@font-face {
  font-family: "Barlow Condensed";
  src: url("barlow-condensed-800.ttf") format("truetype");
  font-style: normal;
  font-weight: 800;
  font-display: swap;
}

:root {
  --paper: #f2eee5;
  --paper-bright: #fbfaf6;
  --ink: #17343c;
  --ink-raised: #24464d;
  --ink-soft: #52676d;
  --rule: #c9d0ca;
  --audio: #d74e3f;
  --audio-dark: #a83b30;
  --video: #168c83;
  --video-dark: #0f6f68;
  --display-signal: #4456b8;
  --network: #536870;
  --cable: #f0c95d;
  --cable-ink: #3b320d;
  --white: #ffffff;
  --focus: #0d79a5;
  --display: "Barlow Condensed", "Arial Narrow", "Aptos Narrow", sans-serif;
  --body: Aptos, Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shadow: 0 24px 56px rgba(23, 52, 60, 0.14);
  --page: min(1180px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 17px/1.58 var(--body);
  text-rendering: optimizeLegibility;
}
body::selection, *::selection { color: var(--white); background: var(--video-dark); }
button, input { font: inherit; }
a { color: inherit; text-decoration-thickness: 1.5px; text-underline-offset: 0.23em; }
a:hover { text-decoration-thickness: 2.5px; }
img, svg { display: block; max-width: 100%; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--white);
  background: var(--focus);
  transform: translateY(-150%);
}
.skip-link:focus { transform: none; }

.site-header {
  position: relative;
  z-index: 20;
  min-height: 78px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border-bottom: 1px solid var(--rule);
  background: rgba(251, 250, 246, 0.96);
}
.brand {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
}
.brand-mark {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--ink);
}
.brand-mark svg { width: 18px; }
.brand-text { display: grid; line-height: 1.08; }
.brand-text small { color: var(--ink-soft); font-size: 11px; font-weight: 750; letter-spacing: 0.08em; text-transform: uppercase; }
.site-nav { display: flex; align-items: center; gap: 8px; }
.site-nav a {
  min-height: 44px;
  padding: 10px 13px;
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}
.site-nav a:hover { background: #e9e6de; }
.site-nav a[aria-current="page"] { color: var(--white); background: var(--ink); }
.menu-button {
  min-width: 44px;
  min-height: 44px;
  display: none;
  place-items: center;
  border: 1px solid var(--rule);
  border-radius: 8px;
  color: var(--ink);
  background: var(--paper-bright);
}
.menu-button svg { width: 24px; }

.button-row { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  min-height: 50px;
  padding: 12px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 2px solid var(--ink);
  border-radius: 9px;
  color: var(--white);
  background: var(--ink);
  font-weight: 850;
  text-decoration: none;
  transition: background-color 150ms ease, color 150ms ease, transform 150ms ease;
}
.button:hover { background: var(--ink-raised); transform: translateY(-1px); }
.button.secondary { color: var(--ink); background: transparent; }
.button.secondary:hover { color: var(--white); background: var(--ink); }
.button.small { min-height: 44px; padding: 9px 14px; font-size: 14px; }
.button svg { width: 18px; }

.hero {
  width: var(--page);
  min-height: 760px;
  margin: auto;
  padding: clamp(56px, 8vw, 110px) 0;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(440px, 0.96fr);
  gap: clamp(44px, 7vw, 96px);
  align-items: center;
}
.hero-copy h1, .page-intro h1, .closing h2 {
  margin: 0;
  font: 800 clamp(4rem, 7.8vw, 6rem) / 0.87 var(--display);
  letter-spacing: -0.03em;
  text-transform: uppercase;
  text-wrap: balance;
}
.hero-copy h1 span { color: var(--audio); }
.hero-copy > p {
  max-width: 610px;
  margin: 28px 0 32px;
  color: var(--ink-soft);
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.38;
}
.hero-note { margin: 26px 0 0; display: flex; align-items: center; gap: 10px; color: var(--ink-soft); font-size: 14px; font-weight: 750; }
.hero-note::before { width: 36px; height: 4px; content: ""; background: var(--audio); }

