/* CHYI FENG Technology — OEM / ODM program site
   Technical-drawing feel on white: thin grid, numbered stages, measured spacing, red stage marker. */

:root {
  --ink: #111111;
  --red: #E60012;
  --red-hover: #D60012;
  --red-active: #B8000E;
  --muted: #4B5563;
  --surface: #F7F8FA;
  --surface-2: #F2F3F5;
  --line: #E5E7EB;
  --line-strong: #C9CDD3;
  --field: #8A9099;
  --tint: #FFF4F4;
  --grid: rgba(17, 17, 17, 0.045);
  --font: "Inter", "Helvetica Neue", Helvetica, Arial, "Segoe UI", system-ui, sans-serif;
  --u: 8px;
  --wrap: 1232px;
  --pad: 32px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 96px; }
body {
  margin: 0;
  background: #FFFFFF;
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--red-active); }
h1, h2, h3, h4 { line-height: 1.18; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: 46px; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 34px; font-weight: 700; }
h3 { font-size: 22px; font-weight: 700; }
h4 { font-size: 15px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
p { margin: 0 0 16px; }
ul, ol { margin: 0; padding: 0; }
.nw { white-space: nowrap; }
:focus-visible { outline: 3px solid var(--red); outline-offset: 2px; border-radius: 2px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); }
.skip { position: absolute; left: 16px; top: -60px; background: #FFFFFF; color: var(--ink); padding: 8px 16px; border: 2px solid var(--red); z-index: 100; }
.skip:focus { top: 8px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- icons ---------- */
.ico { width: 18px; height: 18px; flex: none; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 48px; padding: 12px 22px;
  font: inherit; font-size: 16px; font-weight: 600; line-height: 1.2;
  text-decoration: none; border-radius: 2px; cursor: pointer;
  border: 1px solid transparent;
}
.btn-red { background: var(--red); color: #FFFFFF; border-color: var(--red); }
.btn-red:hover { background: var(--red-hover); border-color: var(--red-hover); color: #FFFFFF; }
.btn-red:active { background: var(--red-active); border-color: var(--red-active); }
.btn-line { background: #FFFFFF; color: var(--ink); border-color: var(--ink); }
.btn-line:hover { color: var(--ink); background: var(--surface); }
.btn-text { padding-left: 0; padding-right: 0; min-height: 40px; color: var(--ink); text-decoration: underline; text-underline-offset: 4px; font-weight: 600; }
.btn-small { min-height: 40px; padding: 8px 16px; font-size: 15px; }

/* ---------- labels / section heads ---------- */
.label {
  display: flex; align-items: center; gap: 12px;
  margin: 0 0 16px;
  font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
}
.label .rule { width: 28px; height: 5px; background: var(--red); flex: none; }
.label .num { color: var(--ink); }
.sec { padding: 88px 0; border-top: 1px solid var(--line); }
.sec-surface { background: var(--surface); }
.sec-head { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; align-items: end; margin-bottom: 40px; }
.sec-head p { color: var(--muted); margin: 0; max-width: 520px; }
.sec-head h2 { max-width: 720px; }

/* drawing grid surface */
.grid-bg {
  background-color: #FFFFFF;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
}

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: #FFFFFF; border-bottom: 1px solid var(--line); }
.util { border-bottom: 1px solid var(--line); font-size: 14px; color: var(--muted); }
.util-in { display: flex; justify-content: space-between; align-items: center; min-height: 36px; gap: 24px; }
.util-links { display: flex; gap: 24px; }
.util a { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; }
.util a:hover { color: var(--red-active); text-decoration: underline; }
.util .ico { width: 15px; height: 15px; }
.bar { display: flex; align-items: center; gap: 24px; min-height: 76px; }
.brand { display: block; flex: none; margin-left: -6px; }
.brand img { width: 204px; height: auto; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  position: relative; padding: 10px 12px; font-size: 16px; font-weight: 500;
  text-decoration: none; color: var(--ink); white-space: nowrap;
}
.nav a:hover { color: var(--red-active); }
.nav a[aria-current="page"]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 2px; height: 3px; background: var(--red); }
.head-cta { flex: none; }
.menu-btn {
  display: none; align-items: center; gap: 8px; margin-left: auto;
  min-height: 44px; padding: 8px 12px; background: #FFFFFF; color: var(--ink);
  border: 1px solid var(--field); border-radius: 2px; font: inherit; font-size: 15px; font-weight: 600; cursor: pointer;
}
.mobile-menu { border-top: 1px solid var(--line); background: #FFFFFF; }
.mobile-menu[hidden] { display: none; }
.mm-in { padding-top: 16px; padding-bottom: 24px; }
.mm-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.mm-top p { margin: 0; font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.mm-close { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 8px 12px; background: #FFFFFF; border: 1px solid var(--field); border-radius: 2px; font: inherit; font-size: 15px; font-weight: 600; color: var(--ink); cursor: pointer; }
.mm-nav a { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 19px; font-weight: 600; text-decoration: none; }
.mm-nav a[aria-current="page"] { box-shadow: inset 4px 0 0 var(--red); padding-left: 14px; }
.mm-contact { margin-top: 20px; display: grid; gap: 12px; }
.mm-contact a.plain { display: inline-flex; gap: 10px; align-items: center; text-decoration: none; font-size: 16px; }
.mm-contact .btn { justify-content: center; }

/* ---------- hero (drawing sheet) ---------- */
.hero { padding: 40px 0 72px; }
.sheet {
  position: relative; background: #FFFFFF; border: 1px solid var(--ink);
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  grid-template-areas: "copy photo" "schem tb";
}
.sheet > .fig { border: 0; }
.sheet > .fig-photo { grid-area: photo; }
.sheet > .fig-schem { grid-area: schem; border-top: 1px solid var(--ink); border-right: 1px solid var(--line-strong); }
.sheet > .fig .fig-media { padding: 28px; }
.sheet > .fig-photo img { width: 100%; max-width: 460px; }
.sheet > .fig-schem img { width: 100%; max-width: 620px; }
.ruler {
  position: absolute; left: 0; right: 0; top: 0; height: 10px; pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(to right, var(--ink) 0 1px, transparent 1px 64px);
  background-size: 100% 6px, 100% 10px;
  background-repeat: no-repeat;
}
.hero-copy { grid-area: copy; padding: 44px 48px 40px; border-right: 1px solid var(--line-strong); }
.hero-copy h1 { max-width: 700px; margin-bottom: 20px; }
.hero-copy .lead { font-size: 19px; color: var(--muted); max-width: 640px; margin-bottom: 28px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero-note { margin: 20px 0 0; font-size: 15px; color: var(--muted); display: flex; gap: 8px; align-items: center; }
.hero-note .ico { color: var(--red); }

.title-block { grid-area: tb; margin: 0; padding: 36px 32px 32px; align-self: stretch; border-top: 1px solid var(--ink); }
.tb-title { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding-bottom: 10px; border-bottom: 2px solid var(--ink); margin-bottom: 4px; }
.tb-title strong { font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; }
.tb-title span { font-size: 13px; color: var(--muted); }
.tb-row { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--line-strong); font-size: 15px; line-height: 1.45; }
.tb-row dt { font-weight: 700; color: var(--muted); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; padding-top: 1px; }
.tb-row dd { margin: 0; }


/* ---------- figures ---------- */
.fig { margin: 0; background: #FFFFFF; border: 1px solid var(--line-strong); display: flex; flex-direction: column; }
.fig-media { flex: 1; display: flex; align-items: center; justify-content: center; padding: 20px; min-height: 0; background: #FFFFFF; }
.fig-media img { object-fit: contain; }
.fig figcaption { display: flex; gap: 12px; align-items: baseline; padding: 12px 16px; border-top: 1px solid var(--line); font-size: 14px; line-height: 1.45; color: var(--muted); }
.fig-no { flex: none; font-weight: 700; color: var(--ink); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; border: 1px solid var(--ink); padding: 1px 6px; }

/* ---------- stage navigator ---------- */
.path { padding: 88px 0; border-top: 1px solid var(--line); }
.stages li { display: flex; }
.stages { list-style: none; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); position: relative; border: 1px solid var(--ink); border-bottom: 0; background: #FFFFFF; }
.stage-tab {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 6px; width: 100%;
  min-height: 132px; height: 100%; padding: 22px 16px 18px; text-align: left;
  background: #FFFFFF; color: var(--ink); font: inherit; cursor: pointer;
  border: 0; border-right: 1px solid var(--line-strong); border-bottom: 1px solid var(--ink);
}
.stages li:last-child .stage-tab { border-right: 0; }
.stage-tab::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 5px; background: transparent; }
.stage-tab:hover { background: var(--surface); }
.stage-tab::after { content: ""; position: absolute; top: 36px; left: 62px; right: 0; height: 1px; background: var(--line-strong); }
.stages li:last-child .stage-tab::after { display: none; }
.stage-tab[aria-selected="true"]::after { background: var(--red); }
.stage-no {
  display: inline-flex; align-items: center; justify-content: center; min-width: 38px; height: 28px; padding: 0 6px;
  border: 1px solid var(--ink); font-size: 14px; font-weight: 700; letter-spacing: 0.04em; background: #FFFFFF;
}
.stage-name { font-size: 17px; font-weight: 700; line-height: 1.25; }
.stage-sub { font-size: 14px; color: var(--muted); line-height: 1.35; }
.stage-tab[aria-selected="true"] { background: var(--tint); border-bottom-color: var(--tint); }
.stage-tab[aria-selected="true"]::before { background: var(--red); }
.stage-tab[aria-selected="true"] .stage-no { border-color: var(--red); box-shadow: inset 0 0 0 1px var(--red); }
.stage-tab[aria-selected="true"] .stage-name { color: var(--ink); }
.stage-tab:focus-visible { outline-offset: -4px; }

