/* AToA site. Tokens from knh-3d-printing/funding/grant_finder/mockups/DESIGN.md (Apple web spec)
   with the measured deviations in DESIGN-ADAPTATION.md: #6e6e73 muted text, Geist, per-font tracking. */
:root {
  --primary: #0066cc;
  --primary-focus: #0071e3;
  --primary-on-dark: #2997ff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --muted-on-dark: #a1a1a6;
  --hairline: #e0e0e0;
  --control-edge: #84848a;
  --canvas: #ffffff;
  --parchment: #f5f5f7;
  --tile-1: #272729;
  --tile-2: #2a2a2c;
  --black: #000000;
  --font: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --r-sm: 8px;
  --r-lg: 18px;
  --wrap: 1080px;
  --gutter: 22px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 400 17px/1.47 var(--font);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--primary-focus); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.center { text-align: center; }

/* ---------- global nav ---------- */
.gnav { position: sticky; top: 0; z-index: 50; background: rgba(0,0,0,.86); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); }
.gnav .wrap { height: 48px; display: flex; align-items: center; gap: 28px; }
.gnav .brand { color: #fff; font-weight: 600; font-size: 15px; letter-spacing: .02em; white-space: nowrap; }
.gnav .brand span { color: var(--muted-on-dark); font-weight: 400; margin-left: 6px; }
.gnav nav { display: flex; gap: 24px; margin-left: auto; align-items: center; }
.gnav nav a { color: #e8e8ed; font-size: 13px; }
.gnav nav a:hover, .gnav nav a[aria-current="page"] { color: #fff; text-decoration: none; }
.gnav nav a[aria-current="page"] { font-weight: 600; }
.gnav .menu-btn { display: none; margin-left: auto; background: none; border: 0; color: #fff; font: inherit; font-size: 14px; padding: 12px 0; cursor: pointer; }

/* ---------- tiles ---------- */
.tile { padding: 96px 0; }
.tile.tight { padding: 64px 0; }
.tile.light { background: var(--canvas); }
.tile.parchment { background: var(--parchment); }
.tile.dark { background: var(--tile-1); color: #fff; }
.tile.dark-2 { background: var(--tile-2); color: #fff; }
.tile.black { background: var(--black); color: #fff; }
.dark a, .dark-2 a, .black a { color: var(--primary-on-dark); }
.dark .muted, .dark-2 .muted, .black .muted { color: var(--muted-on-dark); }

.eyebrow { font-size: 14px; font-weight: 600; letter-spacing: .01em; color: var(--muted); margin: 0 0 10px; }
.dark .eyebrow, .dark-2 .eyebrow, .black .eyebrow { color: var(--muted-on-dark); }
.eyebrow.new { color: #bf4800; }
.black .eyebrow.new, .dark .eyebrow.new { color: #ff9f40; }

h1, h2, h3 { margin: 0; font-weight: 600; }
.hero-title { font-size: clamp(40px, 7vw, 80px); line-height: 1.05; letter-spacing: -0.6px; }
.display { font-size: clamp(32px, 5vw, 56px); line-height: 1.07; letter-spacing: -0.6px; }
.display-sm { font-size: clamp(28px, 3.6vw, 40px); line-height: 1.1; letter-spacing: -0.4px; }
.lead { font-size: clamp(19px, 2.2vw, 24px); line-height: 1.4; font-weight: 400; margin: 18px 0 0; }
.tagline { font-size: 21px; line-height: 1.25; font-weight: 600; }
.muted { color: var(--muted); }
.caption { font-size: 14px; line-height: 1.43; }
.fine { font-size: 12px; line-height: 1.4; }
p { margin: 14px 0 0; }
.measure { max-width: 720px; }
.center .measure { margin-left: auto; margin-right: auto; }

/* ---------- buttons ---------- */
.ctas { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.center .ctas { justify-content: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 11px 22px; border-radius: 9999px; font: 400 17px/1 var(--font); border: 1px solid transparent; cursor: pointer; transition: transform .1s; }
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: #0077ed; }
.btn.ghost { background: transparent; color: var(--primary); border-color: var(--primary); }
.dark .btn.ghost, .black .btn.ghost, .dark-2 .btn.ghost { color: var(--primary-on-dark); border-color: var(--primary-on-dark); }
.link-arrow::after { content: " \203A"; }

/* ---------- grids and cards ---------- */
.grid { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--canvas); border: 1px solid var(--hairline); border-radius: var(--r-lg); padding: 28px; }
.parchment .card { border-color: transparent; }
.dark .card, .black .card, .dark-2 .card { background: #1d1d1f; border-color: #3a3a3c; color: #fff; }
.card h3 { font-size: 21px; line-height: 1.24; }
.card p { font-size: 16px; }
.card .status { font-size: 12px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.card .status.live { color: #1d7a3a; }
.card .status.new { color: #bf4800; }
.card.link { display: block; color: inherit; }
.card.link:hover { text-decoration: none; border-color: var(--control-edge); }
.card.link .more { color: var(--primary); display: inline-block; margin-top: 14px; }