.signal-board {
  position: relative;
  min-height: 620px;
  padding: clamp(32px, 4vw, 54px);
  border-radius: 16px;
  color: var(--white);
  background: var(--ink);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.signal-board::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 100% 36px;
  pointer-events: none;
}
.signal-board h2 { position: relative; max-width: 440px; margin: 0 0 38px; font: 800 clamp(2.55rem, 4.2vw, 4.5rem) / 0.91 var(--display); letter-spacing: -0.02em; text-transform: uppercase; }
.signal-board h2 span { color: var(--cable); }
.chain { position: relative; display: grid; gap: 18px; }
.chain-row { min-height: 82px; display: grid; grid-template-columns: 112px 1fr; gap: 16px; align-items: center; }
.chain-row + .chain-row::before {
  position: absolute;
  left: 55px;
  width: 4px;
  height: 26px;
  margin-top: -108px;
  content: "";
  background: var(--audio);
}
.chain-icon {
  min-height: 72px;
  display: grid;
  place-items: center;
  border: 1px solid #55727a;
  border-radius: 12px;
  background: var(--ink-raised);
}
.chain-icon svg { width: 38px; color: var(--cable); }
.chain-row strong { display: block; color: var(--white); font-size: 18px; }
.chain-row span { display: block; color: #bad0d4; font-size: 14px; }
.audio-lock {
  position: relative;
  margin-top: 30px;
  padding: 16px 0 0;
  border-top: 1px solid #49636a;
  display: flex;
  align-items: center;
  gap: 12px;
  color: #f4b4ac;
  font-weight: 850;
}
.audio-lock svg { width: 22px; }

.section { padding: clamp(78px, 10vw, 140px) 0; }
.section-inner { width: var(--page); margin: auto; }
.section-heading { max-width: 850px; margin-bottom: clamp(42px, 6vw, 74px); }
.section-heading h2, .manual-content h2, .guide-section h2 {
  margin: 0 0 16px;
  font: 800 clamp(2.8rem, 5.7vw, 5.4rem) / 0.9 var(--display);
  letter-spacing: -0.025em;
  text-transform: uppercase;
  text-wrap: balance;
}
.section-heading p { max-width: 690px; margin: 0; color: var(--ink-soft); font-size: 19px; }

.audio-principle { color: var(--white); background: var(--audio-dark); }
.audio-principle .section-inner { display: grid; grid-template-columns: 1.14fr 0.86fr; gap: clamp(44px, 8vw, 110px); align-items: center; }
.audio-principle h2 { max-width: 760px; margin: 0; font: 800 clamp(3.8rem, 7.3vw, 6rem) / 0.86 var(--display); letter-spacing: -0.03em; text-transform: uppercase; text-wrap: balance; }
.audio-principle h2 span { color: var(--cable); }
.principle-copy { max-width: 510px; }
.principle-copy p { margin: 0 0 20px; color: #ffe9e5; font-size: 20px; }
.principle-copy strong { color: var(--white); }
.mic-rule { margin-top: 30px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.38); font-size: 16px !important; font-weight: 850; }

.build-levels { border-top: 1px solid var(--rule); }
.build-level {
  min-height: 215px;
  display: grid;
  grid-template-columns: 165px minmax(250px, .7fr) minmax(0, 1.3fr);
  gap: clamp(24px, 4vw, 60px);
  align-items: center;
  border-bottom: 1px solid var(--rule);
}
.level-number { color: var(--video-dark); font: 800 4.3rem/1 var(--display); font-variant-numeric: tabular-nums; }
.build-level h3 { margin: 0 0 8px; font: 800 2rem/1 var(--display); text-transform: uppercase; }
.build-level p { margin: 0; color: var(--ink-soft); }
.equipment-line { display: flex; flex-wrap: wrap; gap: 10px; }
.equipment-line span { padding: 8px 11px; border: 1px solid var(--rule); border-radius: 7px; color: var(--ink); background: var(--paper-bright); font-size: 14px; font-weight: 800; }

