@font-face {
  font-family: AntonLocal;
  src: url("assets/fonts/Anton-Regular.ttf") format("truetype");
  font-display: swap;
}

@font-face {
  font-family: CutiveLocal;
  src: url("assets/fonts/Cutive-Regular.ttf") format("truetype");
  font-display: swap;
}

:root {
  --page-width: 1080px;
  --ink: #fffdf3;
  --muted: #b9c1d4;
  --blue: #165ed0;
  --blue-bright: #5da4ff;
  --panel: rgba(6, 15, 47, .82);
  --panel-strong: rgba(3, 9, 31, .94);
  --line: rgba(99, 146, 255, .34);
  --red: #ff3c4d;
  --amber: #ffbd45;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: #02061b;
}

body {
  margin: 0;
  min-width: 320px;
  background: #02061b;
  color: var(--ink);
  font-family: CutiveLocal, Georgia, serif;
}

img { display: block; max-width: 100%; }
a { color: inherit; }
button { color: inherit; font: inherit; }

::selection { background: var(--blue); color: #fff; }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 12px 16px;
  background: #fff;
  color: #02061b;
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.page {
  position: relative;
  isolation: isolate;
  width: min(100%, var(--page-width));
  min-height: 100vh;
  margin: 0 auto;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(1, 4, 23, .08), rgba(1, 4, 23, .54) 45%, rgba(1, 4, 23, .68) 100%),
    url("assets/background/Hintergrund.webp") top center / 1120px auto repeat-y,
    #02061b;
  box-shadow: 0 0 70px rgba(0, 0, 0, .7);
}

.page::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 76% 4%, rgba(24, 83, 190, .3), transparent 18%),
    radial-gradient(circle at 15% 22%, rgba(28, 101, 220, .16), transparent 24%);
  pointer-events: none;
}

.site-header {
  padding: 24px 34px 0;
}

.top-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  width: min(100%, 860px);
  margin: 0 auto;
}

.site-button {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 70px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border: 1px solid rgba(120, 181, 255, .82);
  background:
    linear-gradient(180deg, rgba(27, 93, 208, .88), rgba(4, 20, 72, .88) 48%, rgba(2, 7, 29, .94)),
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, .26), transparent 44%);
  box-shadow: 0 0 20px rgba(47, 111, 255, .3), inset 0 1px 0 rgba(255, 255, 255, .24);
  overflow: hidden;
  font-family: AntonLocal, Impact, sans-serif;
  text-decoration: none;
  transition: transform .18s ease, filter .18s ease;
}

.site-button::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(255, 255, 255, .14);
  pointer-events: none;
}

.site-button:hover,
.site-button:focus-visible {
  transform: translateY(-2px);
  filter: drop-shadow(0 0 14px rgba(86, 160, 255, .8));
  outline: none;
}

.button-kicker,
.button-title {
  position: relative;
  z-index: 1;
  display: block;
  text-align: center;
  text-transform: uppercase;
  text-shadow: 0 0 10px rgba(0, 0, 0, .9);
}

.button-kicker {
  margin-bottom: 2px;
  color: #89c6ff;
  font-family: CutiveLocal, Georgia, serif;
  font-size: 11px;
  line-height: 1;
}

.button-title { font-size: 27px; line-height: 1; }

.safety-banner {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin: 26px 34px 0;
  padding: 23px 26px;
  border: 2px solid rgba(255, 74, 87, .84);
  background:
    linear-gradient(90deg, rgba(116, 6, 22, .96), rgba(34, 3, 14, .96)),
    #35040d;
  box-shadow: 0 0 28px rgba(255, 44, 69, .24), inset 0 0 22px rgba(255, 80, 96, .08);
}

.safety-banner h2 {
  margin: 0 0 9px;
  color: #ff6c79;
  font-size: 30px;
  line-height: 1;
}

.safety-banner p {
  margin: 0;
  color: #fff2f3;
  font-size: 12px;
  line-height: 1.6;
}