.stat .num { font-size: clamp(36px, 4.5vw, 52px); font-weight: 600; letter-spacing: -0.6px; line-height: 1; }
.stat p { font-size: 15px; margin-top: 10px; }
.stat .src { font-size: 12px; color: var(--muted); margin-top: 10px; display: block; }
.dark .stat .src, .black .stat .src { color: var(--muted-on-dark); }

.steps { counter-reset: s; }
.step { position: relative; padding-top: 40px; }
.step::before { counter-increment: s; content: counter(s); position: absolute; top: 0; left: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--ink); color: #fff; font-size: 14px; font-weight: 600; display: grid; place-items: center; }
.dark .step::before, .black .step::before { background: #fff; color: var(--ink); }
.step h3 { font-size: 19px; }
.step p { font-size: 15px; }
.step .time { font-size: 13px; font-weight: 600; color: var(--primary); margin-top: 8px; display: block; }
.dark .step .time, .black .step .time { color: var(--primary-on-dark); }

/* ---------- 3D viewer ---------- */
.viewer { position: relative; width: 100%; aspect-ratio: 5 / 4; max-height: 78vh; margin: 36px auto 0; }
.viewer model-viewer { width: 100%; height: 100%; background: transparent; --poster-color: transparent; --progress-bar-color: var(--primary-on-dark); }
.viewer .hint { position: absolute; bottom: 8px; left: 0; right: 0; text-align: center; font-size: 12px; color: var(--muted-on-dark); pointer-events: none; }
.seg { display: inline-flex; flex-wrap: wrap; justify-content: center; gap: 4px; padding: 4px; border-radius: 9999px; background: #1d1d1f; margin-top: 28px; }
.seg button { font: 400 14px/1 var(--font); color: #e8e8ed; background: transparent; border: 0; border-radius: 9999px; padding: 10px 16px; min-height: 40px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: #f5f5f7; color: var(--ink); font-weight: 600; }
.explain { max-width: 640px; margin: 22px auto 0; min-height: 4.4em; font-size: 17px; color: #e8e8ed; }
.legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px; margin-top: 18px; font-size: 13px; color: var(--muted-on-dark); list-style: none; padding: 0; }
.legend li { display: inline-flex; align-items: center; gap: 7px; }
.legend i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }

/* ---------- feature split ---------- */
.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.split.flip > :first-child { order: 2; }

/* ---------- banner ---------- */
.banner { background: #fff4e5; color: var(--ink); font-size: 15px; }
.banner .wrap { padding-top: 14px; padding-bottom: 14px; }
.banner[hidden] { display: none; }

/* ---------- evidence list ---------- */
.refs { list-style: none; padding: 0; margin: 28px 0 0; }
.refs li { padding: 20px 0; border-top: 1px solid var(--hairline); }
.refs li:last-child { border-bottom: 1px solid var(--hairline); }
.refs .finding { font-size: 17px; font-weight: 600; line-height: 1.35; }
.refs .cite { font-size: 14px; color: var(--muted); margin-top: 6px; }
.refs .why { font-size: 15px; margin-top: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.chips button { font: 400 14px/1 var(--font); padding: 10px 16px; min-height: 40px; border-radius: 9999px; border: 1px solid var(--control-edge); background: #fff; color: var(--ink); cursor: pointer; }
.chips button[aria-pressed="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }

/* ---------- form ---------- */
form.case { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
form.case .full { grid-column: 1 / -1; }
form.case label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
form.case input, form.case select, form.case textarea { width: 100%; font: 400 17px/1.3 var(--font); color: var(--ink); background: #fff; border: 1px solid var(--control-edge); border-radius: var(--r-sm); padding: 11px 14px; min-height: 44px; }
form.case textarea { min-height: 120px; resize: vertical; }
form.case .note { font-size: 13px; color: var(--muted); }
form.case .actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- table ---------- */
.table { width: 100%; border-collapse: collapse; margin-top: 24px; font-size: 15px; }
.table th, .table td { text-align: left; padding: 12px 10px 12px 0; border-top: 1px solid var(--hairline); vertical-align: top; }
.table th { font-weight: 600; width: 32%; }
.dark .table th, .dark .table td, .black .table th, .black .table td { border-color: #3a3a3c; }

/* ---------- footer ---------- */
footer { background: var(--parchment); color: #424245; font-size: 12px; line-height: 1.5; padding: 40px 0 56px; }
footer .cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
footer h4 { font-size: 12px; font-weight: 600; margin: 0 0 8px; color: var(--ink); }
footer a { color: #424245; display: block; padding: 3px 0; }
footer .legal { border-top: 1px solid #d2d2d7; margin-top: 28px; padding-top: 16px; color: var(--muted); text-align: center; }
footer .legal p { margin: 4px 0 0; }