.map-section { color: var(--white); background: var(--ink); }
.map-section .section-heading p { color: #c7d6d8; }
.map-frame { margin: 0; padding: 14px; border-radius: 18px; background: var(--paper-bright); box-shadow: 0 28px 70px rgba(0,0,0,.27); }
.map-frame img { width: 100%; border-radius: 11px; }
.map-frame figcaption { padding: 16px 10px 4px; color: var(--ink-soft); font-size: 14px; }
.map-legend { margin: 24px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 12px 28px; list-style: none; }
.map-legend li { display: flex; align-items: center; gap: 9px; color: #d7e2e4; font-size: 14px; }
.map-legend i { width: 32px; height: 4px; display: inline-block; background: currentColor; }
.map-legend .audio-key { color: #ff8e80; }
.map-legend .video-key { color: #5ed4ca; }
.map-legend .display-key { color: #9da9ff; }
.map-legend .network-key { color: #c5d1d4; }

.rules-list { border-top: 1px solid var(--rule); }
.rule-row { padding: 28px 0; display: grid; grid-template-columns: 80px 300px 1fr; gap: clamp(20px, 4vw, 54px); border-bottom: 1px solid var(--rule); align-items: baseline; }
.rule-row > span { color: var(--video-dark); font: 800 2.3rem/1 var(--display); }
.rule-row h3 { margin: 0; font: 800 1.75rem/1 var(--display); text-transform: uppercase; }
.rule-row p { max-width: 660px; margin: 0; color: var(--ink-soft); }

.closing { padding: clamp(90px, 12vw, 170px) 0; text-align: center; background: var(--cable); }
.closing .section-inner { display: grid; justify-items: center; }
.closing h2 { max-width: 900px; color: var(--cable-ink); }
.closing p { max-width: 680px; margin: 24px 0 30px; color: #574a16; font-size: 20px; }

.site-footer { color: #cedadc; background: var(--ink); }
.footer-inner { width: var(--page); min-height: 150px; margin: auto; padding: 34px 0; display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: end; }
.site-footer p { max-width: 660px; margin: 0; font-size: 14px; }
.site-footer a { color: var(--white); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 18px; font-size: 14px; font-weight: 750; }

.page-intro { width: var(--page); margin: auto; padding: clamp(70px, 10vw, 140px) 0 clamp(58px, 8vw, 110px); }
.page-intro h1 { max-width: 970px; }
.page-intro > p { max-width: 720px; margin: 26px 0 0; color: var(--ink-soft); font-size: clamp(20px, 2.3vw, 26px); line-height: 1.42; }
.page-intro .route { margin-top: 32px; padding: 16px 0; display: flex; flex-wrap: wrap; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); color: var(--video-dark); font-weight: 850; }
.route span { display: flex; align-items: center; }
.route span:not(:last-child)::after { margin: 0 13px; content: "→"; color: var(--audio); }

.guide-section { padding: clamp(72px, 9vw, 120px) 0; border-top: 1px solid var(--rule); }
.guide-section:nth-of-type(even) { background: var(--paper-bright); }
.guide-section-inner { width: min(980px, calc(100% - 48px)); margin: auto; }
.guide-section h2 { max-width: 840px; }
.guide-section > .guide-section-inner > p { max-width: 720px; color: var(--ink-soft); }
.guide-section h3, .manual-content h3 { margin: 46px 0 12px; font: 800 2rem/1 var(--display); text-transform: uppercase; }
.guide-section h4, .manual-content h4 { margin: 32px 0 8px; font-size: 18px; }

.step-list { margin: 46px 0 0; border-top: 1px solid var(--rule); }
.step { padding: 30px 0; display: grid; grid-template-columns: 70px 1fr; gap: 24px; border-bottom: 1px solid var(--rule); }
.step-number { width: 52px; height: 52px; display: grid; place-items: center; border-radius: 50%; color: var(--white); background: var(--ink); font: 800 1.8rem/1 var(--display); }
.step h3 { margin: 2px 0 8px; }
.step p { max-width: 700px; margin: 0; color: var(--ink-soft); }

