/* ==========================================================================
 * Jazz Guitar Lab ― 大人のジャズ練習室
 *   アイボリー／チャコール／深いグリーン／控えめなゴールド
 * ========================================================================== */
:root {
  --ivory: #F5EFE0;
  --paper: #FBF8F0;
  --charcoal: #26282B;
  --ink: #26282B;
  --muted: #5B574B;
  --green: #1F4D3A;
  --green-d: #163A2B;
  --gold: #C9A24A;
  --gold-d: #7A5C14;
  --blue: #2E4A78;
  --line: #CFC5AA;
  --board: #E6D9B8;
  --danger: #A8321F;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--ivory); color: var(--ink);
  font-family: var(--font); font-size: 16px; line-height: 1.65;
  padding-bottom: env(safe-area-inset-bottom);
}
h1, h2, h3, h4, p { margin: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: -999px; top: 0; background: var(--gold); color: #000; padding: 8px 12px; z-index: 100; }
.skip-link:focus { left: 8px; top: 8px; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
button, select, input { font-family: inherit; }

/* ---- ヘッダー ---- */
.app-header {
  position: sticky; top: 0; z-index: 30; background: var(--charcoal); color: var(--ivory);
  display: flex; align-items: center; gap: 8px;
  padding: calc(8px + env(safe-area-inset-top)) 12px 8px; min-height: 58px;
}
.app-title { flex: 1; min-width: 0; text-align: center; }
.app-title h1 { font-size: 18px; letter-spacing: .04em; font-weight: 700; line-height: 1.25; }
.app-sub { font-size: 12px; color: #D8CFB6; letter-spacing: .06em; }
.hbtn {
  min-height: 44px; min-width: 64px; padding: 6px 12px; border-radius: 8px; border: 1px solid #6a6a60;
  background: transparent; color: var(--ivory); font-size: 15px; cursor: pointer;
}
.hbtn[hidden] { display: none; }
.hbtn:hover { background: #3a3d41; }
#btn-back[hidden] + .app-title { margin-left: 64px; }

/* ---- 選択中・音量・停止（常に見える） ---- */
.ctx-bar {
  position: sticky; top: 58px; z-index: 20; background: var(--green); color: #fff;
  display: flex; align-items: center; gap: 12px; padding: 6px 12px; flex-wrap: wrap;
}
.ctx-bar[hidden] { display: none; }
.ctx-now { font-weight: 700; font-size: 16px; flex: 1 1 140px; min-width: 120px; }
.ctx-vol { display: flex; align-items: center; gap: 8px; font-size: 14px; white-space: nowrap; }
.ctx-vol input { width: 110px; min-width: 80px; accent-color: var(--gold); height: 32px; }
.btn-stop { background: #3b4a42; color: #fff; border-color: #7f9a8b; min-width: 84px; }
.btn-stop.active { background: var(--danger); border-color: #fff; color: #fff; }
.btn-stop:disabled { opacity: .55; cursor: default; }

/* ---- 本文 ---- */
main { max-width: 1040px; margin: 0 auto; padding: 14px 12px 40px; outline: none; }
.lead { color: var(--muted); font-size: 15px; margin: 4px 0 12px; }
.lead.big { font-size: 22px; color: var(--ink); font-weight: 700; margin: 10px 0 14px; }
.flow { background: var(--paper); border-left: 4px solid var(--gold); padding: 8px 12px; margin-bottom: 14px; font-size: 15px; border-radius: 0 8px 8px 0; }
.panel { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; margin-bottom: 16px; }
.panel h2 { font-size: 18px; margin-bottom: 8px; color: var(--green-d); }
.panel h3 { font-size: 16px; }
.caution { color: #6a4a00; background: #FBF1D4; border: 1px solid #E2CB8A; border-radius: 8px; padding: 8px 10px; margin: 8px 0; font-size: 14px; }
.caution-inline { color: #6a4a00; }
.info { margin-top: 8px; }
.fld { margin: 12px 0 4px; }
.fld-label { display: block; font-weight: 700; font-size: 14px; color: var(--muted); margin: 8px 0 4px; }
select {
  width: 100%; max-width: 420px; min-height: 48px; font-size: 17px; padding: 8px 10px;
  border: 1.5px solid var(--green); border-radius: 8px; background: #fff; color: var(--ink);
}
input[type="range"] { width: 100%; max-width: 420px; accent-color: var(--green); height: 36px; }

