/* Global Styles */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --background: #0f0f0f;
    --surface: #1a1a1a;
    --surface-hover: #262626;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #333;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --sidebar-width: 260px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

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

.sidebar-header h2 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-header i {
    color: var(--primary-color);
}

.mobile-toggle, .mobile-menu {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
}

.new-chat-btn {
    margin: 1rem;
    padding: 0.75rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background-color 0.2s;
}

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

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.chat-item {
    padding: 0.75rem 1rem;
    margin-bottom: 0.25rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-item:hover {
    background-color: var(--surface-hover);
}

.chat-item.active {
    background-color: var(--surface-hover);
    border-left: 3px solid var(--primary-color);
}

.chat-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.875rem;
}

.chat-item-delete {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    transition: opacity 0.2s, color 0.2s;
}

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

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

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

.settings-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background-color 0.2s;
}

.settings-btn:hover {
    background-color: var(--surface-hover);
}

/* Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--background);
}

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

.model-selector select {
    padding: 0.5rem 1rem;
    background-color: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
}

.clear-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    color: var(--text-secondary);
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: color 0.2s, background-color 0.2s;
}

.clear-btn:hover {
    color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.welcome-message {
    text-align: center;
    margin: auto;
    max-width: 600px;
}

.welcome-message h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.suggestions button {
    padding: 0.75rem 1.5rem;
    background-color: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.suggestions button:hover {
    background-color: var(--surface-hover);
    transform: translateY(-2px);
}

/* Message Styles */
.message {
    display: flex;
    gap: 1rem;
    max-width: 800px;
    width: 100%;
    animation: fadeIn 0.3s ease;
}

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

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

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.25rem;
}

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

.message.assistant .message-avatar {
    background-color: var(--surface);
    color: var(--primary-color);
}

.message-content {
    flex: 1;
    padding: 1rem;
    border-radius: 0.5rem;
    font-size: 0.9375rem;
    line-height: 1.6;
}

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

.message.assistant .message-content {
    background-color: var(--surface);
    color: var(--text-primary);
}

.message-content pre {
    background-color: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 0.5rem 0;
}

.message-content code {
    background-color: rgba(0, 0, 0, 0.3);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.875em;
}

.message-content pre code {
    background-color: transparent;
    padding: 0;
}

.typing-indicator {
    display: flex;
    gap: 0.25rem;
    padding: 1rem;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    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% {
        opacity: 0.3;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-10px);
    }
}

/* Input Container */
.input-container {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--surface);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    max-width: 800px;
    margin: 0 auto;
}

#messageInput {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.9375rem;
    resize: none;
    min-height: 44px;
    max-height: 200px;
    font-family: inherit;
    line-height: 1.5;
}

#messageInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

.send-btn {
    padding: 0.75rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
    min-width: 44px;
    height: 44px;
}

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

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

.input-info {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.75);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-content {
    background-color: var(--surface);
    border-radius: 0.75rem;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalIn 0.2s ease;
}

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

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

.modal-header h2 {
    font-size: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: color 0.2s;
}

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

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.settings-section {
    margin-bottom: 2rem;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.settings-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.api-key-group {
    margin-bottom: 1rem;
}

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

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

.input-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

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

.input-group button {
    padding: 0.75rem 1rem;
    background-color: var(--background);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.input-group button:hover {
    color: var(--text-primary);
    background-color: var(--surface-hover);
}

.preference-item {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.preference-item label {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.preference-item input[type="range"] {
    flex: 2;
}

.preference-item input[type="number"] {
    width: 100px;
    padding: 0.5rem;
    background-color: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

.danger-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--danger);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    margin-right: 1rem;
    transition: opacity 0.2s;
}

.danger-btn:hover {
    opacity: 0.9;
}

.export-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

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

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

    .mobile-toggle, .mobile-menu {
        display: block;
    }

    .messages-container {
        padding: 1rem;
    }

    .message {
        max-width: 100%;
    }

    .suggestions {
        flex-direction: column;
    }

    .suggestions button {
        width: 100%;
    }
}