.checklist {
  --checklist-scale: 0;
  margin-top: 40px;
  border-radius: 15px;
  background: var(--white);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.checklist-header { padding: 24px clamp(20px, 4vw, 38px); display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--white); background: var(--ink); }
.checklist-header h3 { margin: 0; color: var(--white); }
.checklist-meter { color: #c7d6d8; font-size: 14px; font-weight: 800; font-variant-numeric: tabular-nums; }
.checklist-progress { height: 6px; background: #dfe4df; }
.checklist-progress span { width: 100%; height: 100%; display: block; background: var(--video); transform: scaleX(var(--checklist-scale)); transform-origin: left; transition: transform 260ms cubic-bezier(.16,1,.3,1); }
.checklist-items { padding: 12px clamp(20px, 4vw, 38px); }
.check-item { min-height: 58px; display: grid; grid-template-columns: 28px 1fr; gap: 13px; align-items: center; border-bottom: 1px solid #e2e5e1; cursor: pointer; }
.check-item:last-child { border-bottom: 0; }
.check-item input { width: 22px; height: 22px; margin: 0; accent-color: var(--video-dark); }
.check-item span { color: var(--ink); }
.check-item input:checked + span { color: var(--ink-soft); text-decoration: line-through; text-decoration-thickness: 1.5px; }
.checklist-actions { padding: 16px clamp(20px, 4vw, 38px) 24px; }
.text-button { min-height: 44px; padding: 7px 0; border: 0; color: var(--video-dark); background: transparent; font-weight: 850; text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }

.audio-loop {
  margin: 42px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  align-items: stretch;
}
.loop-node { position: relative; min-height: 160px; padding: 24px 20px; display: grid; align-content: center; color: var(--white); background: var(--ink); }
.loop-node:first-child { border-radius: 14px 0 0 14px; }
.loop-node:last-child { border-radius: 0 14px 14px 0; }
.loop-node + .loop-node { border-left: 1px solid #4d6970; }
.loop-node:not(:last-child)::after { position: absolute; z-index: 2; right: -14px; top: calc(50% - 14px); width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; content: "→"; color: var(--white); background: var(--audio); font-weight: 900; }
.loop-node strong { font-size: 18px; }
.loop-node span { color: #bad0d4; font-size: 14px; }

.callout { margin: 32px 0; padding: 22px 24px; border-radius: 12px; background: #fffdf7; box-shadow: inset 0 3px 0 var(--cable); }
.callout strong { display: block; margin-bottom: 5px; color: var(--ink); }
.callout p { margin: 0; color: var(--ink-soft); }
.callout.danger { background: #fff4f1; box-shadow: inset 0 3px 0 var(--audio); }
.script-box { margin: 34px 0; padding: clamp(24px, 4vw, 40px); border-radius: 14px; color: var(--white); background: var(--ink); }
.script-box blockquote { max-width: 760px; margin: 0 0 22px; color: var(--white); font-size: clamp(20px, 2.3vw, 26px); line-height: 1.45; }
.script-box .button { border-color: var(--cable); color: var(--cable-ink); background: var(--cable); }

.manual-shell { width: var(--page); margin: auto; padding: 70px 0 130px; display: grid; grid-template-columns: 250px minmax(0, 820px); gap: clamp(50px, 8vw, 120px); justify-content: center; }
.manual-rail { position: sticky; top: 28px; align-self: start; }
.manual-rail p { margin: 0 0 13px; color: var(--video-dark); font-size: 12px; font-weight: 850; letter-spacing: 0.1em; text-transform: uppercase; }
.manual-rail nav { display: grid; }
.manual-rail a { padding: 9px 0; border-bottom: 1px solid var(--rule); color: var(--ink-soft); font-size: 14px; font-weight: 750; text-decoration: none; }
.manual-rail a:hover { color: var(--ink); }
.manual-content { min-width: 0; }
.manual-content > h1 { max-width: 760px; margin: 0 0 22px; font: 800 clamp(3.8rem, 7vw, 5.9rem) / 0.87 var(--display); letter-spacing: -0.03em; text-transform: uppercase; text-wrap: balance; }
.manual-lede { max-width: 720px; margin: 0 0 70px; color: var(--ink-soft); font-size: 21px; }
.manual-content section { padding: 72px 0 0; scroll-margin-top: 24px; }
.manual-content section + section { margin-top: 72px; border-top: 1px solid var(--rule); }
.manual-content h2 { font-size: clamp(2.7rem, 5vw, 4.8rem); }
.manual-content p, .manual-content li { color: #304c53; }
.manual-content ul, .manual-content ol { padding-left: 23px; }
.manual-content li { margin-bottom: 10px; }
.manual-content .map-frame { margin-top: 36px; }