/* ---- ボタン ---- */
.btn {
  min-height: 46px; padding: 8px 14px; border-radius: 9px; border: 1.5px solid var(--green);
  background: #fff; color: var(--green-d); font-size: 16px; font-weight: 600; cursor: pointer;
}
.btn:hover { background: #EEF3EE; }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-d); }
.btn.on { background: var(--gold); color: #1c1c1c; border-color: var(--gold-d); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  min-width: 52px; min-height: 48px; padding: 6px 10px; font-size: 18px; font-weight: 700;
  border: 1.5px solid var(--green); background: #fff; color: var(--green-d); border-radius: 9px; cursor: pointer;
}
.chip:hover { background: #EEF3EE; }
.chip.on { background: var(--green); color: #fff; }
.opts { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin-bottom: 10px; }
.seg { display: inline-flex; align-items: center; gap: 0; flex-wrap: wrap; }
.seg-label { font-size: 13px; color: var(--muted); margin-right: 8px; font-weight: 700; }
.seg-btn {
  min-height: 44px; padding: 6px 12px; font-size: 15px; border: 1.5px solid var(--green); background: #fff; color: var(--green-d);
  cursor: pointer; margin-left: -1.5px;
}
.seg-btn:first-of-type { border-radius: 8px 0 0 8px; margin-left: 0; }
.seg-btn:last-of-type { border-radius: 0 8px 8px 0; }
.seg-btn.on { background: var(--green); color: #fff; position: relative; }
.chk { display: flex; align-items: center; gap: 8px; min-height: 44px; font-size: 15px; }
.chk input { width: 22px; height: 22px; accent-color: var(--green); }

/* ---- トップのメニュー ---- */
.menu { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.menu-card {
  display: block; text-decoration: none; color: var(--ink); background: var(--paper); border: 1.5px solid var(--green);
  border-radius: 12px; padding: 16px; min-height: 120px;
}
.menu-card:hover { background: #fff; box-shadow: 0 2px 0 var(--gold); }
.mc-title { display: block; font-size: 22px; font-weight: 700; color: var(--green-d); }
.mc-en { display: block; font-size: 13px; letter-spacing: .08em; color: var(--gold-d); margin-bottom: 6px; }
.mc-desc { display: block; color: var(--muted); font-size: 15px; }
.soon { list-style: none; padding: 0; margin: 0 0 8px; }
.soon li { display: flex; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--line); color: var(--muted); }
.soon-tag { font-size: 13px; background: #EDE6D0; border-radius: 6px; padding: 2px 8px; white-space: nowrap; }

/* ---- 選んだコード／スケール ---- */
.hero { text-align: left; }
.hero-sym { font-size: 44px; font-weight: 700; color: var(--green-d); line-height: 1.2; letter-spacing: .01em; }
.hero-sc { font-size: 26px; }
.hero-sub { color: var(--muted); font-size: 15px; margin-bottom: 8px; }
.tones { list-style: none; padding: 0; margin: 8px 0; display: flex; flex-wrap: wrap; gap: 8px 10px; }
.tones li { display: inline-flex; align-items: center; gap: 4px; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 2px 10px 2px 4px; min-height: 40px; }
.tn { font-size: 20px; font-weight: 700; }
.td { font-size: 14px; color: var(--muted); margin-left: 2px; }
.ico { flex: none; }

/* ---- 指板 ---- */
.fb-wrap { margin: 8px -4px 0; }
.fb-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 6px; border-radius: 8px; }
.fb-svg { display: block; touch-action: pan-x pan-y; }
.fb-board { fill: var(--board); }
.fb-window { fill: #F2D98A; opacity: .55; }
.fb-fret { stroke: #8D8466; stroke-width: 2; }
.fb-nut { stroke: #2b2b2b; stroke-width: 6; }
.fb-string { stroke: #8C7A4A; }
.fb-string-1 { stroke-width: 1.2; } .fb-string-2 { stroke-width: 1.6; } .fb-string-3 { stroke-width: 2; }
.fb-string-4 { stroke-width: 2.6; } .fb-string-5 { stroke-width: 3.2; } .fb-string-6 { stroke-width: 4; }
.fb-fretno { font-size: 13px; fill: var(--muted); font-weight: 700; }
.fb-strno { font-size: 13px; fill: var(--muted); font-weight: 700; }
.fb-inlay { fill: #BDB08A; }
.fb-mute { font-size: 26px; font-weight: 700; fill: var(--danger); }
.fb-hit { fill: transparent; cursor: pointer; }
.mark { cursor: pointer; }
.mark:focus-visible { outline: none; }
.mark:focus-visible .mk { stroke: #E0432E; stroke-width: 4; }
.mk { stroke-linejoin: round; }
.mk-root { fill: var(--gold); stroke: var(--gold-d); stroke-width: 2; }
.mk-third { fill: var(--green); stroke: #0e2a1f; stroke-width: 1.5; }
.mk-seventh { fill: var(--blue); stroke: #172a47; stroke-width: 1.5; }
.mk-fifth, .mk-other { fill: var(--paper); stroke: var(--green); stroke-width: 2.5; }
.mk-tension { fill: #EADFBE; stroke: var(--gold-d); stroke-width: 2.5; stroke-dasharray: 4 3; }
.mk-t0, .mk-t1, .mk-t2 { font-weight: 700; pointer-events: none; fill: var(--ink); }
.mk-t0 { font-size: 15px; } .mk-t0.small { font-size: 12px; }
.mk-t1 { font-size: 12px; } .mk-t2 { font-size: 10.5px; }
.tr-root { fill: #1b1b1b; }
.tr-third, .tr-seventh { fill: #fff; }
.lvl-faint { opacity: .4; }
.lvl-dim { opacity: .3; }
.mark.hot .mk { stroke: #D9381E; stroke-width: 5; }
.mark.hot { filter: drop-shadow(0 0 4px rgba(217, 56, 30, .7)); }
.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 16px; padding: 0; margin: 8px 0 0; font-size: 14px; color: var(--muted); }
.legend li { display: inline-flex; align-items: center; gap: 4px; }
.tapinfo { margin-top: 8px; min-height: 28px; padding: 6px 10px; background: #fff; border: 1px solid var(--line); border-radius: 8px; font-size: 15px; }
.selnote { color: var(--muted); font-size: 14px; margin-top: 8px; }
.mono { font-family: var(--mono); letter-spacing: .02em; }
.play-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 6px; }
.cand-row, .cand { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 8px 0; }
.cand { flex-direction: column; align-items: flex-start; }
.cand li { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.cand-note { color: var(--muted); font-size: 14px; }
.from { border-color: var(--gold); }

