/* LernQ AI ChatGPT-Style Layout */

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    background: var(--color-background-primary);
}

/* Left Sidebar (ChatGPT Style) */
.sidebar-left {
    width: 260px;
    background: var(--color-background-secondary);
    border-right: 1px solid var(--color-separator);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--color-separator);
}

.new-chat-btn {
    width: 100%;
    background: var(--color-background-primary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-separator);
    border-radius: 8px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
}

.new-chat-btn:hover {
    background: var(--color-fill-secondary);
    border-color: var(--color-primary);
}

.new-chat-btn svg {
    width: 16px;
    height: 16px;
}

.sidebar-content {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-section h3 {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 12px 0;
}

.sidebar-item {
    width: 100%;
    background: none;
    color: var(--color-text-primary);
    border: none;
    border-radius: 8px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    text-align: left;
    margin-bottom: 4px;
}

.sidebar-item:hover {
    background: var(--color-fill-secondary);
}

.sidebar-item svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Chat History Items */
.chat-history-item {
    background: var(--color-background-primary);
    border: 1px solid var(--color-separator);
    border-radius: 8px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 8px;
}

.chat-history-item:hover {
    background: var(--color-fill-secondary);
    border-color: var(--color-primary);
}

.chat-history-item.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.chat-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.chat-preview {
    font-size: 12px;
    opacity: 0.8;
    line-height: 1.3;
}

/* Guide Items */
.guide-item {
    background: var(--color-background-primary);
    border: 1px solid var(--color-separator);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
}

.guide-item h4 {
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 8px 0;
    color: var(--color-text-primary);
}

.guide-item p {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.4;
}

.guide-item code {
    background: var(--color-fill-secondary);
    color: var(--color-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-family: 'Monaco', 'Menlo', monospace;
}

/* Main Content Area */
.main-area {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Top Header */
.top-header {
    height: 60px;
    background: var(--color-background-primary);
    border-bottom: 1px solid var(--color-separator);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 32px;
}

.mobile-menu-toggle {
    background: var(--color-fill-secondary);
    border: 1px solid var(--color-separator);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
    width: 36px;
    height: 36px;
    position: absolute;
    left: 20px;
}

.mobile-menu-toggle:hover {
    background: var(--color-fill-primary);
    border-color: var(--color-primary);
}

.mobile-menu-toggle svg {
    width: 16px;
    height: 16px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
}

.settings-btn {
    background: var(--color-fill-secondary);
    border: 1px solid var(--color-separator);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
    width: 36px;
    height: 36px;
}

.settings-btn:hover {
    background: var(--color-fill-primary);
    border-color: var(--color-primary);
}

.settings-btn svg {
    width: 16px;
    height: 16px;
}

.theme-toggle {
    background: var(--color-fill-secondary);
    border: 1px solid var(--color-separator);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--color-text-primary);
}

.theme-toggle:hover {
    background: var(--color-fill-primary);
    border-color: var(--color-primary);
}

.theme-toggle .theme-icon {
    font-size: 16px;
    transition: transform 0.3s ease;
}

.theme-toggle.dark .theme-icon {
    transform: rotate(180deg);
}

/* Chat Content */
.chat-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Welcome Section */
.welcome-section {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
}

.welcome-content {
    max-width: 600px;
    width: 100%;
}

.welcome-header h1 {
    font-size: 32px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    scroll-behavior: smooth;
}

.chat-messages {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Message Styles */
.message {
    display: flex;
    gap: 12px;
    max-width: 100%;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
}

.message.ai .message-avatar {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.message.user .message-avatar {
    background: var(--color-fill-secondary);
    color: var(--color-text-primary);
    border: 2px solid var(--color-separator);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message.user .message-content {
    display: flex;
    justify-content: flex-end;
}

.message-bubble {
    background: var(--color-background-secondary);
    border: 1px solid var(--color-separator);
    border-radius: 16px;
    padding: 12px 16px;
    max-width: 70%;
    word-wrap: break-word;
}

.message.user .message-bubble {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.message-text {
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
}

.message-time {
    font-size: 11px;
    color: var(--color-text-tertiary);
    margin-top: 4px;
    text-align: right;
}

.message.ai .message-time {
    text-align: left;
}

/* Loading Animation */
.message-loading {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 0;
}

.loading-dot {
    width: 6px;
    height: 6px;
    background: var(--color-text-secondary);
    border-radius: 50%;
    animation: loading-pulse 1.4s infinite ease-in-out;
}

.loading-dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes loading-pulse {
    0%, 80%, 100% { opacity: 0.3; }
    40% { opacity: 1; }
}

/* Chat Input Section */
.chat-input-section {
    background: var(--color-background-primary);
    border-top: 1px solid var(--color-separator);
    padding: 20px;
    position: sticky;
    bottom: 0;
    z-index: 100;
}

.chat-input-container {
    max-width: 800px;
    margin: 0 auto;
}

.chat-input-wrapper {
    background: var(--color-background-secondary);
    border: 1px solid var(--color-separator);
    border-radius: 12px;
    padding: 12px;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    transition: border-color 0.2s ease;
}

.chat-input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.chat-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    font-size: 14px;
    color: var(--color-text-primary);
    resize: none;
    min-height: 20px;
    max-height: 120px;
    line-height: 1.5;
    font-family: var(--font-system);
}

.chat-input::placeholder {
    color: var(--color-text-tertiary);
}

.send-button {
    background: var(--color-primary);
    border: none;
    border-radius: 8px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.send-button:hover {
    background: var(--color-primary-hover);
    transform: scale(1.05);
}

.send-button:disabled {
    background: var(--color-text-tertiary);
    cursor: not-allowed;
    transform: none;
}

.send-button svg {
    width: 16px;
    height: 16px;
}

.chat-input-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 8px;
    font-size: 11px;
    color: var(--color-text-tertiary);
}

.disclaimer {
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar-left {
        width: 100%;
        left: -100%;
        transition: left 0.3s ease;
    }
    
    .sidebar-left.active {
        left: 0;
    }
    
    .main-area {
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .top-header {
        justify-content: flex-end;
        padding: 0 20px;
        position: relative;
    }
    
    .header-actions {
        gap: 12px;
    }
    
    .header-actions .settings-btn,
    .header-actions .theme-toggle {
        padding: 6px 8px;
        font-size: 11px;
    }
    
    .header-actions .settings-btn {
        width: 32px;
        height: 32px;
    }
    
    .welcome-header h1 {
        font-size: 24px;
    }
}

/* Dark Mode Overrides */
body.dark-mode {
    --color-background-primary: #000000;
    --color-background-secondary: #1C1C1E;
    --color-background-tertiary: #2C2C2E;
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #8E8E93;
    --color-text-tertiary: #48484A;
    --color-separator: #38383A;
    --color-fill-primary: #3A3A3C;
    --color-fill-secondary: #48484A;
    --color-success: #30D158;
}

body.dark-mode .theme-toggle .theme-icon {
    content: '🌙';
}

/* Animation for smooth transitions */
.chat-messages {
    animation: fadeIn 0.3s ease;
}

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

/* Scroll styling */
.chat-container::-webkit-scrollbar,
.sidebar-left::-webkit-scrollbar {
    width: 6px;
}

.chat-container::-webkit-scrollbar-track,
.sidebar-left::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb,
.sidebar-left::-webkit-scrollbar-thumb {
    background: var(--color-separator);
    border-radius: 3px;
}

.chat-container::-webkit-scrollbar-thumb:hover,
.sidebar-left::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}