/* SGOU AI Assistant - Modern Chat Interface */

:root {
    --primary-color: #00a67e;
    --primary-hover: #008f6b;
    --primary-light: rgba(0, 166, 126, 0.1);
    --secondary-color: #6366f1;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --success-color: #10b981;
    
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-hover: #2a2a2a;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #6b6b6b;
    
    --border-color: #333333;
    --border-light: #404040;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --sidebar-width: 280px;
    --header-height: 60px;
    --input-height: 80px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    --font-sans: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Light Mode */
.light-mode {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #ebebeb;
    --bg-hover: #e5e5e5;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #e0e0e0;
    --border-light: #d0d0d0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

/* App Container */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal);
    z-index: 100;
}

.sidebar.collapsed {
    transform: translateX(-100%);
    position: absolute;
    height: 100%;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.logo i {
    font-size: 1.6rem;
}

.new-chat-btn {
    width: 100%;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.new-chat-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.new-chat-btn:active {
    transform: translateY(0);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.chat-history-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-history-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chat-history-item {
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    transition: all var(--transition-fast);
}

.chat-history-item:hover {
    background: var(--bg-hover);
}

.chat-history-item.active {
    background: var(--primary-light);
    border: 1px solid var(--primary-color);
}

.chat-history-item .title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.9rem;
}

.chat-history-item .delete-btn {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    transition: all var(--transition-fast);
}

.chat-history-item:hover .delete-btn {
    opacity: 1;
}

.chat-history-item .delete-btn:hover {
    color: var(--danger-color);
}

.empty-history {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    padding: 20px;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-btn {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all var(--transition-fast);
}

.sidebar-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.main-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: 16px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
}

.main-header h1 {
    flex: 1;
    font-size: 1.1rem;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px;
}

.welcome-screen.hidden {
    display: none;
}

.welcome-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.welcome-screen h2 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.welcome-screen p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.quick-action-btn {
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

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

.messages-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
}

.messages-container:empty + .welcome-screen {
    display: flex;
}

/* Message Styles */
.message {
    display: flex;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

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

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.9rem;
}

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

.message.user .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.message-content {
    max-width: 80%;
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    line-height: 1.6;
}

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

.message.user .message-content {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-top-right-radius: var(--radius-sm);
}

.message-content pre {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 10px 0;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.message-content code {
    font-family: var(--font-mono);
    background: var(--bg-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.message-content pre code {
    background: none;
    padding: 0;
}

.message-content ul, .message-content ol {
    margin: 10px 0;
    padding-left: 20px;
}

.message-content li {
    margin: 6px 0;
}

.message-content a {
    color: var(--primary-color);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

.message.user .message-content a {
    color: white;
    text-decoration: underline;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 0;
}

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

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

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

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-6px); }
}

/* Input Area */
.input-area {
    padding: 16px 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.input-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: 12px;
    align-items: flex-end;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 8px 12px;
    transition: border-color var(--transition-fast);
}

.input-container:focus-within {
    border-color: var(--primary-color);
}

.input-container textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    resize: none;
    outline: none;
    max-height: 200px;
    min-height: 24px;
    line-height: 1.5;
    padding: 8px 0;
}

.input-container textarea::placeholder {
    color: var(--text-muted);
}

.send-btn {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.send-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    background: var(--bg-hover);
    color: var(--text-muted);
    cursor: not-allowed;
}

.input-footer {
    max-width: 900px;
    margin: 8px auto 0;
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.3s ease;
}

.modal-content.modal-large {
    max-width: 800px;
}

.modal-content.modal-small {
    max-width: 400px;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

/* Knowledge Base */
.kb-actions {
    margin-bottom: 20px;
}

.kb-document-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.kb-document-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.kb-document-item .doc-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.kb-document-item .doc-info {
    flex: 1;
    min-width: 0;
}

.kb-document-item .doc-name {
    font-weight: 600;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.kb-document-item .doc-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.kb-document-item .doc-actions {
    display: flex;
    gap: 8px;
}

.kb-document-item .doc-actions button {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.kb-document-item .doc-actions button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

.kb-document-item .doc-actions .delete:hover {
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.kb-document-item .toggle-active {
    cursor: pointer;
}

.kb-document-item .toggle-active.active {
    color: var(--success-color);
    border-color: var(--success-color);
}

/* Add Document Form */
.add-document-form {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-top: 16px;
}

.add-document-form.hidden {
    display: none;
}

.add-document-form h3 {
    margin-bottom: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
    font-family: var(--font-sans);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 20px;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

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

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

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

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

/* Settings */
.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-item label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    cursor: pointer;
}

.setting-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.setting-item input[type="range"] {
    width: 100%;
    margin-top: 8px;
    accent-color: var(--primary-color);
}

.setting-value {
    color: var(--primary-color);
    font-weight: 600;
}

.setting-info {
    margin-top: 16px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.setting-info i {
    color: var(--secondary-color);
    margin-right: 6px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 100px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 2000;
}

.toast {
    padding: 14px 20px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: toastIn 0.3s ease;
    max-width: 350px;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-color: var(--success-color);
}

.toast.success i {
    color: var(--success-color);
}

.toast.error {
    border-color: var(--danger-color);
}

.toast.error i {
    color: var(--danger-color);
}

.toast.info {
    border-color: var(--secondary-color);
}

.toast.info i {
    color: var(--secondary-color);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    background: var(--bg-secondary);
    padding: 30px 50px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
}

.loading-spinner i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
.sidebar {
position: absolute;
height: 100%;
z-index: 200;
width: min(var(--sidebar-width), 85vw);
max-width: 320px;
}

.sidebar.collapsed {
transform: translateX(-100%);
}

.main-header {
padding: 0 12px;
}

.chat-container {
padding: 0;
}

.messages-container {
padding: 16px 12px;
gap: 16px;
}

.message {
gap: 10px;
}

.message-avatar {
width: 32px;
height: 32px;
}

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

.input-area {
padding: 12px;
padding-bottom: calc(12px + env(safe-area-inset-bottom));
}

#messageInput {
font-size: 16px;
}

.menu-toggle {
display: block;
}

.welcome-screen h2 {
font-size: 1.4rem;
}

.quick-actions {
flex-direction: column;
}

.quick-action-btn {
width: 100%;
}

.message-content {
max-width: 90%;
}

.modal-content {
width: 95%;
max-height: 85vh;
}

.kb-document-item {
flex-wrap: wrap;
}

.kb-document-item .doc-actions {
width: 100%;
justify-content: flex-end;
margin-top: 8px;
}
}

@media (max-width: 480px) {
.sidebar-header {
padding: 16px;
}

.sidebar-content {
padding: 12px;
}

.sidebar-footer {
padding: 12px;
}

.logo {
font-size: 1.2rem;
}

.new-chat-btn {
padding: 10px 14px;
font-size: 0.9rem;
}

.messages-container {
padding: 14px 10px;
}

.message-content {
max-width: 100%;
}
}

/* Hidden utility */
.hidden {
display: none !important;
}