/* ---------- project page extras ---------- */
.viz {
  --s-bear: #eb6834;   /* bearings      (cat. slot 2) */
  --s-elec: #2a78d6;   /* electronics   (cat. slot 1) */
  --s-mech: #1baf7a;   /* other mech.   (cat. slot 3) */
  --b1: #fbd3bf; --b2: #f6a57f; --b3: #eb6834; --b4: #b8461c; --b5: #7a2c10;
  --sel: #eb6834;
  --bar: #c9c8c2;
}
:root[data-theme="dark"] .viz {
  --s-bear: #d95926;
  --s-elec: #3987e5;
  --s-mech: #199e70;
  --b1: #5a2410; --b2: #8f3a17; --b3: #d95926; --b4: #f08a5d; --b5: #f7b99a;
  --sel: #f07a50;
  --bar: #3a3a38;
}

.p-actions { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 30px; }

.hero-img { margin-top: 40px; }
.hero-img img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; }
figcaption.cap { padding-top: 10px; display: flex; justify-content: space-between; gap: 16px; }

.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--faint); border-bottom: 1px solid var(--faint);
  margin-top: 72px;
}
.stats div { padding: 26px 20px 24px 0; }
.stats div + div { padding-left: 20px; border-left: 1px solid var(--line); }
.stats b {
  display: block;
  font-weight: 700; font-stretch: 72%;
  font-size: clamp(40px, 5vw, 60px); line-height: 1;
  margin-bottom: 10px;
}
.stats span.mono { line-height: 1.5; display: block; max-width: 200px; }

.chapter { padding-top: 112px; }
.chapter .sec-head { margin-bottom: 0; }
.lede { display: grid; grid-template-columns: 200px 1fr; gap: 24px; padding-top: 28px; }
.lede p { font-size: 18px; line-height: 1.6; color: var(--dim); max-width: 640px; }
.lede p + p { margin-top: 14px; }
.lede p strong { color: var(--ink); font-weight: 500; }

.gallery { display: grid; gap: 12px; margin-top: 40px; }
.gallery.g3 { grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; }
.gallery.g3 figure:first-child { grid-row: span 2; }
.gallery.g4 { grid-template-columns: repeat(4, 1fr); }
.gallery.g2 { grid-template-columns: 1fr 1fr; }
.gallery figure { overflow: hidden; }
.gallery img { width: 100%; height: 100%; object-fit: cover; }
.gallery.g4 img { aspect-ratio: 1 / 1; }
.gallery.g2 img { aspect-ratio: 4 / 3; }

/* paper panel for line drawings: same in both themes, like a print on the desk */
.paper {
  background: #fff; color: #131513;
  border: 1px solid var(--faint);
  position: relative;
}
.paper img { width: 100%; }

/* ---------- exploded view ---------- */
.explode { margin-top: 40px; }
.explode .stage { position: relative; padding: 4% 3%; }
.hot-pt {
  position: absolute; transform: translate(-50%, -50%);
  width: 30px; height: 30px; border-radius: 50%;
  border: none; background: transparent; cursor: pointer;
  display: grid; place-items: center;
}
.hot-pt::before {
  content: ""; width: 14px; height: 14px; border-radius: 50%;
  background: var(--c); box-shadow: 0 0 0 2px #fff;
  transition: transform .2s;
}
.hot-pt::after {
  content: ""; position: absolute; inset: 3px; border-radius: 50%;
  border: 1.5px solid var(--c); opacity: 0; transition: opacity .2s;
}
.hot-pt:hover::before, .hot-pt.on::before { transform: scale(1.15); }
.hot-pt:hover::after, .hot-pt.on::after { opacity: 1; }
.hot-pt:focus-visible { outline: 2px solid var(--c); outline-offset: 2px; }
.explode.filtered .hot-pt:not(.match) { opacity: .2; }

.explode-ui { display: grid; grid-template-columns: 1fr 1.2fr; gap: 24px; margin-top: 18px; align-items: start; }
.legend { display: flex; flex-wrap: wrap; gap: 8px; }
.legend button {
  display: inline-flex; align-items: center; gap: 10px;
  background: none; color: var(--ink); cursor: pointer;
  border: 1px solid var(--faint); padding: 9px 12px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .04em;
  transition: border-color .2s;
}
.legend button:hover, .legend button[aria-pressed="true"] { border-color: var(--ink); }
.legend i { width: 10px; height: 10px; border-radius: 50%; background: var(--c); display: inline-block; }
.legend b { font-weight: 500; color: var(--dim); }
.part-info { border-left: 2px solid var(--c, var(--faint)); padding: 2px 0 2px 18px; min-height: 96px; }
.part-info h4 { font-size: 20px; font-weight: 600; margin: 6px 0 6px; }
.part-info p { color: var(--dim); font-size: 15px; line-height: 1.55; }

