/* Turbo Oxygen — an editorial, accessible digital manual */
:root {
  --teal: #174b52;
  --teal-dark: #123a40;
  --cyan: #45bfcb;
  --orange: #ef542b;
  --ink: #20383b;
  --muted: #647477;
  --paper: #f7f8f6;
  --line: #e1e7e4;
  --white: #fff;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 112px;
}
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "DM Sans", sans-serif;
  font-size: 19.2px;
  line-height: 1.75;
}
a {
  color: var(--teal);
  text-decoration: none;
}
a:hover {
  color: var(--orange);
}
button,
input {
  font: inherit;
}
button {
  cursor: pointer;
}
button,
a,
input,
summary {
  -webkit-tap-highlight-color: transparent;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 5px;
}
button {
  color: inherit;
}
h1,
h2,
h3 {
  font-family: Manrope, sans-serif;
  line-height: 1.2;
  letter-spacing: -0.035em;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
p {
  margin-bottom: 20px;
}
h3 {
  font-size: 20px;
  font-weight: 750;
  margin-top: 34px;
  margin-bottom: 16px;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
ul {
  padding-left: 24px;
  margin: 14px 0 26px;
}
li {
  padding-left: 6px;
  margin-bottom: 10px;
}
li::marker {
  color: var(--teal);
}
.skip {
  position: fixed;
  top: -70px;
  left: 20px;
  z-index: 100;
  background: #fff;
  padding: 10px 20px;
}
.skip:focus {
  top: 10px;
}
.reading-progress {
  position: fixed;
  top: 0;
  height: 3px;
  width: 100%;
  z-index: 50;
  pointer-events: none;
}
#progress-bar {
  height: 100%;
  width: 0;
  background: var(--orange);
}
.header {
  height: 96px;
  padding: 0 clamp(24px, 4.2vw, 72px);
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 25px;
  position: sticky;
  top: 0;
  z-index: 30;
}
.brand img {
  width: 204px;
}
.header-divider {
  width: 1px;
  height: 27px;
  background: var(--line);
}
.header-label {
  font-size: 12px;
  letter-spacing: 0.17em;
  font-weight: 700;
  color: var(--muted);
}
.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 25px;
  font-size: 14.4px;
  font-weight: 600;
}
.website-link span {
  margin-left: 8px;
}
.search-button {
  border: 0;
  background: transparent;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 0;
}
.search-button > span {
  font-size: 25px;
  line-height: 1;
}
.search-button kbd {
  margin-left: 13px;
}
kbd {
  font-family: inherit;
  border: 1px solid var(--line);
  padding: 0 7px;
  font-size: 13.2px;
  border-radius: 4px;
  color: var(--muted);
}
.download-button {
  background: var(--teal);
  color: #fff;
  border-radius: 6px;
  padding: 12px 20px;
  display: flex;
  gap: 12px;
  align-items: center;
}
.download-button:hover {
  background: var(--teal-dark);
  color: #fff;
}
.download-button > span {
  font-size: 19px;
}
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  min-height: 605px;
  padding: 60px clamp(24px, 4.2vw, 72px) 48px;
  gap: 5%;
  max-width: 1600px;
  margin: auto;
}
.hero-copy {
  align-self: center;
  padding: 18px 0;
}
.hero-eyebrow {
  font-size: 12px;
  letter-spacing: 0.15em;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 29px;
}
.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  flex-shrink: 0;
}
.version {
  margin-left: 10px;
  padding-left: 18px;
  border-left: 1px solid #cdd9d7;
  color: var(--muted);
  font-size: 10.8px;
}
.hero h1 {
  font-size: clamp(40px, 4.3vw, 68px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.052em;
  margin-bottom: 26px;
  white-space: nowrap;
}
.hero h1 > span {
  color: var(--teal);
}
.hero-description {
  font-size: 20.4px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 31px;
}
.hero-cta {
  display: flex;
