/* ===== 英語あそび — 漢字まじり英語 ===== */

:root {
  --paper: #f5f1e6;
  --card: #fffdf5;
  --ink: #211f1c;
  --sumi: #565248;
  --faint: #918a7a;
  --line: #d8d0ba;
  --line-soft: #e8e2d0;
  --shu: #a63a22;            /* 朱 */
  --shu-deep: #8c2f1a;
  --marker: #eddfb2;         /* マーカー */
  --serif: "Georgia", "Times New Roman", "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", serif;
  --sans: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
[hidden] { display: none !important; }

::selection { background: var(--marker); }

body {
  font-family: var(--sans);
  background:
    repeating-linear-gradient(90deg, rgba(120, 100, 60, .022) 0 1px, transparent 1px 4px),
    linear-gradient(180deg, #f7f3e9 0%, var(--paper) 140px);
  background-color: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

main, .top, .foot { max-width: 620px; margin: 0 auto; padding: 0 20px; }

a { color: var(--shu); }

/* ---- 頭 ---- */
.top { padding-top: 44px; text-align: center; }

.brand {
  display: inline-block;
  text-decoration: none;
  color: inherit;
}
.brand:hover .hanko { transform: rotate(3deg); }
.brand:hover h1 { color: var(--shu-deep); }
.hanko, .top h1 { transition: transform .2s ease, color .2s ease; }

.hanko {
  display: inline-grid; place-items: center;
  width: 44px; height: 44px;
  background: var(--shu);
  color: #fdf8ec;
  font-family: var(--serif);
  font-size: 26px; font-weight: 600;
  border-radius: 8px;
  transform: rotate(-3deg);
  box-shadow: 0 1px 0 var(--shu-deep), 0 3px 10px rgba(166, 58, 34, .25);
  margin-bottom: 14px;
  user-select: none;
}

.top h1 {
  font-family: var(--serif);
  font-size: 31px;
  font-weight: 600;
  letter-spacing: .38em;
  text-indent: .38em;
}
.tagline {
  margin-top: 8px;
  font-size: 12px;
  color: var(--faint);
  letter-spacing: .18em;
}

.lede {
  margin: 30px 0 26px;
  font-size: 13.5px;
  color: var(--sumi);
  text-align: center;
  line-height: 2;
}

/* ---- レベル ---- */
.levels {
  display: flex; justify-content: center;
  border-bottom: 1px solid var(--line);
  margin-bottom: 30px;
}
.levels button {
  appearance: none; background: none; border: none;
  font-family: var(--sans);
  font-size: 13px; color: var(--faint);
  padding: 8px 16px 11px; cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  letter-spacing: .08em;
  transition: color .15s;
}
.levels button:hover { color: var(--sumi); }
.levels button.on {
  color: var(--ink);
  border-bottom-color: var(--shu);
  font-weight: 600;
}

/* ---- 問題カード（額縁） ---- */
.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 34px 30px 26px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(95, 82, 55, .05), 0 12px 28px rgba(95, 82, 55, .06);
}
.card::before {
  content: "";
  position: absolute; inset: 6px;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  pointer-events: none;
}
.card.open { cursor: default; }

.q-no {
  display: flex; justify-content: center; align-items: center; gap: 14px;
  font-family: var(--serif);
  font-size: 13px; color: var(--shu);
  letter-spacing: .3em; text-indent: .3em;
  margin-bottom: 20px;
}
.q-no::before, .q-no::after {
  content: "";
  width: 34px; height: 1px;
  background: var(--line);
}
.q-src {
  font-family: var(--sans);
  font-size: 10.5px; color: var(--faint);
  letter-spacing: .1em; text-indent: 0;
}

.q-blend {
  font-family: var(--serif);
  font-size: 27px;
  line-height: 2.1;
  font-weight: 500;
  text-align: center;
  word-break: break-word;
  animation: settle .4s ease;
}
@keyframes settle {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* マーカー風の下線ハイライト */
.k {
  background: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 92%, transparent 92%);
  padding: 0 2px;
  border-radius: 2px;
}

.hint {
  width: fit-content;
  margin: 24px auto 2px;
  background: var(--shu);
  color: #fdf8ec;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .22em; text-indent: .22em;
  padding: 12px 34px;
  border-radius: 999px;
  box-shadow: 0 2px 0 var(--shu-deep), 0 4px 14px rgba(166, 58, 34, .28);
  animation: beckon 1.8s ease-in-out infinite;
}
@keyframes beckon {
  0%, 100% { transform: translateY(0); box-shadow: 0 2px 0 var(--shu-deep), 0 4px 14px rgba(166, 58, 34, .28); }
  50% { transform: translateY(-3px); box-shadow: 0 5px 0 var(--shu-deep), 0 8px 20px rgba(166, 58, 34, .34); }
}

/* ---- 答え ---- */
.answer {
  margin-top: 22px;
  border-top: 1px dashed var(--line);
  padding-top: 20px;
  animation: unfold .35s ease;
}
@keyframes unfold {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

.a-label {
  font-size: 10.5px; color: var(--shu); letter-spacing: .3em;
  margin-bottom: 8px;
}
.a-en {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.9;
}
.a-en b {
  font-weight: 700;
  background: linear-gradient(transparent 82%, var(--shu) 82%);
  padding-bottom: 1px;
}
.a-ja { font-size: 13px; color: var(--sumi); margin: 8px 0 20px; }

