/**
 * AITutor Widget Styles
 * Matches AITutorials.site theme (blue/teal gradient)
 * Mobile-responsive and dark mode compatible
 */

/* Widget Container */
#aitutor-widget {
    position: fixed;
    z-index: 9999;
}

/* Backdrop Overlay (mobile only) */
.aitutor-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 9997;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.aitutor-backdrop.aitutor-visible {
    opacity: 1;
    pointer-events: auto;
}

/* Hide backdrop on desktop */
@media (min-width: 769px) {
    .aitutor-backdrop {
        display: none;
    }
}

/* Floating Action Button */
.aitutor-fab {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: auto;
    height: 56px;
    padding: 0 1.5rem;
    background: linear-gradient(135deg, #3b82f6 0%, #14b8a6 100%);
    border: none;
    border-radius: 28px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
}

.aitutor-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.aitutor-fab svg {
    width: 24px;
    height: 24px;
}

.aitutor-fab.aitutor-hidden {
    display: none;
}

/* Chat Panel */
.aitutor-panel {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 400px;
    max-width: calc(100vw - 4rem);
    height: 600px;
    max-height: calc(100vh - 4rem);
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.3s ease;
    /* Ensure proper stacking */
    z-index: 9998;
    /* Better mobile performance */
    -webkit-overflow-scrolling: touch;
}

.aitutor-panel.aitutor-hidden {
    display: none;
}

/* Accessibility: Focus trap and keyboard navigation */
.aitutor-panel:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    .aitutor-panel {
        background: #1e293b;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    }
}

body.dark-mode .aitutor-panel {
    background: #1e293b;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* Header */
.aitutor-header {
    background: linear-gradient(135deg, #3b82f6 0%, #14b8a6 100%);
    color: white;
    padding: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.aitutor-header-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.aitutor-avatar {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.aitutor-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
}

.aitutor-status {
    margin: 0.25rem 0 0;
    font-size: 0.875rem;
    opacity: 0.9;
}

.aitutor-close-btn {
    background: transparent;
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    padding: 0;
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.aitutor-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Messages Container */
.aitutor-messages {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: #f8fafc;
}

@media (prefers-color-scheme: dark) {
    .aitutor-messages {
        background: #0f172a;
    }
}

body.dark-mode .aitutor-messages {
    background: #0f172a;
}

/* Individual Message */
.aitutor-message {
    display: flex;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.aitutor-message-content {
    max-width: 85%;
    padding: 0.875rem 1rem;
    border-radius: 12px;
    word-wrap: break-word;
}

/* Bot Message */
.aitutor-message.aitutor-bot .aitutor-message-content {
    background: white;
    color: #334155;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    margin-right: auto;
}

@media (prefers-color-scheme: dark) {
    .aitutor-message.aitutor-bot .aitutor-message-content {
        background: #1e293b;
        color: #e2e8f0;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }
}

body.dark-mode .aitutor-message.aitutor-bot .aitutor-message-content {
    background: #1e293b;
    color: #e2e8f0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* User Message */
.aitutor-message.aitutor-user .aitutor-message-content {
    background: linear-gradient(135deg, #3b82f6 0%, #14b8a6 100%);
    color: white;
    margin-left: auto;
}

/* Message Text Formatting */
.aitutor-message-content p {
    margin: 0 0 0.5rem;
    line-height: 1.6;
}

.aitutor-message-content p:last-child {
    margin-bottom: 0;
}

.aitutor-message-content strong {
    font-weight: 600;
}

.aitutor-message-content code {
    background: rgba(0, 0, 0, 0.08);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.875em;
}

.aitutor-message.aitutor-user .aitutor-message-content code {
    background: rgba(255, 255, 255, 0.2);
}

/* Loading State */
.aitutor-message-content.aitutor-loading {
    background: #e2e8f0;
    color: #64748b;
    font-style: italic;
}

@media (prefers-color-scheme: dark) {
    .aitutor-message-content.aitutor-loading {
        background: #334155;
        color: #94a3b8;
    }
}

body.dark-mode .aitutor-message-content.aitutor-loading {
    background: #334155;
    color: #94a3b8;
}

.aitutor-loading-dots {
    display: inline-block;
    margin-right: 0.25rem;
}

.aitutor-loading-dots span {
    animation: blink 1.4s infinite;
}

.aitutor-loading-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.aitutor-loading-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes blink {
    0%, 60%, 100% {
        opacity: 0.3;
    }
    30% {
        opacity: 1;
    }
}