.stage-panels { border: 1px solid var(--ink); border-top: 0; background: #FFFFFF; }
.stage-panel { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.stage-panel + .stage-panel { border-top: 1px solid var(--ink); }
.js .stage-panel + .stage-panel { border-top: 0; }
.stage-panel[hidden] { display: none; }
.sp-body { padding: 36px 40px 32px; border-right: 1px solid var(--line-strong); }
.sp-count { margin: 0 0 8px; font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.sp-count b { color: var(--red-active); }
.sp-body h3 { font-size: 28px; margin-bottom: 10px; }
.sp-lead { font-size: 18px; color: var(--muted); max-width: 640px; margin-bottom: 28px; }
.sp-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; border: 1px solid var(--line-strong); }
.sp-col { padding: 20px 22px; }
.sp-col + .sp-col { border-left: 1px solid var(--line-strong); background: var(--surface); }
.sp-col h4 { margin-bottom: 12px; }
.ticks { list-style: none; display: grid; gap: 10px; font-size: 16px; line-height: 1.5; }
.ticks li { display: grid; grid-template-columns: 18px minmax(0, 1fr); gap: 10px; }
.ticks .ico { margin-top: 3px; color: var(--red-active); width: 17px; height: 17px; }
.dash { list-style: none; display: grid; gap: 10px; font-size: 16px; line-height: 1.5; }
.dash li { position: relative; padding-left: 20px; }
.dash li::before { content: ""; position: absolute; left: 0; top: 0.78em; width: 10px; height: 1px; background: var(--ink); }
.sp-foot { display: flex; flex-wrap: wrap; gap: 12px 20px; align-items: center; justify-content: space-between; margin-top: 24px; }
.sp-step { display: flex; gap: 8px; }
.sp-step .btn { min-height: 44px; padding: 8px 14px; font-size: 15px; }
.sp-fig { padding: 32px; display: flex; flex-direction: column; justify-content: flex-start; background-color: #FFFFFF; }
.sp-fig .fig { flex: none; }
.sp-fig .fig-media img { max-height: 360px; width: auto; }
.sp-fig .fig-media img[src$=".svg"] { width: 100%; max-width: 560px; max-height: none; }
.t-list { list-style: none; display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; border-top: 1px solid var(--line-strong); font-size: 15px; }
.t-list li { display: flex; gap: 10px; padding: 6px 0; border-bottom: 1px solid var(--line); }
.t-list b { min-width: 28px; }

/* record card (text figure) */
.record { width: 100%; border-collapse: collapse; font-size: 15px; }
.record th, .record td { text-align: left; padding: 12px 14px; border: 1px solid var(--line-strong); vertical-align: top; }
.record th { width: 40%; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; background: var(--surface); }

/* ---------- product families ---------- */
.families { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--ink); background: #FFFFFF; }
.fam { display: flex; flex-direction: column; border-right: 1px solid var(--line-strong); border-bottom: 1px solid var(--line-strong); }
.fam:nth-child(3n) { border-right: 0; }
.fam:nth-last-child(-n+3) { border-bottom: 0; }
.fam-media { height: 228px; display: flex; align-items: center; justify-content: center; padding: 20px; border-bottom: 1px solid var(--line); background: #FFFFFF; }
.fam-media img { max-height: 188px; width: auto; object-fit: contain; }
.fam-media.text-only { background: var(--surface); flex-direction: column; gap: 8px; text-align: center; color: var(--muted); font-size: 15px; }
.fam-media.text-only strong { font-size: 22px; color: var(--ink); }
.fam-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex: 1; }
.fam-code { font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.fam-body h3 { margin-bottom: 8px; }
.fam-body p { color: var(--muted); font-size: 16px; }
.fam-links { margin-top: auto; display: flex; flex-wrap: wrap; gap: 8px 20px; padding-top: 8px; }
.fam-links a { font-weight: 600; font-size: 15px; display: inline-flex; gap: 6px; align-items: center; }

/* ---------- evidence ---------- */
.evidence { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.ev { display: flex; flex-direction: column; background: #FFFFFF; border: 1px solid var(--line-strong); }
.ev-media { height: 190px; display: flex; align-items: center; justify-content: center; border-bottom: 1px solid var(--line); background: #FFFFFF; overflow: hidden; }
.ev-media img { width: 100%; height: 100%; object-fit: contain; }
.ev-media.text-only { flex-direction: column; align-items: stretch; justify-content: center; padding: 16px; background: #FFFFFF; }
.ev-body { padding: 20px 20px 22px; display: flex; flex-direction: column; flex: 1; }
.ev-body h3 { font-size: 19px; margin-bottom: 8px; }
.ev-body p { font-size: 15px; color: var(--muted); }
.ev-body a { margin-top: auto; font-weight: 600; font-size: 15px; display: inline-flex; gap: 6px; align-items: center; }
.mini-code { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--ink); font-size: 12px; text-align: center; }
.mini-code span { padding: 10px 4px; border-right: 1px solid var(--line-strong); line-height: 1.3; }
.mini-code span:last-child { border-right: 0; }
.mini-code b { display: block; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 700; margin-bottom: 4px; }
.std-list { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.std-list li { border: 1px solid var(--line-strong); padding: 3px 8px; font-size: 13px; font-weight: 600; background: #FFFFFF; }

/* ---------- start band ---------- */
.start { padding: 72px 0 88px; border-top: 1px solid var(--line); }
.start-box { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); border: 1px solid var(--ink); background: #FFFFFF; }
.start-copy { padding: 40px 44px; border-right: 1px solid var(--line-strong); }
.start-copy h2 { margin-bottom: 12px; }
.start-copy p { color: var(--muted); max-width: 560px; }
.start-side { padding: 40px 36px; background: var(--surface); display: grid; gap: 14px; align-content: center; }
.start-side a.plain { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 600; text-decoration: none; }
.start-side a.plain:hover { text-decoration: underline; }
.start-side .small { font-size: 14px; color: var(--muted); margin: 0; }

/* ---------- inner page head ---------- */
.page-head { padding: 48px 0 56px; border-bottom: 1px solid var(--line); }
.ph-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 40px; align-items: end; }
.page-head h1 { font-size: 44px; margin-bottom: 16px; }
.page-head .lead { font-size: 19px; color: var(--muted); max-width: 660px; margin: 0; }
.crumbs { font-size: 14px; color: var(--muted); margin-bottom: 20px; }
.crumbs a { color: var(--muted); }
.jump { border: 1px solid var(--ink); background: #FFFFFF; }
.jump p { margin: 0; padding: 10px 16px; border-bottom: 2px solid var(--ink); font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.jump ol { list-style: none; margin: 0; padding: 0; }
.jump li + li { border-top: 1px solid var(--line-strong); }
.jump a { display: flex; gap: 14px; align-items: center; padding: 10px 16px; text-decoration: none; font-weight: 600; font-size: 16px; }
.jump a span { min-width: 30px; font-size: 13px; color: var(--muted); font-weight: 700; }
.jump a:hover { background: var(--surface); }
.jump a em { font-style: normal; }
.jthumb { width: 64px; height: 40px; object-fit: contain; flex: none; background: #FFFFFF; border: 1px solid var(--line); }
.jthumb-none { display: block; background: var(--surface); }

/* product section (batteries / chargers) */
.prod { padding: 72px 0; border-bottom: 1px solid var(--line); }
.prod:nth-of-type(even) { background: var(--surface); }
.prod-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: start; }
.prod-copy h2 { font-size: 32px; margin-bottom: 14px; }
.prod-copy p { color: var(--muted); }
.prod-copy .ticks { margin: 20px 0 28px; }
.prod-figs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.prod-figs .fig.wide { grid-column: 1 / -1; }
.prod-figs .fig-media { min-height: 220px; }
.prod-figs .fig-media img { max-height: 300px; width: auto; }
.prod-figs .fig.wide .fig-media img { max-height: 380px; }
.text-panel { border: 1px solid var(--line-strong); background: #FFFFFF; padding: 28px; }
.text-panel h3 { font-size: 18px; margin-bottom: 8px; }
.text-panel p { color: var(--muted); font-size: 16px; margin-bottom: 12px; }
.text-panel p:last-child { margin-bottom: 0; }

/* circuit section */
.circuit { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 0; border: 1px solid var(--ink); background: #FFFFFF; }
.circuit .fig { border: 0; border-right: 1px solid var(--line-strong); }
.circuit .fig-media img { width: 100%; max-width: 760px; }
.legend { padding: 32px; }
.legend h3 { margin-bottom: 12px; }
.legend ol { list-style: none; padding: 0; margin: 16px 0 0; border-top: 2px solid var(--ink); }
.legend li { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line-strong); font-size: 16px; }
.legend li b { font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; }

/* stage list (custom-oem static) */
.stage-list { list-style: none; border: 1px solid var(--ink); background: #FFFFFF; }
.stage-row { display: grid; grid-template-columns: 96px minmax(0, 4fr) minmax(0, 4fr) minmax(0, 4fr); border-bottom: 1px solid var(--line-strong); }
.stage-row:last-child { border-bottom: 0; }
.stage-row > * { padding: 24px; }
.stage-row > * + * { border-left: 1px solid var(--line); }
.stage-row .sr-no { font-size: 28px; font-weight: 700; display: flex; flex-direction: column; gap: 6px; }
.stage-row .sr-no::before { content: ""; width: 28px; height: 5px; background: var(--red); }
.stage-row h3 { font-size: 20px; margin-bottom: 8px; }
.stage-row p { color: var(--muted); font-size: 16px; margin: 0; }
.stage-row h4 { margin-bottom: 10px; font-size: 13px; }
.stage-row .ticks, .stage-row .dash { font-size: 15px; }
.stage-row.head > * { padding: 12px 24px; font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); background: var(--surface); }

/* ---------- forms (spec brief + RFQ) ---------- */
.builder { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; align-items: start; }
.form-sheet { border: 1px solid var(--ink); background: #FFFFFF; }
.fs-group { padding: 24px 28px 8px; border-bottom: 1px solid var(--line-strong); }
.fs-group:last-child { border-bottom: 0; }
.fs-group legend, .fs-title { float: left; width: 100%; padding: 0; margin: 0 0 16px; font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); display: flex; align-items: center; gap: 10px; }
.fs-group legend span.n { color: var(--ink); border: 1px solid var(--ink); padding: 0 6px; letter-spacing: 0.04em; }
fieldset { border: 0; margin: 0; min-width: 0; }
fieldset.fs-group { padding: 24px 28px 8px; }
fieldset.fs-group > .row, fieldset.fs-group > .field { clear: both; }
.row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 20px; align-items: start; }
.field { margin-bottom: 18px; }
.field > label, .field > .flabel { display: block; font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.field .hint { display: block; font-size: 14px; color: var(--muted); font-weight: 400; margin-top: 2px; }
input[type="text"], input[type="email"], input[type="tel"], select, textarea {
  width: 100%; min-height: 46px; padding: 10px 12px; font: inherit; font-size: 16px; color: var(--ink);
  background: #FFFFFF; border: 1px solid var(--field); border-radius: 2px;
}
textarea { min-height: 112px; resize: vertical; line-height: 1.5; }
select { appearance: none; -webkit-appearance: none; padding-right: 40px;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink) 50%), linear-gradient(135deg, var(--ink) 50%, transparent 50%);
  background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px; background-repeat: no-repeat; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--red); outline-offset: 0; border-color: var(--ink); }
.choices { display: flex; flex-wrap: wrap; gap: 8px; }
.choice { position: relative; }
.choice input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.choice span { display: inline-flex; align-items: center; gap: 8px; min-height: 42px; padding: 8px 14px; border: 1px solid var(--field); border-radius: 2px; background: #FFFFFF; font-size: 15px; font-weight: 500; cursor: pointer; }
.choice span::before { content: ""; width: 12px; height: 12px; border: 1px solid var(--field); border-radius: 50%; flex: none; }
.choice input[type="checkbox"] + span::before { border-radius: 1px; }
.choice input:checked + span { background: var(--tint); border-color: var(--red); box-shadow: inset 0 0 0 1px var(--red); }
.choice input:checked + span::before { background: var(--red); border-color: var(--red); box-shadow: inset 0 0 0 2px #FFFFFF; }
.choice input:focus-visible + span { outline: 3px solid var(--red); outline-offset: 2px; }
.cond[hidden] { display: none; }
.form-end { display: flex; flex-wrap: wrap; gap: 12px; }
.review-link { display: none; }

