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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

header h1 {
    font-size: 2em;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.nav-links a, .btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
    border: 2px solid transparent;
    display: inline-block;
    cursor: pointer;
    font-size: 14px;
}

.nav-links a:hover, .btn:hover {
    background: white;
    color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.content {
    padding: 40px;
}

.flash-messages {
    margin-bottom: 20px;
}

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.note-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
    cursor: pointer;
    position: relative;
}

.note-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.note-card h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3em;
}

.note-card .category {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    margin-bottom: 10px;
    font-weight: 600;
}

.note-card .content-preview {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.6;
    max-height: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.note-card .meta {
    color: #999;
    font-size: 12px;
    margin-bottom: 15px;
}

.note-card .actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 6px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-view {
    background: #17a2b8;
    color: white;
}

.btn-view:hover {
    background: #138496;
}

.btn-edit {
    background: #ffc107;
    color: #333;
}

.btn-edit:hover {
    background: #e0a800;
}

.btn-delete {
    background: #dc3545;
    color: white;
}

.btn-delete:hover {
    background: #c82333;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state h2 {
    font-size: 2em;
    margin-bottom: 10px;
}

.empty-state p {
    margin-bottom: 20px;
}

.note-detail {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 30px;
}

.note-detail h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 2em;
}

.note-detail .category {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    margin-bottom: 20px;
    font-weight: 600;
}

.note-detail .content {
    background: white;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 20px;
    line-height: 1.8;
    color: #333;
    white-space: pre-wrap;
}

.note-detail .meta {
    color: #666;
    font-size: 14px;
    margin-bottom: 20px;
    padding: 15px;
    background: white;
    border-radius: 8px;
}

.filter-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.filter-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    align-items: end;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
}

.stat-card h3 {
    font-size: 2.5em;
    margin-bottom: 5px;
}

.stat-card p {
    font-size: 14px;
    opacity: 0.9;
}

.category-breakdown {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.category-breakdown h3 {
    margin-bottom: 15px;
    color: #333;
}

.category-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background: white;
    margin-bottom: 10px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.back-link {
    display: inline-block;
    margin-bottom: 20px;
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        border-radius: 0;
    }
    
    .content {
        padding: 20px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 1.5em;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
}

.nav-links a.logout-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.nav-links a.logout-btn:hover {
    background: rgba(255, 77, 77, 0.9);
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
}