* {
    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: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: white;
    padding: 20px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    min-height: 600px;
}

.control-panel {
    background: #f8f9fa;
    padding: 20px;
    border-right: 2px solid #e9ecef;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 10px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 10px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.stats {
    background: #e3f2fd;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
}

.stats h3 {
    color: #1976d2;
    margin-bottom: 10px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 14px;
}

.visualization {
    padding: 20px;
    overflow-y: auto;
}

.clock {
    text-align: center;
    font-size: 1.2em;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 20px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
}

.lsm-structure {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.memtable, .sstable-level {
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 15px;
    background: white;
}

.memtable {
    border-color: #28a745;
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
}

.memtable h3 {
    color: #155724;
    margin-bottom: 10px;
}

.sstable-level h3 {
    color: #721c24;
    margin-bottom: 10px;
}

.sstable-level {
    border-color: #dc3545;
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
}

.data-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 40px;
    align-items: flex-start;
}

.data-item {
    background: white;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 5px 10px;
    font-size: 12px;
    font-family: monospace;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    animation: fadeIn 0.3s ease-in;
}

.data-item.new {
    background: #fff3cd;
    border-color: #ffeaa7;
    animation: pulse 0.6s ease-in-out;
}

.data-item.compacting {
    background: #ffeaa7;
    animation: shake 0.5s ease-in-out;
}

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.operation-log {
    background: #f8f9fa;
    border: 2px solid #dee2e6;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    max-height: 180px;
    overflow-y: auto;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.operation-log h3 {
    margin-bottom: 12px;
    color: #2c3e50;
    font-size: 1.1em;
    font-weight: 600;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 5px;
}

.log-entry {
    font-family: monospace;
    font-size: 12px;
    padding: 2px 0;
    border-bottom: 1px solid #e9ecef;
}

.log-entry:last-child {
    border-bottom: none;
}

.log-entry.write { color: #28a745; }
.log-entry.read { color: #007bff; }
.log-entry.compact { color: #dc3545; }
.log-entry.flush { color: #fd7e14; }

.compaction-indicator {
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    background: #dc3545;
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 600;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0.3; }
}

.level-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.search-result {
    background: #d1ecf1;
    border: 2px solid #bee5eb;
    border-radius: 8px;
    padding: 10px;
    margin-top: 10px;
    font-family: monospace;
}

.search-result.found {
    background: #d4edda;
    border-color: #c3e6cb;
}

.search-result.not-found {
    background: #f8d7da;
    border-color: #f5c6cb;
}

.wal {
    border-color: #17a2b8;
    background: linear-gradient(135deg, #d1ecf1, #bee5eb);
}

.wal h3 {
    color: #0c5460;
    margin-bottom: 10px;
}

.wal-entry {
    background: white;
    border: 1px solid #17a2b8;
    border-radius: 5px;
    padding: 5px 10px;
    font-size: 11px;
    font-family: monospace;
    margin-bottom: 3px;
    animation: walWrite 0.5s ease-in;
}

.wal-entry.writing {
    background: #fff3cd;
    border-color: #ffc107;
    animation: pulse 0.3s ease-in-out;
}

@keyframes walWrite {
    0% { transform: translateX(-20px); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
}

.write-process {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #28a745;
}

.write-step {
    background: #e9ecef;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    transition: all 0.3s;
}

.write-step.active {
    background: #28a745;
    color: white;
    transform: scale(1.05);
}

.write-step.completed {
    background: #6c757d;
    color: white;
}

.arrow {
    font-size: 16px;
    color: #6c757d;
}