/* 紅藍格鬥（扣血對戰，資料夾沿用 tug-of-war）：遊戲專用樣式（色彩 token 沿用 ../../shared/base.css） */

.topbar { background: var(--panel); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
.topbar h1 { margin: 0; font-size: 22px; }
.topbar h1 a { color: inherit; text-decoration: none; }
.small { font-size: 15px; }
.center { text-align: center; justify-content: center; }
.error { color: var(--red); font-weight: 600; }
.ghost { background: transparent; }
a.btn { display: inline-flex; align-items: center; text-decoration: none; }
h2 { margin: 0 0 12px; font-size: 22px; }
.field { display: inline-flex; align-items: center; gap: 8px; }
.field input { width: 96px; }
.warn-box { background: var(--warn-soft); color: var(--ink); border: 1px solid var(--warn); border-radius: 10px; padding: 8px 12px; margin-bottom: 12px; font-size: 15px; }

/* ---------- 隊伍標籤 ---------- */
.team-tag { display: inline-flex; align-items: center; min-height: 32px; padding: 2px 12px; border-radius: 999px; font-weight: 700; color: #fff; white-space: nowrap; }
.team-tag.red { background: var(--red); }
.team-tag.blue { background: var(--blue); }

/* ---------- 格鬥場：角色卡＋血條 ---------- */
.arena { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: stretch; gap: 8px; }
.fighter { position: relative; min-width: 0; display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 8px; border-radius: 12px; border: 2px solid var(--line); background: var(--panel); }
.fighter.red { border-color: var(--red); background: var(--red-soft); }
.fighter.blue { border-color: var(--blue); background: var(--blue-soft); }
.fighter-top { display: flex; justify-content: center; max-width: 100%; }
.fighter-top .team-tag { overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.fighter-icon { font-size: 44px; line-height: 1.1; }
.fighter.blue .fighter-icon { transform: scaleX(-1); } /* 兩個角色面對面 */
.fighter.down .fighter-icon { filter: grayscale(1); opacity: .45; transform: rotate(-80deg); }
.hp-bar { width: 100%; height: 18px; border-radius: 9px; background: var(--line); overflow: hidden; border: 1px solid rgba(0,0,0,.15); }
.hp-bar span { display: block; height: 100%; width: 100%; border-radius: 9px; transition: width .4s ease, background-color .4s ease; }
.hp-bar span.hi { background: var(--ok); }
.hp-bar span.mid { background: #e0a100; }
.hp-bar span.low { background: var(--red); }
.fighter.blue .hp-bar span { margin-left: auto; } /* 藍隊血條從右邊扣 */
.hp-num { font-variant-numeric: tabular-nums; font-size: 15px; white-space: nowrap; }
.hp-num b { font-size: 24px; }
.fighter-info { font-size: 13px; color: var(--muted); text-align: center; overflow-wrap: anywhere; }
.arena-mid { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; min-width: 56px; }
.vs { font-size: 22px; font-weight: 900; color: var(--muted); }
.arena-timer { font-variant-numeric: tabular-nums; font-weight: 800; font-size: 22px; white-space: nowrap; }
.arena-timer.urgent { color: var(--red); animation: pulse 1s infinite; }
.arena-caption { text-align: center; margin: 6px 0 0; font-size: 14px; color: var(--muted); }
.hit-pop { position: absolute; top: 34px; left: 50%; transform: translateX(-50%); font-size: 26px; font-weight: 900; color: var(--red);
  pointer-events: none; opacity: 0; text-shadow: 0 1px 0 #fff; }
.fighter.hit { animation: hitShake .45s ease, hitFlash .45s ease; }
.fighter.hit .hit-pop { animation: popUp .9s ease-out; }
@keyframes hitShake { 15% { transform: translateX(-6px); } 35% { transform: translateX(6px); } 55% { transform: translateX(-4px); } 75% { transform: translateX(3px); } }
@keyframes hitFlash { 0%, 40% { box-shadow: 0 0 0 4px rgba(214, 69, 69, .75); background: #f8b4b4; } }
@keyframes popUp { 0% { opacity: 1; transform: translate(-50%, 0); } 100% { opacity: 0; transform: translate(-50%, -28px); } }
@media (prefers-reduced-motion: reduce) {
  .fighter.hit, .fighter.hit .hit-pop, .arena-timer.urgent, .pulse, .timer.urgent { animation: none; }
  .fighter.hit { box-shadow: 0 0 0 4px rgba(214, 69, 69, .75); }
  .fighter.hit .hit-pop { opacity: 1; }
  .hp-bar span { transition: none; }
}
.arena-panel { padding: 10px; }
.play .arena-panel { position: sticky; top: 0; z-index: 5; }
.waiting .arena-panel { margin: 12px 0; text-align: left; }