.safety-banner p + p { margin-top: 8px; }

.hero {
  position: relative;
  min-height: 620px;
  padding: 82px 40px 70px;
}

.hero::after {
  content: "";
  position: absolute;
  right: -15%;
  bottom: 0;
  width: 74%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--blue-bright), transparent);
  box-shadow: 0 0 18px var(--blue);
}

.hero-copy { position: relative; z-index: 3; width: 58%; }

.eyebrow,
.step-kicker,
.section-number {
  margin: 0 0 12px;
  color: #82bbff;
  font-family: CutiveLocal, Georgia, serif;
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1, h2, h3, h4 {
  margin-top: 0;
  font-family: AntonLocal, Impact, sans-serif;
  font-weight: 400;
  text-transform: uppercase;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(72px, 10vw, 112px);
  line-height: .96;
  text-shadow: 0 0 18px rgba(255, 255, 255, .18);
}

h1 span,
.footer-copy span { color: var(--blue); }

.hero-lead {
  max-width: 575px;
  margin: 0;
  color: #e8e8e4;
  font-size: 17px;
  line-height: 1.55;
  text-shadow: 0 0 8px #000;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 30px;
}

.hero-actions .site-button { min-width: 240px; }

.text-link {
  color: #d8e7ff;
  font-size: 13px;
  line-height: 1.4;
  text-underline-offset: 5px;
}

.hero-art {
  position: absolute;
  z-index: 1;
  top: 48px;
  right: 30px;
  width: 41%;
  height: 455px;
  pointer-events: none;
}

.hero-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 0 26px rgba(23, 76, 207, .48));
}

.hero-stamp {
  position: absolute;
  z-index: 2;
  right: -5px;
  bottom: 0;
  width: 112px;
  transform: rotate(7deg);
  filter: drop-shadow(0 0 12px rgba(58, 128, 255, .52));
}

.intro-panel {
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  gap: 50px;
  margin: 0 34px 34px;
  padding: 34px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(15, 48, 119, .62), rgba(2, 9, 34, .88));
  box-shadow: 0 0 24px rgba(31, 88, 209, .18);
}

.intro-panel h2,
.section-heading h2,
.final-checks > div > h2 {
  margin-bottom: 0;
  font-size: clamp(48px, 7vw, 76px);
  line-height: .93;
}

.section-number { color: var(--blue-bright); font-size: 24px; }
.intro-copy > p { margin: 2px 0 15px; line-height: 1.65; }
.intro-copy a { color: #8dc5ff; text-underline-offset: 4px; }

.reference-links { display: grid; gap: 10px; }

.reference-links a {
  padding: 13px 15px;
  border-left: 3px solid var(--blue-bright);
  background: rgba(7, 23, 69, .72);
  color: #d7e8ff;
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
}

.reference-links a:hover,
.reference-links a:focus-visible { background: rgba(18, 61, 147, .78); }

.tools-card {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  gap: 50px;
  margin-top: 4px;
  padding: 28px;
  border: 1px solid rgba(118, 180, 255, .46);
  background: rgba(2, 10, 37, .62);
}

.tools-card h3 {
  margin: 0;
  font-size: 38px;
  line-height: 1;
}

.tools-card ul {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: #e1e6ef;
  font-size: 13px;
  line-height: 1.55;
}

.tools-card li {
  position: relative;
  padding-left: 25px;
}

.tools-card li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #70b5ff;
  font-weight: 700;
}

.psu-card {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  gap: 50px;
  margin-top: 4px;
  padding: 28px;
  border: 1px solid rgba(255, 189, 69, .5);
  background: linear-gradient(135deg, rgba(92, 56, 8, .28), rgba(2, 10, 37, .72));
}

.psu-card h3 {
  margin: 0;
  font-size: 38px;
  line-height: 1;
}

.psu-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.psu-options article {
  padding: 18px;
  border-top: 2px solid var(--amber);
  background: rgba(2, 9, 32, .58);
}

.psu-options span {
  color: #ffd887;
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.psu-options h4 {
  margin: 8px 0 10px;
  font-size: 24px;
  line-height: 1;
}

.psu-options p {
  margin: 0;
  color: #d9dde5;
  font-size: 11px;
  line-height: 1.6;
}