.a-note {
  font-size: 13px; color: var(--sumi);
  line-height: 1.9;
  background: #f6efdc;
  border-left: 3px solid var(--shu);
  border-radius: 0 3px 3px 0;
  padding: 10px 14px;
  margin-bottom: 20px;
}

.breakdown { list-style: none; }
.breakdown li {
  font-size: 14.5px;
  padding: 8px 2px;
  border-bottom: 1px solid var(--line-soft);
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 9px;
}
.breakdown li:last-child { border-bottom: none; }
.breakdown .bd-blend { font-family: var(--serif); font-size: 17.5px; font-weight: 600; }
.breakdown .bd-arrow { color: var(--faint); font-size: 12px; }
.breakdown .bd-word { font-family: var(--serif); font-size: 17.5px; color: var(--shu-deep); }
.breakdown .bd-how { font-size: 12px; color: var(--faint); }

.a-actions {
  margin-top: 22px;
  display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
}

.btn {
  appearance: none; cursor: pointer; text-decoration: none;
  font-family: var(--sans); font-size: 14px;
  padding: 11px 26px;
  border-radius: 3px;
  border: 1px solid var(--ink);
  background: var(--ink); color: #f6f2e6;
  letter-spacing: .12em;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: #3a372f; border-color: #3a372f; }
.btn:active { transform: translateY(1px); }
.btn-ghost {
  background: none; color: var(--sumi);
  border-color: var(--line);
  font-size: 12px;
}
.btn-ghost:hover { background: #f2ecdb; border-color: var(--line); }

.counter {
  text-align: center;
  font-size: 11px;
  color: var(--faint);
  margin: 16px 0 44px;
  letter-spacing: .15em;
}

/* ---- 道具（AI・貼り付け） ---- */
.tool { border-top: 1px solid var(--line); }
.tool:last-of-type { border-bottom: 1px solid var(--line); margin-bottom: 52px; }
.tool summary {
  cursor: pointer;
  font-size: 14px;
  padding: 16px 4px;
  color: var(--ink);
  letter-spacing: .06em;
  list-style: none;
  transition: color .15s;
}
.tool summary:hover { color: var(--shu-deep); }
.tool summary::-webkit-details-marker { display: none; }
.tool summary::before {
  content: "＋";
  color: var(--shu);
  font-family: var(--serif);
  margin-right: 10px;
}
.tool[open] summary::before { content: "－"; }
.tool-body { padding: 2px 4px 24px; }
.tool-desc { font-size: 12.5px; color: var(--sumi); margin-bottom: 12px; line-height: 1.9; }
.quota { color: var(--faint); }

.tool-row { display: flex; gap: 10px; align-items: center; }
.tool-row input[type="text"] {
  flex: 1;
  font-family: var(--sans); font-size: 15px;
  padding: 11px 13px;
  border: 1px solid var(--line); border-radius: 3px;
  background: var(--card);
}
.tool-row input:focus, textarea:focus { outline: none; border-color: var(--sumi); }

textarea {
  width: 100%;
  font-family: var(--sans); font-size: 14px; line-height: 1.8;
  padding: 12px 13px;
  border: 1px solid var(--line); border-radius: 3px;
  background: var(--card);
  resize: vertical;
  margin-bottom: 8px;
}
.charcount { font-size: 11px; color: var(--faint); margin-right: auto; letter-spacing: .05em; }
.tool-status { font-size: 12.5px; color: var(--shu); margin-top: 10px; min-height: 1em; }

/* ---- 変換された読みもの ---- */
.reading {
  margin-top: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 24px;
}
.reading-note { font-size: 11.5px; color: var(--faint); margin-bottom: 14px; letter-spacing: .05em; }
.r-sentence {
  font-family: var(--serif);
  font-size: 20px; line-height: 2.1;
  margin-bottom: 4px;
  word-break: break-word;
}
.r-sentence .k { cursor: pointer; }
.r-sentence .k.revealed {
  background: none;
  border-bottom: 1px solid var(--shu);
  color: var(--shu-deep);
}
.r-ja { font-size: 12px; color: var(--faint); margin-bottom: 16px; }

/* ---- 足・はらだ英語 ---- */
.foot { padding: 0 20px 48px; text-align: center; }

.harada-link {
  display: block;
  text-decoration: none;
  border: 1.5px solid var(--shu);
  border-radius: 6px;
  padding: 18px 20px 16px;
  background: var(--card);
  transition: background .15s, box-shadow .15s;
  box-shadow: 0 2px 6px rgba(166, 58, 34, .08);
}
.harada-link:hover { background: #fbf3e4; box-shadow: 0 4px 14px rgba(166, 58, 34, .14); }
.hl-sub {
  display: block;
  font-size: 11.5px;
  color: var(--sumi);
  letter-spacing: .12em;
  margin-bottom: 4px;
}
.hl-main {
  display: block;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--shu);
  letter-spacing: .1em;
}

.credit {
  margin-top: 22px;
  font-size: 10.5px;
  color: var(--faint);
  line-height: 2;
}

@media (max-width: 480px) {
  .q-blend { font-size: 22px; }
  .top h1 { font-size: 26px; }
  .card { padding: 28px 20px 22px; }
}