/* Error State */
.aitutor-message-content.aitutor-error {
    background: #fee;
    color: #b91c1c;
    border-left: 3px solid #dc2626;
}

@media (prefers-color-scheme: dark) {
    .aitutor-message-content.aitutor-error {
        background: #7f1d1d;
        color: #fca5a5;
    }
}

body.dark-mode .aitutor-message-content.aitutor-error {
    background: #7f1d1d;
    color: #fca5a5;
}

/* Input Container */
.aitutor-input-container {
    padding: 1rem;
    background: white;
    border-top: 1px solid #e2e8f0;
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

@media (prefers-color-scheme: dark) {
    .aitutor-input-container {
        background: #1e293b;
        border-top-color: #334155;
    }
}

body.dark-mode .aitutor-input-container {
    background: #1e293b;
    border-top-color: #334155;
}

.aitutor-input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 0.9375rem;
    font-family: inherit;
    resize: none;
    transition: border-color 0.2s;
}

.aitutor-input:focus {
    outline: none;
    border-color: #3b82f6;
}

@media (prefers-color-scheme: dark) {
    .aitutor-input {
        background: #0f172a;
        color: #e2e8f0;
        border-color: #334155;
    }
    
    .aitutor-input:focus {
        border-color: #14b8a6;
    }
}

body.dark-mode .aitutor-input {
    background: #0f172a;
    color: #e2e8f0;
    border-color: #334155;
}

body.dark-mode .aitutor-input:focus {
    border-color: #14b8a6;
}

.aitutor-send-btn {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #3b82f6 0%, #14b8a6 100%);
    border: none;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
    flex-shrink: 0;
}

.aitutor-send-btn:hover {
    transform: scale(1.05);
}

.aitutor-send-btn:active {
    transform: scale(0.95);
}

/* Warning Message */
.aitutor-warning {
    background: #fef3c7;
    color: #92400e;
    padding: 0.75rem;
    border-radius: 8px;
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    .aitutor-warning {
        background: #78350f;
        color: #fde68a;
    }
}

body.dark-mode .aitutor-warning {
    background: #78350f;
    color: #fde68a;
}

.aitutor-warning.aitutor-hidden {
    display: none;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .aitutor-fab {
        bottom: 1rem;
        right: 1rem;
        font-size: 0;
        width: 56px;
        height: 56px;
        padding: 0;
        justify-content: center;
    }
    
    .aitutor-fab span {
        display: none;
    }
    
    .aitutor-panel {
        bottom: 0;
        right: 0;
        left: 0;
        width: 100%;
        max-width: 100%;
        height: 70vh;
        max-height: 70vh;
        border-radius: 16px 16px 0 0;
    }
    
    .aitutor-messages {
        padding: 1rem;
    }
    
    .aitutor-input-container {
        padding: 0.875rem;
    }
}

/* Small Mobile Devices (smaller than iPhone SE) */
@media (max-width: 375px) {
    .aitutor-fab {
        bottom: 0.75rem;
        right: 0.75rem;
        width: 52px;
        height: 52px;
    }
    
    .aitutor-panel {
        height: 75vh;
        max-height: 75vh;
    }
    
    .aitutor-header {
        padding: 1rem;
    }
    
    .aitutor-header h3 {
        font-size: 1rem;
    }
    
    .aitutor-status {
        font-size: 0.8125rem;
    }
    
    .aitutor-messages {
        padding: 0.875rem;
        gap: 0.75rem;
    }
    
    .aitutor-input-container {
        padding: 0.75rem;
        gap: 0.5rem;
    }
    
    .aitutor-input {
        font-size: 0.875rem;
        padding: 0.625rem;
    }
    
    .aitutor-send-btn {
        width: 40px;
        height: 40px;
    }
}

/* Tablet Landscape Mode */
@media (min-width: 769px) and (max-width: 1024px) {
    .aitutor-panel {
        width: 380px;
        height: 550px;
    }
}

/* Scrollbar Styling */
.aitutor-messages::-webkit-scrollbar {
    width: 6px;
}

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

.aitutor-messages::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

.aitutor-messages::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

@media (prefers-color-scheme: dark) {
    .aitutor-messages::-webkit-scrollbar-thumb {
        background: #475569;
    }
    
    .aitutor-messages::-webkit-scrollbar-thumb:hover {
        background: #64748b;
    }
}

body.dark-mode .aitutor-messages::-webkit-scrollbar-thumb {
    background: #475569;
}

body.dark-mode .aitutor-messages::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}