:root {
  --ink: #1d2433;
  --ink-soft: #5a6274;
  --bg: #eef0f5;
  --paper: #ffffff;
  --line: #d5dae6;
  --primary: #2b4a9a;
  --primary-dark: #1b2f68;
  --board: #22305a;
  --chalk: #fbf8ee;
  --accent: #ff9f1c;
  --ok: #1f8a4c;
  --ng: #c23b2e;
  --gold: #f2c14e;
  --font: "Zen Kaku Gothic New", system-ui, sans-serif;
  --num: "Martian Mono", ui-monospace, "Zen Kaku Gothic New", monospace;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-weight: 500; line-height: 1.7; line-break: strict; }
.hidden { display: none !important; }
.nw { white-space: nowrap; }

.g-head { display: flex; align-items: center; gap: 10px; padding: 10px 16px; max-width: 520px; margin: 0 auto; font-size: 13px; font-weight: 900; }
.g-brand { color: var(--ink-soft); text-decoration: none; white-space: nowrap; }
.g-title { flex: 1; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.g-head [data-mg-account] a { color: var(--primary-dark); text-decoration: none; }

main { max-width: 520px; margin: 0 auto; padding: 0 12px 24px; }
.play { position: relative; user-select: none; -webkit-user-select: none; }

/* 残り時間・正解・ミス */
.bar { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 8px; }
.box { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 4px 8px; text-align: center; min-width: 0; }
.lbl { font-size: 12px; font-weight: 900; color: var(--ink-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.val { font: 700 26px/1.2 var(--num); font-variant-numeric: tabular-nums; white-space: nowrap; }
.val small { font: 900 14px/1 var(--font); color: var(--ink-soft); margin-left: 2px; }
.time-box.low .val { color: var(--ng); }
.meter { height: 8px; margin: 8px 0 10px; border-radius: 99px; background: var(--line); overflow: hidden; }
.meter i { display: block; height: 100%; width: 100%; background: var(--accent); border-radius: 99px; transform-origin: left center; }

/* 問題の黒板 */
.card-q { position: relative; background: var(--board); color: var(--chalk); border-radius: 18px; padding: 10px 14px 12px; box-shadow: 0 10px 28px rgba(34, 48, 90, 0.25); text-align: center; border: 3px solid transparent; }
.q-head { display: flex; justify-content: space-between; font-size: 13px; font-weight: 900; color: #b8c3e3; }
.q { font: 700 min(46px, 11.5vw)/1.25 var(--num); letter-spacing: 0.02em; white-space: nowrap; margin-top: 4px; min-height: 1.25em; }
.ans-row { display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 6px; }
.eq { font: 700 min(40px, 10vw)/1 var(--num); color: #b8c3e3; }
.ans { display: inline-grid; place-items: center; min-width: 4.2ch; height: 1.4em; padding: 0 10px; border-radius: 12px; background: var(--chalk); color: var(--primary-dark); font: 700 min(44px, 11vw)/1 var(--num); box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.12); }
.ans:empty::before { content: "?"; color: #b9bfcc; }
.fb { min-height: 30px; margin-top: 6px; font-size: 17px; font-weight: 900; display: flex; align-items: center; justify-content: center; gap: 6px; }
.fb svg { flex: none; }
.fb.ok { color: #7ee2a6; }
.fb.ng { color: #ffb0a6; }
.fb.skip { color: var(--accent); }
.card-q.ok { border-color: #7ee2a6; }
.card-q.ng { border-color: #ffb0a6; animation: shake 0.3s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@media (prefers-reduced-motion: reduce) { .card-q.ng { animation: none; } }
.count { position: absolute; inset: 0; display: grid; place-items: center; border-radius: 15px; background: var(--board); font: 700 88px/1 var(--num); color: var(--accent); }

/* 数字のボタン（電卓と同じ並び） */
.pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 10px; touch-action: manipulation; }
.key { height: 58px; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); color: var(--ink); font: 700 28px/1 var(--num); cursor: pointer; padding: 0; display: flex; align-items: center; justify-content: center; gap: 4px; box-shadow: 0 3px 0 var(--line); }
.key:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.key:disabled { opacity: 0.35; cursor: default; }
.key.fn { color: var(--ink-soft); font: 900 16px/1 var(--font); }
.key.go { background: var(--primary); border-color: var(--primary); color: #fff; font: 900 18px/1 var(--font); box-shadow: 0 3px 0 var(--primary-dark); }

.tools { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 10px; }
.kbd { margin: 0; font-size: 13px; font-weight: 700; color: var(--ink-soft); }
.tool { flex: none; display: inline-flex; align-items: center; gap: 4px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); color: var(--ink); font: 900 13px/1 var(--font); cursor: pointer; white-space: nowrap; }