.summary { position: sticky; top: 140px; border: 1px solid var(--ink); background: #FFFFFF; }
.sum-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 14px 20px; border-bottom: 2px solid var(--ink); }
.sum-head strong { font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; }
.sum-head span { font-size: 13px; color: var(--muted); }
.sum-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.sum-table th, .sum-table td { text-align: left; vertical-align: top; padding: 9px 20px; border-bottom: 1px solid var(--line); line-height: 1.45; }
.sum-table th { width: 42%; font-weight: 600; color: var(--muted); font-size: 14px; padding-right: 8px; }
.sum-table td { word-break: break-word; }
.sum-table td.unknown { color: var(--muted); font-style: italic; }
.sum-actions { padding: 20px; display: grid; gap: 10px; background: var(--surface); border-top: 1px solid var(--line-strong); }
.sum-actions .btn { justify-content: center; }
.honest { font-size: 14px; color: var(--muted); margin: 0; }
.status { min-height: 1.5em; font-size: 15px; margin: 0; font-weight: 600; }
.sum-count { padding: 12px 20px 8px; font-size: 14px; color: var(--muted); margin: 0; }

.rfq { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; align-items: start; }
.rfq-actions { padding: 24px 28px 28px; background: var(--surface); border-top: 1px solid var(--line-strong); display: grid; gap: 12px; }
.rfq-actions .btns { display: flex; flex-wrap: wrap; gap: 12px; }
.contact-card { border: 1px solid var(--ink); background: #FFFFFF; }
.contact-card .cc-row { padding: 20px 24px; border-bottom: 1px solid var(--line-strong); }
.contact-card .cc-row:last-child { border-bottom: 0; }
.contact-card h2 { font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.contact-card a.big { display: inline-flex; gap: 10px; align-items: center; font-size: 19px; font-weight: 600; text-decoration: none; word-break: break-all; }
.contact-card a.big:hover { text-decoration: underline; }
.contact-card p { margin: 0; color: var(--muted); font-size: 16px; }
.contact-card address { font-style: normal; font-size: 16px; line-height: 1.55; }
.field-error { color: var(--red-active); font-size: 14px; font-weight: 600; margin-top: 6px; }
.field-error[hidden] { display: none; }

/* ---------- quality page ---------- */
.lab-matrix { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 32px; align-items: start; }
.t-table { width: 100%; border-collapse: collapse; border: 1px solid var(--ink); background: #FFFFFF; font-size: 16px; margin-bottom: 16px; }
.t-table th, .t-table td { text-align: left; padding: 11px 16px; border-bottom: 1px solid var(--line-strong); }
.t-table thead th { font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); border-bottom: 2px solid var(--ink); background: var(--surface); }
.t-table tbody th { width: 72px; font-weight: 700; }
.tests { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.tests .fig-media { padding: 10px; height: 300px; }
.tests .fig-media img { max-height: 280px; width: auto; }
.tests figcaption { padding: 10px 12px; gap: 8px; color: var(--ink); font-weight: 600; font-size: 14px; }
.lab-rooms { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 24px; }
.qc-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--ink); background: #FFFFFF; }
.qc-grid > div { padding: 28px; border-right: 1px solid var(--line-strong); }
.qc-grid > div:last-child { border-right: 0; }
.qc-grid .sr-no { font-size: 13px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; display: flex; gap: 10px; align-items: center; }
.qc-grid .sr-no::before { content: ""; width: 20px; height: 4px; background: var(--red); }
.qc-grid h3 { font-size: 20px; margin-bottom: 8px; }
.qc-grid p { color: var(--muted); font-size: 16px; margin: 0; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; align-items: start; }
.docs-box { border: 1px solid var(--ink); background: #FFFFFF; padding: 32px; }
.docs-box h3 { margin-bottom: 10px; }
.docs-box p { color: var(--muted); }
.docs-box .std-list { margin: 16px 0 24px; }
.docs-box .std-list li { font-size: 15px; padding: 6px 12px; }

/* ---------- footer ---------- */
.site-footer { background: var(--surface); border-top: 1px solid var(--line-strong); padding: 56px 0 0; font-size: 15px; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 3fr) minmax(0, 2fr) minmax(0, 3fr); gap: 32px; padding-bottom: 40px; }
.foot-grid img { width: 204px; height: auto; margin: -10px 0 8px -6px; }
.foot-grid address { font-style: normal; color: var(--muted); line-height: 1.6; }
.foot-grid address strong { color: var(--ink); }
.foot-h { font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.foot-list { list-style: none; display: grid; gap: 8px; }
.foot-list a { text-decoration: none; }
.foot-list a:hover { text-decoration: underline; }
.foot-contact a { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; }
.foot-contact a:hover { text-decoration: underline; }
.foot-contact li { margin-bottom: 4px; }
.foot-base { border-top: 1px solid var(--line-strong); padding-top: 18px; padding-bottom: 24px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; color: var(--muted); font-size: 14px; }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .nav a { padding: 10px 8px; font-size: 15px; }
  .nav a[aria-current="page"]::after { left: 8px; right: 8px; }
  .bar { gap: 16px; }
  h1 { font-size: 42px; }
  .stage-tab { padding: 20px 12px 16px; }
  .stage-tab::after { left: 58px; top: 34px; }
  .stage-name { font-size: 16px; }
}
@media (max-width: 1060px) {
  .nav, .head-cta-wide { display: none; }
  .menu-btn { display: inline-flex; }
  .head-cta { margin-left: auto; }
  .menu-btn { margin-left: 0; }
  .util-tag { display: none; }
  .util-in { justify-content: flex-end; }
  .sheet { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-areas: "copy copy" "photo schem" "tb tb"; }
  .hero-copy { border-right: 0; border-bottom: 1px solid var(--ink); }
  .sheet > .fig-schem { border-top: 0; border-right: 0; border-left: 1px solid var(--line-strong); }
  .sheet > .fig .fig-media { padding: 20px; }
  .title-block { padding: 28px 32px 24px; }
  .lab-matrix { grid-template-columns: minmax(0, 1fr); }
  .stages { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .stages li:nth-child(3) .stage-tab { border-right: 0; }
  .stages li:nth-child(3) .stage-tab::after { display: none; }
  .stage-tab::after { left: 58px; top: 34px; }
  .stage-tab { min-height: 112px; }
  .stage-panel { grid-template-columns: minmax(0, 1fr); }
  .sp-body { border-right: 0; border-bottom: 1px solid var(--line-strong); }
  .sp-fig .fig-media img { max-height: 320px; }
  .families { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fam:nth-child(3n) { border-right: 1px solid var(--line-strong); }
  .fam:nth-child(2n) { border-right: 0; }
  .fam:nth-last-child(-n+3) { border-bottom: 1px solid var(--line-strong); }
  .fam:nth-last-child(-n+2) { border-bottom: 0; }
  .evidence { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sec-head, .ph-grid { grid-template-columns: minmax(0, 1fr); gap: 16px; align-items: start; }
  .start-box, .builder, .rfq, .circuit, .split { grid-template-columns: minmax(0, 1fr); }
  .start-copy { border-right: 0; border-bottom: 1px solid var(--line-strong); }
  .circuit .fig { border-right: 0; border-bottom: 1px solid var(--line-strong); }
  .summary { position: static; }
  .review-link { display: inline-flex; }
  .prod-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .stage-row { grid-template-columns: 72px minmax(0, 1fr) minmax(0, 1fr); }
  .stage-row > .sr-main { grid-column: 2 / -1; }
  .stage-row > .sr-we { grid-column: 2 / 3; border-left: 0; border-top: 1px solid var(--line); }
  .stage-row > .sr-you { grid-column: 3 / 4; border-top: 1px solid var(--line); }
  .stage-row > .sr-no { grid-row: 1 / span 2; }
  .stage-row.head { display: none; }
  .foot-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .qc-grid { grid-template-columns: minmax(0, 1fr); }
  .qc-grid > div { border-right: 0; border-bottom: 1px solid var(--line-strong); }
  .qc-grid > div:last-child { border-bottom: 0; }
}
@media (max-width: 760px) {
  :root { --pad: 20px; }
  body { font-size: 17px; }
  h1 { font-size: 34px; }
  h2 { font-size: 28px; }
  .page-head h1 { font-size: 34px; }
  .sec, .path { padding: 64px 0; }
  .hero { padding: 20px 0 48px; }
  .hero-copy { padding: 32px 24px 28px; }
  .sheet { grid-template-columns: minmax(0, 1fr); grid-template-areas: "copy" "photo" "schem" "tb"; }
  .sheet > .fig-schem { border-left: 0; border-top: 1px solid var(--line-strong); }
  .sheet > .fig .fig-media { padding: 16px; }
  .tests { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tests .fig-media { height: 280px; }
  .tests .fig-media img { max-height: 260px; }
  .title-block { padding: 24px; }
  .stages { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stages li:nth-child(3) .stage-tab { border-right: 1px solid var(--line-strong); }
  .stages li:nth-child(2n) .stage-tab { border-right: 0; }
  .stages li:nth-child(3) .stage-tab::after { display: block; }
  .stages li:nth-child(2n) .stage-tab::after { display: none; }
  .stage-tab::after { left: 58px; top: 30px; }
  .stage-tab { min-height: 96px; padding: 16px 12px 14px; }
  .stage-sub { display: none; }
  .sp-body { padding: 28px 20px 24px; }
  .sp-body h3 { font-size: 24px; }
  .sp-cols { grid-template-columns: minmax(0, 1fr); }
  .sp-col + .sp-col { border-left: 0; border-top: 1px solid var(--line-strong); }
  .sp-fig { padding: 20px; }
  .t-list { grid-template-columns: minmax(0, 1fr); }
  .families, .evidence, .lab-rooms { grid-template-columns: minmax(0, 1fr); }
  .prod-figs { gap: 10px; }
  .prod-figs .fig-media { min-height: 0; padding: 10px; }
  .prod-figs .fig figcaption { padding: 8px 10px; font-size: 13px; gap: 8px; }
  .prod-figs .text-panel { padding: 20px; }
  .fam { border-right: 0 !important; border-bottom: 1px solid var(--line-strong) !important; }
  .fam:last-child { border-bottom: 0 !important; }
  .start-copy, .start-side { padding: 28px 24px; }
  .row { grid-template-columns: minmax(0, 1fr); }
  .fs-group, fieldset.fs-group { padding: 20px 20px 4px; }
  .rfq-actions { padding: 20px; }
  .stage-row { grid-template-columns: minmax(0, 1fr); }
  .stage-row > * { grid-column: 1 / -1 !important; grid-row: auto !important; border-left: 0 !important; padding: 18px 20px; }
  .stage-row > * + * { border-top: 1px solid var(--line); }
  .stage-row .sr-no { flex-direction: row; align-items: center; gap: 12px; font-size: 22px; padding-bottom: 0; }
  .stage-row > .sr-main { border-top: 0; padding-top: 6px; }
  .legend { padding: 24px 20px; }
  .docs-box { padding: 24px 20px; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
}
@media (max-width: 560px) {
  .head-cta { display: none; }
  .menu-btn { margin-left: auto; }
  .util { display: none; }
  .brand img { width: 173px; }
  .bar { min-height: 64px; }
  html { scroll-padding-top: 76px; }
  :root { --pad: 16px; }
  h1 { font-size: 27px; line-height: 1.15; letter-spacing: -0.015em; }
  .hero-copy .lead { display: none; }
  .hero-copy { padding: 24px 16px 20px; }
  .hero-copy h1 { margin-bottom: 18px; }
  .cta-row .btn { flex: 1 1 auto; justify-content: center; }
  .hero-note { display: none; }
  .tb-row { grid-template-columns: 96px minmax(0, 1fr); gap: 12px; }
  .fam-media { height: 200px; }
  .fam-media img { max-height: 164px; }
  .page-head { padding: 32px 0 40px; }
  .page-head h1 { font-size: 30px; }
  .mini-code { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mini-code span:nth-child(2) { border-right: 0; }
  .mini-code span:nth-child(-n+2) { border-bottom: 1px solid var(--line-strong); }
  .sum-table th, .sum-table td { padding: 9px 14px; }
}