.architecture-list { margin: 36px 0; border-top: 1px solid var(--rule); }
.architecture { padding: 28px 0; display: grid; grid-template-columns: 155px 1fr; gap: 30px; border-bottom: 1px solid var(--rule); }
.architecture strong { font: 800 1.55rem/1 var(--display); text-transform: uppercase; }
.architecture p { margin: 0; }

.run-table, .equipment-table { width: 100%; margin: 34px 0; border-collapse: collapse; background: var(--paper-bright); }
.run-table th, .run-table td, .equipment-table th, .equipment-table td { padding: 15px 16px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.run-table th, .equipment-table th { color: var(--video-dark); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; }
.run-table td:first-child { width: 150px; color: var(--ink); font-weight: 850; }
.equipment-table td:first-child { width: 36%; color: var(--ink); font-weight: 800; }
.equipment-table a { color: var(--display-signal); }
.table-scroll { margin: 34px 0; }
.table-scroll .run-table, .table-scroll .equipment-table { margin: 0; }
.table-scroll:focus-visible { outline: 3px solid var(--display-signal); outline-offset: 4px; }
.table-scroll-cue { display: none; }

.troubleshooting { margin: 34px 0; border-top: 1px solid var(--rule); }
.troubleshooting details { border-bottom: 1px solid var(--rule); }
.troubleshooting summary { min-height: 62px; padding: 16px 44px 16px 0; display: flex; align-items: center; color: var(--ink); font-weight: 850; cursor: pointer; list-style: none; }
.troubleshooting summary::-webkit-details-marker { display: none; }
.troubleshooting summary::after { margin-left: auto; content: "+"; color: var(--video-dark); font: 800 1.6rem/1 var(--display); }
.troubleshooting details[open] summary::after { content: "–"; }
.troubleshooting details > div { max-width: 700px; padding: 0 0 24px; }
.troubleshooting details p { margin: 0; }

.diagram-transcript { margin: 28px 0 0; padding: 22px 24px; border-radius: 12px; background: #e8e5dd; }
.diagram-transcript summary { color: var(--ink); font-weight: 850; cursor: pointer; }
.diagram-transcript ul { margin-bottom: 0; }
.source-note { font-size: 14px; }

@media (max-width: 940px) {
  :root { --page: min(100% - 40px, 760px); }
  .hero { min-height: auto; grid-template-columns: 1fr; }
  .signal-board { min-height: 570px; }
  .audio-principle .section-inner { grid-template-columns: 1fr; }
  .build-level { grid-template-columns: 90px 1fr; padding: 30px 0; }
  .build-level .equipment-line { grid-column: 2; }
  .rule-row { grid-template-columns: 60px 240px 1fr; }
  .manual-shell { grid-template-columns: 1fr; }
  .manual-rail { position: static; }
  .manual-rail nav { grid-template-columns: repeat(3, 1fr); gap: 0 20px; }
  .manual-rail a { min-height: 44px; }
}

