:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.health-status {
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    display: inline-block;
}

.health-status.healthy {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.health-status.degraded {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
    margin-bottom: 2rem;
}

@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Panels */
.editor-panel, .pdf-panel {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.panel-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

/* Editor */
.editor-wrapper {
    margin-bottom: 1.5rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.CodeMirror {
    height: 500px;
    font-size: 14px;
    font-family: 'Fira Code', 'Consolas', monospace;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

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

.filename-input-group {
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: border-color 0.3s;
}

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

#filename-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.file-extension {
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-large {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
}

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

/* Message Area */
.message-area {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    display: none;
}

.message-area.show {
    display: block;
    animation: slideIn 0.3s ease-out;
}

.message-area.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.message-area.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

/* PDF List */
.pdf-list {
    max-height: 600px;
    overflow-y: auto;
}

.pdf-item {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
}

.pdf-item:hover {
    background: var(--border-color);
    transform: translateX(4px);
}

.pdf-info {
    flex: 1;
}

.pdf-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.pdf-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.3s;
    font-size: 1.2rem;
}

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

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

/* Loading */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.footer p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.mcp-info a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color 0.3s;
}

.mcp-info a:hover {
    color: var(--secondary-color);
}

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

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

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

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

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

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