@media (max-width: 380px) {
  h1 { font-size: 24px; }
  .hero-copy { padding-left: 14px; padding-right: 14px; }
}

@media print {
  .site-header, .site-footer, .sum-actions { display: none; }
}

/* utilities */
.mt { margin-top: 24px; }
.mt-l { margin-top: 32px; }
.lead-muted { font-size: 18px; color: var(--muted); max-width: 520px; margin-top: 16px; }
.text-panel.wide { grid-column: 1 / -1; }

/* =====================================================================
   v2 — craft layer: type scale, cut-out objects, motion system
   ===================================================================== */
:root { --ease: cubic-bezier(.2, .7, .2, 1); --hdr: 76px; }
body { line-height: 1.65; }
h2 { font-size: 40px; line-height: 1.08; letter-spacing: -0.022em; }
.hero-h1 { font-size: 60px; line-height: 1.03; letter-spacing: -0.032em; font-weight: 700; }
.page-head .hero-h1 { font-size: 52px; }
.label .num { letter-spacing: 0.14em; }
.lead { line-height: 1.6; }

/* view transitions between pages */
@view-transition { navigation: auto; }
.site-header { view-transition-name: site-header; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: 260ms; animation-timing-function: cubic-bezier(.2, .7, .2, 1); }

/* header condenses on scroll (transform only) */
.site-header { transition: transform 360ms var(--ease), box-shadow 360ms var(--ease); will-change: transform; }
.site-header.is-condensed { transform: translateY(-37px); box-shadow: 0 1px 0 var(--line), 0 12px 32px -18px rgba(17, 17, 17, 0.18); }
.brand img { transition: transform 360ms var(--ease); transform-origin: left center; }
.site-header.is-condensed .brand img { transform: scale(0.9); }

/* buttons: micro-interactions */
.btn { transition: background-color 200ms ease, border-color 200ms ease, color 200ms ease, transform 240ms var(--ease), box-shadow 240ms var(--ease); }
.btn .ico { transition: transform 260ms var(--ease); }
.btn:hover .ico:last-child { transform: translateX(3px); }
.btn-red:hover { transform: translateY(-1px); box-shadow: 0 8px 18px -10px rgba(230, 0, 18, 0.55); }
.btn-line:hover { transform: translateY(-1px); box-shadow: 0 8px 18px -12px rgba(17, 17, 17, 0.35); }
.fam-links a .ico, .ev-body a .ico { transition: transform 260ms var(--ease); }
.fam-links a:hover .ico, .ev-body a:hover .ico { transform: translateX(3px); }

/* entrance choreography */
.motion [data-reveal] { opacity: 0; transform: translate3d(0, 18px, 0); transition: opacity 620ms var(--ease), transform 620ms var(--ease); transition-delay: var(--d, 0ms); }
.motion [data-reveal].in { opacity: 1; transform: none; }

/* ---------- cut-out objects with contact shadow ---------- */
.obj { margin: 0; display: flex; flex-direction: column; background: linear-gradient(180deg, #FFFFFF 0%, #FFFFFF 56%, #F2F3F5 100%); border: 1px solid var(--line-strong); }
.obj-stage { flex: 1; display: flex; align-items: center; justify-content: center; padding: 30px 24px 38px; min-height: 230px; }
.obj-hold { position: relative; display: inline-block; max-width: 100%; line-height: 0; }
.obj-img { position: relative; z-index: 1; display: block; max-width: 100%; height: auto; filter: drop-shadow(0 6px 8px rgba(17, 17, 17, 0.07)); transition: transform 520ms var(--ease); }
.obj-shadow { position: absolute; z-index: 0; left: 6%; right: 6%; bottom: -8%; height: 16%; background: radial-gradient(closest-side, rgba(17, 17, 17, 0.22), rgba(17, 17, 17, 0.08) 55%, rgba(17, 17, 17, 0) 100%); transition: transform 520ms var(--ease), opacity 520ms var(--ease); }
.obj figcaption { display: flex; gap: 12px; align-items: baseline; padding: 12px 16px; border-top: 1px solid var(--line); font-size: 14px; line-height: 1.45; color: var(--muted); background: #FFFFFF; }
.obj:hover .obj-img, .fam:hover .obj-img, .lu:hover .obj-img { transform: translateY(-6px); }
.obj:hover .obj-shadow, .fam:hover .obj-shadow, .lu:hover .obj-shadow { transform: scaleX(0.88); opacity: 0.7; }
.prod-figs .obj-img { max-height: 250px; width: auto; }
.prod-figs .obj.wide .obj-img { max-height: 320px; }
.prod-figs .obj.wide { grid-column: 1 / -1; }
.sp-fig .obj-img { max-height: 300px; width: auto; }

/* ---------- hero v2 ---------- */
.hero { padding: 36px 0 80px; }
.hero-sheet { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); grid-template-areas: "copy obj" "strip strip"; }
.hero-sheet .hero-copy { padding: 56px 56px 48px; }
.hero-copy .hero-h1 { margin-bottom: 24px; max-width: 760px; }
.hero-obj { grid-area: obj; margin: 0; display: flex; flex-direction: column; position: relative; }
.hero-stage { position: relative; flex: 1; display: flex; align-items: center; justify-content: center; padding: 72px 44px 76px; background: radial-gradient(ellipse 70% 60% at 50% 58%, #FFFFFF 0%, #FFFFFF 45%, #F2F3F5 100%); overflow: hidden; }
.hero-hold .obj-img { width: auto; max-width: 100%; max-height: 330px; }
.hero-obj figcaption { position: absolute; top: 26px; right: 24px; z-index: 2; display: flex; gap: 10px; align-items: baseline; font-size: 14px; color: var(--muted); background: #FFFFFF; padding: 4px 8px; border: 1px solid var(--line); }
.leader { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.leader path { fill: none; stroke: var(--ink); stroke-width: 1; vector-effect: non-scaling-stroke; }
.dim { position: absolute; pointer-events: none; }
.dim-x { left: 18%; right: 18%; bottom: 28px; height: 11px; border-left: 1px solid var(--ink); border-right: 1px solid var(--ink); }
.dim-x::before { content: ""; position: absolute; left: 0; right: 0; top: 5px; height: 1px; background: var(--ink); }
.dim-y { top: 22%; bottom: 22%; left: 26px; width: 11px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.dim-y::before { content: ""; position: absolute; top: 0; bottom: 0; left: 5px; width: 1px; background: var(--ink); }
.spec-strip { grid-area: strip; margin: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.spec-strip > div { padding: 18px 20px 20px; border-right: 1px solid var(--line-strong); }
.spec-strip > div:last-child { border-right: 0; }
.spec-strip dt { font-size: 12px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.spec-strip dd { margin: 0; font-size: 15px; line-height: 1.45; }
.hero-sheet .hero-copy { border-right: 1px solid var(--line-strong); }
/* hero entrance */
.motion .hero-h1 { animation: h1-in 900ms var(--ease) both; }
.motion .hero-label .rule { animation: rule-in 700ms var(--ease) 120ms both; transform-origin: left; }
.motion .hero-copy .lead, .motion .hero-copy .cta-row, .motion .hero-note { animation: up-in 700ms var(--ease) both; }
.motion .hero-copy .lead { animation-delay: 220ms; }
.motion .hero-copy .cta-row { animation-delay: 320ms; }
.motion .hero-note { animation-delay: 420ms; }
.motion .hero-hold .obj-img { animation: settle 1000ms var(--ease) 200ms both; }
.motion .hero-hold .obj-shadow { animation: shadow-in 1000ms var(--ease) 200ms both; }
.motion .leader path { stroke-dasharray: 120; stroke-dashoffset: 120; animation: draw-in 700ms var(--ease) 900ms forwards; }
.motion .hero-obj figcaption { animation: up-in 500ms var(--ease) 1200ms both; }
.motion .spec-strip > div { animation: up-in 600ms var(--ease) both; }
.motion .spec-strip > div:nth-child(1) { animation-delay: 500ms; }
.motion .spec-strip > div:nth-child(2) { animation-delay: 560ms; }
.motion .spec-strip > div:nth-child(3) { animation-delay: 620ms; }
.motion .spec-strip > div:nth-child(4) { animation-delay: 680ms; }
.motion .spec-strip > div:nth-child(5) { animation-delay: 740ms; }
@keyframes h1-in { from { opacity: 0; transform: translateY(22px); clip-path: inset(0 0 100% 0); } to { opacity: 1; transform: none; clip-path: inset(0 0 -10% 0); } }
@keyframes rule-in { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes up-in { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes settle { from { opacity: 0; transform: translateY(-26px); } to { opacity: 1; transform: none; } }
@keyframes shadow-in { from { opacity: 0; transform: scaleX(0.55); } to { opacity: 1; transform: none; } }
@keyframes draw-in { to { stroke-dashoffset: 0; } }