.psu-options a { color: #8dc5ff; text-underline-offset: 3px; }

.callout {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin: 0 34px 80px;
  padding: 24px 26px;
  border: 1px solid rgba(255, 74, 87, .68);
  background: linear-gradient(90deg, rgba(103, 8, 22, .85), rgba(29, 4, 15, .9));
  box-shadow: 0 0 24px rgba(255, 44, 69, .16);
}

.callout-icon {
  flex: 0 0 42px;
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  color: var(--red);
  font-family: AntonLocal, Impact, sans-serif;
  font-size: 28px;
}

.callout h2,
.callout h4 { margin: 0 0 5px; color: #ff6270; font-size: 26px; }
.callout p { margin: 0; font-size: 14px; line-height: 1.55; }

.callout.compact {
  margin: 24px 0 0;
  padding: 18px;
}

.callout.compact .callout-icon { flex-basis: 32px; width: 32px; height: 32px; font-size: 21px; }
.callout.compact h4 { font-size: 22px; }

.guide,
.calibration,
.final-checks,
.references { padding: 0 34px 90px; }

.section-heading {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  align-items: end;
  gap: 50px;
  margin-bottom: 34px;
}

.section-heading > p {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.step-card {
  position: relative;
  display: grid;
  grid-template-columns: 105px 1fr;
  gap: 24px;
  margin-bottom: 22px;
  padding: 30px;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(7, 23, 67, .86), rgba(2, 8, 29, .92));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .04), 0 14px 35px rgba(0, 0, 0, .18);
}

.step-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 82px;
  height: 3px;
  background: var(--blue-bright);
  box-shadow: 0 0 12px var(--blue-bright);
}

.step-index {
  color: rgba(104, 168, 255, .92);
  font-family: AntonLocal, Impact, sans-serif;
  font-size: 72px;
  line-height: 1;
}

.step-content h3 { margin-bottom: 14px; font-size: 36px; line-height: 1; }
.step-content > p { margin: 0; color: #e0e2e5; font-size: 15px; line-height: 1.65; }

.inline-note {
  margin-top: 20px;
  padding: 15px 17px;
  border-left: 3px solid var(--blue-bright);
  background: rgba(21, 74, 168, .2);
  color: #dbeaff;
  font-size: 14px;
  line-height: 1.55;
}

.inline-note-warning { border-color: var(--amber); background: rgba(138, 81, 8, .18); color: #fff0cf; }

.step-card-media {
  grid-template-columns: 105px minmax(0, 1fr) minmax(240px, 34%);
}

.step-card-media .step-content { min-width: 0; }
.step-card-media .reference-figure-wide { grid-column: 2 / 4; }

.section-return {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: fit-content;
  margin: 28px 0 0 auto;
  padding: 11px 16px;
  border: 1px solid rgba(120, 181, 255, .62);
  background: linear-gradient(180deg, rgba(19, 67, 157, .58), rgba(2, 9, 34, .8));
  color: #9fcaff;
  font-size: 12px;
  text-decoration: none;
  text-underline-offset: 5px;
}

.section-return:hover,
.section-return:focus-visible {
  color: #fff;
  border-color: #9fcaff;
  box-shadow: 0 0 16px rgba(66, 135, 255, .3);
  outline: none;
}

.substeps {
  display: grid;
  gap: 13px;
  margin: 0;
  padding-left: 21px;
  color: #e0e2e5;
  font-size: 14px;
  line-height: 1.6;
}

.check-list {
  display: grid;
  gap: 10px;
  margin: 21px 0 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  line-height: 1.5;
}

.check-list li { position: relative; padding-left: 27px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: #70b5ff; font-weight: 700; }

.reference-figure { margin: 0; align-self: start; }

.image-button {
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid rgba(112, 176, 255, .6);
  background: #04091b;
  cursor: zoom-in;
  overflow: hidden;
}

.image-button img {
  width: 100%;
  max-height: 520px;
  object-fit: cover;
  object-position: center;
  transition: transform .25s ease, filter .25s ease;
}

