:root { --bg: #f4f6fa; --card: #fff; --ink: #1c2430; --muted: #6b7686; --line: #e1e6ee; --brand: #0068ff; --ok: #1a8d4b; --bad: #c62828; --wait: #b26a00; }
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* without this, `main { display: grid }` and `.row`/`button` rules override the hidden attribute */
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 system-ui, "Segoe UI", sans-serif; }
header { display: flex; align-items: center; gap: 12px; padding: 14px 20px; background: var(--card); border-bottom: 1px solid var(--line); }
h1 { margin: 0; font-size: 18px; } h2 { margin: 0 0 8px; font-size: 16px; } h3 { margin: 18px 0 8px; font-size: 14px; }
header .ghost { margin-left: auto; }
main { max-width: 860px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
.tab-link { display: inline-block; padding: 7px 13px; border-radius: 7px; color: var(--muted); text-decoration: none; font-weight: 500; font-size: 14px; }
.tab-link:hover { color: var(--ink); background: #eef2f7; }
.tab-link.active { color: var(--brand); background: #eaf1ff; font-weight: 600; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; min-width: 0; overflow-wrap: break-word; }
.narrow { max-width: 420px; margin: 40px auto; }
.muted { color: var(--muted); margin: 4px 0 10px; }
.error { color: var(--bad); margin: 6px 0; min-height: 1em; }
code, pre { font-family: ui-monospace, Consolas, monospace; font-size: 13px; background: #eef1f6; border-radius: 4px; }
code { padding: 1px 5px; word-break: break-word; } pre { padding: 10px; overflow-x: auto; white-space: pre-wrap; word-break: break-word; }
.badge { padding: 2px 10px; border-radius: 99px; font-size: 13px; background: #e8ecf3; color: var(--muted); }
.badge.ok { background: #e1f4e8; color: var(--ok); } .badge.bad { background: #fde7e7; color: var(--bad); } .badge.wait { background: #fff1d9; color: var(--wait); }
button { font: inherit; cursor: pointer; border: 0; border-radius: 7px; padding: 7px 14px; background: var(--brand); color: #fff; }
button.ghost { background: #eaf1ff; color: var(--brand); } button.danger { background: #fde7e7; color: var(--bad); }
button.small { padding: 3px 9px; font-size: 13px; } button:hover { filter: brightness(.95); }
input, select, textarea { width: 100%; font: inherit; padding: 7px 10px; border: 1px solid var(--line); border-radius: 7px; background: #fff; }
label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
form { display: grid; gap: 10px; } .grid { grid-template-columns: repeat(2, 1fr); } .grid .row { grid-column: 1 / -1; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; word-break: break-word; }
th { color: var(--muted); font-weight: 500; font-size: 13px; } td.actions { white-space: nowrap; text-align: right; }
.groups { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
#qr-box { margin: 10px 0; } #qr { border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.members-box { margin-top: 16px; padding: 14px; background: #fafbfc; border: 1px solid var(--line); border-radius: 8px; display: grid; gap: 10px; }
.members-header { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.members-header h3 { margin: 0; }
.members-filter { max-width: 280px; }
.tag-section { display: grid; gap: 6px; }
.preview-box { background: #fafbfc; border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; display: grid; gap: 6px; }
.preview-header { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 13px; }
.preview-tags { font-size: 13px; word-break: break-word; }
.history-filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.history-filters select { width: auto; min-width: 130px; }
.history-filters input[type="search"] { flex: 1; min-width: 160px; }
.history-more-row { margin-top: 12px; }
.alert-box { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; line-height: 1.4; }
.alert-box.error { background: #fde7e7; color: var(--bad); border: 1px solid #f8b4b4; }
.new-key-card { background: #f6ffed; border: 1px solid #b7eb8f; border-radius: 8px; padding: 14px; margin-bottom: 16px; display: grid; gap: 8px; }
.new-key-card h4 { margin: 0; color: var(--ok); font-size: 15px; }
.warning-text { color: var(--bad); font-size: 13px; margin: 0; }
.doc-block { margin-top: 16px; padding: 12px 14px; background: #fafbfc; border: 1px solid var(--line); border-radius: 8px; }
.doc-block h4 { margin: 0 0 4px; font-size: 14px; }
.doc-block h5 { margin: 10px 0 4px; font-size: 13px; color: var(--muted); }

.session-alert { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.session-alert-content { flex: 1; min-width: 200px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin: 10px 0 16px; }
.stat-card { background: #fafbfc; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; text-align: center; }
.stat-lbl { font-size: 12px; color: var(--muted); line-height: 1.3; }
.stat-val { font-size: 22px; font-weight: 700; color: var(--ink); margin-top: 4px; font-variant-numeric: tabular-nums; }
.stat-val.ok { color: var(--ok); } .stat-val.bad { color: var(--bad); } .stat-val.wait { color: var(--wait); }
.overview-meta { background: #fafbfc; border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; margin: 12px 0 16px; display: grid; gap: 6px; font-size: 14px; }
.overview-meta p { margin: 0; }
.meta-val { color: var(--ink); font-weight: 500; }
.chart-container { width: 100%; overflow-x: auto; background: #fafbfc; border: 1px solid var(--line); border-radius: 8px; padding: 10px; margin: 10px 0 16px; min-height: 140px; display: flex; align-items: center; justify-content: center; }
.chart-svg { width: 100%; max-width: 580px; height: auto; display: block; margin: 0 auto; }
.chart-line { stroke: var(--line); stroke-width: 1; }
.chart-bar-bg { fill: #edf2f7; rx: 3px; ry: 3px; }
.chart-bar { fill: #9ec5fe; rx: 3px; ry: 3px; cursor: pointer; transition: fill 0.15s; }
.chart-bar:hover { fill: var(--brand); }
.chart-bar.today { fill: var(--brand); }
.chart-bar.has-error { fill: #f87171; }
.chart-text { font-size: 9px; fill: var(--muted); text-anchor: middle; font-family: system-ui, sans-serif; }
.chart-text.val { font-size: 9px; fill: var(--ink); font-weight: 600; }

@media (max-width: 600px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .session-alert { flex-direction: column; align-items: flex-start; }
  .grid { grid-template-columns: 1fr; }
  .members-filter { max-width: 100%; }
  .history-filters select, .history-filters input { width: 100%; min-width: 0; }
}