:root {
  --bg: #0a0c11;
  --panel: #11141b;
  --panel-2: #171b24;
  --panel-3: #1e2330;
  --border: #252b38;
  --text: #e7eaf0;
  --muted: #8a93a6;
  --faint: #5b6375;
  --accent: #8b6cff;
  --accent-ink: #ffffff;
  --accent-soft: rgba(139, 108, 255, 0.14);
  --cyan: #22d3ee;
  --good: #22c55e;
  --good-soft: rgba(34, 197, 94, 0.15);
  --bad: #f43f5e;
  --bad-soft: rgba(244, 63, 94, 0.15);
  --warn: #f59e0b;
  --x: #60a5fa;
  --o: #f472b6;
  --sq: #1a1f2a;
  --sq-hover: #232a38;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.25);
  --radius: 14px;
  --mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
  color-scheme: dark;
}
:root[data-theme='light'] {
  --bg: #f5f6fa;
  --panel: #ffffff;
  --panel-2: #f3f4f8;
  --panel-3: #e9ebf2;
  --border: #e1e4ec;
  --text: #161a23;
  --muted: #5d6578;
  --faint: #9aa1b2;
  --accent: #6d4aff;
  --accent-soft: rgba(109, 74, 255, 0.1);
  --good-soft: rgba(34, 197, 94, 0.14);
  --bad-soft: rgba(244, 63, 94, 0.12);
  --x: #2563eb;
  --o: #db2777;
  --sq: #eef0f5;
  --sq-hover: #e2e6ef;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 6px 20px rgba(16, 24, 40, 0.06);
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre, .mono { font-family: var(--mono); font-size: 12.5px; }
h1 { font-size: 24px; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: 16px; margin: 0 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 14px; margin: 0 0 8px; }
p { margin: 0 0 10px; }
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.small { font-size: 12px; }
.nowrap { white-space: nowrap; }

/* ---------- layout ---------- */
.shell { display: grid; grid-template-columns: 236px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; padding: 20px 14px;
  background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 4px;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 18px; font-weight: 700; font-size: 16px; letter-spacing: -0.02em; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--cyan)); color: #fff; font-family: var(--mono); font-size: 13px; font-weight: 700;
}
.brand small { display: block; font-weight: 500; font-size: 11px; color: var(--muted); letter-spacing: 0; }
.nav a {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 9px;
  color: var(--muted); font-weight: 500; text-decoration: none;
}
.nav a:hover { background: var(--panel-2); color: var(--text); }
.nav a.active { background: var(--accent-soft); color: var(--text); }
.nav a.active svg { color: var(--accent); }
.nav svg { width: 18px; height: 18px; flex: none; }
.sidebar-foot { margin-top: auto; display: flex; flex-direction: column; gap: 8px; }
.run-pill { display: none; padding: 10px; border-radius: 10px; background: var(--panel-2); border: 1px solid var(--border); font-size: 12px; }
.run-pill.on { display: block; }
.topbar { display: none; }
main { padding: 28px 32px 64px; min-width: 0; }
.page { max-width: 1240px; margin: 0 auto; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.page-head p { margin: 4px 0 0; color: var(--muted); }

/* ---------- primitives ---------- */
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); min-width: 0; }
.card.flush { padding: 0; overflow: hidden; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.card-head h2 { margin: 0; }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.split { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.stack { display: flex; flex-direction: column; gap: 16px; }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.spacer { flex: 1; }

.stat .label { color: var(--muted); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }
.stat .value { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; margin-top: 6px; display: flex; align-items: center; gap: 10px; }
.stat .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 36px; padding: 0 14px;
  border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { background: var(--panel-3); text-decoration: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: transparent; color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--bad); }
.btn.sm { height: 30px; padding: 0 10px; font-size: 12.5px; border-radius: 8px; }
.btn.icon { width: 36px; padding: 0; }
.btn svg { width: 16px; height: 16px; }

label.field { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--muted); font-weight: 500; }
input, select, textarea {
  font: inherit; color: var(--text); background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 8px 10px; min-height: 36px; outline: none; min-width: 0;
}
textarea { font-family: var(--mono); font-size: 12px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.chip {
  display: inline-flex; align-items: center; gap: 6px; height: 28px; padding: 0 10px; border-radius: 999px;
  border: 1px solid var(--border); background: transparent; color: var(--muted); font: inherit; font-size: 12px; font-weight: 600; cursor: pointer;
}
.chip:hover { color: var(--text); }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: var(--text); }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 18px; overflow-x: auto; }
.tabs button {
  background: none; border: 0; border-bottom: 2px solid transparent; color: var(--muted); font: inherit; font-weight: 600;
  padding: 10px 12px; cursor: pointer; white-space: nowrap;
}
.tabs button.on { color: var(--text); border-bottom-color: var(--accent); }