/* ---------- signature: how protection is engineered ---------- */
.protect { border-top: 1px solid var(--line); background: #FFFFFF; }
.protect-sticky { padding: 80px 0; }
.protect-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 56px; align-items: center; }
.protect-sheet { border: 1px solid var(--ink); background: #FFFFFF; }
.ps-head { display: flex; justify-content: space-between; gap: 16px; padding: 10px 16px; border-bottom: 2px solid var(--ink); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.ps-head b { color: var(--ink); margin-right: 10px; }
.ps-draw { padding: 10px 18px; background-color: #FFFFFF; background-image: linear-gradient(to right, var(--grid) 1px, transparent 1px), linear-gradient(to bottom, var(--grid) 1px, transparent 1px); background-size: 24px 24px; }
.ps-draw .pcb { display: block; width: 100%; height: auto; }
.ps-draw .pcb-bg { fill: transparent; }
.ps-foot { display: flex; align-items: center; gap: 16px; padding: 10px 16px; border-top: 1px solid var(--line-strong); font-size: 13px; color: var(--muted); }
.ps-ruler { position: relative; flex: 0 0 34%; height: 10px; background-image: repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px 8px); }
.ps-fill { position: absolute; left: 0; right: 0; bottom: 0; height: 3px; background: var(--red); transform-origin: left; transform: scaleX(1); }
.protect-copy h2 { margin-bottom: 14px; }
.protect-lead { color: var(--muted); font-size: 17px; max-width: 520px; margin-bottom: 22px; }
.callouts { list-style: none; display: grid; gap: 4px; }
.callout { position: relative; padding: 12px 0 12px 20px; border-left: 2px solid var(--line-strong); transition: opacity 360ms var(--ease), border-color 360ms var(--ease); }
.callout h3 { font-size: 18px; margin: 2px 0 4px; }
.callout p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.55; }
.callout .co-lv { display: flex; gap: 10px; align-items: center; font-size: 12px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--red-active); }
.lv-no { display: inline-flex; align-items: center; justify-content: center; min-width: 22px; height: 22px; padding: 0 4px; border: 1.5px solid var(--red); border-radius: 50%; font-size: 12px; letter-spacing: 0; color: var(--red-active); background: #FFFFFF; }
.lv-no.lv-out { border-radius: 2px; border-color: var(--ink); color: var(--ink); }
.co-cta { margin-top: 14px !important; }
.protect-steps { display: none; }
.motion-only { display: none; }
.motion .motion-only { display: inline; }
.motion p.motion-only { display: block; }
.protect-skip { margin: 18px 0 0; font-size: 14px; }
.protect-skip a { color: var(--muted); }
/* schematic states — default = final annotated state */
.pcb .zone { fill: rgba(230, 0, 18, 0); stroke: #E60012; stroke-width: 2; stroke-dasharray: 7 5; transition: fill 400ms var(--ease), stroke 400ms var(--ease), stroke-width 300ms var(--ease); }
.pcb .zlabel { fill: #E60012; transition: fill 400ms var(--ease); }
.pcb .tag circle { fill: #FFFFFF; stroke: #E60012; stroke-width: 2; transition: stroke 400ms var(--ease); }
.pcb .tag text { fill: #B8000E; transition: fill 400ms var(--ease); }
.pcb .trace { opacity: 0.9; }
.pcb .pulse { fill: #E60012; stroke: #FFFFFF; stroke-width: 3; opacity: 0; }
.pcb .tx text { font-family: var(--font); }
.pcb text { font-family: var(--font); }
.pcb.is-live .zone { stroke: #C9CDD3; }
.pcb.is-live .zlabel { fill: #8A9099; }
.pcb.is-live .tag circle { stroke: #C9CDD3; }
.pcb.is-live .tag text { fill: #8A9099; }
.pcb.is-live .zone.on { stroke: #E60012; }
.pcb.is-live .zlabel.on { fill: #E60012; }
.pcb.is-live .tag.on circle { stroke: #E60012; }
.pcb.is-live .tag.on text { fill: #B8000E; }
.pcb .zone.act, .pcb[data-hl="1"] .zone[data-z="1"], .pcb[data-hl="2"] .zone[data-z="2"], .pcb[data-hl="3"] .zone[data-z="3"] { fill: rgba(230, 0, 18, 0.06); stroke-width: 3; stroke-dasharray: none; }
.motion .protect.is-live .callout { opacity: 0.36; }
.motion .protect.is-live .callout.act { opacity: 1; border-left-color: var(--red); }
.motion .protect.is-live .callout.done { opacity: 0.62; }

/* ---------- circuit block with interactive legend ---------- */
.circuit-fig { margin: 0; border-right: 1px solid var(--line-strong); display: flex; flex-direction: column; }
.circuit-fig .pcb { display: block; width: 100%; height: auto; padding: 20px 20px 8px; }
.circuit-fig figcaption { display: flex; gap: 12px; align-items: baseline; padding: 12px 16px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); margin-top: auto; }
.levels { list-style: none; margin: 14px 0 0; padding: 0; border-top: 2px solid var(--ink); }
.levels li { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 12px; padding: 12px 10px 12px 12px; border-bottom: 1px solid var(--line-strong); font-size: 15px; line-height: 1.5; cursor: default; box-shadow: inset 0 0 0 0 var(--red); transition: background-color 240ms ease, box-shadow 240ms var(--ease); }
.levels li b { display: flex; gap: 8px; align-items: center; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--red-active); }
.levels li:hover, .levels li:focus-visible, .levels li.act { background: var(--tint); box-shadow: inset 3px 0 0 0 var(--red); outline: none; }
.after-note { margin-top: 20px; color: var(--muted); }

/* ---------- project path: drafting line, framed figures, panel motion ---------- */
.stages-wrap { position: relative; }
.draft { display: none; }
.stage-panels { position: relative; overflow: hidden; }
.sp-fig { position: relative; }
.frame-ticks { position: absolute; inset: 14px; pointer-events: none;
  background:
    linear-gradient(var(--ink), var(--ink)) left top / 14px 1px no-repeat, linear-gradient(var(--ink), var(--ink)) left top / 1px 14px no-repeat,
    linear-gradient(var(--ink), var(--ink)) right top / 14px 1px no-repeat, linear-gradient(var(--ink), var(--ink)) right top / 1px 14px no-repeat,
    linear-gradient(var(--ink), var(--ink)) left bottom / 14px 1px no-repeat, linear-gradient(var(--ink), var(--ink)) left bottom / 1px 14px no-repeat,
    linear-gradient(var(--ink), var(--ink)) right bottom / 14px 1px no-repeat, linear-gradient(var(--ink), var(--ink)) right bottom / 1px 14px no-repeat; }
.sp-fig .sp-figure { position: relative; z-index: 1; }
.sp-fig .obj { flex: none; }
.motion .sp-figure.pre { opacity: 0; transform: translateX(44px); }
.sp-figure.slide { transition: opacity 560ms var(--ease), transform 560ms var(--ease); }
.stage-no { position: relative; z-index: 2; transition: border-color 300ms ease, box-shadow 300ms ease; }
.stage-no.reached { box-shadow: inset 0 0 0 1px var(--ink); }

/* ---------- families: filter + cards ---------- */
.fam-filter { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: -8px 0 22px; }
.chip { min-height: 42px; padding: 8px 16px; border: 1px solid var(--field); border-radius: 2px; background: #FFFFFF; color: var(--ink); font: inherit; font-size: 15px; font-weight: 600; cursor: pointer; transition: border-color 200ms ease, box-shadow 200ms ease, background-color 200ms ease; }
.chip span { margin-left: 6px; font-size: 13px; color: var(--muted); font-weight: 600; }
.chip:hover { border-color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--tint); border-color: var(--red); box-shadow: inset 0 0 0 1px var(--red); }
.fam-status { margin: 0 0 0 8px; font-size: 14px; color: var(--muted); }
.families { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; border: 0; background: transparent; }
.fam { border: 1px solid var(--line-strong) !important; background: #FFFFFF; transition: border-color 260ms ease, box-shadow 360ms var(--ease); }
.fam[hidden] { display: none; }
.fam:hover, .fam:focus-within { border-color: var(--ink) !important; box-shadow: 0 18px 34px -24px rgba(17, 17, 17, 0.32); }
.fam-media { height: 210px; background: linear-gradient(180deg, #FFFFFF 0%, #FFFFFF 50%, #F2F3F5 100%); padding: 26px 22px 34px; }
.fam-media .obj-img { max-height: 150px; width: auto; }
.fam-media.fam-photo { padding: 0; background: #F2F3F5; overflow: hidden; }
.fam-media.fam-photo img { width: 100%; height: 100%; object-fit: cover; max-height: none; transition: transform 700ms var(--ease); }
.fam:hover .fam-photo img { transform: scale(1.04); }
.fam-body { padding: 20px 20px 22px; }
.fam-body h3 { font-size: 19px; }
.fam-body p { font-size: 15px; }
.fam-code { font-size: 11px; }

/* ---------- inner page heads: product lineups ---------- */
.page-head { padding: 44px 0 0; }
.ph-grid { align-items: end; padding-bottom: 48px; }
.lineup { position: relative; display: flex; align-items: flex-end; justify-content: center; gap: 22px; padding: 20px 8px 40px; min-height: 260px; }
.lu { margin: 0; flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; align-items: center; gap: 18px; }
.lu .obj-img { max-height: 170px; width: auto; }
.lu figcaption { font-size: 12px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); position: relative; padding-top: 10px; }
.lu figcaption::before { content: ""; position: absolute; left: 50%; top: 0; width: 1px; height: 7px; background: var(--ink); }
.lu-base { position: absolute; left: 0; right: 0; bottom: 26px; height: 1px; background: var(--ink); }
.lu-base::before { content: ""; position: absolute; left: 0; right: 0; top: 1px; height: 6px; background-image: repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px 8px); }
.motion .lineup .lu { transition-duration: 760ms; }

