/* 스피커·이어폰 좌우 테스트(speaker-test) — 청취 무대. 작업면 컨테이너 slrw: 단계 탭 3칸 → 무대(설정 줄 · 그림 · 단추 3칸) → 탭별 판넬 → 종합.
   고른 탭과 무대는 같은 톤으로 이어 붙인다. 강조색은 지금 나는 소리(위치 점·퍼지는 고리·반전된 파형·주파수 커서)에만 쓴다.
   520 이하: 답 2 × 2, 저음 판넬 한 열, 종합 단추 아래 줄 / 480 이하: 탭 번호·단추 아이콘 숨김. */
.slr{container:slrw / inline-size;--slr-tone:color-mix(in srgb, var(--wash) 70%, var(--paper))}
.slr [hidden]{display:none !important}

/* ---------- 단계 탭 ---------- */
.slr-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--soft)}
.slr-tab{display:flex;align-items:center;gap:10px;min-width:0;padding:10px 14px;border:0;border-right:1px solid var(--soft);background:transparent;font-family:var(--sans);text-align:left;color:var(--muted);cursor:pointer;transition:background var(--ease),color var(--ease)}
.slr-tab:last-child{border-right:0}
.slr-tab:hover{background:color-mix(in srgb, var(--wash) 40%, transparent);color:var(--ink)}
.slr-tab[aria-pressed="true"]{background:var(--slr-tone);color:var(--ink);box-shadow:inset 0 -2px 0 var(--ink)}
.slr-tab:focus-visible{outline:2px solid var(--ink);outline-offset:-4px}
.slr-tn{flex:none;display:grid;place-items:center;width:24px;height:24px;border:1px solid var(--line);border-radius:50%;font-family:var(--mono);font-size:12px;font-weight:700}
.slr-tab[aria-pressed="true"] .slr-tn{background:var(--fill);border-color:var(--fill);color:var(--on-fill)}
.slr-tab.is-next .slr-tn{border:1.5px dashed var(--ink);color:var(--ink)}
.slr-tt{display:flex;flex-direction:column;gap:1px;min-width:0}
.slr-tt b{font-size:13.5px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.slr-tt small{font-size:11.5px;font-weight:600;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.slr-tt small[data-s="ok"],.slr-tt small[data-s="warn"],.slr-tt small[data-s="bad"]{color:var(--ink)}
.slr-tt small[data-s="ok"]::before{content:"✓ "}
.slr-tt small[data-s="warn"]::before{content:"! "}
.slr-tt small[data-s="bad"]::before{content:"✕ "}

/* ---------- 무대 ---------- */
.slr-stage{background:var(--slr-tone)}
.slr-set{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;padding:12px 14px 0}
.slr-dev button{display:inline-flex;align-items:center;gap:5px}
.slr-dev .i{width:14px;height:14px}
.slr-out{margin-right:auto;font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap}
.slr-volw{display:inline-flex;align-items:center;gap:8px}
.slr-svg{display:block;width:100%;height:clamp(176px,30cqw,250px)}
.slr-svg .slr-line{fill:none;stroke:var(--line);stroke-width:1.2;stroke-dasharray:2 5}
.slr-svg .slr-path{fill:none;stroke:var(--line);stroke-width:1;stroke-dasharray:3 6;opacity:.7}
.slr-svg .slr-cab rect,.slr-svg .slr-cab circle,.slr-svg .slr-head *,.slr-svg .slr-face{fill:var(--card);stroke:var(--ink);stroke-width:1.5}
.slr-svg .slr-cab circle{fill:var(--wash)}
.slr-svg .slr-cab .slr-tw{fill:var(--ink)}
.slr-svg .slr-band{fill:none;stroke:var(--ink);stroke-width:5;stroke-linecap:round}
.slr-svg .slr-cup rect{fill:var(--ink)}
.slr-svg .slr-lb{font-family:var(--mono);font-size:12px;font-weight:700;fill:var(--muted);text-anchor:middle}
.slr-svg .slr-lb--in{fill:var(--paper)}
.slr-svg .slr-src{fill:var(--accent);opacity:0;transition:opacity var(--ease)}
.slr-svg .slr-blur{fill:var(--accent);opacity:0;transition:opacity var(--ease)}
.slr[data-src="on"] .slr-src{opacity:1}
.slr[data-src="blur"] .slr-blur{opacity:.26}
.slr-rg{transition:opacity 80ms linear}
.slr-rg path{fill:none;stroke:var(--line);stroke-width:1.5;stroke-linecap:round;opacity:.5}
.slr[data-ring~="L"] #slrRgL path,.slr[data-ring~="R"] #slrRgR path{stroke:var(--accent);stroke-width:2;animation:slr-wave 1.05s ease-in-out infinite;animation-delay:var(--d)}
@keyframes slr-wave{0%,100%{opacity:.16}40%{opacity:1}}
.slr-gl{display:none}
.slr[data-tab="ph"] .slr-gl{display:inline}
.slr-gw{fill:none;stroke:var(--ink);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.slr-gw--b{display:none}
.slr[data-ph="b"] .slr-gl--R .slr-gw{display:none}
.slr[data-ph="b"] .slr-gl--R .slr-gw--b{display:inline;stroke:var(--accent)}

