/* =====================================================================
   /oscillator/ : Model 4, the anharmonic oscillator
   Series colours: NiH = amber, PdH = orange-ink, PdD = crimson-ink,
   measured = white ink, perfect bowl and first run = neutral grey.
   Every class is prefixed oscillator-.
   ===================================================================== */
.page-oscillator { --ni: var(--amber); --ph: var(--orange-ink); --pd: var(--crimson-ink); --meas: var(--ink); --old: var(--ink-3); }

/* ---------- section heads ---------- */
.oscillator-head { margin-bottom: clamp(36px, 5vw, 64px); }
.oscillator-head .display-2 { text-wrap: balance; }
.oscillator-head--split { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 20px clamp(32px, 5vw, 96px); align-items: end; }
.oscillator-head--split .lead { margin-top: 0; max-width: 52ch; }
@media (max-width: 900px) { .oscillator-head--split { grid-template-columns: 1fr; align-items: start; } }
.oscillator-chips { margin-top: 22px; }
.oscillator-u { font: 400 11px/1.3 var(--font-mono); color: var(--ink-3); letter-spacing: 0.02em; text-transform: none; }
.oscillator-m { text-transform: none; letter-spacing: 0; }
.oscillator-h4 { font: 700 var(--fs-h4)/1.25 var(--font-display); letter-spacing: -0.015em; color: var(--ink); }
.oscillator-h4 .oscillator-u { font-weight: 400; margin-left: 6px; }
.oscillator-link { color: var(--ink); text-decoration-color: var(--amber); }
.oscillator-link:hover { color: var(--amber); }

/* ---------- hero ---------- */
.oscillator-hero { position: relative; isolation: isolate; overflow: hidden; background: var(--bg-deep); min-height: min(calc(100svh - var(--header-h)), 940px); display: flex; }
.oscillator-hero--noimg { background: radial-gradient(60% 70% at 70% 50%, rgba(100, 13, 95, 0.55), transparent 70%), radial-gradient(30% 30% at 60% 60%, rgba(235, 91, 0, 0.35), transparent 70%), var(--bg-deep); }
.oscillator-hero__media { position: absolute; inset: 0; z-index: -2; }
.oscillator-hero__media img { width: 100%; height: 100%; object-fit: cover; object-position: 64% 50%; }
.oscillator-hero__media::after { content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background:
    linear-gradient(90deg, rgba(18, 18, 18, 0.9) 0%, rgba(18, 18, 18, 0.62) 32%, rgba(18, 18, 18, 0) 60%),
    linear-gradient(180deg, rgba(18, 18, 18, 0.25) 0%, rgba(18, 18, 18, 0) 40%, rgba(18, 18, 18, 0) 70%, var(--bg-deep) 100%); }
.oscillator-hero__media .illus-tag { left: auto; right: var(--gutter); bottom: 20px; }
.oscillator-hero__inner { position: relative; display: flex; flex-direction: column; padding-top: 28px; padding-bottom: clamp(36px, 4vw, 56px); }
.oscillator-hero .crumbs { margin-bottom: 0; }
.oscillator-hero__copy { margin-top: clamp(24px, 7vh, 104px); max-width: 1000px; }
.oscillator-hero__title { font: 400 clamp(56px, 9.4vw, 160px)/0.86 var(--font-display); letter-spacing: var(--track-display); margin-left: -0.04em; max-width: 13ch; text-shadow: 0 2px 40px rgba(0, 0, 0, 0.45); }
.oscillator-hero__lead { font: 400 var(--fs-lead)/1.38 var(--font-text); color: var(--ink-2); max-width: 36ch; margin-top: clamp(24px, 3vw, 40px); letter-spacing: -0.012em; text-wrap: pretty; text-shadow: 0 1px 24px rgba(0, 0, 0, 0.6); }
.oscillator-hero__lead strong { color: var(--ink); font-weight: 400; }
.oscillator-onpage { display: flex; flex-wrap: wrap; gap: 4px 20px; margin-top: auto; padding-top: clamp(40px, 8vh, 96px); max-width: 780px; }
.oscillator-onpage a { font: 400 12.5px/1 var(--font-mono); color: var(--ink-2); text-decoration: none; padding: 9px 0; }
.oscillator-onpage a:hover { color: var(--amber); }
@media (max-width: 760px) {
  .oscillator-hero { flex-direction: column; min-height: 0; background: var(--bg); }
  .oscillator-hero__media { position: relative; order: 2; inset: auto; z-index: 0; aspect-ratio: 16 / 10; margin-top: 8px; }
  .oscillator-hero__media::after { background: linear-gradient(180deg, var(--bg) 0%, rgba(25, 25, 25, 0) 30%, rgba(25, 25, 25, 0) 75%, var(--bg) 100%); }
  .oscillator-hero__media img { object-position: 56% 50%; }
  .oscillator-hero__media .illus-tag { left: var(--gutter); right: auto; bottom: 14px; }
  .oscillator-hero__inner { order: 1; padding-bottom: 0; }
  .oscillator-hero__copy { margin-top: 28px; }
  .oscillator-onpage { order: 3; padding-top: 28px; gap: 0 16px; }
  .oscillator-onpage a { padding: 8px 0; }
}