.reference-figure-tall .image-button img { aspect-ratio: .78; }
.reference-figure-wide .image-button img { max-height: 600px; object-fit: contain; background: #fff; }

.image-button:hover img,
.image-button:focus-visible img { transform: scale(1.02); filter: brightness(1.07); }
.image-button:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }

figcaption {
  padding: 12px 3px 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

figcaption span { color: #78b4ff; font-weight: 700; text-transform: uppercase; }

.calibration {
  padding-top: 75px;
  background: linear-gradient(180deg, rgba(3, 14, 48, .72), rgba(2, 7, 26, .4));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid rgba(99, 146, 255, .18);
}

.calibration-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, .55fr);
  gap: 24px;
}

.calibration-grid-single { grid-template-columns: 1fr; }

.numbered-list { display: grid; gap: 1px; margin: 0; padding: 0; list-style: none; }

.numbered-list li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 17px;
  padding: 21px;
  background: rgba(4, 14, 45, .72);
  border: 1px solid rgba(99, 146, 255, .18);
}

.numbered-list li > span { color: #69a8ff; font-family: AntonLocal, Impact, sans-serif; font-size: 32px; }
.numbered-list strong { font-family: AntonLocal, Impact, sans-serif; font-size: 23px; font-weight: 400; text-transform: uppercase; }
.numbered-list p { margin: 7px 0 0; color: #ced3dd; font-size: 13px; line-height: 1.6; }

.settings-card {
  align-self: start;
  position: sticky;
  top: 20px;
  padding: 25px;
  border: 1px solid rgba(101, 171, 255, .65);
  background: linear-gradient(155deg, rgba(19, 68, 159, .8), rgba(2, 9, 34, .96));
  box-shadow: 0 0 25px rgba(31, 101, 226, .24);
}

.settings-card h3 { margin-bottom: 20px; font-size: 34px; line-height: 1; }
.settings-card dl { margin: 0 0 25px; }
.settings-card dl > div { display: flex; justify-content: space-between; gap: 15px; padding: 14px 0; border-top: 1px solid rgba(255, 255, 255, .16); }
.settings-card dl > div:last-child { border-bottom: 1px solid rgba(255, 255, 255, .16); }
.settings-card dt { color: #c9d4e8; font-size: 12px; line-height: 1.4; }
.settings-card dd { margin: 0; color: #fff; font-family: AntonLocal, Impact, sans-serif; font-size: 27px; white-space: nowrap; }
.settings-card > p:not(.eyebrow), .settings-card li { font-size: 12px; line-height: 1.55; }
.settings-card ul { padding-left: 20px; }

.final-checks { padding-top: 85px; }

.final-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 34px;
}

.final-grid article {
  min-height: 250px;
  padding: 25px;
  border-top: 3px solid var(--blue);
  background: rgba(4, 14, 43, .78);
}

.final-grid article > span { color: #69a8ff; font-family: AntonLocal, Impact, sans-serif; font-size: 27px; }
.final-grid h3 { margin: 30px 0 12px; font-size: 27px; line-height: 1; }
.final-grid p { margin: 0; color: #cfd4df; font-size: 12px; line-height: 1.65; }
.final-grid p a { color: #88bfff; text-underline-offset: 3px; }

.references { padding-top: 10px; }

.reference-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 13px;
}

.reference-thumb {
  display: grid;
  grid-template-rows: 170px auto;
  min-width: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: rgba(3, 12, 38, .88);
  text-align: left;
  cursor: zoom-in;
}

.reference-thumb img { width: 100%; height: 170px; object-fit: cover; }
.reference-thumb span { padding: 13px; color: #c8cedc; font-size: 11px; line-height: 1.45; }
.reference-thumb b { display: block; color: #71aeff; font-size: 13px; text-transform: uppercase; }
.reference-thumb:hover, .reference-thumb:focus-visible { border-color: #8fc4ff; outline: none; box-shadow: 0 0 18px rgba(66, 135, 255, .32); }

footer {
  display: grid;
  grid-template-columns: 1fr 230px auto;
  align-items: center;
  gap: 35px;
  padding: 35px;
  border-top: 1px solid var(--line);
  background: rgba(1, 6, 23, .82);
}