  align-items: center;
  gap: 30px;
}
.primary-button {
  display: flex;
  align-items: center;
  gap: 31px;
  background: var(--orange);
  border: 1px solid var(--orange);
  color: #fff;
  padding: 14px 21px;
  border-radius: 5px;
  font-size: 15.6px;
  font-weight: 600;
  transition:
    background 0.2s,
    transform 0.2s;
}
.primary-button:hover {
  background: #d94821;
  color: #fff;
  transform: translateY(-2px);
}
.text-link {
  font-size: 14.4px;
  font-weight: 600;
}
.text-link span {
  margin-left: 9px;
}
.hero-note {
  font-size: 13.2px;
  margin-top: 36px;
  color: var(--muted);
  display: flex;
  gap: 9px;
  align-items: center;
}
.hero-note > span {
  border: 1px solid #8c9e9d;
  width: 15px;
  height: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 9px;
}
.hero-visual {
  position: relative;
  align-self: stretch;
  min-width: 0;
  overflow: hidden;
  border-radius: 10px;
  background: #e1e3df;
}
.hero-visual > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 48%;
}
.visual-label {
  position: absolute;
  left: 24px;
  top: 24px;
  font-size: 9.6px;
  font-weight: 700;
  letter-spacing: 0.12em;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  background: rgba(255, 255, 255, 0.91);
  border-radius: 4px;
}
.visual-label .status-dot {
  width: 5px;
  height: 5px;
  background: var(--teal);
}
.session-pill {
  position: absolute;
  right: 20px;
  bottom: 20px;
  display: flex;
  gap: 14px;
  align-items: center;
  border: 1px solid #fff;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.94);
  border-radius: 7px;
  backdrop-filter: blur(10px);
}
.session-pill strong {
  font-family: Manrope, sans-serif;
  font-size: 20px;
  letter-spacing: -0.05em;
  display: block;
  line-height: 1.3;
}
.session-pill span:not(.pill-icon) {
  display: block;
  font-size: 10.8px;
  color: var(--muted);
  margin-top: 3px;
}
.pill-icon {
  font-size: 31px;
  color: var(--teal);
  line-height: 1;
}
.facts {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 29px clamp(24px, 4.2vw, 72px);
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr 1fr;
  max-width: 1600px;
  margin: auto;
  gap: 20px;
}
.eyebrow {
  font-size: 10.8px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--teal);
  display: block;
}
.fact-intro p {
  font-family: Manrope, sans-serif;
  font-weight: 650;
  font-size: 19.2px;
  margin: 8px 0 0;
  line-height: 1.4;
}
.fact {
  border-left: 1px solid var(--line);
  padding-left: 40px;
  align-self: center;
}
.fact > strong {
  font-family: Manrope, sans-serif;
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--teal);
}
.fact > strong span {
  font-size: 15.6px;
  letter-spacing: 0;
  margin-left: 6px;
  color: var(--muted);
  font-weight: 500;
}
.fact p {
  font-size: 12px;
  color: var(--muted);
  margin: 9px 0 0;
}
.manual-shell {
  max-width: 1480px;
  margin: auto;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 85px;
  padding: 62px clamp(24px, 4.2vw, 72px) 80px;
}
.sidebar {
  align-self: start;
  position: sticky;
  top: 124px;
}
.sidebar-inner {
  display: block;
}
.toc-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10.8px;
  letter-spacing: 0.14em;
  font-weight: 700;
  margin-bottom: 20px;
}
.toc-label > span {
  font-size: 8.4px;
  letter-spacing: 0.04em;
  color: #748784;
}
.toc {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.toc > a {
  padding: 9px 12px;
  display: flex;
  align-items: center;
  gap: 13px;
  font-size: 13.2px;
  border-left: 2px solid transparent;
  color: #637676;
  border-radius: 0 4px 4px 0;
  transition:
    background 0.2s,
    color 0.2s;
}