@media (max-width: 680px) {
  :root { --page: min(100% - 32px, 620px); }
  body { font-size: 16px; }
  .site-header { min-height: 68px; padding: 0 16px; }
  .brand-text span { font-size: 14px; }
  .brand-text small { font-size: 9px; }
  .menu-button { display: grid; }
  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    padding: 12px 16px 18px;
    display: none;
    align-items: stretch;
    border-bottom: 1px solid var(--rule);
    background: var(--paper-bright);
    box-shadow: 0 16px 30px rgba(23,52,60,.12);
  }
  .site-nav[data-open="true"] { display: grid; }
  .site-nav a { justify-content: center; }
  .hero { padding: 48px 0 62px; }
  .hero-copy h1, .page-intro h1, .closing h2 { font-size: clamp(3.45rem, 17vw, 4.8rem); }
  .hero-copy > p { margin-top: 21px; font-size: 18px; }
  .button-row { display: grid; }
  .button { width: 100%; }
  .signal-board { min-height: auto; padding: 30px 24px; }
  .signal-board h2 { font-size: 3rem; }
  .chain-row { grid-template-columns: 74px 1fr; }
  .chain-row + .chain-row::before { left: 36px; }
  .section { padding: 80px 0; }
  .audio-principle h2 { font-size: clamp(3.4rem, 16vw, 4.8rem); }
  .principle-copy p { font-size: 18px; }
  .build-level { grid-template-columns: 56px 1fr; gap: 18px; }
  .level-number { font-size: 3rem; }
  .build-level .equipment-line { grid-column: 1 / -1; }
  .map-frame { width: calc(100vw - 16px); margin-left: calc((100% - (100vw - 16px)) / 2); padding: 8px; overflow-x: auto; }
  .map-frame img { width: 980px; max-width: none; }
  .map-frame figcaption { width: min(980px, calc(100vw - 48px)); }
  .rule-row { grid-template-columns: 50px 1fr; gap: 13px; }
  .rule-row p { grid-column: 2; }
  .footer-inner { grid-template-columns: 1fr; align-items: start; }
  .page-intro { padding: 55px 0 70px; }
  .page-intro .route { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 12px; }
  .route span:not(:last-child)::after { display: none; }
  .route span::before { margin-right: 7px; content: "→"; color: var(--audio); }
  .guide-section-inner { width: min(100% - 32px, 620px); }
  .step { grid-template-columns: 48px 1fr; gap: 15px; }
  .step-number { width: 44px; height: 44px; }
  .audio-loop { grid-template-columns: 1fr; }
  .loop-node:first-child { border-radius: 14px 14px 0 0; }
  .loop-node:last-child { border-radius: 0 0 14px 14px; }
  .loop-node + .loop-node { border-left: 0; border-top: 1px solid #4d6970; }
  .loop-node:not(:last-child)::after { right: auto; left: calc(50% - 14px); top: auto; bottom: -14px; content: "↓"; }
  .manual-shell { width: min(100% - 32px, 620px); padding-top: 50px; }
  .manual-rail nav { grid-template-columns: 1fr 1fr; }
  .manual-content > h1 { font-size: clamp(3.4rem, 17vw, 4.7rem); }
  .architecture { grid-template-columns: 1fr; gap: 10px; }
  .table-scroll { margin-top: 12px; overflow-x: auto; overscroll-behavior-inline: contain; }
  .table-scroll-cue { margin: 24px 0 0; display: flex; justify-content: space-between; color: var(--video-dark); font-size: 13px; font-weight: 850; }
  .run-table { min-width: 660px; }
  .equipment-table { min-width: 520px; }
  .run-table th, .run-table td, .equipment-table th, .equipment-table td { min-width: 165px; }
}

@media print {
  @page { margin: 0.6in; }
  body { color: #000; background: #fff; font-size: 11pt; }
  .site-header, .site-footer, .button-row, .menu-button, .checklist-actions, .manual-rail { display: none !important; }
  .hero, .section-inner, .guide-section-inner, .manual-shell, .page-intro { width: 100%; }
  .hero { min-height: auto; padding-top: 0; grid-template-columns: 1fr; }
  .signal-board, .audio-principle, .map-section, .script-box { color: #000; background: #fff; box-shadow: none; border: 1px solid #777; }
  .signal-board *, .audio-principle *, .map-section *, .script-box * { color: #000 !important; }
  .section, .guide-section, .manual-content section { padding-top: 36px; break-inside: auto; }
  .checklist { box-shadow: none; border: 1px solid #777; }
  .checklist-header { color: #000; background: #fff; }
  .check-item { break-inside: avoid; }
  .map-frame { box-shadow: none; }
  a { text-decoration: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}