:root {
  --paper: #f4efe6;
  --paper-2: #ebe4d6;
  --card: #fbf8f2;
  --ink: #1f1b16;
  --ink-2: #5a5249;
  --ink-3: #8a8177;
  --line: #d9d0c0;
  --seal: #b8321f;
  --seal-soft: #f3ddd5;
  --ok: #2f6b4f;
  --ok-soft: #dcebe2;
  --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.75 var(--sans);
  letter-spacing: .01em;
}
.wrap { width: min(880px, 100% - 40px); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--ink); color: var(--paper); padding: 8px 14px; border-radius: 8px; z-index: 10; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--seal); outline-offset: 3px; }

/* masthead */
.masthead { padding: 72px 0 40px; border-bottom: 1px solid var(--line); }
.kicker { margin: 0 0 12px; color: var(--seal); font-size: 14px; font-weight: 600; letter-spacing: .18em; }
h1 {
  margin: 0;
  font: 900 clamp(44px, 9vw, 84px)/1.05 var(--serif);
  letter-spacing: .02em;
}
.motion { margin: 22px 0 0; max-width: 34em; color: var(--ink-2); font-size: 18px; }
.motion strong { color: var(--ink); font-weight: 600; }

/* rules */
.rules { padding: 40px 0 44px; }
.section-label { margin: 0 0 20px; font-size: 14px; font-weight: 600; letter-spacing: .14em; color: var(--ink-3); }
.rule-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.rule-grid li { background: var(--card); padding: 20px 22px; display: flex; gap: 14px; }
.rule-grid p { margin: 0; color: var(--ink-2); }
.rule-grid b { color: var(--ink); font-weight: 600; }
.rule-no { font: 900 15px/1.9 var(--serif); color: var(--seal); }
.formula { margin: 18px 0 0; padding: 14px 18px; border-radius: var(--radius); background: var(--ink); color: var(--paper); font-weight: 600; }
.formula span { display: inline-block; margin-right: 12px; padding: 1px 8px; border: 1px solid #ffffff55; border-radius: 6px; font-size: 13px; font-weight: 500; letter-spacing: .1em; }

/* toolbar */
.toolbar { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-block: 1px solid var(--line); }
.toolbar-inner { display: flex; gap: 12px; align-items: center; padding-top: 12px; }
.mode-switch { display: flex; padding: 3px; background: var(--paper-2); border-radius: 999px; flex: none; }
.mode-switch button { border: 0; background: none; padding: 6px 16px; border-radius: 999px; cursor: pointer; font-size: 15px; color: var(--ink-2); }
.mode-switch button[aria-selected="true"] { background: var(--card); color: var(--ink); font-weight: 600; box-shadow: 0 1px 2px #0000001a; }
.search { flex: 1; }
.search input { width: 100%; padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); font-size: 16px; }
.chips { display: flex; gap: 8px; overflow-x: auto; padding: 10px 0 12px; scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip { flex: none; border: 1px solid var(--line); background: var(--card); padding: 4px 14px; border-radius: 999px; cursor: pointer; font-size: 14px; color: var(--ink-2); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.chip.hard[aria-pressed="true"] { background: var(--seal); border-color: var(--seal); }
.chip small { opacity: .6; margin-left: 4px; }

/* list */
main { padding: 24px 0 40px; }
.count { margin: 0 0 14px; color: var(--ink-3); font-size: 14px; }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.item[open] { border-color: var(--ink-3); }
.item summary { list-style: none; cursor: pointer; padding: 18px 20px; display: grid; grid-template-columns: auto 1fr auto; gap: 4px 14px; align-items: baseline; }
.item summary::-webkit-details-marker { display: none; }
.num { font: 900 22px/1 var(--serif); color: var(--ink-3); min-width: 1.6em; }
.item[open] .num { color: var(--seal); }
.ttl { font-weight: 600; font-size: 18px; line-height: 1.5; }
.meta { grid-column: 2; display: flex; gap: 10px; flex-wrap: wrap; font-size: 13px; color: var(--ink-3); }
.lvl { grid-row: 1; grid-column: 3; font-size: 12px; white-space: nowrap; color: var(--ink-3); }
.lvl.l3 { color: var(--seal); font-weight: 600; }
.known-tag { color: var(--ok); }