/* ---------- diagnosis explorer ---------- */
.lab { margin-top: 40px; border: 1px solid var(--faint); }
.lab-top {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 14px 18px; border-bottom: 1px solid var(--faint);
}
.seg { display: inline-flex; border: 1px solid var(--faint); }
.seg button {
  background: none; border: 0; color: var(--dim); cursor: pointer;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase;
  padding: 8px 12px;
}
.seg button + button { border-left: 1px solid var(--faint); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.lab-body { display: grid; grid-template-columns: 250px 1fr; }
.scen { list-style: none; border-right: 1px solid var(--faint); padding: 8px 0; }
.scen button {
  width: 100%; text-align: left; background: none; border: 0; color: var(--ink); cursor: pointer;
  display: grid; grid-template-columns: 34px 1fr; gap: 8px; align-items: baseline;
  padding: 10px 18px; font-family: var(--sans); font-size: 15px;
  border-left: 2px solid transparent;
}
.scen button:hover { background: var(--surface); }
.scen button[aria-pressed="true"] { border-left-color: var(--sel); background: var(--surface); }
.scen .id { font-family: var(--mono); font-size: 11px; color: var(--dim); }
.scen .ok { color: var(--dim); font-size: 13px; }

.scope { padding: 18px; display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.readout { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.readout div { display: flex; flex-direction: column; gap: 6px; }
.readout b { font-family: var(--mono); font-weight: 500; font-size: 22px; letter-spacing: -.01em; }
.readout b.up { color: var(--sel); }
.canvas-wrap { position: relative; height: 170px; background: var(--surface); }
.canvas-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.canvas-wrap .mono { position: absolute; left: 10px; top: 8px; }
.bands-bar { display: flex; height: 22px; gap: 2px; }
.bands-bar span { height: 100%; transition: flex-basis .5s cubic-bezier(.2,.8,0,1); min-width: 0; }
.bands-bar span:first-child { border-radius: 4px 0 0 4px; }
.bands-bar span:last-child { border-radius: 0 4px 4px 0; }
.bands-legend { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 10px; }
.bands-legend div { display: flex; flex-direction: column; gap: 4px; }
.bands-legend .k { display: flex; align-items: center; gap: 6px; }
.bands-legend i { width: 9px; height: 9px; border-radius: 2px; display: inline-block; }
.bands-legend b { font-family: var(--mono); font-weight: 500; font-size: 13px; }
.note { color: var(--dim); font-size: 14px; line-height: 1.5; border-top: 1px solid var(--line); padding-top: 14px; }

.rms-chart { border-top: 1px solid var(--faint); padding: 18px; }
.rms-chart .head { display: flex; justify-content: space-between; margin-bottom: 14px; gap: 12px; }
.rms-rows { position: relative; display: grid; gap: 6px; }
.rms-row {
  display: grid; grid-template-columns: 34px 1fr 70px; gap: 12px; align-items: center;
  background: none; border: 0; color: var(--ink); cursor: pointer; padding: 3px 0; text-align: left;
}
.rms-row .track { position: relative; height: 14px; }
.rms-row .fill { position: absolute; left: 0; top: 0; bottom: 0; background: var(--bar); border-radius: 0 4px 4px 0; transition: width .5s cubic-bezier(.2,.8,0,1), background .2s; }
.rms-row.on .fill { background: var(--sel); }
.rms-row:hover .fill { filter: brightness(1.15); }
.rms-row .v { font-family: var(--mono); font-size: 12px; text-align: right; color: var(--dim); }
.rms-row.on .v { color: var(--ink); }
.baseline {
  position: absolute; top: -4px; bottom: -4px; width: 0;
  border-left: 1.5px dashed var(--ink); opacity: .55; pointer-events: none;
}
.baseline span { position: absolute; top: -18px; left: 6px; white-space: nowrap; }

.findings { list-style: none; counter-reset: f; margin-top: 8px; }
.findings li {
  display: grid; grid-template-columns: 200px 1fr; gap: 24px;
  padding: 22px 0; border-bottom: 1px solid var(--line);
}
.findings h3 { font-size: 20px; font-weight: 600; line-height: 1.3; }
.findings p { color: var(--dim); font-size: 16px; line-height: 1.6; max-width: 640px; }

.steps { list-style: none; display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 28px; }
.steps li { border-top: 1px solid var(--ink); padding-top: 12px; }
.steps b { display: block; font-size: 16px; font-weight: 600; margin: 8px 0 6px; }
.steps p { color: var(--dim); font-size: 14px; line-height: 1.5; }

.split { display: grid; grid-template-columns: 1.3fr 1fr; gap: 12px; margin-top: 40px; align-items: stretch; }
.split .paper { display: grid; place-items: center; }