.tag { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border-radius: 6px; font-size: 11.5px; font-weight: 600; background: var(--panel-3); color: var(--muted); white-space: nowrap; }
.tag.good { background: var(--good-soft); color: var(--good); }
.tag.bad { background: var(--bad-soft); color: var(--bad); }
.tag.warn { background: rgba(245, 158, 11, 0.15); color: var(--warn); }
.tag.accent { background: var(--accent-soft); color: var(--accent); }

.grade {
  display: inline-grid; place-items: center; min-width: 38px; height: 30px; padding: 0 8px; border-radius: 8px;
  font-weight: 800; font-size: 14px; letter-spacing: -0.02em; color: #0b0d12;
}
.grade.lg { min-width: 72px; height: 64px; font-size: 32px; border-radius: 14px; }
.grade[data-g='S+'] { background: linear-gradient(135deg, #fde68a, #f472b6 60%, #a78bfa); }
.grade[data-g='S'] { background: linear-gradient(135deg, #fde68a, #fbbf24); }
.grade[data-g='A'] { background: #4ade80; }
.grade[data-g='B'] { background: #2dd4bf; }
.grade[data-g='C'] { background: #60a5fa; }
.grade[data-g='D'] { background: #fb923c; }
.grade[data-g='F'] { background: #f87171; }

.bar { height: 8px; border-radius: 99px; background: var(--panel-3); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--accent), var(--cyan)); }
.bar.good > i { background: var(--good); }
.bar.lg { height: 12px; }
.meter { display: grid; grid-template-columns: 130px 1fr 64px; align-items: center; gap: 12px; padding: 7px 0; }
.meter .k { color: var(--muted); font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.meter .v { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }

table.t { width: 100%; border-collapse: collapse; }
.t th { text-align: left; font-size: 11.5px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); padding: 10px 14px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.t td { padding: 11px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.t tr:last-child td { border-bottom: 0; }
.t tbody tr:hover td { background: var(--panel-2); }
.t .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.table-wrap { overflow-x: auto; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--muted); }
.empty-state h3 { color: var(--text); font-size: 16px; }
.notice { padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--panel-2); }
.notice.error { border-color: rgba(244, 63, 94, 0.4); background: var(--bad-soft); color: var(--text); }
.spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid var(--border); border-top-color: var(--accent); animation: spin 0.8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.skeleton { background: linear-gradient(90deg, var(--panel-2), var(--panel-3), var(--panel-2)); background-size: 200% 100%; animation: shimmer 1.2s infinite; border-radius: 10px; min-height: 16px; }
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
.toast-host { position: fixed; right: 18px; bottom: 18px; display: flex; flex-direction: column; gap: 8px; z-index: 50; }
.toast { padding: 11px 14px; border-radius: 10px; background: var(--panel-3); border: 1px solid var(--border); box-shadow: var(--shadow); max-width: 360px; animation: pop 0.18s ease-out; }
.toast.error { border-color: rgba(244, 63, 94, 0.5); }
@keyframes pop { from { transform: translateY(6px); opacity: 0; } }