/* ---------- in short ---------- */
.oscillator-short__grid { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: clamp(32px, 5vw, 88px); align-items: center; }
.oscillator-short__p { font: 400 clamp(18px, 1.45vw, 21px)/1.5 var(--font-text); color: var(--ink-2); max-width: 46ch; letter-spacing: -0.008em; }
.oscillator-short__p + .oscillator-short__p { margin-top: 0.75em; }
.oscillator-short__p strong { color: var(--ink); font-weight: 400; }
.oscillator-short .statbar__label { font-size: clamp(16px, 1.5vw, 23px); }
@media (max-width: 980px) { .oscillator-short__grid { grid-template-columns: 1fr; } }

/* ---------- 05.1 the model ---------- */
.oscillator-three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2vw, 28px); }
.oscillator-three__i { border-top: 3px solid var(--c); padding-top: 18px; }
.oscillator-three__k { font: 500 12px/1.3 var(--font-mono); color: var(--ink-3); letter-spacing: 0.03em; }
.oscillator-three__h { font: 400 clamp(24px, 2.2vw, 34px)/1.05 var(--font-display); letter-spacing: -0.03em; margin-top: 12px; }
.oscillator-three__i p:last-child { font: 400 16.5px/1.6 var(--font-text); color: var(--ink-2); margin-top: 14px; max-width: 40ch; }
@media (max-width: 860px) { .oscillator-three { grid-template-columns: 1fr; } }
.oscillator-out { margin-top: clamp(40px, 5vw, 64px); padding-top: 22px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 11em minmax(0, 1fr); gap: 16px 32px; align-items: start; }
.oscillator-out__k { font: 500 12px/1.3 var(--font-mono); color: var(--amber); letter-spacing: 0.03em; padding-top: 4px; }
.oscillator-out__list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px clamp(16px, 2vw, 28px); }
.oscillator-out__list a { display: grid; gap: 6px; text-decoration: none; padding: 2px 0 4px; }
.oscillator-out__list b { font: 400 clamp(20px, 1.7vw, 26px)/1.1 var(--font-display); letter-spacing: -0.025em; color: var(--ink); }
.oscillator-out__list b::after { content: " →"; color: var(--amber); transition: margin 0.2s var(--ease); }
.oscillator-out__list a:hover b::after { margin-left: 4px; }
.oscillator-out__list span { font: 400 13.5px/1.55 var(--font-mono); color: var(--ink-3); }
@media (max-width: 980px) { .oscillator-out { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .oscillator-out__list { grid-template-columns: 1fr; gap: 18px; } }

/* ---------- figure frame ---------- */
.oscillator-fig { margin: 0; border: 1px solid var(--line); border-radius: 10px; background: var(--bg-deep); overflow: hidden; min-width: 0; }
.band--deep .oscillator-fig { background: var(--bg); }
.oscillator-fig__bar { display: flex; align-items: center; gap: 12px; padding: 11px 16px; border-bottom: 1px solid var(--line); font: 500 11.5px/1.3 var(--font-mono); letter-spacing: 0.03em; color: var(--ink-2); text-transform: uppercase; }
.oscillator-fig__tag { color: var(--amber); white-space: nowrap; }
.oscillator-fig__cap { padding: 13px 16px 15px; border-top: 1px solid var(--line); font: 400 12.5px/1.65 var(--font-mono); color: var(--ink-3); }
.oscillator-fig__cap b { color: var(--ink-2); font-weight: 500; }
.oscillator-fig__cap .chip { margin: 2px 4px 0 0; }
.oscillator-fig__cap i { font-family: var(--font-text); }
.oscillator-fig__cap a:not(.chip) { color: var(--ink-2); text-decoration-color: var(--amber); }
.oscillator-noscript { margin-top: 12px; color: var(--ink-3); }

