/**
 * SNBose AI Physics Tutor - Chat Widget Styles
 *
 * Designed to look professional and non-intrusive on
 * the Radcliffe 2 theme. Uses CSS custom properties for
 * easy colour customisation.
 *
 * @since 1.0.0
 */

/* ===================================================
   CSS CUSTOM PROPERTIES
   =================================================== */

:root {
	--snbose-primary:       #1a237e;
	--snbose-primary-light: #3949ab;
	--snbose-accent:        #e65100;
	--snbose-accent-light:  #ff6d00;
	--snbose-bg:            #ffffff;
	--snbose-bg-ai:         #f0f4ff;
	--snbose-bg-user:       #1a237e;
	--snbose-text:          #212121;
	--snbose-text-light:    #546e7a;
	--snbose-border:        #c5cae9;
	--snbose-shadow:        0 8px 32px rgba(26, 35, 126, 0.18);
	--snbose-radius:        14px;
	--snbose-radius-sm:     8px;
	--snbose-font:          -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
	--snbose-popup-w:       480px;
	--snbose-popup-h:       580px;
}

/* ===================================================
   AI TUTOR BUTTON (injected next to each question)
   =================================================== */

.snbose-ai-btn-wrap {
	margin: 12px 0 20px;
	display: flex;
	align-items: center;
}

.snbose-ai-btn {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 9px 20px;
	background: linear-gradient( 135deg, var( --snbose-primary ), var( --snbose-primary-light ) );
	color: #ffffff !important;
	border: none;
	border-radius: 50px;
	font-family: var( --snbose-font );
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
	box-shadow: 0 3px 10px rgba(26, 35, 126, 0.30);
	text-decoration: none;
	letter-spacing: 0.3px;
}

.snbose-ai-btn:hover {
	transform: translateY( -2px );
	box-shadow: 0 6px 18px rgba(26, 35, 126, 0.38);
	opacity: 0.93;
}

.snbose-ai-btn:active {
	transform: translateY( 0 );
}

/* ===================================================
   CHAT POPUP
   =================================================== */

.snbose-chat-popup {
	position: fixed;
	bottom: 24px;
	right: 24px;
	width: var( --snbose-popup-w );
	max-width: calc( 100vw - 48px );
	height: var( --snbose-popup-h );
	max-height: calc( 100vh - 48px );
	background: var( --snbose-bg );
	border-radius: var( --snbose-radius );
	box-shadow: var( --snbose-shadow );
	display: flex;
	flex-direction: column;
	z-index: 999999;
	font-family: var( --snbose-font );
	border: 1px solid var( --snbose-border );
	overflow: hidden;
	transition: opacity 0.25s ease, transform 0.25s ease;
}

.snbose-hidden {
	opacity: 0;
	pointer-events: none;
	transform: translateY( 16px ) scale( 0.97 );
}

.snbose-visible {
	opacity: 1;
	pointer-events: all;
	transform: translateY( 0 ) scale( 1 );
}

/* ===================================================
   HEADER
   =================================================== */

.snbose-chat-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 14px 16px;
	background: linear-gradient( 135deg, var( --snbose-primary ), var( --snbose-primary-light ) );
	color: #ffffff;
	flex-shrink: 0;
}

.snbose-chat-header-info {
	display: flex;
	align-items: center;
	gap: 10px;
	min-width: 0;
}

.snbose-chat-logo {
	font-size: 24px;
	line-height: 1;
	flex-shrink: 0;
}

.snbose-chat-title {
	font-size: 15px;
	font-weight: 700;
	color: #ffffff;
	line-height: 1.2;
}

.snbose-chat-subtitle {
	font-size: 11px;
	color: rgba(255, 255, 255, 0.75);
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
	max-width: 320px;
	line-height: 1.3;
}

.snbose-close-btn {
	background: rgba(255, 255, 255, 0.15);
	border: none;
	color: #ffffff;
	width: 30px;
	height: 30px;
	border-radius: 50%;
	cursor: pointer;
	font-size: 16px;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-shrink: 0;
	transition: background 0.15s ease;
	line-height: 1;
}

.snbose-close-btn:hover {
	background: rgba(255, 255, 255, 0.28);
}

/* ===================================================
   MESSAGES AREA
   =================================================== */

.snbose-chat-messages {
	flex: 1;
	overflow-y: auto;
	padding: 16px;
	display: flex;
	flex-direction: column;
	gap: 12px;
	scroll-behavior: smooth;
}

.snbose-chat-messages::-webkit-scrollbar {
	width: 4px;
}

.snbose-chat-messages::-webkit-scrollbar-track {
	background: transparent;
}

.snbose-chat-messages::-webkit-scrollbar-thumb {
	background: var( --snbose-border );
	border-radius: 4px;
}

/* ===================================================
   MESSAGE BUBBLES
   =================================================== */

.snbose-msg {
	max-width: 88%;
	padding: 11px 14px;
	border-radius: var( --snbose-radius-sm );
	font-size: 14px;
	line-height: 1.6;
	color: var( --snbose-text );
	word-wrap: break-word;
}