/* ---------- boards ---------- */
.board {
  display: grid; gap: 4px; aspect-ratio: 1; width: 100%;
  padding: 6px; border-radius: 12px; background: var(--panel-3); user-select: none;
}
.board[data-n='5'] { gap: 3px; }
.board[data-n='10'] { gap: 2px; padding: 4px; }
.sq { position: relative; background: var(--sq); border-radius: 7px; display: grid; place-items: center; min-width: 0; min-height: 0; overflow: hidden; }
.board[data-n='10'] .sq { border-radius: 3px; }
.board.interactive .sq.empty { cursor: pointer; }
.board.interactive .sq.empty:hover { background: var(--sq-hover); }
.sq svg { width: 72%; height: 72%; }
.sq.X svg { color: var(--x); }
.sq.O svg { color: var(--o); }
.sq.correct::after { content: ''; position: absolute; width: 22%; height: 22%; border-radius: 50%; background: var(--good); opacity: 0.55; }
.sq.pick { box-shadow: inset 0 0 0 3px var(--accent); }
.sq.pick.pass { box-shadow: inset 0 0 0 3px var(--good); background: var(--good-soft); }
.sq.pick.fail { box-shadow: inset 0 0 0 3px var(--bad); background: var(--bad-soft); }
.board[data-n='10'] .sq.pick { box-shadow: inset 0 0 0 2px var(--accent); }
.board[data-n='10'] .sq.pick.pass { box-shadow: inset 0 0 0 2px var(--good); }
.board[data-n='10'] .sq.pick.fail { box-shadow: inset 0 0 0 2px var(--bad); }
.sq.last { background: var(--accent-soft); }
.sq.win { background: var(--good-soft); }
.sq.ghost svg { opacity: 0.35; }
.sq.thinking { animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { background: var(--accent-soft); } }
.board-wrap { max-width: 520px; margin: 0 auto; width: 100%; }
.coords { display: flex; justify-content: space-between; color: var(--faint); font-size: 11px; font-family: var(--mono); padding: 0 8px; }

.test-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.test-card { background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 10px; cursor: pointer; display: flex; flex-direction: column; gap: 8px; text-align: left; color: inherit; font: inherit; }
.test-card:hover { border-color: var(--accent); }
.test-card .meta { display: flex; justify-content: space-between; align-items: center; gap: 6px; font-size: 11.5px; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 12px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 12px; height: 12px; border-radius: 4px; display: inline-block; }

.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; font-size: 13px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-variant-numeric: tabular-nums; min-width: 0; overflow-wrap: anywhere; }
.log { max-height: 340px; overflow: auto; display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; }
.log .entry { display: flex; justify-content: space-between; gap: 10px; padding: 6px 8px; border-radius: 8px; background: var(--panel-2); }
pre.io { background: var(--panel-2); border: 1px solid var(--border); padding: 10px 12px; border-radius: 10px; margin: 0; overflow: auto; max-height: 260px; }

dialog { border: 1px solid var(--border); background: var(--panel); color: var(--text); border-radius: 16px; padding: 0; width: min(760px, calc(100vw - 32px)); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(0, 0, 0, 0.55); }
.dlg-head { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.dlg-body { padding: 18px; max-height: calc(100vh - 160px); overflow: auto; }

.progress-big { display: flex; align-items: center; gap: 16px; }
.progress-big .pct { font-size: 32px; font-weight: 800; font-variant-numeric: tabular-nums; min-width: 92px; }
.live-feed { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; }
.live-feed .test-card { padding: 6px; gap: 4px; cursor: default; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; z-index: 40; left: 0; top: 0; width: 260px; transform: translateX(-100%); transition: transform 0.2s ease; box-shadow: var(--shadow); }
  .sidebar.open { transform: none; }
  .topbar { display: flex; align-items: center; gap: 12px; position: sticky; top: 0; z-index: 30; padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--border); }
  main { padding: 18px 16px 48px; }
  .g2, .g3 { grid-template-columns: 1fr; }
  .meter { grid-template-columns: 96px 1fr 56px; }
  .t th, .t td { padding: 9px 10px; }
  .hide-sm { display: none; }
}
@media (max-width: 480px) { .g4 { grid-template-columns: 1fr 1fr; } .stat .value { font-size: 20px; } }

/* tier list */
.tier-list { display: flex; flex-direction: column; gap: 10px; }
.tier-row { display: grid; grid-template-columns: 72px 1fr; gap: 14px; align-items: center; min-height: 64px; }
.tier-row + .tier-row { border-top: 1px solid var(--border); padding-top: 10px; }
.tier-items { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.tier-chip { display: inline-flex; gap: 10px; align-items: center; padding: 10px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--panel-2, var(--panel)); color: var(--text); text-decoration: none; }
.tier-chip:hover { border-color: var(--accent); }
.grade[data-g='?'] { background: var(--panel-3); color: var(--muted); }
@media (max-width: 640px) { .tier-row { grid-template-columns: 56px 1fr; } .tier-row .grade.lg { min-width: 56px; height: 52px; font-size: 24px; } }