/* ---------- controls ---------- */
.oscillator-ctl { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.oscillator-ctl__g { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.oscillator-ctl__k { font: 500 11px/1 var(--font-mono); color: var(--ink-3); letter-spacing: 0.04em; text-transform: uppercase; margin-right: 6px; }
.oscillator-seg { font: 400 12.5px/1 var(--font-mono); color: var(--ink-2); padding: 9px 12px; min-height: 36px; border: 1px solid var(--line-2); border-radius: 3px; transition: color 0.2s, background 0.2s, border-color 0.2s; }
.oscillator-seg:hover { color: var(--ink); border-color: var(--ink-3); }
.oscillator-seg[aria-pressed="true"] { background: var(--amber); border-color: var(--amber); color: var(--on-amber); }
.oscillator-seg--ph[aria-pressed="true"] { background: var(--ph); border-color: var(--ph); color: var(--on-orange); }
.oscillator-seg--pd[aria-pressed="true"] { background: var(--pd); border-color: var(--pd); color: #121212; }
.oscillator-ctl__slider { flex: 1 1 360px; gap: 10px 14px; flex-wrap: nowrap; align-items: flex-start; }
.oscillator-ctl__slider .oscillator-ctl__k { padding-top: 12px; white-space: nowrap; }
.oscillator-ctl__out { font: 500 15px/1 var(--font-mono); color: var(--ink); min-width: 4.4em; text-align: right; font-variant-numeric: tabular-nums; padding-top: 10px; }
.no-js .oscillator-plot, .no-js .oscillator-ctl, .no-js [data-oscillator-levels] .oscillator-readout, .no-js [data-oscillator-pump] .oscillator-readout, .no-js .oscillator-lv__k { display: none; }
.no-js .oscillator-lv__grid { display: none; }

/* slider with a scale of thresholds */
.oscillator-scale { --thumb: 18px; position: relative; flex: 1 1 200px; min-width: 0; padding-bottom: 46px; }
.oscillator-scale input { -webkit-appearance: none; appearance: none; display: block; width: 100%; height: 36px; margin: 0; background: transparent; cursor: pointer; }
.oscillator-scale input:focus { outline: none; }
.oscillator-scale input::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: var(--line-2); }
.oscillator-scale input::-moz-range-track { height: 4px; border-radius: 2px; background: var(--line-2); }
.oscillator-scale input::-webkit-slider-thumb { -webkit-appearance: none; width: var(--thumb); height: var(--thumb); margin-top: -7px; border-radius: 50%; background: var(--ink); border: 3px solid var(--bg-deep); box-shadow: 0 0 0 1px var(--ink-3); }
.oscillator-scale input::-moz-range-thumb { width: var(--thumb); height: var(--thumb); border-radius: 50%; background: var(--ink); border: 3px solid var(--bg-deep); box-sizing: border-box; }
.oscillator-scale input:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 2px var(--amber); }
.oscillator-scale input:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 2px var(--amber); }
.oscillator-scale__marks { position: absolute; left: 0; right: 0; top: 18px; height: 46px; pointer-events: none; }
.oscillator-scale__marks > span { position: absolute; left: calc(var(--thumb) / 2 + var(--x) * (100% - var(--thumb))); transform: translateX(-50%); white-space: nowrap; }
.oscillator-scale__tk { top: 28px; font: 400 10.5px/1 var(--font-mono); color: var(--ink-3); }
.oscillator-scale__th { top: -8px; width: 2px; height: 14px; background: var(--c, var(--ink-2)); opacity: 0.45; transition: opacity 0.2s; }
.oscillator-scale__th i { position: absolute; top: 18px; left: 50%; transform: translateX(-50%); font: 500 10.5px/1 var(--font-mono); font-style: normal; color: var(--c); opacity: 0; transition: opacity 0.2s; }
.oscillator-scale__th--ni { --c: var(--ni); }
.oscillator-scale__th--ph { --c: var(--ph); }
.oscillator-scale__th--pd { --c: var(--pd); }
.oscillator-scale__th.is-on { opacity: 1; height: 18px; top: -10px; }
.oscillator-scale__th.is-on i { opacity: 1; }
@media (max-width: 640px) {
  .oscillator-ctl__slider { flex-wrap: wrap; }
  .oscillator-ctl__slider .oscillator-ctl__k { flex-basis: 100%; padding-top: 0; }
  .oscillator-ctl__out { padding-top: 10px; }
}

