytaie-alert {
	margin: 14px 0 0;
	padding: 10px 14px;
	border-radius: 10px;
	border: 1px solid #fecdd3;
	background: #fff1f2;
	color: #9f1239;
	font-size: 14px;
}

/* Form */

.youtube-ai-expert .ytaie-form {
	margin-top: 18px;
	border: 1px solid var(--ytaie-line);
	border-radius: 14px;
	padding: 12px;
	background: var(--ytaie-surface-soft);
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.youtube-ai-expert .ytaie-form:focus-within {
	border-color: var(--ytaie-blue);
	box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.youtube-ai-expert .ytaie-textarea {
	display: block;
	width: 100%;
	min-height: 62px;
	max-height: 220px;
	resize: vertical;
	border: 0;
	background: transparent;
	color: var(--ytaie-ink);
	font-family: inherit;
	font-size: 16px;
	line-height: 1.5;
	padding: 6px 6px 10px;
	outline: none;
	box-shadow: none;
}

.youtube-ai-expert .ytaie-textarea::placeholder {
	color: #94a3b8;
}

.youtube-ai-expert .ytaie-form__footer {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	flex-wrap: wrap;
}

.youtube-ai-expert .ytaie-hint {
	font-size: 13px;
	color: var(--ytaie-muted);
}

/* Buttons */

.youtube-ai-expert .ytaie-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	border-radius: 10px;
	border: 1px solid transparent;
	cursor: pointer;
	font-family: inherit;
	font-size: 15px;
	font-weight: 600;
	line-height: 1.2;
	padding: 11px 20px;
	text-decoration: none;
	transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.youtube-ai-expert .ytaie-btn:focus-visible {
	outline: 2px solid var(--ytaie-blue);
	outline-offset: 2px;
}

.youtube-ai-expert .ytaie-btn--primary {
	background: var(--ytaie-blue);
	color: #ffffff;
}

.youtube-ai-expert .ytaie-btn--primary:hover {
	background: var(--ytaie-blue-dark);
}

.youtube-ai-expert .ytaie-btn--primary:active {
	transform: translateY(1px);
}

.youtube-ai-expert .ytaie-btn--ghost {
	background: transparent;
	border-color: var(--ytaie-line);
	color: var(--ytaie-muted);
	font-size: 14px;
	padding: 8px 14px;
	flex: 0 0 auto;
}

.youtube-ai-expert .ytaie-btn--ghost:hover {
	color: var(--ytaie-ink);
	border-color: #cbd5e1;
	background: var(--ytaie-surface-soft);
}

.youtube-ai-expert .ytaie-btn[disabled] {
	opacity: 0.6;
	cursor: not-allowed;
	transform: none;
}

.youtube-ai-expert .ytaie-spinner {
	display: none;
	width: 15px;
	height: 15px;
	border-radius: 50%;
	border: 2px solid rgba(255, 255, 255, 0.4);
	border-top-color: #ffffff;
	animation: ytaie-spin 0.7s linear infinite;
}

.youtube-ai-expert .ytaie-btn.is-loading .ytaie-spinner {
	display: inline-block;
}

@keyframes ytaie-spin {
	to { transform: rotate(360deg); }
}

.youtube-ai-expert .ytaie-disclaimer {
	margin: 14px 0 0;
	font-size: 12.5px;
	color: var(--ytaie-muted);
}

.youtube-ai-expert .ytaie-visually-hidden {
	position: absolute !important;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip: rect(0 0 0 0);
	white-space: nowrap;
	border: 0;
}

/* Responsive */

@media (max-width: 640px) {
	.youtube-ai-expert .ytaie-card {
		padding: 18px 16px;
		border-radius: 14px;
	}

	.youtube-ai-expert .ytaie-header {
		flex-direction: column;
		align-items: stretch;
		gap: 12px;
	}

	.youtube-ai-expert .ytaie-btn--ghost {
		align-self: flex-start;
	}

	.youtube-ai-expert .ytaie-msg {
		max-width: 100%;
	}

	.youtube-ai-expert .ytaie-chat {
		max-height: 60vh;
	}

	.youtube-ai-expert .ytaie-form__footer {
		flex-direction: column-reverse;
		align-items: stretch;
	}

	.youtube-ai-expert .ytaie-btn--primary {
		width: 100%;
	}

	.youtube-ai-expert .ytaie-hint {
		text-align: center;
	}
}

@media (prefers-reduced-motion: reduce) {
	.youtube-ai-expert .ytaie-chat {
		scroll-behavior: auto;
	}

	.youtube-ai-expert .ytaie-spinner,
	.youtube-ai-expert .ytaie-typing__dots span {
		animation: none;
	}
}