:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.5rem;
}

.nav {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.anycoder-link {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white !important;
    font-weight: 500;
}

.anycoder-link:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.main-container {
    display: flex;
    height: calc(100vh - 73px);
    max-width: 1400px;
    margin: 0 auto;
    gap: 1rem;
    padding: 1rem;
}

.sidebar {
    width: 320px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    overflow-y: auto;
    box-shadow: var(--shadow-md);
}

.model-selector h3 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
}

.search-box {
    position: relative;
    margin-bottom: 1rem;
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
}

.search-box input {
    width: 100%;
    padding: 0.625rem 1rem 0.625rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.model-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.category-btn {
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.category-btn:hover {
    background: var(--bg-tertiary);
}

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

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

.model-item {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.model-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
}

.model-item.selected {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
    border-color: var(--primary-color);
}

.model-name {
    font-weight: 500;
    font-size: 0.875rem;
}

.model-size {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.chat-container {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.current-model {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

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

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

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    padding: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.welcome-message {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.welcome-message i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.welcome-message h2 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.quick-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.example-btn {
    padding: 0.75rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.example-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.message {
    display: flex;
    gap: 0.75rem;
    animation: fadeIn 0.3s ease-in;
}

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

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    flex-shrink: 0;
}

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

.message.assistant .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.message-content {
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
}

.message-text {
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 0.25rem;
}

.typing-indicator {
    display: flex;
    gap: 0.25rem;
    padding: 0.5rem 0;
}

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

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

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

.chat-input-container {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.input-wrapper {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.75rem;
    transition: all 0.2s;
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

#messageInput {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.875rem;
    resize: none;
    outline: none;
    max-height: 120px;
    line-height: 1.5;
}

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

.input-actions {
    display: flex;
    gap: 0.5rem;
}

.input-action-btn {
    padding: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

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

.send-btn {
    padding: 0.5rem 0.75rem;
    background: var(--primary-color);
    border: none;
    color: white;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.send-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

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

.input-info {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.settings-modal, .model-info-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.settings-modal.active, .model-info-modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

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

.modal-body {
    padding: 1.5rem;
}

.setting-group {
    margin-bottom: 1.5rem;
}

.setting-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.setting-group input[type="range"] {
    width: 100%;
    margin-bottom: 0.5rem;
}

.setting-group select,
.setting-group textarea {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.setting-group textarea {
    resize: vertical;
    min-height: 80px;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.btn-primary {
    padding: 0.625rem 1.25rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.model-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    text-align: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.stat-card i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-card h4 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-card p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.model-categories-info ul {
    list-style: none;
    padding: 0;
}

.model-categories-info li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.model-categories-info li:last-child {
    border-bottom: none;
}

@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        max-height: 300px;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .quick-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .example-btn {
        width: 100%;
        max-width: 250px;
    }
    
    .model-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 1rem;
    }
    
    .nav {
        gap: 0.5rem;
    }
    
    .nav-link span {
        display: none;
    }
    
    .main-container {
        padding: 0.5rem;
        gap: 0.5rem;
    }
    
    .chat-header {
        padding: 0.75rem 1rem;
    }
    
    .chat-messages {
        padding: 1rem;
    }
    
    .chat-input-container {
        padding: 0.75rem 1rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .sidebar {
        width: 100%;
        max-height: 250px;
    }
}