/* ---------- 首頁、身分 ---------- */
.home, .identity, .waiting, .result { max-width: 720px; margin: 16px auto; }
.home-links { margin-top: 16px; }
.identity input { flex: 1 1 240px; }
.identity > input { width: 100%; margin-bottom: 12px; }
.diff-row { margin-bottom: 12px; }
.diff { display: flex; flex-direction: column; align-items: center; flex: 1 1 120px; }
.diff small { font-weight: 400; color: var(--muted); font-size: 13px; }
.diff.on { border: 2px solid var(--accent); background: var(--blue-soft); }
.big-btn { width: 100%; min-height: 56px; font-size: 20px; }

/* ---------- 等待 ---------- */
.waiting { text-align: center; }
.team-big { display: inline-block; font-size: 32px; font-weight: 800; color: #fff; padding: 12px 32px; border-radius: 16px; margin: 8px 0; }
.team-big.red { background: var(--red); }
.team-big.blue { background: var(--blue); }
.pulse { font-weight: 700; animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .4; } }
.stats-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin: 12px 0; }
.stats-row > div { display: flex; flex-direction: column; align-items: center; min-width: 88px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 12px; }
.stats-row b { font-size: 26px; }
.stats-row span { font-size: 14px; color: var(--muted); }

/* ---------- 作答工作區 ---------- */
.play { display: flex; flex-direction: column; gap: 12px; max-width: 900px; margin: 0 auto; }
.hud { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 8px 12px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.hud-stat { color: var(--muted); }
.hud-stat b { color: var(--ink); }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; margin-left: auto; }
.timer.big { font-size: 26px; }
.timer.urgent { color: var(--red); animation: pulse 1s infinite; }
.qcard { padding: 16px 18px; }
.q-meta { display: flex; gap: 12px; flex-wrap: wrap; font-size: 14px; color: var(--muted); margin-bottom: 4px; }
.retry-tag { color: var(--warn); font-weight: 700; }
.stem { font-size: 24px; line-height: 1.6; margin: 4px 0 14px; }
.stem sup, .opt sup, .order-item sup, .feedback sup { font-size: .7em; }
.last-answer { margin: 0 0 8px; font-size: 14px; color: var(--muted); }
.answer-area.locked { pointer-events: none; opacity: .75; }
.options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.opt { min-height: 64px; font-size: 20px; font-weight: 600; text-align: left; padding: 10px 16px; }
.opt.picked-ok { background: var(--ok-soft); border-color: var(--ok); }
.opt.picked-bad { background: var(--red-soft); border-color: var(--red); }
.opt:disabled { text-decoration: line-through; }
.input-row { display: flex; gap: 10px; }
.input-row input { flex: 1; font-size: 24px; min-height: 56px; }
.keypad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 10px; max-width: 420px; }
.keypad button { min-height: 52px; font-size: 22px; }
.keypad .wide { grid-column: span 2; font-size: 18px; }
.order-slots { margin: 0 0 10px; padding-left: 28px; display: flex; flex-direction: column; gap: 6px; min-height: 56px; }
.order-slots .placeholder { color: var(--muted); list-style: none; margin-left: -28px; padding: 12px; border: 2px dashed var(--line); border-radius: 12px; }
.order-pool { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.order-item { width: 100%; text-align: left; font-weight: 500; font-size: 18px; }
.order-item.placed { background: var(--blue-soft); border-color: var(--blue); }

