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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #1e1e1e;
    color: #d4d4d4;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: #2d2d2d;
    padding: 15px 20px;
    border-bottom: 1px solid #3e3e3e;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.header h1 {
    font-size: 18px;
    margin-right: 20px;
    color: #fff;
}

input[type="file"] {
    display: none;
}

.btn {
    background: #0e639c;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: background 0.2s;
}

.btn:hover {
    background: #1177bb;
}

.btn.active {
    background: #1177bb;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);
}

.btn-secondary {
    background: #3c3c3c;
}

.btn-secondary:hover {
    background: #4c4c4c;
}

.btn-small {
    padding: 4px 8px;
    font-size: 11px;
}

.search-box {
    background: #3c3c3c;
    border: 1px solid #5c5c5c;
    color: #d4d4d4;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 13px;
    width: 200px;
}

.search-box:focus {
    outline: none;
    border-color: #0e639c;
}

.view-tabs {
    display: flex;
    gap: 5px;
    margin-left: auto;
}

.main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.input-panel, .output-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.input-panel {
    border-right: 1px solid #3e3e3e;
}

.panel-header {
    background: #2d2d2d;
    padding: 10px 15px;
    font-size: 12px;
    text-transform: uppercase;
    color: #808080;
    border-bottom: 1px solid #3e3e3e;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

textarea {
    flex: 1;
    background: #1e1e1e;
    color: #d4d4d4;
    border: none;
    padding: 15px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    resize: none;
    outline: none;
    line-height: 1.5;
}

.output-content {
    flex: 1;
    overflow: auto;
    padding: 15px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    line-height: 1.6;
}

.error {
    color: #f48771;
    padding: 15px;
}

.stats {
    background: #2d2d2d;
    padding: 8px 15px;
    font-size: 12px;
    color: #808080;
    border-top: 1px solid #3e3e3e;
}

.highlight {
    background: rgba(255, 255, 0, 0.3);
    border-radius: 2px;
}

.empty-state {
    color: #808080;
    text-align: center;
    padding: 40px;
}