.footer-copy { display: flex; align-items: center; gap: 18px; }
.footer-logo { width: 72px; max-height: 86px; object-fit: contain; }
.footer-copy p { margin: 0; font-family: AntonLocal, Impact, sans-serif; font-size: 24px; line-height: 1; text-transform: uppercase; }
.signature { width: 210px; }
.back-to-top { justify-self: end; color: #9fcaff; font-size: 12px; text-underline-offset: 5px; }
.guide-legal-nav {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 18px;
}

.guide-legal-nav a {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  color: #9fcaff;
  font-family: AntonLocal, Impact, sans-serif;
  font-size: 13px;
  line-height: 1.05;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
  text-shadow: 0 0 10px rgba(87, 170, 255, .45);
}

.guide-legal-nav a span + span {
  margin-top: 3px;
  color: rgba(255,255,255,.82);
  font-size: 11px;
}

.guide-legal-nav a:hover,
.guide-legal-nav a:focus-visible {
  color: #fff;
  outline: none;
  text-shadow: 0 0 14px rgba(255,255,255,.85), 0 0 24px rgba(0,152,255,.7);
}

.footer-meta {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 30px;
  padding-top: 24px;
  border-top: 1px solid rgba(99, 146, 255, .24);
}

.footer-meta .version {
  margin: 0;
  color: #80b8ff;
  font-family: AntonLocal, Impact, sans-serif;
  font-size: 22px;
  line-height: 1;
  text-transform: uppercase;
}

.footer-meta div {
  display: grid;
  gap: 9px;
}

.footer-meta div p {
  margin: 0;
  color: #8f98aa;
  font-size: 9px;
  line-height: 1.55;
}

.footer-meta strong {
  color: #b8c6dc;
  font-weight: 400;
  text-transform: uppercase;
}

.lightbox {
  width: min(94vw, 1180px);
  max-width: none;
  max-height: 92vh;
  padding: 46px 18px 18px;
  border: 1px solid #70adff;
  background: #020617;
  box-shadow: 0 0 60px rgba(30, 97, 235, .5);
}

.lightbox::backdrop { background: rgba(0, 2, 12, .9); backdrop-filter: blur(5px); }
.lightbox img { width: 100%; max-height: calc(92vh - 70px); object-fit: contain; }
.lightbox-close { position: absolute; top: 4px; right: 10px; padding: 0; border: 0; background: transparent; color: #fff; font: 34px/1 Arial, sans-serif; cursor: pointer; }

@media (max-width: 820px) {
  .site-header { padding-inline: 22px; }
  .top-nav { gap: 8px; }
  .site-button { min-height: 60px; padding-inline: 10px; }
  .button-title { font-size: 20px; }
  .safety-banner { margin-inline: 22px; }
  .hero { min-height: 580px; padding: 70px 28px 60px; }
  .hero-copy { width: 66%; }
  .hero-art { top: 54px; right: 12px; width: 43%; height: 420px; }
  .hero-logo { opacity: .83; }
  .hero-stamp { width: 96px; }
  .intro-panel { gap: 28px; margin-inline: 22px; padding: 28px; }
  .tools-card, .psu-card { gap: 28px; }
  .psu-options { grid-template-columns: 1fr; }
  .callout { margin-inline: 22px; }
  .guide, .calibration, .final-checks, .references { padding-inline: 22px; }
  .step-card-media { grid-template-columns: 82px minmax(0, 1fr); }
  .step-card-media .reference-figure { grid-column: 2; width: 100%; }
  .calibration-grid { grid-template-columns: 1fr; }
  .settings-card { position: static; }
  .final-grid { grid-template-columns: 1fr; }
  .final-grid article { min-height: 0; }
  .reference-grid { grid-template-columns: repeat(2, 1fr); }
  footer { grid-template-columns: 1fr 180px; }
  .back-to-top { grid-column: 1 / -1; justify-self: center; }
  .footer-meta { grid-template-columns: 120px 1fr; gap: 22px; }
}