@media (max-width: 860px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .stats div:nth-child(3) { border-left: 0; padding-left: 0; }
  .stats div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .lede, .findings li { grid-template-columns: 1fr; gap: 10px; }
  .gallery.g4 { grid-template-columns: 1fr 1fr; }
  .gallery.g3 { grid-template-columns: 1fr 1fr; }
  .gallery.g3 figure:first-child { grid-column: span 2; grid-row: auto; }
  .explode-ui { grid-template-columns: 1fr; }
  .lab-body { grid-template-columns: 1fr; }
  .scen { border-right: 0; border-bottom: 1px solid var(--faint); display: flex; overflow-x: auto; padding: 0; }
  .scen li { flex: 0 0 auto; }
  .scen button { border-left: 0; border-bottom: 2px solid transparent; grid-template-columns: auto auto; padding: 12px 14px; white-space: nowrap; }
  .scen button[aria-pressed="true"] { border-bottom-color: var(--sel); }
  .readout { grid-template-columns: 1fr 1fr; }
  .readout div:last-child { grid-column: span 2; }
  .bands-legend { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .hot-pt { width: 24px; height: 24px; }
  .hot-pt::before { width: 11px; height: 11px; }
}
@media (max-width: 520px) {
  .steps { grid-template-columns: 1fr; }
  .chapter { padding-top: 88px; }
}

/* fixes */
[hidden] { display: none !important; }
.hero-img img, .gallery img, .split img, .feature .img img { height: auto; }
.gallery img { height: 100%; }
.explode .stage { padding: 2% 3%; }
.explode .stage .inner { position: relative; }
.rms-rows { padding-bottom: 26px; }
.baseline { bottom: 18px; top: -4px; }
.baseline span { top: auto; bottom: -20px; left: 6px; }
.paper img { height: auto; display: block; }

/* drawings: white paper disappears into the page in both themes */
.drawing { background: var(--bg); }
.drawing img { mix-blend-mode: multiply; height: auto; display: block; width: 100%; }
:root[data-theme="dark"] .drawing img { filter: invert(1) hue-rotate(180deg); mix-blend-mode: screen; }
.drawing .hot-pt::before { box-shadow: 0 0 0 2px var(--bg); }
.split .drawing { display: grid; place-items: center; }

/* ---------- 3D viewer ---------- */
.m3d { margin-top: 40px; }
.m3d-stage {
  position: relative; aspect-ratio: 16 / 8;
  background: radial-gradient(ellipse at 50% 55%, var(--surface) 0%, var(--bg) 70%);
  border: 1px solid var(--faint);
  cursor: grab; overflow: hidden;
}
.m3d-stage:active { cursor: grabbing; }
.m3d-stage canvas { position: absolute; inset: 0; width: 100% !important; height: 100% !important; display: block; }
.m3d-status { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); }
.m3d-hint { position: absolute; left: 16px; bottom: 14px; transition: opacity .4s; pointer-events: none; }
.m3d:not(.ready) .m3d-hint, .m3d.touched .m3d-hint { opacity: 0; }
.m3d-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 12px; flex-wrap: wrap; }
.m3d-reset { background: none; border: 0; color: var(--dim); cursor: pointer; border-bottom: 1px solid var(--faint); padding: 4px 0; }
.m3d-reset:hover { color: var(--ink); border-color: var(--hot); }
@media (max-width: 860px) { .m3d-stage { aspect-ratio: 4 / 3; } }

/* ---------- process stepper ---------- */
.process { margin-top: 40px; border: 1px solid var(--faint); }
.process-tabs { display: grid; grid-template-columns: repeat(5, 1fr); border-bottom: 1px solid var(--faint); }
.process-tabs button {
  background: none; border: 0; cursor: pointer; color: var(--dim); text-align: left;
  padding: 14px 16px; display: flex; flex-direction: column; gap: 4px;
  font-family: var(--sans); font-size: 15px; font-weight: 500;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.process-tabs button + button { border-left: 1px solid var(--line); }
.process-tabs button:hover { color: var(--ink); }
.process-tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--hot); }
.process-tabs button[aria-selected="true"] .mono { color: var(--hot); }
.process-body { display: grid; grid-template-columns: 1.3fr 1fr; }
.process-img { overflow: hidden; background: var(--surface); }
.process-img img { width: 100%; height: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: opacity .15s; }
.process-txt { padding: 28px; display: flex; flex-direction: column; gap: 10px; justify-content: center; }
.process-txt h3 { font-size: 24px; font-weight: 600; font-stretch: 85%; }
.process-txt p { color: var(--dim); font-size: 16px; line-height: 1.6; }
@media (max-width: 860px) {
  .process-tabs { grid-template-columns: repeat(5, auto); overflow-x: auto; }
  .process-tabs button { white-space: nowrap; }
  .process-body { grid-template-columns: 1fr; }
}