:root {
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-color: #3182ce;
    --success-color: #38a169;
    --warning-color: #d69e2e;
    --danger-color: #e53e3e;
    --light-bg: #f7fafc;
    --border-color: #e2e8f0;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-primary);
    min-height: 100vh;
}

.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 0.5px;
}

.sidebar {
    background: white;
    min-height: calc(100vh - 56px);
    border-right: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.sidebar .nav-link {
    color: var(--text-secondary);
    padding: 0.75rem 1.25rem;
    border-radius: 0.375rem;
    margin: 0.25rem 0.75rem;
    transition: all 0.2s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

.sidebar .nav-link i {
    margin-right: 0.75rem;
    width: 20px;
    text-align: center;
}

.card {
    border: none;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card-header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

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

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

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 0.5rem;
    padding: 3rem;
    text-align: center;
    background: white;
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent-color);
    background-color: rgba(49, 130, 206, 0.05);
}

.upload-zone i {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.document-list {
    max-height: 500px;
    overflow-y: auto;
}

.document-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.document-item:hover {
    background-color: var(--light-bg);
}

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

.status-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
}

.status-uploaded {
    background-color: #e2e8f0;
    color: #4a5568;
}

.status-processing {
    background-color: #fef3c7;
    color: #92400e;
}

.status-completed {
    background-color: #c6f6d5;
    color: #22543d;
}

.status-failed {
    background-color: #fed7d7;
    color: #9b2c2c;
}

.editor-container {
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.editor-toolbar {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--light-bg);
    border-radius: 0.5rem 0.5rem 0 0;
}

.editor-content {
    min-height: 500px;
    padding: 1.5rem;
    font-family: 'Georgia', serif;
    font-size: 1rem;
    line-height: 1.8;
    white-space: pre-wrap;
}

.editor-content:focus {
    outline: none;
}

.stats-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 0.5rem;
    padding: 1.5rem;
}

.stats-card h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stats-card p {
    opacity: 0.8;
    margin-bottom: 0;
}

.prompt-editor {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.875rem;
    min-height: 400px;
}

.version-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--light-bg);
    border-radius: 0.25rem;
    color: var(--text-secondary);
}

.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
}

.file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.5rem;
    font-size: 1.25rem;
}

.file-icon.pdf {
    background-color: #fed7d7;
    color: #c53030;
}

.file-icon.docx {
    background-color: #bee3f8;
    color: #2b6cb0;
}

.file-icon.txt {
    background-color: #e2e8f0;
    color: #4a5568;
}

.progress-bar-animated {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 1rem 1rem;
    animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
    from { background-position: 1rem 0; }
    to { background-position: 0 0; }
}

@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .upload-zone {
        padding: 2rem 1rem;
    }
}