.toc > a > span {
  font-size: 10.8px;
  color: #94a4a1;
  font-variant-numeric: tabular-nums;
}
.toc > a.active {
  background: #e7f0ed;
  border-left-color: var(--teal);
  color: var(--teal);
  font-weight: 700;
}
.toc > a.active > span {
  color: var(--teal);
}
.toc > a:hover {
  background: #eef2ef;
  color: var(--teal);
}
.sidebar-help {
  border: 1px solid var(--line);
  padding: 20px;
  margin-top: 30px;
  border-radius: 6px;
  background: #fff;
}
.help-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 1px solid var(--teal);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 14px;
}
.sidebar-help h3 {
  font-size: 16px;
  margin: 0 0 5px;
}
.sidebar-help p {
  font-size: 13.2px;
  color: var(--muted);
  margin: 0 0 14px;
}
.sidebar-help a {
  font-size: 13.2px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
}
.print-button {
  display: flex;
  justify-content: space-between;
  width: 100%;
  border: 0;
  background: transparent;
  padding: 18px 0;
  font-size: 12px;
  color: var(--muted);
}
.mobile-contents {
  display: none;
}
.manual-content {
  min-width: 0;
  max-width: 850px;
}
.welcome {
  padding: 0 0 60px;
}
.welcome .eyebrow {
  margin-bottom: 18px;
}
.welcome h2 {
  font-size: 33px;
  margin-bottom: 26px;
}
.welcome > p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.85;
}
.welcome strong {
  color: var(--ink);
}
.safety-strip {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  padding: 18px;
  background: #fff0e9;
  border-radius: 5px;
  border: 1px solid #f5d8c9;
  margin-top: 30px;
  flex-wrap: wrap;
}
.safety-strip > span {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #ce572c;
  color: #ce572c;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 11px;
  margin-top: 3px;
  flex-shrink: 0;
}
.safety-strip p {
  font-size: 14.4px;
  margin: 0;
  flex: 1;
  color: #805344;
}
.safety-strip a {
  font-size: 12px;
  font-weight: 700;
  align-self: center;
  color: #ae4520;
  white-space: nowrap;
}
.chapter {
  padding: 50px 0 60px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 0;
}
.chapter-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 30px;
}
.chapter-heading .eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
  color: #65817e;
  font-size: 9.6px;
}
.chapter-heading .eyebrow i {
  width: 20px;
  height: 1px;
  background: #b9c9c5;
  display: block;
}
.chapter-heading h2 {
  font-size: 32px;
  letter-spacing: -0.045em;
  margin: 15px 0;
}
.chapter-subtitle {
  color: var(--muted);
  font-size: 16.8px;
  line-height: 1.8;
  margin: 0;
  max-width: 650px;
}
.copy-link {
  border: 1px solid var(--line);
  border-radius: 50%;
  background: none;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  font-size: 18px;
  margin-top: 33px;
  color: #66817c;
}
.copy-link:hover {
  background: #fff;
  border-color: var(--teal);
}
.chapter > p,
.chapter > ul {
  font-size: 16.8px;
  color: #52676a;
}
.chapter > h3 {
  font-size: 20px;
  margin-top: 36px;
}
.notice {
  display: flex;
  gap: 15px;
  padding: 22px;
  background: #eaf2ef;
  border: 1px solid #d6e5df;
  border-radius: 6px;
  margin: 25px 0;
}
.notice-icon {
  border: 1px solid #4c7f75;
  border-radius: 50%;
  font-size: 11px;
  line-height: 18px;
  display: block;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  text-align: center;
  font-weight: 600;
  margin-top: 3px;
}
.notice strong {
  font-size: 15.6px;
  color: var(--teal);
}
.notice p {
  font-size: 15.6px;
  margin: 7px 0 0;
  line-height: 1.85;
  color: #526e68;
}
.notice.warning {
  background: #fff2ea;
  border-color: #f2d8c8;
}
.notice.warning .notice-icon {
  color: #ba582e;