/* sticky family index bar */
.index-bar { position: sticky; top: var(--hdr); z-index: 40; background: #FFFFFF; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line-strong); }
.index-bar ol { list-style: none; display: flex; gap: 0; position: relative; }
.index-bar li { flex: 1 1 0; min-width: 0; }
.index-bar a { position: relative; display: flex; align-items: center; gap: 10px; min-height: 60px; padding: 8px 14px; text-decoration: none; font-size: 15px; font-weight: 600; border-right: 1px solid var(--line); transition: background-color 200ms ease; }
.index-bar li:first-child a { border-left: 1px solid var(--line); }
.index-bar a:hover { background: var(--surface); }
.index-bar a em { font-style: normal; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ib-no { font-size: 12px; font-weight: 700; color: var(--muted); min-width: 14px; }
.ib-img { width: 46px; height: 32px; object-fit: contain; flex: none; }
.index-bar a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 3px; background: var(--red); transform: scaleX(0); transform-origin: left; transition: transform 420ms var(--ease); }
.index-bar a.is-current::after { transform: scaleX(1); }
.index-bar a.is-current { color: var(--ink); }
.prod { scroll-margin-top: 150px; }

/* ---------- Custom & OEM: vertical drafting line ---------- */
.stage-list-wrap { position: relative; }
.vdraft { display: none; }
.sr-num { position: relative; z-index: 2; background: #FFFFFF; }

/* ---------- forms + assembling summary ---------- */
input[type="text"], input[type="email"], input[type="tel"], select, textarea { transition: border-color 200ms ease, box-shadow 260ms var(--ease); }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(230, 0, 18, 0.22), inset 0 -2px 0 var(--red); }
.choice span { transition: background-color 200ms ease, border-color 200ms ease, box-shadow 200ms ease; }
.field-error:not([hidden]) { animation: up-in 320ms var(--ease) both; }
.sum-meter { position: relative; height: 12px; margin: 12px 20px 0; background-image: repeating-linear-gradient(to right, var(--line-strong) 0 1px, transparent 1px 10px); background-size: 100% 7px; background-repeat: no-repeat; }
.sum-fill { position: absolute; left: 0; right: 0; bottom: 0; height: 3px; background: var(--red); transform-origin: left; transform: scaleX(var(--f, 0)); transition: transform 520ms var(--ease); }
.sum-table th, .sum-table td { position: relative; isolation: isolate; transition: color 300ms ease; }
.sum-table th::before { content: ""; position: absolute; left: 0; top: 6px; bottom: 6px; width: 2px; background: var(--ink); transform: scaleY(0); transform-origin: top; transition: transform 420ms var(--ease), background-color 300ms ease; }
.sum-table tr.filled th::before { transform: scaleY(1); }
.sum-table tr.filled th { color: var(--ink); }
.sum-table tr.flash th::before { background: var(--red); }
.sum-table tr.flash th::after, .sum-table tr.flash td::after { content: ""; position: absolute; inset: 0; z-index: -1; background: #FFE8EA; animation: row-flash 900ms var(--ease) forwards; }
@keyframes row-flash { from { opacity: 1; } to { opacity: 0; } }
.sum-table td.unknown { color: var(--muted); }
.rfq-side { display: grid; gap: 20px; position: sticky; top: calc(var(--hdr) + 20px); }
.rfq-summary { position: static; }
.mobile-menu.is-open .mm-in { animation: menu-in 320ms var(--ease) both; }
@keyframes menu-in { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: none; } }

/* ---------- quality: table ↔ photo, record assembly ---------- */
.t-table tbody tr { cursor: default; transition: background-color 200ms ease, box-shadow 200ms ease; }
.t-table tbody tr:hover, .t-table tbody tr:focus-visible, .t-table tbody tr.hl { background: var(--tint); box-shadow: inset 3px 0 0 var(--red); outline: none; }
.tests .fig { transition: opacity 300ms var(--ease), border-color 300ms ease, box-shadow 300ms ease, transform 300ms var(--ease); }
.tests.has-hl .fig:not(.hl) { opacity: 0.4; }
.tests .fig.hl { border-color: var(--red); box-shadow: 0 0 0 1px var(--red); }
.motion [data-assemble] .record tr { opacity: 0; transform: translateX(-14px); transition: opacity 520ms var(--ease), transform 520ms var(--ease); }
.motion [data-assemble].in .record tr { opacity: 1; transform: none; }
.motion [data-assemble].in .record tr:nth-child(2) { transition-delay: 140ms; }
.motion [data-assemble].in .record tr:nth-child(3) { transition-delay: 280ms; }
.motion [data-assemble].in .record tr:nth-child(4) { transition-delay: 420ms; }

/* ---------- evidence / proof cards micro ---------- */
.ev { transition: border-color 260ms ease, box-shadow 360ms var(--ease); }
.ev:hover { border-color: var(--ink); box-shadow: 0 18px 34px -24px rgba(17, 17, 17, 0.32); }
.ev-media img { transition: transform 700ms var(--ease); }
.ev:hover .ev-media img { transform: scale(1.03); }

/* ---------- desktop-only motion: sticky protection stage + drafting lines ---------- */
@media (min-width: 1061px) {
  .motion .protect-track { height: 240vh; }
  .motion .protect-sticky { position: sticky; top: var(--hdr); height: calc(100vh - var(--hdr)); display: flex; align-items: center; padding: 20px 0; }
  .motion .protect-sticky > .wrap { width: 100%; }
  .motion .ps-draw .pcb { max-height: calc(100vh - var(--hdr) - 150px); }
  .motion .stages-wrap.has-draft .draft { display: block; position: absolute; z-index: 1; left: 36px; top: 36px; width: calc((100% - 2px) * 5 / 6); height: 2px; pointer-events: none; }
  .draft-line { display: block; width: 100%; height: 2px; background: var(--ink); transform-origin: left; transform: scaleX(var(--p, 0)); }
  .motion .stages-wrap.has-draft .stage-tab::after { display: none; }
  .motion .stage-list-wrap.has-draft .vdraft { display: block; position: absolute; z-index: 1; left: 48px; top: 40px; bottom: 40px; width: 2px; pointer-events: none; }
  .vdraft-line { display: block; width: 2px; height: 100%; background: var(--ink); transform-origin: top; transform: scaleY(var(--p, 0)); }
  .stage-row .sr-no::before { position: relative; z-index: 2; }
}

/* ---------- responsive (v2) ---------- */
@media (max-width: 1180px) {
  .hero-h1 { font-size: 52px; }
  .families { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .spec-strip > div { padding: 16px 14px 18px; }
}
@media (max-width: 1060px) {
  .hero-sheet { grid-template-columns: minmax(0, 1fr); grid-template-areas: "copy" "obj" "strip"; }
  .hero-sheet .hero-copy { border-right: 0; border-bottom: 1px solid var(--line-strong); padding: 44px 40px 36px; }
  .hero-stage { padding: 64px 36px 64px; min-height: 360px; }
  .spec-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spec-strip > div { border-bottom: 1px solid var(--line-strong); }
  .spec-strip > div:nth-child(2n) { border-right: 0; }
  .spec-strip > div:last-child { grid-column: 1 / -1; border-bottom: 0; }
  .protect-grid { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .protect-copy { display: contents; }
  .protect-copy > .label { order: 1; }
  .protect-copy > h2 { order: 2; }
  .protect-copy > .protect-lead { order: 3; }
  .protect-sheet { order: 4; margin-bottom: 18px; }
  .protect-copy > .callouts { order: 5; }
  .protect-copy > .protect-steps { order: 6; }
  .protect-copy > .protect-skip { order: 7; }
  .motion .protect-steps { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 14px; }
  .ps-count { font-size: 14px; color: var(--muted); }
  .ps-count b { color: var(--ink); }
  .motion .callouts { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 12px; padding-bottom: 4px; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
  .motion .callouts::-webkit-scrollbar { display: none; }
  .motion .callout { flex: 0 0 86%; scroll-snap-align: center; border: 1px solid var(--line-strong); border-top: 3px solid var(--line-strong); padding: 16px 18px; background: #FFFFFF; }
  .motion .protect.is-live .callout.act { border-left-color: var(--line-strong); border-top-color: var(--red); }
  .motion .protect.is-live .callout { opacity: 0.5; }
  .protect-skip { display: none !important; }
  .families { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lineup { min-height: 220px; }
  .rfq-side { position: static; }
  .index-bar .ib-img { display: none; }
  .levels li { grid-template-columns: minmax(0, 1fr); gap: 4px; }
}
@media (max-width: 760px) {
  .hero-h1 { font-size: 36px; }
  .page-head .hero-h1 { font-size: 34px; }
  h2 { font-size: 30px; }
  .hero-sheet .hero-copy { padding: 30px 22px 26px; }
  .hero-stage { padding: 56px 24px 56px; min-height: 0; }
  .hero-hold .obj-img { max-height: 220px; }
  .hero-obj figcaption { top: 14px; right: 14px; }
  .dim-y { left: 12px; }
  .dim-x { bottom: 18px; }
  .spec-strip { grid-template-columns: minmax(0, 1fr); }
  .spec-strip > div { display: grid; grid-template-columns: 104px minmax(0, 1fr); gap: 12px; border-right: 0 !important; padding: 12px 18px; }
  .spec-strip > div:last-child { grid-column: auto; }
  .spec-strip dt { margin: 2px 0 0; }
  .protect-sticky { padding: 56px 0; }
  .ps-head { flex-direction: column; gap: 2px; font-size: 11px; }
  .ps-draw { padding: 6px 8px; }
  .ps-foot { flex-direction: column; align-items: stretch; gap: 8px; }
  .ps-ruler { flex: none; width: 100%; }
  .families { grid-template-columns: minmax(0, 1fr); }
  .fam-media { height: 190px; }
  .lineup { gap: 10px; min-height: 0; padding: 12px 0 40px; }
  .lu .obj-img { max-height: 92px; }
  .lu figcaption { font-size: 10px; letter-spacing: 0.08em; }
  .index-bar { overflow-x: auto; scrollbar-width: none; }
  .index-bar::-webkit-scrollbar { display: none; }
  .index-bar ol { width: max-content; }
  .index-bar li { flex: none; }
  .index-bar a { min-height: 50px; font-size: 14px; }
  .prod-figs .obj-stage { min-height: 0; padding: 18px 12px 24px; }
  .prod-figs .obj-img { max-height: 140px; }
  .prod-figs .obj.wide .obj-img { max-height: 200px; }
  .prod-figs .obj figcaption { padding: 8px 10px; font-size: 13px; gap: 8px; }
  .circuit-fig .pcb { padding: 10px 8px 4px; }
}
@media (max-width: 560px) {
  :root { --hdr: 64px; }
  .hero-h1 { font-size: 30px; line-height: 1.1; letter-spacing: -0.02em; }
  .page-head .hero-h1 { font-size: 30px; }
  .site-header.is-condensed { transform: none; }
  .hero-sheet .hero-copy { padding: 24px 16px 20px; }
  .hero-copy .hero-h1 { margin-bottom: 18px; }
  .hero-stage { padding: 44px 18px 48px; }
  .hero-hold .obj-img { max-height: 190px; }
}
@media (max-width: 380px) {
  .hero-h1 { font-size: 27px; }
}

