:root {
  --bg: #0f1419;
  --panel: #1a2230;
  --panel-2: #232d3d;
  --ink: #e8edf4;
  --muted: #9fb0c3;
  --accent: #f6a821;      /* whistle gold */
  --accent-2: #3b82f6;
  --good: #34d399;
  --bad: #f87171;
  --line: #2c3850;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 18px 16px 60px; }

header { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.title { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.authbar { display: flex; align-items: center; gap: 8px; }
.authbar .who { color: var(--muted); font-size: .8rem; max-width: 170px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.authbtn { background: var(--panel-2); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; font-size: .85rem; font-weight: 600; cursor: pointer; flex: 0 0 auto; }
.authbtn:hover { border-color: var(--accent); }
.suggest-row { margin-top: 12px; }
.suggest-row .linklike { font-size: .85rem; }

/* correction modal */
.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: flex; align-items: center; justify-content: center; padding: 18px; z-index: 50; }
.modal { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px 18px 16px; width: 100%; max-width: 480px; max-height: 90vh; overflow: auto; }
.modal h3 { margin: 0 0 8px; }
.modal .s-q { font-size: .85rem; margin: 0 0 8px; }
.modal label { display: block; font-size: .82rem; color: var(--muted); margin: 12px 0 5px; }
.modal .req { color: var(--bad); }
.modal textarea, .modal input { width: 100%; box-sizing: border-box; background: var(--panel-2); color: var(--ink); border: 1px solid var(--line); border-radius: 9px; padding: 9px 11px; font: inherit; }
.modal textarea { resize: vertical; }
.modal-actions { display: flex; gap: 10px; margin-top: 16px; }
.s-msg { font-size: .85rem; margin-top: 10px; min-height: 1.1em; color: var(--muted); }
.s-msg.bad { color: var(--bad); }
.s-msg.good { color: var(--good); }
header h1 { font-size: 1.35rem; margin: 0; letter-spacing: .2px; }
header h1 .ball { color: var(--accent); }
header .sub { color: var(--muted); font-size: .85rem; }

.banner { background: var(--panel); border: 1px solid var(--line); border-left: 3px solid var(--accent);
  border-radius: 12px; padding: 11px 15px; margin: 0 0 14px; }
.banner h2 { margin: 0 0 3px; font-size: 1.02rem; }
.banner p { margin: 0; color: var(--muted); font-size: .85rem; line-height: 1.5; }

.tabs { display: flex; gap: 8px; margin: 16px 0 14px; }
.tab {
  flex: 1; padding: 11px 12px; text-align: center; cursor: pointer;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  color: var(--muted); font-weight: 600; user-select: none;
}
.tab.active { background: var(--panel-2); color: var(--ink); border-color: var(--accent); }

.controls { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; margin-bottom: 14px; }
.controls .row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.controls .label { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .6px; width: 100%; margin: 8px 0 2px; }
.chip {
  padding: 6px 11px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--panel-2); color: var(--muted); cursor: pointer; font-size: .85rem; user-select: none;
}
.chip.on { background: rgba(246,168,33,.15); border-color: var(--accent); color: var(--ink); }
.chip.diff.on { background: rgba(59,130,246,.18); border-color: var(--accent-2); }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.badge { font-size: .72rem; padding: 3px 9px; border-radius: 999px; background: var(--panel-2); color: var(--muted); border: 1px solid var(--line); }
.badge.Easy { color: var(--good); }
.badge.Medium { color: var(--accent); }
.badge.Hard { color: var(--bad); }
.q { font-size: 1.08rem; margin: 2px 0 6px; }
.prompt-label { color: var(--muted); font-size: .74rem; text-transform: uppercase; letter-spacing: .6px; }

.answer { margin-top: 14px; border-top: 1px dashed var(--line); padding-top: 14px; display: none; }
.answer.show { display: block; }
.answer h3 { margin: 0 0 6px; font-size: .8rem; text-transform: uppercase; letter-spacing: .6px; color: var(--accent); }
.answer .ruling { font-weight: 500; }
.answer .context { margin-top: 12px; color: var(--muted); font-size: .9rem; background: var(--panel-2); border-radius: 8px; padding: 9px 12px; line-height: 1.55; }
.answer .context b { color: var(--ink); }
.answer .cite { margin-top: 12px; font-size: .82rem; color: var(--muted); }
.answer .cite b { color: var(--ink); }
.answer .trap { margin-top: 8px; font-size: .9rem; color: var(--ink); background: rgba(248,113,113,.08); border-left: 3px solid var(--bad); padding: 8px 10px; border-radius: 6px; }

.actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
button {
  font: inherit; font-weight: 700; cursor: pointer; border: none; border-radius: 11px;
  padding: 12px 16px; color: #0f1419; background: var(--accent); flex: 1; min-width: 120px;
}
button.secondary { background: var(--panel-2); color: var(--ink); border: 1px solid var(--line); }
button.good { background: var(--good); }
button.bad { background: var(--bad); color: #fff; }
button:active { transform: translateY(1px); }