/* ---------- plots (drawn by oscillator.js) ---------- */
.oscillator-plot { position: relative; min-height: 300px; touch-action: pan-y; }
.oscillator-plot:focus-visible { outline-offset: -3px; }
.oscillator-plot svg { display: block; width: 100%; height: auto; overflow: visible; }
.oscillator-grid { stroke: var(--line); stroke-width: 1; }
.oscillator-zero { stroke: var(--line-2); stroke-width: 1; }
.oscillator-axis { stroke: var(--line-2); stroke-width: 1; }
.oscillator-tick { font: 400 11px var(--font-mono); fill: var(--ink-3); font-variant-numeric: tabular-nums; }
.oscillator-axl { font: 500 11px var(--font-mono); fill: var(--ink-2); letter-spacing: 0.03em; }
.oscillator-lab { font: 500 12px var(--font-mono); fill: var(--ink); }
.oscillator-lab--sub { font-weight: 400; fill: var(--ink-3); font-size: 11px; }
.oscillator-lab--ni { fill: var(--ni); }
.oscillator-lab--ph { fill: var(--ph); }
.oscillator-lab--pd { fill: var(--pd); }
.oscillator-line { fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.oscillator-line--ni { stroke: var(--ni); }
.oscillator-line--ph { stroke: var(--ph); }
.oscillator-line--pd { stroke: var(--pd); }
.oscillator-line--dash { stroke-width: 1.4; stroke-dasharray: 5 5; }
.oscillator-line--harm { stroke: var(--ink-3); stroke-width: 1.3; stroke-dasharray: 2 4; }
.oscillator-line--ghost { stroke-width: 1.3; stroke-dasharray: 3 5; opacity: 0.5; }
.oscillator-line--trace { stroke-width: 1.1; }
.oscillator-lvl { stroke-width: 2.2; stroke-linecap: round; }
.oscillator-lvl--ni { stroke: var(--ni); }
.oscillator-lvl--ph { stroke: var(--ph); }
.oscillator-lvl--pd { stroke: var(--pd); }
.oscillator-lvl--harm { stroke: var(--ink-3); stroke-width: 1.6; stroke-dasharray: 4 3; }
.oscillator-gapline { stroke: var(--ink-3); stroke-width: 1; }
.oscillator-pt { stroke: var(--bg-deep); stroke-width: 2; pointer-events: none; }
.oscillator-pt--ni { fill: var(--ni); }
.oscillator-pt--ph { fill: var(--ph); }
.oscillator-pt--pd { fill: var(--pd); }
.oscillator-hit { fill: transparent; cursor: default; }
.oscillator-hit:focus { outline: none; }
.oscillator-hit:focus-visible { stroke: var(--amber); stroke-width: 2; }
.oscillator-cross { stroke: var(--ink-3); stroke-width: 1; pointer-events: none; }
.oscillator-crossdot { stroke: var(--bg-deep); stroke-width: 2; pointer-events: none; }
.oscillator-hatch-bg { fill: url(#oscillator-hatch); }
.oscillator-hatch-line { stroke: var(--line-2); stroke-width: 1; }
.oscillator-env { fill: none; stroke: var(--ink-2); stroke-width: 1; stroke-dasharray: 3 4; }
.oscillator-clipnote { font: 500 11px var(--font-mono); fill: var(--ink-2); }
.oscillator-leader { stroke: var(--ink-3); stroke-width: 1; }

.oscillator-tip { position: fixed; z-index: 300; max-width: 300px; padding: 9px 11px; background: var(--paper-2); color: var(--paper-ink); font: 400 12.5px/1.45 var(--font-mono); border-radius: 4px; box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45); pointer-events: none; opacity: 0; transform: translateY(4px); transition: opacity 0.12s, transform 0.12s; }
.oscillator-tip.is-on { opacity: 1; transform: none; }
.oscillator-tip b { font-weight: 600; }

/* ---------- readouts and keys ---------- */
.oscillator-readout { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 28px; padding: 12px 16px; border-top: 1px solid var(--line); }
.oscillator-readout__i { font: 400 13px/1.55 var(--font-mono); color: var(--ink-2); max-width: 80ch; }
.oscillator-readout__i b { color: var(--ink); font-weight: 500; font-variant-numeric: tabular-nums; }
.oscillator-readout__i .is-grow { color: var(--amber); }
.oscillator-readout__legend { font: 400 12px/1.4 var(--font-mono); color: var(--ink-3); display: flex; align-items: center; gap: 6px 18px; flex-wrap: wrap; margin-left: auto; }
.oscillator-readout__legend--left { margin-left: 0; }
.oscillator-li { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.oscillator-key { display: inline-block; flex: none; width: 18px; height: 3px; vertical-align: middle; background: var(--ink-2); border-radius: 1px; }
.oscillator-key--ni { background: var(--ni); }
.oscillator-key--ph { background: var(--ph); }
.oscillator-key--pd { background: var(--pd); }
.oscillator-key--mat { background: var(--mat, var(--pd)); }
.oscillator-key--dash { height: 2px; background: repeating-linear-gradient(90deg, var(--mat, var(--pd)) 0 4px, transparent 4px 8px); }
.oscillator-key--harm { height: 2px; background: repeating-linear-gradient(90deg, var(--ink-3) 0 4px, transparent 4px 7px); }
.oscillator-key--ghost { height: 2px; background: repeating-linear-gradient(90deg, var(--ink-3) 0 3px, transparent 3px 7px); }
.oscillator-key--hatch { width: 16px; height: 12px; background: repeating-linear-gradient(135deg, var(--line-2) 0 1px, transparent 1px 5px); border: 1px solid var(--line); }
.oscillator-key--fill, .oscillator-key--ring, .oscillator-key--old { width: 11px; height: 11px; border-radius: 50%; }
.oscillator-key--fill { background: var(--ink); }
.oscillator-key--ring { background: transparent; border: 2px solid var(--ink); }
.oscillator-key--old { background: var(--bg-deep); border: 2px solid var(--old); }
.oscillator-key--tick { width: 3px; height: 14px; background: var(--meas); }
@media (max-width: 640px) { .oscillator-readout__legend { margin-left: 0; } }