/* ---------- nav CTA and sub-nav ---------- */
.gnav nav a.cta { background: var(--primary); color: #fff; padding: 6px 13px; border-radius: 9999px; font-size: 12px; }
.gnav nav a.cta:hover { background: #0077ed; }
.subnav { position: sticky; top: 48px; z-index: 40; background: rgba(245,245,247,.86); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid #d2d2d7; }
.subnav .wrap { height: 52px; display: flex; align-items: center; gap: 24px; }
.subnav .title { font-size: 21px; font-weight: 600; letter-spacing: -0.2px; white-space: nowrap; }
.subnav nav { display: flex; gap: 22px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.subnav nav::-webkit-scrollbar { display: none; }
.subnav nav a { color: var(--ink); font-size: 13px; white-space: nowrap; }
.btn.small { min-height: 30px; padding: 6px 14px; font-size: 13px; }
[id] { scroll-margin-top: 110px; }

/* ---------- step viewer ---------- */
.stepper-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 28px; }
.stepper-steps button { text-align: left; font: inherit; color: inherit; background: #1d1d1f; border: 1px solid #3a3a3c; border-radius: 14px; padding: 16px; cursor: pointer; min-height: 44px; }
.light .stepper-steps button, .parchment .stepper-steps button { background: #fff; border-color: var(--hairline); }
.stepper-steps button .n { font-size: 12px; font-weight: 600; color: var(--muted-on-dark); display: block; }
.light .stepper-steps button .n, .parchment .stepper-steps button .n { color: var(--muted); }
.stepper-steps button .t { font-size: 16px; font-weight: 600; display: block; margin-top: 4px; }
.stepper-steps button[aria-pressed="true"] { border-color: var(--primary-on-dark); box-shadow: inset 0 0 0 1px var(--primary-on-dark); }
.light .stepper-steps button[aria-pressed="true"], .parchment .stepper-steps button[aria-pressed="true"] { border-color: var(--primary); box-shadow: inset 0 0 0 1px var(--primary); }
.stepper .explain { text-align: center; }
.light .explain, .parchment .explain { color: var(--ink); }

/* ---------- image cards and figures ---------- */
.card.media { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.card.media .img { background: var(--parchment); height: 230px; display: flex; align-items: center; justify-content: center; padding: 20px; }
.parchment .card.media .img { background: #fbfbfd; }
.dark .card.media .img, .black .card.media .img { background: #111; }
.card.media .img img { width: 100%; height: 100%; object-fit: contain; }
.card.media .body { padding: 22px 26px 28px; }
.figure { display: grid; place-items: center; }
.figure img { max-height: 520px; width: auto; }
.figure figcaption, .fig-cap { font-size: 12px; color: var(--muted); margin-top: 10px; text-align: center; }
.black .fig-cap, .dark .fig-cap { color: var(--muted-on-dark); }
.strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; align-items: end; margin-top: 44px; }
.strip figure { margin: 0; text-align: center; }
.strip img { height: 200px; width: 100%; object-fit: contain; margin: 0 auto; }
.strip figcaption { font-size: 13px; margin-top: 12px; }
.strip figcaption b { display: block; font-size: 15px; }
@media (max-width: 1000px) { .gnav nav { gap: 16px; } .gnav .brand span { display: none; } }
@media (max-width: 900px) { .stepper-steps, .strip { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 720px) {
  .subnav .title { font-size: 17px; }
  .subnav nav { display: none; }
  .subnav .wrap { justify-content: space-between; }
  .gnav nav a.cta { margin-top: 12px; text-align: center; padding: 12px; font-size: 17px; border-bottom: 0; }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .g3, .g4 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split.flip > :first-child { order: 0; }
  footer .cols { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  :root { --gutter: 16px; }
  .tile { padding: 64px 0; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .gnav .menu-btn { display: block; }
  .gnav nav { display: none; position: absolute; top: 48px; left: 0; right: 0; flex-direction: column; gap: 0; background: #000; padding: 8px var(--gutter) 16px; }
  .gnav nav.open { display: flex; }
  .gnav nav a { font-size: 17px; padding: 12px 0; border-bottom: 1px solid #2a2a2c; }
  form.case { grid-template-columns: 1fr; }
  .viewer { aspect-ratio: 1 / 1; }
  .table th { width: 40%; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn:active { transform: none; } }

/* ---------- FAQ ---------- */
.faq { margin-top: 32px; border-top: 1px solid var(--hairline); }
.faq details { border-bottom: 1px solid var(--hairline); padding: 18px 0; }
.faq summary { font-size: 19px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--primary); font-weight: 400; font-size: 24px; line-height: 1; }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin-top: 10px; color: #424245; }
.upload-frame { width: 100%; min-height: 560px; border: 1px solid var(--hairline); border-radius: var(--r-lg); background: #fff; }