/* 단추 세 칸: 칸 가운데 = 그림의 왼쪽·가운데·오른쪽(tool.js 가 칸 위치로 그림을 맞춘다) */
.slr-tr{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;padding:0 14px 14px}
.slr-col{display:flex;flex-direction:column;align-items:center;gap:5px;min-width:0}
.slr-col .v2-btn{width:100%;max-width:220px;height:auto;min-height:var(--v2-ctl);justify-content:center;padding:5px 10px;font-size:13.5px;line-height:1.2;text-align:center;white-space:normal}
.slr-col .v2-btn .i{flex:none;width:16px;height:16px}
.slr-col .v2-btn[aria-pressed="true"],.slr-col .v2-btn.is-run{background:var(--fill);border-color:var(--fill);color:var(--on-fill)}
.slr-ch.is-next:not(:focus-visible){outline:1.5px dashed var(--ink);outline-offset:2px}
.slr-cap{font-family:var(--sans);font-size:12px;font-weight:600;line-height:1.35;text-align:center;color:var(--muted)}
.slr-cap[data-s="ok"],.slr-cap[data-s="warn"]{color:var(--ink)}
.slr-cap[data-s="bad"]{color:var(--ink);font-weight:750}
.slr-cap[data-s="ok"]::before{content:"✓ "}
.slr-cap[data-s="warn"]::before{content:"! "}
.slr-cap[data-s="bad"]::before{content:"✕ "}

/* ---------- 판넬 ---------- */
.slr-panel{padding:14px 16px;border-top:1px solid var(--soft)}
.slr-qh{display:flex;align-items:center;justify-content:space-between;gap:8px 12px;margin-bottom:10px}
.slr-q{margin:0;font-family:var(--sans);font-size:14px;font-weight:650;line-height:1.45;color:var(--ink)}
.slr-move{flex:none}
.slr-move[aria-pressed="true"]{background:var(--fill);border-color:var(--fill);color:var(--on-fill)}
.slr-hint{margin:4px 0 10px;font-family:var(--sans);font-size:12.5px;line-height:1.55;color:var(--muted)}
.slr-ans{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}
.slr-ans button{min-height:40px;padding:6px 8px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);font-family:var(--sans);font-size:13px;font-weight:650;line-height:1.25;color:var(--ink);cursor:pointer;transition:background var(--ease),color var(--ease),border-color var(--ease)}
.slr-ans button:hover:not(:disabled){background:var(--btn)}
.slr-ans button[aria-pressed="true"]{background:var(--fill);border-color:var(--fill);color:var(--on-fill)}
.slr-ans button:disabled{opacity:.45;cursor:not-allowed}