/* ---- 押さえ方カード ---- */
.vcat { margin: 16px 0 8px; padding-bottom: 4px; border-bottom: 2px solid var(--gold); color: var(--green-d); }
.vlist { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); }
.vcard { display: flex; gap: 10px; background: #fff; border: 1.5px solid var(--line); border-radius: 12px; padding: 10px; }
.vcard.sel { border-color: var(--gold-d); box-shadow: 0 0 0 3px #F2D98A; }
.vcard-box { flex: none; }
.vcard-main { flex: 1; min-width: 0; }
.vcard h4 { font-size: 16px; line-height: 1.35; }
.vtag { color: var(--gold-d); font-size: 13px; font-weight: 700; margin-bottom: 4px; }
.vtext, .vnotes, .vrange { font-size: 15px; }
.vnotes small { color: var(--muted); font-size: 12px; margin-right: 3px; }
.vdesc { color: var(--muted); font-size: 13px; margin-top: 4px; }
.k { display: inline-block; min-width: 3.4em; color: var(--muted); font-size: 12px; font-weight: 700; }
.vbtns { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.vbtns .btn { min-height: 44px; font-size: 14px; padding: 6px 10px; }

.cbox { display: block; }
.cb-string { stroke: #6b6350; stroke-width: 1.6; }
.cb-fret { stroke: #A59B7E; stroke-width: 1.4; }
.cb-nut { stroke: #2b2b2b; stroke-width: 5; }
.cb-mute { font-size: 20px; font-weight: 700; fill: var(--danger); }
.cb-open { fill: none; stroke: var(--ink); stroke-width: 2; }
.cb-base { font-size: 12px; fill: var(--muted); font-weight: 700; }
.cb-strno { font-size: 11px; fill: var(--muted); }
.cb-t { font-size: 12px; font-weight: 700; pointer-events: none; fill: var(--ink); }
.cb-t.small { font-size: 9.5px; }

/* ---- 下部・ダイアログ・通知 ---- */
.app-footer { text-align: center; color: var(--muted); font-size: 13px; padding: 0 12px 28px; }
dialog { border: 2px solid var(--green); border-radius: 14px; padding: 0; max-width: min(640px, 94vw); background: var(--paper); color: var(--ink); }
dialog::backdrop { background: rgba(20, 20, 20, .55); }
.dlg-body { padding: 18px; max-height: 80vh; overflow: auto; }
.dlg-body h2 { font-size: 22px; margin-bottom: 8px; }
.dlg-body h3 { font-size: 16px; margin: 14px 0 4px; color: var(--green-d); }
.help-steps, .help-list { padding-left: 1.3em; margin: 6px 0; }
.help-note { color: var(--muted); font-size: 14px; margin-top: 10px; }
.dlg-actions { text-align: right; margin-top: 14px; }
.toast {
  position: fixed; left: 50%; bottom: calc(18px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  background: var(--charcoal); color: #fff; padding: 10px 16px; border-radius: 10px; font-size: 15px;
  opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 60; max-width: 90vw;
}
.toast.show { opacity: 1; }

@media (min-width: 760px) {
  main { padding: 20px 20px 48px; }
  .app-title h1 { font-size: 20px; }
}
@media (max-width: 420px) {
  .vcard { flex-direction: column; align-items: center; }
  .vcard-main { width: 100%; }
  .hero-sym { font-size: 38px; }
  .ctx-vol input { width: 90px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}