.feedback { margin-top: 14px; padding: 12px 14px; border-radius: 12px; }
.feedback.good { background: var(--ok-soft); border: 1px solid var(--ok); }
.feedback.bad { background: var(--red-soft); border: 1px solid var(--red); }
.feedback .row { margin-top: 10px; }
.cool-bar { height: 6px; background: var(--line); border-radius: 3px; margin-top: 10px; overflow: hidden; }
.cool-bar span { display: block; height: 100%; width: 0; background: var(--warn); }

/* ---------- 結算 ---------- */
.result { text-align: center; }
.result-title { font-size: 34px; margin: 0; }
.result.red .result-title { color: var(--red); }
.result.blue .result-title { color: var(--blue); }
.result-mine { font-size: 20px; font-weight: 700; }
.review { text-align: left; background: var(--warn-soft); border-radius: 12px; padding: 10px 14px; margin: 12px 0; }
.review ul { margin: 4px 0 0; }

/* ---------- 老師端 ---------- */
.teacher-controls { margin-bottom: 16px; }
.teacher-controls .row + .row { margin-top: 10px; }
.room-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 460px), 1fr)); gap: 14px; }
.room-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.room-code { font-size: 30px; font-weight: 800; letter-spacing: .12em; font-variant-numeric: tabular-nums; }
.room-code.big { font-size: 56px; text-align: center; }
.status-pill { font-size: 14px; padding: 4px 10px; border-radius: 999px; background: var(--line); }
.status-pill.playing { background: var(--ok-soft); color: var(--ok); font-weight: 700; }
.status-pill.ended { background: var(--warn-soft); color: var(--warn); }
.room-body { display: flex; gap: 12px; align-items: center; }
.qr-box { flex: 0 0 auto; padding: 4px; min-width: 120px; min-height: 120px; background: #fff; }
.qr-box img { display: block; width: 112px; height: 112px; }
.room-main { flex: 1; min-width: 0; }
.room-main .fighter-icon { font-size: 34px; }
.join-link { display: block; font-size: 12px; color: var(--muted); word-break: break-all; margin: 6px 0; }
.room-actions button { flex: 1 1 auto; }
.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: flex; align-items: center; justify-content: center; z-index: 60; padding: 16px; }
.overlay-box { background: #fff; color: #1f2430; border-radius: 16px; padding: 20px; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.overlay-box img { max-width: 100%; height: auto; }

/* ---------- 窄螢幕（iPad 直向分割畫面、手機） ---------- */
@media (max-width: 640px) {
  .options { grid-template-columns: 1fr; }
  .stem { font-size: 21px; }
  .room-body { flex-direction: column; align-items: stretch; }
  .qr-box { align-self: center; }
  .arena { gap: 4px; }
  .fighter { padding: 6px 4px; }
  .fighter-icon { font-size: 34px; }
  .hp-num b { font-size: 20px; }
  .fighter-info { font-size: 11px; }
  .arena-mid { min-width: 44px; }
  .vs { font-size: 16px; }
  .arena-timer { font-size: 17px; }
  .timer.big { font-size: 22px; }
}
@media print {
  .topbar, .teacher-controls, .room-actions, .room-main { display: none; }
}