/* 저음: 읽기 | 눈금자(20~320 Hz 로그, 악기 최저음 · 목소리 기본 주파수 대역) */
.slr-bp{display:grid;grid-template-columns:minmax(130px,170px) minmax(0,1fr);gap:18px;align-items:center}
.slr-read{display:flex;flex-direction:column;gap:2px;min-width:0}
.slr-hz{font-family:var(--sans);font-size:40px;font-weight:800;line-height:1.05;letter-spacing:-.02em;font-variant-numeric:tabular-nums lining-nums;color:var(--ink);white-space:nowrap}
.slr-hz em{font-style:normal;font-size:16px;font-weight:700;letter-spacing:0;color:var(--muted)}
.slr-read small{font-family:var(--sans);font-size:12px;line-height:1.4;color:var(--muted)}
.slr-ruler{position:relative;height:78px;margin:0 4px}
.slr-rb{position:absolute;left:0;right:0;top:22px;height:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper)}
.slr-vb{position:absolute;top:0;bottom:0;display:grid;place-items:center;overflow:hidden;background:color-mix(in srgb, var(--wash) 75%, var(--line))}
.slr-vb em{font-style:normal;font-family:var(--sans);font-size:10.5px;font-weight:650;color:var(--ink);white-space:nowrap}
.slr-vb em.s,.slr-vb.is-short em{display:none}
.slr-vb.is-short em.s{display:inline}
.slr-lm{position:absolute;top:-23px;bottom:-1px;width:0;border-left:1px solid var(--ink)}
.slr-lm em{position:absolute;top:0;left:0;transform:translateX(-50%);font-style:normal;font-family:var(--sans);font-size:11px;font-weight:650;color:var(--ink);white-space:nowrap;background:var(--card);padding:0 2px}
.slr-cur{position:absolute;top:16px;left:0;width:2px;height:36px;margin-left:-1px;background:var(--accent);opacity:0}
.slr-cur.is-run{opacity:1}
.slr-marks{position:absolute;left:0;right:0;top:0;height:78px;pointer-events:none}
.slr-mk{position:absolute;width:0;height:0}
.slr-mk--h{top:12px;margin-left:-6px;border-left:6px solid transparent;border-right:6px solid transparent;border-top:9px solid var(--ink)}
.slr-mk--b{top:48px;margin-left:-5px;width:10px;height:10px;background:linear-gradient(45deg,transparent 42%,var(--ink) 42% 58%,transparent 58%),linear-gradient(-45deg,transparent 42%,var(--ink) 42% 58%,transparent 58%)}
.slr-rx{position:absolute;left:0;right:0;top:60px;height:16px}
.slr-rx span{position:absolute;top:0;transform:translateX(-50%);font-family:var(--mono);font-size:11px;color:var(--muted);white-space:nowrap}
.slr-rx span:first-child{transform:none}
.slr-rx span:last-child{transform:translateX(-100%)}
.slr-rx span:last-child::after{content:" Hz"}

/* ---------- 종합 ---------- */
.slr-sum{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 18px;padding:14px 16px;border-top:1px solid var(--soft)}
.slr-sh{display:flex;align-items:baseline;gap:10px;margin:0 0 6px;font-family:var(--sans);font-size:13px;color:var(--ink)}
.slr-sh span{font-size:12px;color:var(--muted)}
.slr-sl{display:grid;gap:9px;margin:0;padding:0;list-style:none}
.slr-sl li{position:relative;padding-left:22px;font-family:var(--sans);font-size:13.5px;line-height:1.5;color:var(--ink)}
.slr-sl li b{font-weight:700}
.slr-sl li small{display:block;margin-top:2px;font-size:12.5px;line-height:1.55;color:var(--muted)}
.slr-sl li::before{position:absolute;left:0;top:0;width:16px;font-weight:800;text-align:center}
.slr-sl li[data-s="ok"]::before{content:"✓"}
.slr-sl li[data-s="warn"]::before{content:"!"}
.slr-sl li[data-s="bad"]::before{content:"✕"}
.slr-sl li.is-guide{padding-left:0;font-size:13px;color:var(--muted)}
.slr-sb{display:flex;flex-direction:column;gap:6px;align-self:start}
.slr-sb .v2-btn{justify-content:center}
.slr-next{grid-column:1 / -1;justify-self:start;font-family:var(--sans);font-size:13px;font-weight:650;color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.slr-msg{margin:0;padding:9px 16px 12px;border-top:1px solid var(--soft)}

@container slrw (max-width:520px){
  .slr-ans{grid-template-columns:repeat(2,minmax(0,1fr))}
  .slr-bp{grid-template-columns:minmax(0,1fr);gap:10px}
  .slr-read{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:baseline;column-gap:12px}
  .slr-read .v2-label{grid-column:1 / -1}
  .slr-sum{grid-template-columns:minmax(0,1fr)}
  .slr-sb{flex-direction:row;flex-wrap:wrap}
}
@container slrw (max-width:480px){
  .slr-tab{gap:0;padding:9px 10px}
  .slr-tn{display:none}
  .slr-tt b{font-size:13px}
  .slr-col .v2-btn{padding:5px 6px;font-size:13px}
  .slr-col .v2-btn .i{display:none}
  .slr-set{padding:10px 10px 0}
  .slr-tr{gap:6px;padding:0 10px 12px}
  .slr-panel,.slr-sum{padding:12px}
  .slr-msg{padding:9px 12px 12px}
  .slr-qh{flex-wrap:wrap}
}
@media (prefers-reduced-motion:reduce){
  .slr[data-ring~="L"] #slrRgL path,.slr[data-ring~="R"] #slrRgR path{animation:none;opacity:1}
  .slr-tab,.slr-ans button,.slr-svg .slr-src,.slr-svg .slr-blur,.slr-rg{transition:none}
}