/* ---------- 05.2 levels ---------- */
.oscillator-lv { --mat: var(--pd); }
.oscillator-lv[data-mat="NiH"] { --mat: var(--ni); }
.oscillator-lv[data-mat="PdH"] { --mat: var(--ph); }
.oscillator-lv__grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); }
.oscillator-lv__panel { padding: 14px 16px 6px; min-width: 0; }
.oscillator-lv__panel--ladder { border-left: 1px solid var(--line); }
.oscillator-lv__k { font: 500 11px/1.3 var(--font-mono); color: var(--ink-3); letter-spacing: 0.04em; text-transform: uppercase; }
.oscillator-plot--ladder { min-height: 280px; }
@media (max-width: 860px) {
  .oscillator-lv__grid { grid-template-columns: 1fr; }
  .oscillator-lv__panel--ladder { border-left: 0; border-top: 1px solid var(--line); }
}

/* ---------- 05.3 against measured: dot chart ---------- */
.oscillator-meas__grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 64px); align-items: start; }
.oscillator-meas__prose { font-size: 16.5px; }
@media (max-width: 1060px) { .oscillator-meas__grid { grid-template-columns: 1fr; } .oscillator-meas__prose { max-width: 72ch; } }
.oscillator-dots__body { padding: 18px 16px 14px; }
.oscillator-dots__row { display: grid; grid-template-columns: 3.6em minmax(0, 1fr); align-items: center; gap: 12px; padding: 22px 0 26px; border-bottom: 1px solid var(--line); }
.oscillator-dots__row--ni { --c: var(--ni); }
.oscillator-dots__row--ph { --c: var(--ph); }
.oscillator-dots__row--pd { --c: var(--pd); }
.oscillator-dots__name { font: 500 13px/1 var(--font-mono); color: var(--c); }
.oscillator-dots__track { position: relative; height: 24px; margin-right: 18px; background: linear-gradient(var(--line), var(--line)) 0 50% / 100% 1px no-repeat; }
.oscillator-dots__gap { position: absolute; top: 50%; height: 4px; transform: translateY(-50%); background: color-mix(in srgb, var(--c) 45%, transparent); border-radius: 2px; }
.oscillator-dots__pt, .oscillator-dots__meas { position: absolute; top: 50%; transform: translate(-50%, -50%); }
.oscillator-dots__pt { width: 14px; height: 14px; border-radius: 50%; }
.oscillator-dots__pt--coll { background: var(--c); box-shadow: 0 0 0 3px var(--bg-deep); z-index: 2; }
.oscillator-dots__pt--single { border: 2px solid var(--c); background: var(--bg-deep); }
.oscillator-dots__meas { width: 3px; height: 20px; background: var(--meas); border-radius: 1px; z-index: 1; }
.oscillator-dots__lab { position: absolute; bottom: calc(100% + 6px); left: 50%; transform: translateX(-50%); font: 500 12px/1 var(--font-mono); color: var(--ink); white-space: nowrap; font-variant-numeric: tabular-nums; }
.oscillator-dots__lab--below { bottom: auto; top: calc(100% + 5px); color: var(--ink-2); }
.oscillator-dots__lab i { font-style: normal; color: var(--ink-3); font-weight: 400; }
.oscillator-dots__axis { position: relative; height: 20px; margin: 12px 18px 0 calc(3.6em + 12px); border-top: 1px solid var(--line-2); }
.oscillator-dots__axis span { position: absolute; top: 6px; transform: translateX(-50%); font: 400 11px/1 var(--font-mono); color: var(--ink-3); }
.oscillator-dots__axl { margin: 4px 18px 0 0; text-align: right; font: 500 11px/1 var(--font-mono); color: var(--ink-2); letter-spacing: 0.03em; }
@media (max-width: 560px) {
  .oscillator-dots__lab i { display: none; }
  .oscillator-dots__row { grid-template-columns: 1fr; gap: 8px; padding: 14px 0 26px; }
  .oscillator-dots__name { margin-bottom: 14px; }
  .oscillator-dots__track { margin: 0 14px 0 4px; }
  .oscillator-dots__axis { margin: 12px 14px 0 4px; }
  .oscillator-dots__axl { margin-right: 14px; }
  .oscillator-dots__pt--single .oscillator-dots__lab { bottom: auto; top: calc(100% + 6px); color: var(--ink-2); }
}