.body { padding: 0 20px 22px; border-top: 1px dashed var(--line); margin: 0 20px; padding-inline: 0; }
.attack { margin: 20px 0 0; padding: 16px 18px; background: var(--seal-soft); border-radius: 10px; font: 600 18px/1.7 var(--serif); }
.attack::before { content: "反方："; color: var(--seal); }
.trap { margin: 10px 2px 0; color: var(--ink-2); font-size: 15px; }
.trap b { color: var(--seal); font-weight: 600; }
.block { margin-top: 22px; }
.label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; letter-spacing: .12em; color: var(--ink-3); }
.answer { margin: 0; padding: 16px 18px; border-left: 4px solid var(--ink); background: var(--paper); border-radius: 0 10px 10px 0; font-size: 18px; }
.principle { margin: 10px 0 0; font-weight: 600; }
.principle::before { content: "記住："; color: var(--seal); }
.bonus { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.bonus li { padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px; }
.bonus b { display: block; font-size: 14px; color: var(--ok); }
.fu { margin: 0; display: grid; gap: 12px; }
.fu dt { font-weight: 600; }
.fu dt::before { content: "追問　"; color: var(--seal); font-size: 13px; }
.fu dd { margin: 2px 0 0; color: var(--ink-2); }
.fu dd::before { content: "回應　"; color: var(--ok); font-size: 13px; font-weight: 600; }
.avoid { margin: 22px 0 0; padding: 12px 16px; border: 1px dashed var(--seal); border-radius: 10px; color: var(--ink-2); font-size: 15px; }
.avoid b { color: var(--seal); }
.empty { padding: 40px 0; text-align: center; color: var(--ink-3); }

/* drill */
.drill-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: var(--ink-3); font-size: 14px; margin-bottom: 14px; }
.drill-opt { display: flex; gap: 6px; align-items: center; cursor: pointer; }
.drill-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 24px; min-height: 260px; }
.drill-card .num-big { font: 900 14px/1 var(--serif); color: var(--seal); letter-spacing: .1em; }
.drill-card h2 { margin: 10px 0 0; font: 900 26px/1.4 var(--serif); }
.drill-card .attack { font-size: 20px; }
.drill-card .reveal { margin-top: 8px; }
.drill-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.btn { padding: 10px 20px; border-radius: 999px; cursor: pointer; font-size: 16px; font-weight: 600; }
.btn.ghost { background: var(--card); border: 1px solid var(--line); }
.btn.solid { background: var(--ink); color: var(--paper); border: 1px solid var(--ink); margin-left: auto; }
.btn:disabled { opacity: .4; cursor: default; }
.drill-hint { color: var(--ink-3); font-size: 14px; }
.done { text-align: center; padding: 30px 0; }
.done h2 { font: 900 28px/1.4 var(--serif); }

.foot { padding: 30px 0 60px; border-top: 1px solid var(--line); color: var(--ink-3); font-size: 14px; }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .masthead { padding: 48px 0 28px; }
  .rule-grid { grid-template-columns: 1fr; }
  .toolbar-inner { flex-direction: column; align-items: stretch; }
  .mode-switch { align-self: flex-start; }
  .item summary { padding: 16px; }
  .body { margin: 0 16px; }
  .answer, .attack { font-size: 17px; }
  .btn.solid { margin-left: 0; flex: 1 0 100%; }
}
@media (prefers-reduced-motion: no-preference) {
  .item[open] .body { animation: rise .22s ease-out; }
  @keyframes rise { from { opacity: 0; transform: translateY(-4px); } }
}

/* moves */
.moves { padding: 0 0 44px; }
.move-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.move-card { width: 100%; height: 100%; text-align: left; display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.move-card b { font: 900 17px/1.4 var(--serif); }
.move-card span { color: var(--ink-2); font-size: 14px; line-height: 1.6; flex: 1; }
.move-card small { color: var(--ink-3); font-size: 12px; }
.move-card:hover { border-color: var(--ink-3); }
.move-card[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); }
.move-card[aria-pressed="true"] b, .move-card[aria-pressed="true"] span, .move-card[aria-pressed="true"] small { color: var(--paper); }
.move-tag { margin: 8px 0 0; font-size: 14px; color: var(--ink-3); }
.move-link, .move-clear { border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 1px 10px; cursor: pointer; font-size: 13px; color: var(--ink); }
.variants { margin: 0; padding-left: 1.2em; color: var(--ink-2); }
@media (max-width: 640px) { .move-grid { grid-template-columns: 1fr 1fr; } }