.score { display: flex; gap: 16px; justify-content: center; margin-top: 18px; color: var(--muted); font-size: .9rem; flex-wrap: wrap; align-items: center; }
.score b { color: var(--ink); }
.score a { color: var(--muted); text-decoration: underline; cursor: pointer; font-size: .8rem; }

.footer { text-align: center; color: var(--muted); font-size: .75rem; margin-top: 26px; line-height: 1.7; }
.footer code { background: var(--panel); padding: 1px 6px; border-radius: 5px; }
.hidden { display: none !important; }

/* tab pill (review count) */
.pill { display: inline-block; min-width: 18px; padding: 0 6px; margin-left: 4px; border-radius: 999px;
  background: var(--bad); color: #fff; font-size: .72rem; line-height: 18px; text-align: center; vertical-align: middle; }
.pill.zero { background: var(--line); color: var(--muted); }

/* search input */
.search { width: 100%; padding: 11px 13px; border-radius: 11px; border: 1px solid var(--line);
  background: var(--panel-2); color: var(--ink); font: inherit; }
.search::placeholder { color: var(--muted); }

/* browse layout */
.browse { display: grid; grid-template-columns: 260px 1fr; gap: 14px; }
@media (max-width: 680px) { .browse { grid-template-columns: 1fr; } }
.seclist { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 8px; max-height: 70vh; overflow: auto; }
.secrow { padding: 9px 11px; border-radius: 9px; cursor: pointer; color: var(--muted); font-size: .9rem; }
.secrow:hover { background: var(--panel-2); color: var(--ink); }
.secrow.active { background: rgba(246,168,33,.15); color: var(--ink); border-left: 3px solid var(--accent); }
.secrow .hit { color: var(--accent); font-size: .76rem; margin-left: 6px; }
.seclist .none { color: var(--muted); padding: 10px; font-size: .88rem; }
.reading { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; max-height: 70vh; overflow: auto; }
.reading h2 { margin: 0 0 12px; font-size: 1.05rem; color: var(--accent); position: sticky; top: -18px;
  background: var(--panel); padding: 6px 0; }
.reading .body { font-size: .93rem; line-height: 1.62; }
.reading .body p { margin: 0 0 11px; }
.reading .placeholder { color: var(--muted); }
.reading mark { background: var(--accent); color: #0f1419; border-radius: 3px; padding: 0 2px; }
.b-head { margin: 20px 0 8px; font-size: .95rem; font-weight: 700; color: var(--accent); letter-spacing: .2px; }
.b-head:first-child { margin-top: 0; }
.b-sub { margin: 16px 0 6px; font-size: .92rem; font-weight: 700; color: var(--ink); }
.b-art strong, .b-ar strong { color: var(--ink); }
.b-cite { color: var(--muted); font-size: .85rem; margin: 2px 0 13px; }
.b-ruling { background: rgba(52,211,153,.08); border-left: 3px solid var(--good); padding: 9px 11px; border-radius: 6px; margin: 4px 0 12px; }
.b-ruling strong { color: var(--good); }
.b-penalty { background: rgba(246,168,33,.08); border-left: 3px solid var(--accent); padding: 9px 11px; border-radius: 6px; margin: 4px 0 12px; }
.b-penalty strong { color: var(--accent); }
.b-li1 { margin: 10px 0 4px; padding-left: 2px; }
.b-li1 strong { color: var(--accent); }
.b-li2 { margin: 5px 0 5px 20px; }
.b-li2 strong { color: var(--ink); }
.b-li3 { margin: 4px 0 4px 40px; }
.b-li3 strong { color: var(--muted); }
.b-graphic { color: var(--accent); font-weight: 600; white-space: nowrap; }

/* diagrams */
.diagrams { margin: 0 0 16px; border-bottom: 1px dashed var(--line); padding-bottom: 14px; }
.diagrams h3 { font-size: .8rem; text-transform: uppercase; letter-spacing: .6px; color: var(--accent); margin: 0 0 10px; }
.diagrams .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.diagrams a { display: block; background: #fff; border-radius: 8px; padding: 6px; border: 1px solid var(--line); }
.diagrams img { width: 100%; height: auto; display: block; border-radius: 4px; }
.diagrams.more { border-bottom: none; border-top: 1px dashed var(--line); padding-top: 14px; padding-bottom: 0; margin: 16px 0 0; }

/* inline figure placed next to its "(Graphic N)" reference */
.fig { margin: 10px 0 14px; }
.fig a { display: inline-block; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 6px; max-width: 100%; }
.fig img { display: block; width: 100%; max-width: 400px; height: auto; border-radius: 4px; }
.fig.multi { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.fig.multi a { display: block; }
.fig.multi img { max-width: 100%; }

/* review */
.linklike { color: var(--muted); text-decoration: underline; cursor: pointer; font-size: .82rem; }
.muted { color: var(--muted); }
.review-item { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 10px; }
.review-item .q { font-size: 1rem; margin: 6px 0; }
.review-item .answer { display: block; border-top: 1px dashed var(--line); margin-top: 10px; padding-top: 10px; }
.review-item .ri-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.review-item .ri-actions button { flex: 0 1 auto; padding: 8px 13px; font-size: .85rem; }