/* ---------- 發展式出招：解題板（樣式改寫自 step-board，限定在 .sb 內避免互相影響） ---------- */
.sb .p-figure svg { max-width: 100%; height: auto; }
.sb .board { display: grid; gap: 8px; margin-bottom: 10px; }
.sb .line { display: flex; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 12px; font-size: 22px; }
.sb .line-no { flex: none; width: 28px; height: 28px; border-radius: 50%; display: inline-grid; place-items: center; font-size: 14px; background: var(--bg); color: var(--muted); }
.sb .line-body { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; min-width: 0; }
.sb .done-line { background: var(--ok-soft); }
.sb .current-line { background: var(--blue-soft); outline: 2px solid var(--blue); }
.sb .tok { white-space: nowrap; }
.sb .line-frac > span { display: flex; justify-content: center; padding: 3px 4px; gap: 4px; }
.sb .slot { display: inline-flex; align-items: center; justify-content: center; min-width: 64px; min-height: 52px; padding: 3px; border-radius: 12px;
  border: 2px dashed var(--muted); background: var(--panel); cursor: pointer; touch-action: manipulation; }
.sb .slot.filled { border-style: solid; border-color: var(--blue); padding: 2px; }
.sb .slot.wrong { border-color: var(--red); background: var(--red-soft); border-style: solid; }
.sb .slot.done { cursor: default; border: none; background: transparent; min-width: 0; min-height: 0; padding: 0 2px; font-weight: 700; }
.sb .slot:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.sb .goal { display: grid; gap: 6px; font-size: 19px; }
.sb .scaffold { font-size: 16px; padding: 8px 12px; border-radius: 10px; background: var(--warn-soft); }
.sb .tray { display: flex; flex-wrap: wrap; gap: 10px; padding: 12px; margin: 12px 0; border-radius: 12px; background: var(--bg); min-height: 76px; }
.sb .card { display: inline-flex; align-items: center; justify-content: center; min-width: 60px; min-height: 52px; padding: 6px 12px;
  border: 2px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--ink);
  font: inherit; font-size: 21px; font-weight: 600; box-shadow: 0 2px 0 var(--line); cursor: pointer; touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.sb .card.in-slot { min-width: 56px; min-height: 46px; box-shadow: none; border-color: transparent; background: var(--blue-soft); }
.sb .card.selected { border-color: var(--accent); background: var(--blue-soft); transform: translateY(-3px); box-shadow: 0 4px 0 var(--accent); }
.sb .card.used { opacity: .25; cursor: default; box-shadow: none; border-style: dashed; }
.sb .card .frac, .sb .slot .frac { font-size: .85em; }
.sb .m { display: inline; white-space: nowrap; }
.sb .reveal { outline: 3px solid var(--warn); outline-offset: 2px; }
.sb .hints { margin: 0 0 12px; padding-left: 0; list-style: none; display: grid; gap: 6px; font-size: 16px; }
.sb .hints li { padding: 8px 12px; border-radius: 10px; background: var(--bg); }
.sb .hints:empty { display: none; }
.sb .actions { display: grid; grid-template-columns: 1fr 1fr 1.4fr; gap: 8px; margin-top: 10px; }
.sb .actions button { min-height: 56px; }
.sb .shake { animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.sb .longdiv { display: grid; grid-template-columns: auto repeat(var(--cols), minmax(64px, 1fr)); align-items: center; justify-items: center;
  font-size: 21px; row-gap: 4px; margin-bottom: 8px; overflow-x: auto; }
.sb .ld-colhead { font-size: 13px; color: var(--muted); }
.sb .ld-label { justify-self: end; display: flex; align-items: center; gap: 2px; padding-right: 4px; white-space: nowrap; }
.sb .ld-bracket { font-size: 34px; line-height: 1; font-weight: 300; }
.sb .ld-quot { justify-self: stretch; display: flex; gap: 8px; align-items: center; min-height: 56px; padding: 0 6px; }
.sb .ld-cell { justify-self: stretch; display: flex; justify-content: center; align-items: center; min-height: 56px; }
.sb .ld-dividend { border-top: 3px solid var(--ink); }
.sb .ld-bar { border-top: 2px solid var(--ink); }
.sb .ld-current { background: var(--blue-soft); }
@media (max-width: 520px) {
  .sb .line, .sb .longdiv { font-size: 18px; }
  .sb .card { font-size: 19px; min-width: 52px; }
  .sb .slot { min-width: 56px; }
  .sb .actions { grid-template-columns: 1fr 1fr; }
  .sb .actions [data-check] { grid-column: span 2; }
  .sb .longdiv { grid-template-columns: auto repeat(var(--cols), minmax(48px, 1fr)); }
}
@media (prefers-reduced-motion: reduce) { .sb .shake { animation: none; } }