/* ピアノ教室の試作 ── 共通の見た目（楽典ドリル public/style.css の「象牙と黒檀」をそのまま流用）2026-10-11
   モチーフは 2 つだけ＝上の鍵盤の帯と、見出しの下の五線。ダークモードは作らない。 */
:root {
  color-scheme: light;
  --ivory: #f7f3ea;
  --ivory-hi: #fffdf7;
  --ivory-lo: #ebe4d6;
  --ebony: #15120f;
  --ebony-2: #2a2520;
  --sub: #6b6258;
  --line: #ddd4c4;
  --brass: #b8893a;
  --brass-ink: #7d5a1c;
  --brass-soft: #f3e7cc;
  --ng: #9b3b2e;
  --ng-soft: #f6e4df;
  --serif: "Shippori Mincho", "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(21, 18, 15, .06), 0 6px 18px rgba(21, 18, 15, .07);
  --wrap: 720px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--ivory); }
body {
  margin: 0;
  background: var(--ivory);
  color: var(--ebony);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  padding: 0 16px calc(40px + env(safe-area-inset-bottom));
  overflow-x: hidden;
}
body.wide { --wrap: 960px; }
button, input, textarea, select { font: inherit; color: inherit; }
button { -webkit-tap-highlight-color: transparent; touch-action: manipulation; cursor: pointer; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--brass); outline-offset: 2px; }
a { color: var(--brass-ink); }
.hidden { display: none !important; }

/* ── 上の鍵盤の帯 */
.keys-band {
  margin: 0 -16px;
  height: 30px;
  background:
    linear-gradient(90deg,
      transparent 0 10px, var(--ebony) 10px 18px, transparent 18px 24px, var(--ebony) 24px 32px,
      transparent 32px 52px, var(--ebony) 52px 60px, transparent 60px 66px, var(--ebony) 66px 74px,
      transparent 74px 80px, var(--ebony) 80px 88px, transparent 88px 98px) 0 0 / 98px 62% repeat-x,
    repeating-linear-gradient(90deg, var(--ivory-hi) 0 13px, #cfc5b3 13px 14px),
    var(--ivory-hi);
  border-top: 3px solid var(--ebony);
  border-bottom: 2px solid var(--brass);
  box-shadow: 0 3px 10px rgba(21, 18, 15, .10);
}

/* ── 見出し（明朝・下に五線） */
.site-head { max-width: var(--wrap); margin: 0 auto; padding: 18px 0 6px; }
.site-head .back { display: inline-flex; align-items: center; min-height: 40px; font-size: 14px; text-decoration: none; color: var(--sub); }
.site-head h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.35;
  letter-spacing: .04em;
  margin: 0;
  padding-bottom: 14px;
  background: repeating-linear-gradient(to bottom, rgba(184, 137, 58, .55) 0 1px, transparent 1px 3px) left bottom / 100% 13px no-repeat;
}
.h1-trial { white-space: nowrap; font-size: .6em; letter-spacing: .02em; color: var(--sub); font-weight: 600; margin-left: .2em; }
.trial-note { margin: 8px 0 0; font-size: 12px; color: var(--sub); }
.trial-note span { display: inline-block; }
.who { margin: 10px 0 0; font-size: 15px; color: var(--ebony-2); }
.who b { font-family: var(--serif); font-size: 17px; }
main { max-width: var(--wrap); margin: 0 auto; }
@media (min-width: 600px) { .site-head h1 { font-size: 30px; } }

/* ── 見出し 2・カード */
h2.sec {
  font-family: var(--serif); font-weight: 700; font-size: 21px; letter-spacing: .04em;
  margin: 22px 0 10px;
}
h3 { font-family: var(--serif); font-weight: 700; font-size: 18px; letter-spacing: .03em; margin: 0 0 6px; }
.card {
  background: var(--ivory-hi); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin: 0 0 14px; box-shadow: var(--shadow);
}
.muted { color: var(--sub); font-size: 14px; }
.small { font-size: 13px; }
.lead { margin: 0 0 12px; font-size: 15px; color: var(--ebony-2); }

/* ── ボタン（ドリルと同じ形） */
.big {
  display: block; width: 100%; border: 0; background: var(--ebony); color: var(--ivory-hi);
  border-radius: 14px; min-height: 56px; font-size: 18px; font-weight: 700; letter-spacing: .06em;
  margin: 10px 0;
  box-shadow: inset 0 -3px 0 var(--brass), 0 4px 12px rgba(21, 18, 15, .16);
  transition: transform .08s ease-out;
}
.big:active { transform: translateY(2px); }
.big:disabled { background: #b9b0a3; box-shadow: none; cursor: default; }
.big.sub { background: var(--ivory-hi); color: var(--ebony); border: 1.5px solid var(--ebony); box-shadow: none; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 48px; padding: 6px 16px; border-radius: 12px;
  border: 1.5px solid var(--ebony); background: var(--ivory-hi); color: var(--ebony);
  font-size: 15px; font-weight: 700;
}
.btn.dark { background: var(--ebony); color: var(--ivory-hi); box-shadow: inset 0 -3px 0 var(--brass); }
.btn.quiet { border-color: var(--line); color: var(--ebony-2); font-weight: 500; }
.btn:disabled { opacity: .45; cursor: default; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }

/* 選ぶボタン（白鍵の手触り）。aria-pressed で選んだ状態 */
.pick {
  min-height: 48px; padding: 6px 12px; border-radius: 12px;
  border: 1px solid #cfc5b3;
  background: linear-gradient(to bottom, var(--ivory-hi) 0%, var(--ivory-hi) 75%, var(--ivory-lo) 100%);
  box-shadow: 0 2px 0 #d8cfbf;
  font-size: 16px; font-weight: 700; color: var(--ebony);
  transition: transform .08s ease-out, background .15s, border-color .15s;
}
.pick:active { transform: translateY(2px); box-shadow: none; }
.pick[aria-pressed="true"] {
  background: var(--ebony); color: var(--ivory-hi); border-color: var(--ebony);
  box-shadow: inset 0 -3px 0 var(--brass);
}
.pick-grid { display: grid; gap: 8px; }
.pick-grid.c4 { grid-template-columns: repeat(4, 1fr); }
.pick-grid.c3 { grid-template-columns: repeat(3, 1fr); }
.pick-grid.c1 { grid-template-columns: 1fr; }
.pick.wide { text-align: left; padding: 10px 14px; font-weight: 500; }
.pick .pk-mark { font-family: var(--serif); font-size: 20px; display: block; line-height: 1.1; }
.pick-grid.c3 .pick { padding: 6px 2px; white-space: nowrap; letter-spacing: -.02em; }

/* ── 段階のバー（5 段の鍵盤） */
.stagebar { display: grid; grid-template-columns: repeat(5, 1fr); gap: 3px; margin: 6px 0 2px; }
.stagebar .st { text-align: center; min-width: 0; }
.stagebar .st i {
  display: block; height: 18px; border: 1px solid #cfc5b3; border-top: 2px solid var(--ebony);
  border-radius: 0 0 4px 4px; background: var(--ivory-hi);
}
.stagebar .st.on i { background: var(--brass); border-color: var(--brass); border-top-color: var(--ebony); }
.stagebar .st span { display: block; font-size: 11px; color: var(--sub); margin-top: 3px; white-space: nowrap; letter-spacing: -.02em; }
.stagebar .st.cur span { color: var(--brass-ink); font-weight: 700; }

/* ── 表 */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 0 14px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--ivory-hi); box-shadow: var(--shadow); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 15px; }
.tbl th, .tbl td { padding: 10px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.tbl th { font-size: 13px; color: var(--sub); font-weight: 500; background: var(--ivory); white-space: nowrap; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl td.nw { white-space: nowrap; }
.tbl td.num, .tbl th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.tbl tfoot td { background: var(--ivory); font-weight: 700; }

/* ── 小さな印 */
.tag { font-family: var(--sans); vertical-align: middle; display: inline-block; font-size: 12px; font-weight: 700; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); background: var(--ivory); color: var(--ebony-2); white-space: nowrap; }
.tag.brass { background: var(--brass-soft); border-color: #e2cc9c; color: var(--brass-ink); }
.tag.ng { background: var(--ng-soft); border-color: #e5bdb4; color: var(--ng); }
.tag.dark { background: var(--ebony); border-color: var(--ebony); color: var(--ivory-hi); }

/* ── 入力 */
label.fld { display: block; font-size: 13px; color: var(--sub); margin: 8px 0 4px; }
input[type="text"], textarea {
  width: 100%; min-height: 48px; padding: 10px 12px; border-radius: 10px;
  border: 1px solid #cfc5b3; background: #fff; font-size: 16px;
}
textarea { min-height: 64px; resize: vertical; line-height: 1.5; }

/* ── 見本のデータに戻す */
.reset-area { max-width: var(--wrap); margin: 30px auto 0; padding: 16px 0 0; border-top: 1px dashed var(--line); text-align: center; }
.reset-area p { margin: 0 0 8px; font-size: 12px; color: var(--sub); }
.reset-btn { min-height: 48px; padding: 6px 18px; border-radius: 999px; border: 1px solid var(--line); background: var(--ivory-hi); color: var(--sub); font-size: 14px; }
.reset-btn.armed { border-color: var(--ng); color: var(--ng); background: var(--ng-soft); }

/* ── お知らせの小窓 */
.toast {
  position: fixed; left: 50%; bottom: calc(96px + env(safe-area-inset-bottom)); transform: translate(-50%, 20px);
  background: var(--ebony); color: var(--ivory-hi); padding: 12px 18px; border-radius: 12px;
  font-size: 15px; box-shadow: 0 8px 24px rgba(21, 18, 15, .25); border-bottom: 3px solid var(--brass);
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 70; max-width: calc(100% - 32px); text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ── トップの入口 */
.entry {
  display: block; text-decoration: none; color: var(--ebony);
  background: var(--ivory-hi); border: 1px solid var(--line); border-top: 3px solid var(--ebony);
  border-radius: 6px 6px var(--radius) var(--radius); box-shadow: var(--shadow), inset 0 -5px 0 rgba(21, 18, 15, .05);
  padding: 18px 18px 18px; margin: 0 0 14px; min-height: 48px;
  transition: transform .08s ease-out;
}
.entry:active { transform: translateY(2px); }
.entry .e-who { font-size: 13px; color: var(--brass-ink); font-weight: 700; letter-spacing: .06em; }
.entry .e-title { display: block; font-family: var(--serif); font-size: 22px; font-weight: 700; letter-spacing: .04em; margin: 2px 0 4px; }
.entry .e-desc { display: block; font-size: 14px; color: var(--sub); }
.entry .e-go { display: inline-block; margin-top: 10px; font-weight: 700; font-size: 15px; }
.drill-link { display: flex; align-items: center; min-height: 48px; padding: 8px 16px; border: 1px dashed #cfc5b3; border-radius: 12px; background: transparent; text-decoration: none; font-size: 15px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}