  border-color: #ba582e;
}
.notice.warning strong {
  color: #9d4d2c;
}
.notice.warning p {
  color: #865c48;
}
.component-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.component {
  padding: 25px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.component:nth-child(odd) {
  border-right: 1px solid var(--line);
}
.component:nth-last-child(-n + 2) {
  border-bottom: 0;
}
.component > span {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}
.component h3 {
  font-size: 17px;
  margin: 12px 0;
}
.component p {
  font-size: 14.4px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}
details {
  border-bottom: 1px solid var(--line);
  background: transparent;
}
summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 20px 0;
  font-size: 16.8px;
  font-weight: 500;
  color: var(--ink);
}
summary::-webkit-details-marker {
  display: none;
}
.detail-plus {
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.2s;
  color: var(--teal);
}
details[open] > summary .detail-plus {
  transform: rotate(45deg);
}
.detail-body {
  font-size: 15.6px;
  color: var(--muted);
  padding: 0 0 25px;
}
.detail-body p {
  margin-bottom: 12px;
}
.inventory-head {
  display: flex;
  justify-content: space-between;
  font-size: 9.6px;
  letter-spacing: 0.12em;
  color: #7f948e;
  padding-bottom: 10px;
}
.inventory-row {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding: 15px 0;
  font-size: 14.4px;
}
.inventory-row strong {
  font-weight: 500;
  color: var(--ink);
}
.inventory-row p {
  font-size: 13.2px;
  margin: 5px 0 0;
  line-height: 1.75;
}
.quantity {
  flex-shrink: 0;
  min-width: 40px;
  text-align: right;
  color: var(--teal);
}
.step-title {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 38px !important;
  font-size: 18px !important;
}
.step-title > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 35px;
  height: 35px;
  flex-shrink: 0;
  border: 1px solid #cadbd4;
  background: #ebf2ee;
  border-radius: 5px;
  letter-spacing: 0;
  font-size: 13.2px;
  color: var(--teal);
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 1.5rem;
  counter-reset: step;
}

.steps li {
  position: relative;
  font-size: 0.95rem;          /* smaller than body headings */
  font-weight: 400;            /* NOT bold */
  line-height: 1.55;
  margin: 0 0 0.65rem;
  padding-left: 2.25rem;       /* space for the number */
  color: inherit;
}

.steps li > span {
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 600;            /* number stays slightly bolder */
  font-size: 0.85rem;          /* number slightly smaller than text */
  color: #174b52;              /* brand teal, matches your theme */
  letter-spacing: 0.02em;
}

/* Dark mode tweak — lighter teal so it stays readable */
[data-theme="dark"] .steps li > span {
  color: #7fd1d9;
}

.wide-photo {
  margin: 0 0 30px;
}
.wide-photo img {
  width: 100%;
  aspect-ratio: 2.12;
  object-fit: cover;
  border-radius: 7px;
}
.wide-photo figcaption,
figure figcaption {
  font-size: 10.8px;
  color: #82908d;
  margin-top: 9px;
}
.wide-photo figcaption a {
  color: #6c8480;
}
.session-check {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 24px;
  background: #fff;
}
.check-title {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 20px;
  font-size: 10.8px;
  letter-spacing: 0.12em;
  font-weight: 600;
}
.check-title button {
  border: 0;
  background: none;
  font-size: 10.8px;
  color: var(--muted);
  padding: 0;
  letter-spacing: 0;
}
.session-check label {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  padding: 11px 0;
  border-top: 1px solid #eef1ee;
  font-size: 15.6px;