/* ---------- reduced motion: instant states everywhere ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}

/* v2 round 1 fixes */
.protect-copy h2 { font-size: 34px; margin-bottom: 10px; }
.protect-lead { font-size: 16px; margin-bottom: 14px; }
.callout { padding: 9px 0 9px 18px; }
.callout h3 { font-size: 17px; }
.callout p { font-size: 14.5px; }
.protect-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; margin: 18px 0 0; }
.protect-cta .protect-skip { font-size: 14px; color: var(--muted); margin: 0; }
.motion .protect-cta a.protect-skip { display: inline; }
.hint-mob { display: none !important; }
.btn:disabled { opacity: 0.4; cursor: default; transform: none; box-shadow: none; }
@media (max-width: 1060px) {
  .motion .hint-desk { display: none !important; }
  .motion .hint-mob { display: inline !important; }
  .protect-copy > .protect-cta { order: 7; }
  .motion .protect-cta a.protect-skip { display: none; }
}
@media (max-width: 560px) { .hero-h1 { font-size: 27px; } }
@media (max-width: 380px) { .hero-h1 { font-size: 24px; } }
/* v2 round 2 */
.index-bar a em { white-space: normal; overflow: visible; text-overflow: clip; line-height: 1.25; }
.index-bar a { min-height: 64px; }
@media (max-width: 760px) { .index-bar a em { white-space: nowrap; } }
.stage-row.reached .sr-num { color: var(--ink); }
.stage-row .sr-num { transition: color 300ms ease; }
.motion .stage-list-wrap.has-draft .stage-row:not(.reached) .sr-num { color: var(--line-strong); }
/* v2 round 3 — tablet layouts */
@media (min-width: 861px) and (max-width: 1060px) {
  .hero-sheet { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); grid-template-areas: "copy obj" "strip strip"; }
  .hero-sheet .hero-copy { border-right: 1px solid var(--line-strong); border-bottom: 0; padding: 40px 32px 32px; }
  .hero-h1 { font-size: 40px; }
  .hero-stage { min-height: 0; padding: 60px 24px 60px; }
  .hero-hold .obj-img { max-height: 240px; }
}
@media (min-width: 761px) and (max-width: 1060px) {
  .protect-grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 28px; align-items: start; }
  .protect-copy { display: block; }
  .protect-sheet { margin-bottom: 0; }
  .protect-copy h2 { font-size: 28px; }
  .motion .callouts { display: grid; overflow: visible; scroll-snap-type: none; gap: 6px; }
  .motion .callout { flex: none; border: 0; border-left: 2px solid var(--line-strong); border-top: 0; padding: 8px 0 8px 14px; background: transparent; cursor: pointer; }
  .motion .protect.is-live .callout.act { border-left-color: var(--red); border-top-color: transparent; }
  .callout h3 { font-size: 16px; }
  .callout p { font-size: 14px; }
}
@media (min-width: 761px) and (max-width: 1060px) { .protect-sheet { order: 0; } }
/* hero fix: leader anchored to the pack outline; no value-less dimension marks */
.dim { display: none; }
.hero-stage .frame-ticks { inset: 16px; }
.leader { display: none; overflow: visible; }
.leader.is-set { display: block; }
.leader circle { fill: #FFFFFF; stroke: var(--ink); stroke-width: 1.5; }
.motion .leader path { stroke-dasharray: none; stroke-dashoffset: 0; animation: none; }

/* Final selected direction — quieter drawing-sheet rhythm, editorial concepts + real lab evidence. */
:root { --final-space: clamp(64px, 7vw, 112px); }
html { scroll-padding-top: 105px; }
body { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
.sec { padding-block: var(--final-space); }
.hero { padding: 32px 0 72px; }
.hero-sheet { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-template-areas: "copy obj" "strip strip"; }
.hero-sheet .hero-copy { padding: 56px 42px 48px; display:flex; flex-direction:column; justify-content:center; }
.hero-copy .hero-h1 { font-size:clamp(38px,4.2vw,58px); line-height:1.06; letter-spacing:-.045em; max-width:560px; }
.hero-copy .lead { display:block; font-size:18px; line-height:1.6; max-width:440px; }
.hero-label { font-size:11px; letter-spacing:.065em; }
.editorial { margin:0; min-width:0; display:flex; flex-direction:column; background:#F7F8FA; }
.editorial img { display:block; width:100%; height:auto; aspect-ratio:3/2; object-fit:contain; background:#F7F8FA; }
.editorial figcaption { margin:0; padding:12px 18px; border-top:1px solid var(--line); font-size:12px; color:var(--muted); line-height:1.5; letter-spacing:.015em; }
.hero-editorial { grid-area:obj; justify-content:center; background:#fff; }
.hero-editorial img { flex:1; min-height:0; object-fit:contain; background:#fff; }
.hero-editorial figcaption { border-top:0; padding:14px 22px; }
.spec-strip dd { font-size:14px; line-height:1.5; }
.spec-strip > div { padding:20px; }
.spec-strip dt { font-size:10px; }
.catalog-hero { padding-block:60px; border-bottom:1px solid var(--line); }
.catalog-head { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; }
.catalog-head h1 { font-size:clamp(36px,4vw,58px); line-height:1.08; letter-spacing:-.045em; margin:22px 0; max-width:620px; }
.catalog-head .lead { color:var(--muted); font-size:18px; line-height:1.65; margin-bottom:26px; max-width:550px; }
.catalog-head .editorial { border:1px solid var(--line); }
.ph-grid { align-items:center; }
.ph-grid .editorial { border:1px solid var(--line); }
.page-head .hero-h1 { font-size:clamp(36px,4vw,54px); line-height:1.1; max-width:620px; }
.page-head .lead { font-size:18px; line-height:1.65; }
.index-bar ol { flex-wrap:wrap; }
.index-bar a { padding:18px 20px; }
.capabilities { border-top:1px solid var(--ink); }
.capability { display:grid; grid-template-columns:1.2fr 1fr; gap:64px; padding:42px 0; border-bottom:1px solid var(--line-strong); scroll-margin-top:160px; }
.capability-intro { position:relative; padding-left:62px; }
.cap-num { position:absolute; left:0; top:2px; font-size:13px; color:var(--red); font-weight:700; letter-spacing:.1em; }
.capability h2 { font-size:27px; line-height:1.25; margin-bottom:12px; }
.capability p { max-width:480px; color:var(--muted); margin:0 0 18px; }
.capability a { font-size:14px; font-weight:600; text-underline-offset:5px; }
.requirement { border-left:1px solid var(--line); padding-left:36px; }
.requirement h3 { font-size:12px; text-transform:uppercase; letter-spacing:.08em; margin-bottom:14px; }
.requirement ul { padding-left:18px; margin:0; color:var(--muted); }
.requirement li { padding:4px 0; }
.project-close { display:flex; align-items:center; justify-content:space-between; gap:40px; }
.project-close h2 { max-width:760px; }
.project-close p { color:var(--muted); max-width:680px; }
.project-close > .btn { flex-shrink:0; }
.families { grid-template-columns:repeat(4,minmax(0,1fr)); gap:16px; }
.fam { min-height:270px; background:#fff; }
.fam-body { display:flex; flex-direction:column; height:100%; padding:26px 22px; }
.fam-links { margin-top:auto; padding-top:20px; gap:12px; }
.fam-code { font-size:10px; }
.fam h3 { font-size:22px; }
.process-note { padding:32px 18px; width:100%; margin:auto; }
.process-note h3 { font-size:28px; margin:28px 0; }
.process-note ol, .qc-checkpoint ol { list-style:none; padding:0; margin:0; counter-reset:point; }
.process-note li, .qc-checkpoint li { counter-increment:point; border-top:1px solid var(--line); padding:16px 0; font-size:16px; }
.process-note li::before,.qc-checkpoint li::before { content:"0" counter(point); color:var(--red); font-size:11px; margin-right:18px; }
.process-note > p:last-child { font-size:14px; color:var(--muted); margin-top:28px; }
.quality-note { width:100%; height:100%; display:flex; align-items:center; justify-content:center; gap:14px; }
.quality-note span { border-bottom:2px solid var(--red); padding:16px 0; font-size:12px; letter-spacing:.08em; font-weight:600; }
.lab-rooms { grid-template-columns:repeat(2,minmax(0,1fr)); }
.tests { grid-template-columns:repeat(3,minmax(0,1fr)); }
.tests .fig-media { height:270px; }
.tests .fig-media img { max-height:250px; }
.qc-checkpoint { padding:36px; background:#fff; border:1px solid var(--line-strong); }
.qc-checkpoint h3 { font-size:27px; margin-block:24px; }
.sec-head h2 { max-width:730px; }
.start h2 { max-width:750px; }
@media(min-width:1061px) { .hero-sheet .hero-copy { border-right:1px solid var(--line-strong); border-bottom:0; } }
@media(max-width:1060px) {
 .hero-sheet { grid-template-columns:1fr 1fr; grid-template-areas:"copy obj" "strip strip"; }
 .hero-sheet .hero-copy { padding:36px 28px; border-bottom:0; border-right:1px solid var(--line); }
 .hero-copy .hero-h1 { font-size:42px; }
 .catalog-head { gap:32px; }
 .families { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .capability { gap:32px; }
 .tests { grid-template-columns:repeat(3,minmax(0,1fr)); }
}
@media(max-width:760px) {
 .hero { padding:20px 0 48px; }
 .hero-sheet { grid-template-columns:1fr; grid-template-areas:"copy" "obj" "strip"; }
 .hero-sheet .hero-copy { padding:32px 24px; border:0; }
 .hero-copy .hero-h1 { font-size:40px; max-width:500px; }
 .hero-copy .lead { display:block; font-size:17px; margin-bottom:22px; }
 .hero-note { font-size:12px; line-height:1.6; margin-top:18px; }
 .hero-label { font-size:10px; flex-wrap:wrap; }
 .hero-editorial img { max-height:340px; }
 .spec-strip { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .spec-strip > div { padding:16px; border-bottom:1px solid var(--line); }
 .spec-strip > div:nth-child(2n) { border-right:0; }
 .spec-strip > div:last-child { grid-column:1/-1; border-bottom:0; }
 .catalog-hero { padding-block:36px; }
 .catalog-head { grid-template-columns:1fr; gap:32px; }
 .catalog-head h1 { font-size:40px; }
 .catalog-head .lead { font-size:17px; }
 .capability { grid-template-columns:1fr; padding-block:32px; gap:24px; }
 .capability-intro { padding-left:42px; }
 .capability h2 { font-size:25px; }
 .requirement { padding-left:42px; border-left:0; }
 .project-close { display:block; }
 .project-close > .btn { margin-top:18px; }
 .families { grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
 .fam { min-height:300px; }
 .fam-body { padding:22px 18px; }
 .fam h3 { font-size:21px; }
 .fam-links { flex-direction:column; align-items:flex-start; }
 .tests { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .lab-rooms { grid-template-columns:1fr; }
 .page-head .ph-grid { gap:28px; }
 .page-head .hero-h1 { font-size:38px; }
 .process-note { padding:20px 8px; }
 .qc-checkpoint { padding:26px; }
}
@media(max-width:480px) {
 .hero-sheet .hero-copy { padding:28px 18px; }
 .hero-copy .hero-h1 { font-size:37px; }
 .catalog-head h1 { font-size:37px; }
 .families { grid-template-columns:1fr; }
 .fam { min-height:0; }
 .fam-body { padding:24px; }
 .fam-links { flex-direction:row; }
 .index-bar a { padding:14px 12px; }
 .index-bar em { font-size:12px; }
 .page-head .hero-h1 { font-size:36px; }
 .tests .fig-media { height:230px; }
 .tests .fig-media img { max-height:210px; }
}
@media(max-width:760px) { .spec-strip > div { display:block; } .spec-strip dt { margin:0 0 6px; } }
/* Keep circuit discovery deliberate: no long pinned scroll corridor. */
@media(min-width:1061px) {
 .motion .protect-track { height:auto; }
 .motion .protect-sticky { position:static; height:auto; padding:0; }
 .motion .protect-steps { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-top:18px; }
 .motion .ps-draw .pcb { max-height:none; }
}