.snbose-msg-ai {
	background: var( --snbose-bg-ai );
	border: 1px solid var( --snbose-border );
	align-self: flex-start;
	border-bottom-left-radius: 3px;
}

.snbose-msg-user {
	background: var( --snbose-bg-user );
	color: #ffffff;
	align-self: flex-end;
	border-bottom-right-radius: 3px;
}

.snbose-msg-error {
	background: #fff3e0;
	border: 1px solid #ffb74d;
	align-self: flex-start;
	width: 100%;
	max-width: 100%;
}

.snbose-error-text {
	color: #e65100;
	font-size: 13px;
}

/* Math/LaTeX display inside AI messages */
.snbose-msg-ai .MathJax,
.snbose-msg-ai .MathJax_Display {
	font-size: 1em !important;
}

/* ===================================================
   TYPING INDICATOR
   =================================================== */

.snbose-msg-typing {
	display: flex;
	align-items: center;
	gap: 10px;
	background: var( --snbose-bg-ai );
	border: 1px solid var( --snbose-border );
	align-self: flex-start;
	border-bottom-left-radius: 3px;
	padding: 11px 14px;
}

.snbose-typing-dots {
	display: flex;
	gap: 4px;
	align-items: center;
}

.snbose-typing-dots span {
	width: 7px;
	height: 7px;
	background: var( --snbose-primary-light );
	border-radius: 50%;
	animation: snbose-bounce 1.2s infinite ease-in-out;
}

.snbose-typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.snbose-typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes snbose-bounce {
	0%, 80%, 100% { transform: scale( 0.75 ); opacity: 0.5; }
	40%           { transform: scale( 1 );    opacity: 1;   }
}

.snbose-typing-text {
	font-size: 13px;
	color: var( --snbose-text-light );
	font-style: italic;
}

/* ===================================================
   QUICK ACTION BUTTONS
   =================================================== */

.snbose-quick-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 6px;
	padding: 10px 16px;
	border-top: 1px solid var( --snbose-border );
	background: #fafafa;
	flex-shrink: 0;
}

.snbose-action-btn {
	padding: 6px 12px;
	border: 1.5px solid var( --snbose-border );
	background: #ffffff;
	color: var( --snbose-primary );
	border-radius: 50px;
	font-size: 12px;
	font-weight: 600;
	cursor: pointer;
	transition: all 0.15s ease;
	font-family: var( --snbose-font );
	white-space: nowrap;
}

.snbose-action-btn:hover {
	background: var( --snbose-primary );
	color: #ffffff;
	border-color: var( --snbose-primary );
}

.snbose-action-primary {
	background: var( --snbose-accent );
	color: #ffffff;
	border-color: var( --snbose-accent );
}

.snbose-action-primary:hover {
	background: var( --snbose-accent-light );
	border-color: var( --snbose-accent-light );
}

/* ===================================================
   INPUT AREA
   =================================================== */

.snbose-chat-input-area {
	display: flex;
	gap: 8px;
	padding: 10px 16px;
	border-top: 1px solid var( --snbose-border );
	background: #ffffff;
	flex-shrink: 0;
	align-items: flex-end;
}

.snbose-chat-input {
	flex: 1;
	border: 1.5px solid var( --snbose-border );
	border-radius: var( --snbose-radius-sm );
	padding: 9px 12px;
	font-size: 14px;
	font-family: var( --snbose-font );
	resize: none;
	outline: none;
	color: var( --snbose-text );
	transition: border-color 0.15s ease;
	line-height: 1.5;
}

.snbose-chat-input:focus {
	border-color: var( --snbose-primary-light );
}

.snbose-send-btn {
	padding: 9px 16px;
	background: var( --snbose-primary );
	color: #ffffff;
	border: none;
	border-radius: var( --snbose-radius-sm );
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	transition: background 0.15s ease;
	font-family: var( --snbose-font );
	white-space: nowrap;
	align-self: flex-end;
}

.snbose-send-btn:hover {
	background: var( --snbose-primary-light );
}

/* ===================================================
   FOOTER
   =================================================== */

.snbose-chat-footer {
	text-align: center;
	font-size: 10px;
	color: var( --snbose-text-light );
	padding: 5px 16px 8px;
	background: #fafafa;
	border-top: 1px solid #eeeeee;
	flex-shrink: 0;
}

/* ===================================================
   RESPONSIVE — mobile
   =================================================== */

@media ( max-width: 540px ) {
	.snbose-chat-popup {
		bottom: 0;
		right: 0;
		left: 0;
		width: 100%;
		max-width: 100%;
		border-radius: var( --snbose-radius ) var( --snbose-radius ) 0 0;
		height: 85vh;
		max-height: 85vh;
	}

	.snbose-quick-actions {
		gap: 5px;
		padding: 8px 12px;
	}

	.snbose-action-btn {
		font-size: 11px;
		padding: 5px 10px;
	}

	.snbose-chat-subtitle {
		max-width: 200px;
	}
}