/* ---------- H against D number line ---------- */
.oscillator-hd { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 28px clamp(32px, 5vw, 80px); align-items: center; margin-top: clamp(56px, 7vw, 104px); padding-top: clamp(28px, 3vw, 40px); border-top: 1px solid var(--line); }
.oscillator-hd__k { font: 500 12px/1.3 var(--font-mono); color: var(--amber); letter-spacing: 0.03em; }
.oscillator-hd__h { font: 400 clamp(28px, 3vw, 44px)/1.02 var(--font-display); letter-spacing: -0.035em; margin-top: 12px; }
.oscillator-hd__p { font: 400 16.5px/1.6 var(--font-text); color: var(--ink-2); margin-top: 14px; max-width: 54ch; }
.oscillator-hd__line { padding: 64px 12px 8px; min-width: 0; }
.oscillator-hd__track { position: relative; height: 2px; background: var(--line-2); margin-bottom: 60px; }
.oscillator-hd__mk { position: absolute; top: 50%; width: 12px; height: 12px; border-radius: 50%; transform: translate(-50%, -50%); }
.oscillator-hd__mk--harm { background: var(--bg); border: 2px solid var(--ink-3); }
.oscillator-hd__mk--meas { width: 3px; height: 30px; border-radius: 1px; background: var(--meas); }
.oscillator-hd__mk--single { border: 2px solid var(--pd); background: var(--bg); }
.oscillator-hd__mk--coll { background: var(--pd); }
.oscillator-hd__lab { position: absolute; left: 50%; transform: translateX(-50%); display: grid; gap: 4px; text-align: center; font: 400 clamp(20px, 2vw, 28px)/1 var(--font-display); letter-spacing: -0.03em; color: var(--ink); white-space: nowrap; }
.oscillator-hd__lab i { font: 400 11px/1.2 var(--font-mono); font-style: normal; letter-spacing: 0.02em; color: var(--ink-3); }
.oscillator-hd__lab--up { bottom: calc(100% + 10px); }
.oscillator-hd__lab--down { top: calc(100% + 10px); }
.oscillator-hd__lab--end { transform: translateX(-100%); text-align: right; left: calc(50% + 4px); }
.oscillator-hd__lab--start { transform: none; text-align: left; left: calc(50% - 6px); }
.oscillator-hd__mk--harm .oscillator-hd__lab { color: var(--ink-2); }
.oscillator-hd__axis { position: relative; height: 20px; border-top: 1px solid var(--line); }
.oscillator-hd__axis span { position: absolute; top: 6px; transform: translateX(-50%); font: 400 11px/1 var(--font-mono); color: var(--ink-3); }
.oscillator-hd__axl { font: 500 11px/1.3 var(--font-mono); color: var(--ink-2); letter-spacing: 0.03em; margin-top: 8px; text-align: right; }
@media (max-width: 980px) { .oscillator-hd { grid-template-columns: 1fr; } }
@media (max-width: 520px) {
  .oscillator-hd__lab { font-size: 18px; }
  .oscillator-hd__lab i { font-size: 10px; }
  .oscillator-hd__line { padding-left: 0; padding-right: 0; }
}

