:root {
    --bg: #0f172a;
    --surface: #111827;
    --panel: #0b1220;
    --border: #1f2937;
    --primary: #3b82f6;
    --text: #e5e7eb;
    --muted: #9ca3af;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #ffffff;
        --surface: #f8fafc;
        --panel: #ffffff;
        --border: #e5e7eb;
        --primary: #2563eb;
        --text: #111827;
        --muted: #6b7280;
    }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}
.container { max-width: 1100px; margin: 0 auto; padding: 24px 16px; }
.tool-header { text-align: center; margin-bottom: 16px; }
.tool-header h1 { margin: 0 0 8px; font-size: 28px; }
.subtitle { color: var(--muted); }

.upload-section { margin: 20px 0; }
.upload-area {
    border: 2px dashed var(--border);
    border-radius: 12px;
    background: var(--surface);
    padding: 22px;
    text-align: center;
    cursor: pointer;
}
.upload-area:hover { border-color: var(--primary); }
.upload-area.dragover { border-color: var(--primary); background: rgba(59, 130, 246, 0.08); }
.upload-icon { width: 36px; height: 36px; fill: var(--muted); }
.hint { color: var(--muted); font-size: 12px; }
.controls-row { display: flex; gap: 8px; align-items: center; margin-top: 12px; }
.controls-row label { font-size: 14px; color: var(--muted); }
.controls-row select { padding: 8px; background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 8px; }

.editor-controls { display: grid; grid-template-columns: 80px minmax(120px, 1fr) 1fr auto auto auto; gap: 8px; align-items: center; margin: 16px 0; }
.label { color: var(--muted); font-size: 14px; }
.input { padding: 10px; background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 8px; }
.btn { padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.status { margin-left: 8px; font-size: 12px; color: var(--muted); }

.editor-toolbar { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; }
.toolbar-group { display: flex; gap: 8px; flex-wrap: wrap; }

.selection-tools { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.selection-tools .toolbar-group { flex: 1; }
.selection-tools .hint { margin: 0; font-size: 12px; color: var(--muted); }

.search-panel { display: grid; gap: 8px; margin-bottom: 16px; }
.search-controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.search-buttons { display: flex; gap: 8px; }

.stats-panel { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.panel-heading { margin: 0 0 12px; font-size: 16px; font-weight: 600; }
.selection-info { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 12px; }
.selection-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.selection-summary { font-size: 13px; font-variant-numeric: tabular-nums; }
.selection-tip { margin-top: 12px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; }
.stat-item { display: flex; flex-direction: column; gap: 4px; }
.stat-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stat-value { font-size: 16px; font-variant-numeric: tabular-nums; }

.table-wrapper { border: 1px solid var(--border); border-radius: 12px; overflow: auto; background: var(--panel); }
table { width: 100%; border-collapse: collapse; }
thead th { position: sticky; top: 0; background: var(--surface); font-weight: 600; }
th, td { border: 1px solid var(--border); padding: 8px 10px; font-size: 14px; }
td { background: var(--panel); }
td.selected { outline: 2px solid var(--primary); outline-offset: -2px; }
td.range-selected { background: rgba(59, 130, 246, 0.12); }
td.search-match { background: rgba(59, 130, 246, 0.18); }
td.search-active { box-shadow: inset 0 0 0 2px var(--primary); }
td.editing { padding: 0; }
td.editing input { width: 100%; height: 100%; border: 0; padding: 8px 10px; background: var(--panel); color: var(--text); font: inherit; }
td.editing input:focus { outline: none; }

.visually-hidden { position: absolute !important; height: 1px; width: 1px; overflow: hidden; clip: rect(1px, 1px, 1px, 1px); white-space: nowrap; }

@media (max-width: 720px) {
    .editor-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows: auto; }
    .editor-controls .label, .editor-controls .hint { grid-column: span 2; }
    .editor-toolbar { flex-direction: column; }
    .selection-tools { flex-direction: column; align-items: stretch; }
    .search-controls { flex-direction: column; align-items: stretch; }
    .search-buttons { justify-content: space-between; }
}