@media (max-width: 560px) {
  .site-header { display: block; padding: 14px 14px 0; }
  .top-nav { grid-template-columns: repeat(3, 1fr); }
  .site-button { min-height: 56px; padding: 8px 5px; }
  .button-kicker { font-size: 8px; }
  .button-title { font-size: 16px; }
  .safety-banner { gap: 12px; margin: 15px 14px 0; padding: 17px; }
  .safety-banner h2 { font-size: 24px; }
  .safety-banner p { font-size: 10px; line-height: 1.55; }
  .hero { min-height: 620px; padding: 54px 20px 45px; }
  .hero-copy { width: 100%; }
  h1 { font-size: 74px; }
  .hero-lead { font-size: 14px; line-height: 1.55; }
  .hero-art { top: 200px; right: -10%; width: 55%; height: 210px; opacity: .34; }
  .hero-logo { opacity: 1; }
  .hero-stamp { right: 8px; bottom: 0; width: 78px; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 17px; }
  .hero-actions .site-button { min-width: 0; width: 100%; }
  .text-link { text-align: center; }
  .intro-panel { grid-template-columns: 1fr; gap: 18px; margin-inline: 14px; padding: 21px; }
  .tools-card, .psu-card { grid-template-columns: 1fr; gap: 18px; padding: 20px; }
  .tools-card h3, .psu-card h3 { font-size: 32px; }
  .intro-panel h2, .section-heading h2, .final-checks > div > h2 { font-size: 48px; }
  .callout { gap: 13px; margin: 0 14px 60px; padding: 18px; }
  .callout-icon { flex-basis: 32px; width: 32px; height: 32px; font-size: 21px; }
  .callout h2 { font-size: 23px; }
  .callout p { font-size: 12px; }
  .guide, .calibration, .final-checks, .references { padding-inline: 14px; padding-bottom: 65px; }
  .section-heading { grid-template-columns: 1fr; gap: 15px; }
  .step-card, .step-card-media { grid-template-columns: 1fr; gap: 12px; padding: 21px; }
  .step-index { font-size: 48px; }
  .step-content h3 { font-size: 30px; }
  .step-content > p, .substeps { font-size: 13px; }
  .step-card-media .reference-figure, .step-card-media .reference-figure-wide { grid-column: 1; }
  .reference-figure-tall .image-button img { aspect-ratio: auto; max-height: none; object-fit: contain; }
  .numbered-list li { grid-template-columns: 43px 1fr; gap: 10px; padding: 17px; }
  .numbered-list li > span { font-size: 27px; }
  .numbered-list strong { font-size: 20px; }
  .reference-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .reference-thumb { grid-template-rows: 125px auto; }
  .reference-thumb img { height: 125px; }
  footer { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .signature { width: 180px; }
  .back-to-top { grid-column: auto; justify-self: center; }
  .footer-meta { grid-template-columns: 1fr; gap: 14px; }
  .footer-meta div { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}

@media print {
  :root { --ink: #111; --muted: #444; }
  html, body { background: #fff; color: #111; }
  .page { width: 100%; background: #fff; box-shadow: none; }
  .page::before, .top-nav, .hero-stamp, .hero-actions, .back-to-top, .references, .lightbox { display: none !important; }
  .site-header { display: block; padding: 12mm 12mm 0; }
  .hero { min-height: 0; padding: 12mm; }
  .hero-copy { width: 65%; }
  .hero-logo { opacity: .15; }
  h1 { color: #111; font-size: 54pt; }
  .hero-lead, .section-heading > p, .step-content > p, .substeps, .check-list, .numbered-list p, figcaption { color: #222; text-shadow: none; }
  .intro-panel, .tools-card, .psu-card, .step-card, .numbered-list li, .final-grid article { break-inside: avoid; background: #fff; border-color: #888; box-shadow: none; }
  .callout, .safety-banner { break-inside: avoid; background: #fff; color: #111; }
  .guide, .calibration, .final-checks { padding-inline: 12mm; }
  .calibration { background: #fff; }
  footer { background: #fff; color: #111; }
}