/* ---------- 05.4 before and after ---------- */
.oscillator-rerun__intro .lead { margin-top: 0; }
.oscillator-rerun__p { font: 400 16px/1.6 var(--font-text); color: var(--ink-2); margin-top: 16px; max-width: 56ch; }
.oscillator-ba { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px clamp(28px, 4vw, 64px); }
.oscillator-ba__fig { margin: 0; min-width: 0; padding: 18px 18px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg-deep); }
.oscillator-ba__h { font: 500 11.5px/1.4 var(--font-mono); color: var(--ink-2); letter-spacing: 0.03em; text-transform: uppercase; }
.oscillator-ba__h .oscillator-m { text-transform: none; }
.oscillator-ba__body { position: relative; margin-top: 30px; }
.oscillator-ba__row { display: grid; grid-template-columns: 3.4em minmax(0, 1fr); align-items: center; gap: 12px; height: 56px; }
.oscillator-ba__name { font: 500 13px/1 var(--font-mono); color: var(--ink); }
.oscillator-ba__track { position: relative; height: 20px; margin-right: 16px; }
.oscillator-ba__zl { position: absolute; top: -18px; bottom: -18px; width: 0; border-left: 1px dashed var(--ink-3); }
.oscillator-ba__zl i { position: absolute; top: -14px; left: 0; transform: translateX(-50%); font: 400 10.5px/1 var(--font-mono); font-style: normal; color: var(--ink-3); white-space: nowrap; }
.oscillator-ba__link { position: absolute; top: 50%; height: 3px; transform: translateY(-50%); border-radius: 2px; opacity: 0.55; }
.oscillator-ba__link--ni { background: var(--ni); }
.oscillator-ba__link--ph { background: var(--ph); }
.oscillator-ba__link--pd { background: var(--pd); }
.oscillator-ba__old, .oscillator-ba__new { position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%; transform: translate(-50%, -50%); }
.oscillator-ba__old { background: var(--bg-deep); border: 2px solid var(--old); }
.oscillator-ba__new { box-shadow: 0 0 0 3px var(--bg-deep); }
.oscillator-ba__new--ni { background: var(--ni); }
.oscillator-ba__new--ph { background: var(--ph); }
.oscillator-ba__new--pd { background: var(--pd); }
.oscillator-ba__v { position: absolute; bottom: calc(100% + 5px); left: 50%; transform: translateX(-50%); font: 500 12px/1 var(--font-mono); color: var(--ink); white-space: nowrap; font-variant-numeric: tabular-nums; }
.oscillator-ba__old .oscillator-ba__v { color: var(--ink-3); font-weight: 400; }
.oscillator-ba__old--below .oscillator-ba__v { bottom: auto; top: calc(100% + 5px); }
.oscillator-ba__axis { position: relative; height: 20px; margin: 8px 16px 0 calc(3.4em + 12px); border-top: 1px solid var(--line-2); }
.oscillator-ba__axis span { position: absolute; top: 6px; transform: translateX(-50%); font: 400 11px/1 var(--font-mono); color: var(--ink-3); }
.oscillator-ba__foot { grid-column: 1 / -1; display: grid; gap: 14px; }
.oscillator-ba__note { font: 400 13px/1.7 var(--font-mono); color: var(--ink-2); max-width: 110ch; }
.oscillator-ba__note .chip { margin-left: 2px; }
@media (max-width: 900px) { .oscillator-ba { grid-template-columns: 1fr; } }

/* ---------- 05.5 stretch ---------- */
.oscillator-stretch__grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 64px); align-items: start; }
.oscillator-ord__k { font: 500 11.5px/1.45 var(--font-mono); color: var(--ink-3); letter-spacing: 0.03em; }
.oscillator-ord__t { width: 100%; border-collapse: collapse; margin-top: 10px; }
.oscillator-ord__t th, .oscillator-ord__t td { text-align: right; padding: 10px 0 10px 12px; border-bottom: 1px solid var(--line); }
.oscillator-ord__t thead th { font: 500 11px/1.3 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; vertical-align: bottom; }
.oscillator-ord__t tbody th { text-align: left; padding-left: 0; font: 500 13px/1 var(--font-mono); color: var(--ink); white-space: nowrap; }
.oscillator-ord__t tbody th .oscillator-key { margin-right: 8px; }
.oscillator-ord__t td { font: 400 clamp(28px, 2.8vw, 42px)/1 var(--font-display); letter-spacing: -0.035em; color: var(--ink); font-variant-numeric: tabular-nums; }
.oscillator-ord__t td + td { color: var(--ink-2); }
.oscillator-stretch__prose { margin-top: 28px; font-size: 16.5px; }
.oscillator-pointer { font-size: 15px; color: var(--ink-3); border-left: 2px solid var(--line-2); padding-left: 14px; }
.oscillator-pointer a { color: var(--ink-2); }
@media (max-width: 980px) { .oscillator-stretch__grid { grid-template-columns: 1fr; } }

/* ---------- 05.6 pump ---------- */
.oscillator-pump__grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(28px, 4vw, 64px); align-items: start; margin-bottom: clamp(32px, 4vw, 56px); }
.oscillator-swing__svg { width: 100%; max-width: 440px; height: auto; margin: 6px auto 4px; padding: 0 8px; overflow: visible; }
.oscillator-swing__pivot { fill: var(--ink-2); }
.oscillator-swing__arc { fill: none; stroke: var(--line-2); stroke-width: 1; stroke-dasharray: 3 5; }
.oscillator-swing__rope { stroke: var(--ink-3); stroke-width: 1.4; }
.oscillator-swing__rope.is-mid { stroke: var(--ink-2); }
.oscillator-swing__seat { stroke: var(--ink-2); stroke-width: 3; stroke-linecap: round; }
.oscillator-swing__body { stroke: var(--crimson-ink); stroke-width: 6; stroke-linecap: round; }
.oscillator-swing__body.is-stand { stroke: var(--amber); }
.oscillator-swing__head { fill: var(--crimson-ink); }
.oscillator-swing__head.is-stand { fill: var(--amber); }
.oscillator-swing__cm { fill: var(--bg); stroke: var(--ink); stroke-width: 1.5; }
.oscillator-swing__t { font: 500 12px var(--font-mono); fill: var(--crimson-ink); }
.oscillator-swing__t.is-stand { fill: var(--amber); }
.oscillator-swing__t--sub { font-weight: 400; font-size: 11px; fill: var(--ink-3); }
.oscillator-swing__t--k { font-weight: 400; font-size: 11px; fill: var(--ink-2); }
.oscillator-swing__t--tiny { font-weight: 400; font-size: 10px; fill: var(--ink-3); }
.oscillator-swing__ax { stroke: var(--line); stroke-width: 1; }
.oscillator-swing__guide { stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 3; }
.oscillator-swing__w1 { fill: none; stroke: var(--ink-2); stroke-width: 1.6; }
.oscillator-swing__w2 { fill: none; stroke: var(--amber); stroke-width: 1.8; }
.oscillator-pump__text .prose { font-size: 16.5px; }
.oscillator-pump__table { margin: 24px 0 0; }
.oscillator-plot--par { min-height: 260px; }
@media (max-width: 980px) { .oscillator-pump__grid { grid-template-columns: 1fr; } .oscillator-swing { max-width: 560px; } }

