/* UA2-125 AI Assistant Styles - ChatGPT-style Layout */

:root {
    --primary-color: #1a1a2e;
    --secondary-color: #16213e;
    --accent-color: #0f3460;
    --highlight-color: #e94560;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --background: #0f0f1e;
    --message-user-bg: #1a4d7a;
    --message-assistant-bg: #1e1e2e;
    --border-color: #2a2a3e;
    --success-color: #4caf50;
    --error-color: #e94560;
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 0px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* =============================================================================
   APP CONTAINER - Main Layout
   ============================================================================= */
.app-container {
    display: flex;
    height: 100vh;
    width: 100%;
}

/* =============================================================================
   SIDEBAR
   ============================================================================= */
.sidebar {
    width: var(--sidebar-width);
    background: var(--secondary-color);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    transition: width 0.3s ease, transform 0.3s ease;
    flex-shrink: 0;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
    overflow: hidden;
}

.sidebar-header {
    padding: 1rem;
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.new-chat-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.sidebar-toggle {
    padding: 0.75rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.sidebar-toggle:hover {
    background: var(--accent-color);
    color: var(--text-primary);
}

/* Search */
.search-container {
    padding: 0.75rem 1rem;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 1.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 0.6rem 2.5rem 0.6rem 2.5rem;
    background: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.search-input:focus {
    border-color: var(--accent-color);
}

.search-clear {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-clear:hover {
    color: var(--text-primary);
}

/* Search Results */
.search-results {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.search-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.close-search {
    background: none;
    border: none;
    color: var(--highlight-color);
    cursor: pointer;
    font-size: 0.8rem;
}

.close-search:hover {
    text-decoration: underline;
}

.search-results-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.search-result-item {
    padding: 0.75rem;
    background: var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.search-result-item:hover {
    background: var(--accent-color);
}

.search-result-title {
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.search-result-content {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-result-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Conversation List */
.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.conversations-list::-webkit-scrollbar {
    width: 6px;
}

.conversations-list::-webkit-scrollbar-track {
    background: transparent;
}

.conversations-list::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 3px;
}

.section-label {
    padding: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    position: relative;
}

.conversation-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.conversation-item.active {
    background: var(--accent-color);
}

.conversation-icon {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.conversation-info {
    flex: 1;
    min-width: 0;
}

.conversation-title {
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-preview {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-actions {
    display: none;
    gap: 0.25rem;
}

.conversation-item:hover .conversation-actions {
    display: flex;
}

.action-btn {
    padding: 0.35rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.action-btn.delete-btn:hover {
    color: var(--error-color);
}

/* Empty State */
.empty-state {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: 0.5rem;
}

.empty-hint {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 600;
}

.user-name {
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* =============================================================================
   MAIN CONTENT
   ============================================================================= */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--primary-color);
}

/* Header */
.chat-header {
    background: var(--secondary-color);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-shrink: 0;
}

.mobile-menu-btn {
    display: none;
    padding: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

.header-content {
    flex: 1;
}

.header-content h1 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.125rem;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    font-size: 0.8rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: pulse 2s infinite;
}

.status-dot.ready {
    background: var(--success-color);
}

.status-dot.processing {
    background: #ff9800;
}

.status-dot.error {
    background: var(--error-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.rename-btn {
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.rename-btn:hover {
    background: var(--accent-color);
    color: var(--text-primary);
    border-color: var(--accent-color);
}

/* =============================================================================
   MESSAGES CONTAINER
   ============================================================================= */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.messages-container::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track {
    background: var(--primary-color);
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

.messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--highlight-color);
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.welcome-logo {
    margin-bottom: 1.5rem;
    color: var(--highlight-color);
}

.welcome-screen h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.welcome-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.quick-prompts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 600px;
}

.quick-prompt {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.quick-prompt:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.quick-prompt svg {
    color: var(--highlight-color);
    flex-shrink: 0;
}

/* Messages Area */
#messagesArea {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
}

/* Messages */
.message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    animation: slideIn 0.3s ease-out;
}

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

.user-message {
    align-self: flex-end;
}

.assistant-message {
    align-self: flex-start;
}

.message-content {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    line-height: 1.6;
}

.user-message .message-content {
    background: var(--message-user-bg);
    border-bottom-right-radius: 4px;
}

.assistant-message .message-content {
    background: var(--message-assistant-bg);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.message-content p {
    margin-bottom: 0.75rem;
}

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

.message-content h1,
.message-content h2,
.message-content h3 {
    margin: 1rem 0 0.75rem 0;
    color: var(--text-primary);
    font-weight: 600;
}

.message-content h1 {
    font-size: 1.5em;
}

.message-content h2 {
    font-size: 1.3em;
}

.message-content h3 {
    font-size: 1.1em;
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child {
    margin-top: 0;
}

.message-content ul,
.message-content ol {
    margin: 0.5rem 0 0.5rem 1.5rem;
}

.message-content ol {
    padding-left: 0.5rem;
}

.message-content li {
    margin-bottom: 0.5rem;
}

.message-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.message-content code {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

/* Typing Indicator */
.typing-indicator .message-content {
    padding: 1rem 1.5rem;
}

.typing-dots {
    display: flex;
    gap: 0.4rem;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* =============================================================================
   INPUT CONTAINER
   ============================================================================= */
.input-container {
    padding: 1rem 2rem 1.5rem;
    background: var(--primary-color);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem;
    max-width: 900px;
    margin: 0 auto;
    transition: border-color 0.3s;
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
}

#messageInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: none;
    outline: none;
    max-height: 150px;
    min-height: 24px;
}

#messageInput::placeholder {
    color: var(--text-secondary);
}

.send-button {
    background: var(--highlight-color);
    border: none;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
    background: #ff5577;
    transform: translateY(-2px);
}

.send-button:active:not(:disabled) {
    transform: translateY(0);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-hint {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
}

/* =============================================================================
   MODAL
   ============================================================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    background: var(--secondary-color);
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    border: 1px solid var(--border-color);
    animation: modalSlideIn 0.2s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.25rem;
}

.modal-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.modal-input:focus {
    border-color: var(--accent-color);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-primary {
    background: var(--highlight-color);
    border: 1px solid var(--highlight-color);
    color: var(--text-primary);
}

.btn-primary:hover {
    background: #ff5577;
    border-color: #ff5577;
}

/* =============================================================================
   RESPONSIVE DESIGN
   ============================================================================= */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
    }

    .sidebar-toggle {
        display: none;
    }

    .chat-header {
        padding: 1rem;
    }

    .header-content h1 {
        font-size: 1.1rem;
    }

    .messages-container {
        padding: 1rem;
    }

    .message {
        max-width: 95%;
    }

    .input-container {
        padding: 1rem;
    }

    .quick-prompts {
        grid-template-columns: 1fr;
    }

    .welcome-screen h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1rem;
    }

    .subtitle {
        display: none;
    }

    .message-content {
        font-size: 0.95rem;
    }

    .status-indicator .status-text {
        display: none;
    }

    .quick-prompt {
        padding: 0.75rem;
        font-size: 0.85rem;
    }
}

/* Overlay for mobile */
@media (max-width: 768px) {
    .sidebar.open::after {
        content: '';
        position: fixed;
        left: var(--sidebar-width);
        top: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
    }
}