:root {
  --bg: #f5f6f8; --card: #fff; --text: #1c2430; --muted: #6b7684;
  --accent: #2563eb; --accent-dark: #1d4ed8; --border: #dde2e8;
  --error: #b91c1c; --ok: #15803d; --notice-bg: #fef9c3;
}
* { box-sizing: border-box; }
body {
  margin: 0; font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--text);
}
main { max-width: 1200px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.5rem; } h2 { font-size: 1.15rem; } h3 { font-size: 1rem; }

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  background: #fff; border-bottom: 1px solid var(--border); padding: 8px 16px;
}
.topbar nav a { margin-right: 16px; color: var(--text); text-decoration: none; }
.topbar nav a.brand { font-weight: 700; color: var(--accent); }
.topbar nav a:hover { color: var(--accent); }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 20px; margin: 16px 0;
}
.card.narrow { max-width: 420px; margin: 40px auto; }
.center-page { display: flex; min-height: 100vh; align-items: flex-start; justify-content: center; }

label { display: block; margin: 10px 0; }
input, select {
  font: inherit; padding: 7px 10px; border: 1px solid var(--border); border-radius: 6px;
  width: 100%; max-width: 340px; background: #fff;
}
input[type="checkbox"] { width: auto; }
.inline-label { display: inline-flex; gap: 6px; align-items: center; margin-left: 12px; }
button, .button {
  font: inherit; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--border);
  background: #fff; cursor: pointer; text-decoration: none; color: var(--text); display: inline-block;
}
button:hover, .button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { background: var(--accent-dark); }
button.link { border: none; background: none; color: var(--accent); padding: 0 4px; }
form.inline { display: inline-flex; gap: 8px; align-items: center; }
.row { display: flex; gap: 24px; flex-wrap: wrap; align-items: flex-end; }

.muted { color: var(--muted); }
.error { color: var(--error); }
.notice { background: var(--notice-bg); padding: 8px 12px; border-radius: 6px; }
.badge {
  font-size: 0.75rem; padding: 2px 10px; border-radius: 999px; vertical-align: middle;
  background: var(--border); color: var(--muted);
}
.badge.ok { background: #dcfce7; color: var(--ok); }

.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .upload-grid { grid-template-columns: 1fr; } }
fieldset { border: 1px solid var(--border); border-radius: 8px; }
.dropzone {
  border: 2px dashed var(--border); border-radius: 8px; padding: 18px; text-align: center;
  transition: border-color .15s, background .15s;
}
.dropzone.dragover { border-color: var(--accent); background: #eff6ff; }
.dropzone .filename { font-weight: 600; word-break: break-all; }

table.simple, table.data { border-collapse: collapse; width: 100%; }
table.simple th, table.simple td, table.data th, table.data td {
  border: 1px solid var(--border); padding: 6px 10px; text-align: left; vertical-align: top;
}
table.simple th { background: #f0f2f5; }
table.data thead th { background: #f0f2f5; position: sticky; top: 0; white-space: nowrap; }
table.data th.num, table.data td.num { text-align: right; }
th.sortable { cursor: pointer; user-select: none; }
th.sortable:hover { color: var(--accent); }
th.sortable.asc::after { content: " ▲"; font-size: .7em; }
th.sortable.desc::after { content: " ▼"; font-size: .7em; }
.scroll-x { overflow-x: auto; }
td.w1 { color: var(--ok); font-weight: 600; }
td.w2 { color: var(--accent); font-weight: 600; }
tr.flag-anomaly td { background: #fff7ed; }
tr.flag-multi td { background: #fdf4ff; }
.flags-note { font-size: .75rem; color: var(--muted); }

.stats-row { display: flex; gap: 12px; flex-wrap: wrap; }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 18px; text-align: center; min-width: 90px;
}
.stat b { display: block; font-size: 1.3rem; }
.stat span { color: var(--muted); font-size: .8rem; }

.table-controls { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.table-controls input[type="search"] { max-width: 280px; }
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.filters button { padding: 5px 10px; font-size: .85rem; }
.filters button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.pager { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
.pager select { width: auto; }
details summary { cursor: pointer; color: var(--accent); }