/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #8b7355;
    --secondary-color: #6b5745;
    --accent-color: #a68968;
    --bg-color: #f5f5f5;
    --surface-color: #ffffff;
    --text-primary: #2d2d2d;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --success-color: #10a37f;
    --error-color: #ef4444;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: flex;
}

/* Login Screen */
#login-screen {
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.login-container {
    background: var(--surface-color);
    border-radius: 16px;
    padding: 48px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.1);
}

.error-message {
    color: var(--error-color);
    font-size: 14px;
    padding: 12px;
    background-color: #fef2f2;
    border-radius: 8px;
    display: none;
}

.error-message.show {
    display: block;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

.btn-primary:disabled {
    background: #cccccc;
    cursor: not-allowed;
    transform: none;
}

.login-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Chat Screen */
#chat-screen {
    flex-direction: column;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.chat-header {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

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

.header-left h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
}

.status-badge {
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
    background: #e5e7eb;
    color: var(--text-secondary);
}

.status-badge.active {
    background: #d1fae5;
    color: #065f46;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    font-size: 14px;
    color: var(--text-secondary);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Chat Main Area - Split Layout */
.chat-main {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.chat-main.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}

/* Left Side - Chat Section */
.chat-section {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-right: 1px solid var(--border-color);
    background: var(--bg-color);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.welcome-message {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow);
}

.welcome-message h2 {
    color: var(--primary-color);
    margin-bottom: 16px;
    font-size: 24px;
}

.welcome-message p {
    margin-bottom: 12px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.welcome-message ul {
    margin: 16px 0 16px 24px;
    color: var(--text-secondary);
}

.welcome-message li {
    margin-bottom: 8px;
}

.message {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    color: white;
}

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

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

.message-sender {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.message-content {
    background: var(--surface-color);
    padding: 16px 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.user .message-content {
    background: #f0f4f8;
}

/* Input Area */
.input-container {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 24px 32px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.session-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.message-form {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.message-form textarea {
    flex: 1;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    resize: none;
    transition: all 0.2s;
}

.message-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.1);
}

.btn-send {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.btn-send:disabled {
    background: #cccccc;
    cursor: not-allowed;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 16px;
    z-index: 1000;
}

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

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-overlay p {
    color: white;
    font-size: 16px;
    font-weight: 500;
}

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

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

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

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

/* Tool Execution Status */
.tool-status {
    opacity: 0.8;
}

.tool-indicator {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

.spinner-small {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(139, 115, 85, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.checkmark {
    color: var(--success-color);
    font-size: 16px;
    font-weight: bold;
}

.tool-text {
    font-style: italic;
}

/* Preview Panel - Right Side */
.preview-section {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--surface-color);
}

.preview-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-color);
}

.preview-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.preview-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
}

.preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    gap: 16px;
}

.preview-empty svg {
    color: var(--border-color);
}

.preview-empty p {
    max-width: 280px;
    font-size: 14px;
}

.preview-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.preview-description {
    background: #eff6ff;
    border-left: 3px solid #3b82f6;
    padding: 16px;
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.6;
}

.preview-panel {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.preview-label {
    background: var(--bg-color);
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.preview-code {
    padding: 16px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', 'source-code-pro', monospace;
    font-size: 12px;
    line-height: 1.5;
    background: #f8f9fa;
    color: #2d2d2d;
    overflow-x: auto;
    max-height: 400px; /* Increased from 300px for better visibility */
    overflow-y: auto;
    white-space: pre;
    word-wrap: normal;
    /* Removed word-break: break-all to preserve code formatting */
}

.preview-actions {
    display: flex;
    gap: 12px;
    padding-top: 8px;
}

.preview-actions button {
    flex: 1;
}

.reject-form {
    background: var(--bg-color);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.reject-form textarea {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    min-height: 80px;
}

.reject-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 115, 85, 0.1);
}

.reject-form button {
    flex: 1;
}

.reject-form .btn-secondary {
    flex: 0 0 auto;
    padding: 10px 20px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .chat-main.split-layout {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr auto;
    }

    .preview-section {
        max-height: 50vh;
        border-right: none;
        border-top: 1px solid var(--border-color);
    }

    .chat-section {
        border-right: none;
    }
}

@media (max-width: 768px) {
    .login-container {
        margin: 16px;
        padding: 32px;
    }

    .chat-header {
        padding: 12px 16px;
        flex-wrap: wrap;
    }

    .header-left h1 {
        font-size: 16px;
    }

    .messages-container {
        padding: 16px;
    }

    .input-container {
        padding: 16px;
    }

    .message-form {
        flex-direction: column;
    }

    .btn-send {
        width: 100%;
    }

    .preview-container {
        padding: 16px;
    }

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