/* ---------- tables ---------- */
.oscillator-table td { font-variant-numeric: tabular-nums; min-width: 0; }
.oscillator-table td:first-child { min-width: 0; }
.oscillator-table th { white-space: normal; }
.oscillator-table th .oscillator-m { font-family: var(--font-text); font-size: 13px; font-weight: 400; }
.oscillator-table th .oscillator-u { color: var(--ink-3); }
.oscillator-table tr.is-total td { color: var(--ink); border-top: 1px solid var(--line-2); }
.oscillator-table .oscillator-key { margin-right: 4px; }

/* ---------- 05.7 detail ---------- */
.oscillator-detail__cols { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 88px); align-items: start; }
.oscillator-detail__eqs .oscillator-h4 { margin-top: 34px; }
.oscillator-detail__eqs .oscillator-h4:first-child { margin-top: 0; }
.oscillator-eq { display: flex; align-items: baseline; gap: 18px; margin-top: 14px; padding: 16px 18px; background: var(--bg-raise); border-left: 2px solid var(--crimson); border-radius: 0 6px 6px 0; overflow-x: auto; }
.oscillator-eq__n { font: 500 12px/1 var(--font-mono); color: var(--crimson-ink); flex: none; }
.oscillator-eq__f { font: 400 clamp(18px, 1.65vw, 24px)/1.5 var(--font-text); color: var(--ink); letter-spacing: 0.005em; white-space: nowrap; }
.oscillator-eq__f sub, .oscillator-eq__f sup { font-size: 0.62em; }
.oscillator-def { font: 400 15.5px/1.65 var(--font-text); color: var(--ink-2); margin-top: 12px; max-width: 74ch; }
.oscillator-def i, .oscillator-note i { color: var(--ink); }
.oscillator-spec { display: grid; margin-top: 14px; border-top: 1px solid var(--line); }
.oscillator-spec div { display: grid; grid-template-columns: 8.5em minmax(0, 1fr); gap: 14px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.oscillator-spec dt { font: 500 11.5px/1.5 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.03em; }
.oscillator-spec dd { margin: 0; font: 400 13.5px/1.55 var(--font-mono); color: var(--ink-2); }
.oscillator-tables { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 3vw, 48px) clamp(24px, 3vw, 48px); margin-top: clamp(56px, 6vw, 96px); padding-top: clamp(32px, 4vw, 56px); border-top: 1px solid var(--line); }
.oscillator-tables__i { min-width: 0; }
.oscillator-tables__i .table-wrap { margin: 14px 0 0; }
.oscillator-note { font: 400 12.5px/1.6 var(--font-mono); color: var(--ink-3); margin-top: 10px; max-width: 72ch; }
@media (max-width: 980px) { .oscillator-detail__cols, .oscillator-tables { grid-template-columns: 1fr; } }
@media (max-width: 520px) {
  .oscillator-spec div { grid-template-columns: 1fr; gap: 4px; }
  .oscillator-eq { padding: 14px 12px; gap: 10px; }
}

/* ---------- next ---------- */
.oscillator-next__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 88px); align-items: start; }
.oscillator-next__lead { margin-top: 24px; }
@media (max-width: 900px) { .oscillator-next__grid { grid-template-columns: 1fr; } }

/* grid children may shrink below their content (tables and equations scroll or wrap inside) */
:is(.oscillator-short__grid, .oscillator-meas__grid, .oscillator-stretch__grid, .oscillator-pump__grid, .oscillator-detail__cols, .oscillator-next__grid, .oscillator-head--split, .oscillator-hd, .oscillator-ba) > * { min-width: 0; }
@media (max-width: 700px) { .oscillator-eq__f { white-space: normal; } }