/* タイトル・結果（問題を隠して全体を見せる） */
.play.menu .bar, .play.menu .meter, .play.menu .card-q, .play.menu .pad, .play.menu .tools { display: none; }
.card-ui { width: 100%; max-width: 420px; margin: 0 auto; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 20px 16px 16px; text-align: center; box-shadow: 0 10px 30px rgba(29, 36, 51, 0.1); }
.logo { margin: 0; font: 900 clamp(22px, 7.4vw, 30px)/1.3 var(--font); letter-spacing: 0.03em; }
.logo span { display: inline-block; white-space: nowrap; }
.day { margin: 2px 0 12px; font-size: 13px; color: var(--ink-soft); font-weight: 900; }
.daily-box { border: 2px solid var(--primary); border-radius: 16px; padding: 12px; margin-bottom: 10px; }
.daily-lbl { font-size: 12px; font-weight: 900; color: var(--ink-soft); letter-spacing: 0.1em; }
.daily-name { font: 900 24px/1.4 var(--font); color: var(--primary-dark); }
.daily-par { font-size: 13px; font-weight: 900; color: var(--ink-soft); margin-top: 2px; }
.daily-note { margin: 4px 0 8px; font-size: 13px; color: var(--ink-soft); }
.done { font-size: 15px; font-weight: 900; margin-top: 6px; }
.howto { list-style: none; margin: 12px 0 0; padding: 10px 12px; background: var(--bg); border-radius: 12px; text-align: left; font-size: 14px; font-weight: 700; }
.howto li { display: flex; align-items: baseline; gap: 6px; padding: 3px 0; }
.howto .num { flex: none; font-weight: 900; color: var(--primary); }
.ng-t { color: var(--ng); margin: 0 2px; }
.stats { font-size: 13px; color: var(--ink-soft); font-weight: 700; margin: 10px 0 0; }

.btn { display: block; width: 100%; margin: 8px 0; padding: 14px 10px; border: 0; border-radius: 14px; font: 900 17px/1.2 var(--font); cursor: pointer; background: var(--bg); color: var(--ink); }
.btn small { display: block; font-size: 12px; font-weight: 700; color: var(--ink-soft); margin-top: 4px; }
.btn.primary { background: var(--primary); color: #fff; box-shadow: 0 4px 0 var(--primary-dark); }
.btn.primary:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--primary-dark); }
.btn.sub { font-size: 16px; }
.btn.ghost { background: transparent; border: 2px solid var(--line); color: var(--ink-soft); font-size: 15px; }
.btn.x { background: #000; color: #fff; display: flex; align-items: center; justify-content: center; gap: 8px; }
.btn:disabled { opacity: 0.5; cursor: default; }

.clear-lbl { font-size: 13px; font-weight: 900; color: var(--primary-dark); }
.clear-big { margin: 6px 0; }
.clear-big b { font: 700 64px/1 var(--num); font-variant-numeric: tabular-nums; }
.clear-big span { font: 900 20px/1 var(--font); margin-left: 4px; }
.clear-sub { margin: 0; font-size: 15px; font-weight: 700; }
.ops { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin: 12px 0 0; padding: 0; }
.ops li { background: var(--bg); border-radius: 12px; padding: 6px 2px; font-size: 12px; font-weight: 900; color: var(--ink-soft); white-space: nowrap; }
.ops b { display: block; font: 700 22px/1.2 var(--num); color: var(--ink); }
.best { display: block; width: max-content; margin: 10px auto 0; padding: 2px 12px; border-radius: 999px; background: var(--gold); font-weight: 900; font-size: 13px; }
.rank { margin: 12px 0; padding: 8px; background: var(--bg); border-radius: 14px; }
.rank-lbl { font-size: 12px; font-weight: 900; color: var(--ink-soft); }
.rank-name { font: 900 22px/1.4 var(--font); }
.c-note { margin: 8px 0; padding: 8px 10px; border-radius: 12px; background: #fff6dd; font-size: 13px; font-weight: 700; text-align: left; }
.share { margin: 8px 0; }

.toast { position: absolute; left: 50%; top: 30%; transform: translate(-50%, -50%); z-index: 40; max-width: calc(100% - 24px); padding: 10px 18px; border-radius: 16px; background: rgba(29, 36, 51, 0.92); color: #fff; font-weight: 900; font-size: 15px; text-align: center; pointer-events: none; }

/* 下の解説（ポータルと同じ決まり: 行間 1.85・段落の間は1行分・見出しは前を広く後ろを狭く） */
.guide { margin-top: 28px; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 22px 20px 12px; font-size: 15px; line-height: 1.85; }
.guide p { margin: 0 0 1em; }
.guide h2 { font: 900 19px/1.4 var(--font); margin: 32px 0 12px; padding-left: 10px; border-left: 5px solid var(--primary); }
.guide h2:first-child { margin-top: 0; }
.guide h3 { font-size: 16px; margin: 22px 0 6px; line-height: 1.5; }
.guide ul { padding-left: 1.3em; margin: 0 0 1em; }
.guide li { margin: 6px 0; }
.guide .steps { list-style: none; padding: 0; }
.guide .steps li { display: flex; align-items: baseline; gap: 6px; }
.guide .steps .num { flex: none; font-weight: 900; color: var(--primary); }
.guide details { border-top: 1px solid var(--line); padding: 12px 0; }
.guide details p { margin: 8px 0 4px; }
.guide summary { font-weight: 900; cursor: pointer; }
.guide a { color: var(--primary-dark); }
.g-foot { max-width: 520px; margin: 0 auto; padding: 14px 16px 28px; font-size: 12px; text-align: center; }
.g-foot a { color: var(--ink-soft); }

.card-ui .mg-box { background: var(--bg); border-color: transparent; }
@media (max-width: 360px) {
  .key { height: 54px; }
  .val { font-size: 22px; }
  .kbd { font-size: 12px; }
}
@media (max-height: 640px) {
  .key { height: 50px; }
  .fb { min-height: 26px; }
}