.noscript-note { padding-block:20px; font-size:14px; }
.noscript-note p { margin-block:8px; }

/* Source-grounded photo correction: retain image geometry and native detail limits. */
.editorial.real-photo img { aspect-ratio:auto; max-width:640px; margin:auto; object-fit:contain; }
.hero-editorial.real-photo img { flex:0 1 auto; width:100%; height:auto; padding:18px; }
.editorial.source-diagram img { aspect-ratio:900/640; max-width:640px; margin:auto; padding:18px; background:#fff; }
.catalog-head .real-photo { background:#fff; }
@media(max-width:760px) { .hero-editorial.real-photo img { max-height:none; padding:12px; } }

/* Source-verified product coverage: one battery format, two charger designs. */
.product-showcase { border-bottom:1px solid var(--line); }
.product-trio { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:22px; }
.product-showcase-card,.charger-example { background:#fff; border:1px solid var(--line-strong); min-width:0; }
.product-photo { margin:0; background:#fff; min-width:0; }
.product-photo-stage { display:flex; align-items:center; justify-content:center; height:260px; padding:26px; background:#fff; overflow:hidden; }
.product-photo img { display:block; width:100%; height:100%; object-fit:contain; max-width:640px; }
.product-photo figcaption { color:var(--muted); font-size:12px; line-height:1.5; padding:12px 20px; border-top:1px solid var(--line); }
.product-showcase-copy { padding:24px 24px 28px; border-top:1px solid var(--line); }
.product-showcase-copy h3 { font-size:24px; margin-bottom:12px; }
.product-showcase-copy p { font-size:15px; color:var(--muted); min-height:48px; margin-bottom:20px; }
.product-showcase-copy a { font-size:14px; font-weight:600; text-underline-offset:5px; }
.pack-details-grid,.charger-examples-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:24px; }
.pack-details-grid .product-photo { border:1px solid var(--line-strong); }
.pack-details-grid .product-photo-stage { height:290px; }
.pack-closeup img { width:100%; height:100%; object-fit:cover; }
.pack-closeup-lead img { object-position:left center; }
.pack-closeup-body img { object-position:right center; }
.product-detail-note { display:flex; justify-content:space-between; gap:40px; align-items:center; margin-top:30px; }
.product-detail-note p { color:var(--muted); max-width:700px; margin:0; font-size:15px; }
.product-detail-note .btn { flex-shrink:0; }
.charger-examples-grid .product-photo-stage { height:320px; padding:32px; }
.charger-example-copy { border-top:1px solid var(--line); padding:24px 28px; }
.charger-example-copy h3 { font-size:25px; margin-bottom:12px; }
.charger-example-copy p { color:var(--muted); font-size:15px; margin:0; }
@media(max-width:1060px){ .product-trio { gap:14px; } .product-showcase-copy { padding:20px 18px; } .product-showcase-copy h3 { font-size:21px; } .product-photo-stage { height:210px; padding:18px; } .product-detail-note { display:block; } .product-detail-note .btn { margin-top:20px; } }
@media(max-width:760px){ .product-trio { grid-template-columns:1fr; gap:24px; } .product-showcase-card { display:grid; grid-template-columns:1fr; } .product-photo-stage { height:240px; padding:24px; } .product-showcase-copy p { min-height:0; } .pack-details-grid,.charger-examples-grid { grid-template-columns:1fr; } .pack-details-grid .product-photo-stage { height:250px; } .charger-examples-grid .product-photo-stage { height:260px; padding:24px; } }

.battery-interface-note { padding:32px; background:#fff; border:1px solid var(--line-strong); }
.battery-interface-note h3 { font-size:27px; margin:22px 0; }
.battery-interface-note ul { color:var(--muted); padding-left:18px; font-size:16px; }
.battery-interface-note li { margin:12px 0; }
.battery-interface-note > p:last-child { color:var(--muted); font-size:14px; margin-top:26px; }

/* Eight-source-photo edition: a selected home set and an accessible product gallery. */
.families.is-filtered .fam { opacity:1; transform:none; transition:border-color 260ms ease, box-shadow 360ms var(--ease); }
.product-selection-five { grid-template-columns:repeat(6,minmax(0,1fr)); }
.product-selection-five > article { grid-column:span 2; }
.product-selection-five > article:nth-child(-n+2) { grid-column:span 3; }
.product-selection-five > article:nth-child(-n+2) .product-photo-stage { height:300px; }
.product-selection-five .product-showcase-copy p { min-height:0; }
.product-gallery { background:#fff; border:1px solid var(--line-strong); }
.pg-stage { min-width:0; }
.pg-slide { margin:0; }
.pg-slide[hidden] { display:none; }
.pg-image { height:420px; padding:30px 40px; display:flex; justify-content:center; align-items:center; background:#fff; }
.pg-image img { max-width:100%; max-height:100%; width:auto; height:auto; object-fit:contain; }
.pg-slide figcaption { display:flex; justify-content:space-between; align-items:center; gap:24px; padding:18px 26px; border-top:1px solid var(--line); color:var(--muted); font-size:13px; }
.pg-label { font-weight:600; color:var(--ink); font-size:15px; }
.pg-thumbs { display:none; }
.js .pg-thumbs { display:grid; grid-template-columns:repeat(6,minmax(0,1fr)); gap:0; border-top:1px solid var(--line); }
.pg-thumb { padding:14px 10px 16px; background:#fff; border:0; border-right:1px solid var(--line); font:inherit; cursor:pointer; text-align:center; min-width:0; color:var(--muted); }
.pg-thumb:last-child { border-right:0; }
.pg-thumb img { width:100%; height:76px; object-fit:contain; margin-bottom:12px; }
.pg-thumb span { display:block; font-size:12px; line-height:1.4; }
.pg-thumb[aria-pressed=true] { background:#FFF4F4; box-shadow:inset 0 -3px var(--red); color:var(--ink); }
.pg-thumb:hover { background:#F7F8FA; }
.pg-thumb:focus-visible { outline:2px solid var(--red); outline-offset:-5px; }
.gallery-notes { margin-top:24px; display:grid; grid-template-columns:1fr 1fr; gap:18px 32px; align-items:start; }
.gallery-notes p { font-size:14px; color:var(--muted); margin:0; }
.gallery-notes .btn { justify-self:start; grid-column:1/-1; margin-top:4px; }
@media(max-width:1060px){ .pg-image { height:380px; } .product-selection-five > article:nth-child(-n+2) .product-photo-stage { height:260px; } }
@media(max-width:760px){
 .product-selection-five { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
 .product-selection-five > article,.product-selection-five > article:nth-child(-n+2) { grid-column:auto; }
 .product-selection-five > article:first-child { grid-column:1/-1; }
 .product-selection-five .product-photo-stage,.product-selection-five > article:nth-child(-n+2) .product-photo-stage { height:190px; padding:16px; }
 .product-selection-five > article:first-child .product-photo-stage { height:180px; }
 .product-selection-five .product-showcase-copy { padding:20px 16px; }
 .product-selection-five .product-showcase-copy h3 { font-size:21px; }
 .product-selection-five .product-showcase-copy p { font-size:14px; line-height:1.55; }
 .product-selection-five .product-photo figcaption { padding:12px; font-size:11px; }
 .pg-image { height:300px; padding:24px; }
 .pg-slide figcaption { display:block; padding:18px; font-size:12px; }
 .pg-label { display:block; margin-bottom:8px; }
 .js .pg-thumbs { grid-template-columns:repeat(3,minmax(0,1fr)); }
 .pg-thumb { padding:14px 8px; border-bottom:1px solid var(--line); }
 .pg-thumb img { height:60px; margin-bottom:8px; }
 .pg-thumb:nth-child(3n) { border-right:0; }
 .gallery-notes { grid-template-columns:1fr; gap:14px; }
}

/* Visible product photographs within battery categories */
.cap-photos{grid-column:1/-1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:-24px}
.cap-photos-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.cap-photos-1{grid-template-columns:1fr;max-width:620px;width:100%;justify-self:center}
.cap-photos figure{margin:0;min-width:0;background:#fff;border:1px solid var(--line-strong)}
.cap-photo-image{height:220px;display:flex;align-items:center;justify-content:center;padding:24px}
.cap-photo-image img{width:100%;height:100%;object-fit:contain}
.cap-photos figcaption{padding:16px 20px;border-top:1px solid var(--line-strong);font-size:13px;color:var(--muted)}
@media(max-width:700px){.cap-photos,.cap-photos-3{grid-template-columns:1fr;gap:16px;margin-top:0}.cap-photo-image{height:210px;padding:20px}.cap-photos-3 .cap-photo-image{height:250px}}