  cursor: pointer;
}
.session-check input {
  margin: 6px 0 0;
  accent-color: var(--teal);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.session-check input:checked + span {
  color: #879d95;
}
.session-check > p {
  font-size: 12px;
  color: var(--teal);
  margin: 14px 0 0;
}
.mask-note {
  display: flex;
  gap: 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  overflow: hidden;
  margin-top: 35px;
}
.mask-note > img {
  width: 36%;
  object-fit: cover;
}
.mask-note > div {
  padding: 28px 25px 28px 0;
  align-self: center;
}
.mask-note h3 {
  margin: 12px 0;
  font-size: 22px;
}
.mask-note p {
  font-size: 14.4px;
  color: var(--muted);
  margin-bottom: 15px;
}
.media-credit {
  font-size: 10.8px;
  color: #8b9c96;
}
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}
.filter-tabs button {
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 5px;
  font-size: 12px;
  color: var(--muted);
}
.filter-tabs button.selected {
  color: #fff;
  background: var(--teal);
  border-color: var(--teal);
}
.trouble-group > h3 {
  font-size: 17px;
  margin: 28px 0 7px;
}
.trouble-item summary {
  font-size: 15.6px;
  padding: 17px 0;
}
.cause-action {
  display: grid;
  grid-template-columns: 1fr 1.65fr;
  gap: 26px;
  padding: 17px 0;
  border-top: 1px solid #e7ece7;
}
.cause-action p {
  font-size: 14.4px;
  line-height: 1.85;
  margin: 8px 0 0;
}
.mini-label {
  font-size: 9.6px;
  letter-spacing: 0.14em;
  color: #66847b;
  display: block;
  font-weight: 600;
}
.dos-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
}
.dos-grid > div {
  padding: 22px;
  border: 1px solid #d8e4de;
  background: #edf4ef;
  border-radius: 6px;
}
.dos-grid > div + div {
  border-color: #f0dbcf;
  background: #fdf1e9;
}
.dos-grid h3 {
  margin: 0 0 22px;
  font-size: 18px;
}
.dos-grid h3 > span {
  margin-right: 7px;
}
.dos-grid li {
  font-size: 14.4px;
  color: #567568;
  line-height: 1.8;
}
.dos-grid > div + div li {
  color: #8b6855;
}
.spec-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 30px;
}
.spec-layout h3 {
  margin: 0 0 14px;
  font-size: 18px;
}
.spec-layout h3:not(:first-child) {
  margin-top: 32px;
}
.spec-layout figure {
  margin: 0;
  align-self: center;
}
.spec-layout img {
  border-radius: 6px;
}
.spec-layout dl {
  font-size: 13.2px;
  margin: 0;
}
.spec-layout dl > div {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.spec-layout dt {
  color: var(--muted);
}
.spec-layout dd {
  margin: 0;
  max-width: 55%;
  text-align: right;
  color: var(--teal);
}
.source-note {
  font-size: 12px !important;
  line-height: 1.8;
  margin-top: 25px;
  color: #83918a !important;
}
.warranty-tag {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 30px;
}
.warranty-tag > span {
  font-family: Manrope, sans-serif;
  font-weight: 700;
  font-size: 60px;
  color: var(--teal);
  letter-spacing: -0.07em;
  line-height: 1;
}
.warranty-tag > div {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
}
.contact-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}
.contact-links > a {
  font-size: 18px;
  padding: 22px;
  border: 1px solid #cbded6;
  border-radius: 5px;
  background: #fff;
  word-break: break-word;
}
.contact-links .mini-label {
  margin-bottom: 10px;
}
.end-note {
  display: flex;
  gap: 25px;
  padding: 35px;
  background: var(--teal);
  color: #fff;
  border-radius: 8px;
}
.end-note > img {
  height: 66px;
  width: auto;
  align-self: center;
}
.end-note h3 {
  margin: 0 0 9px;
  font-size: 24px;
}
.end-note p {
  font-size: 14.4px;
  color: #c1d8d5;
  margin-bottom: 15px;
}
.end-note a {
  font-size: 13.2px;
  color: #8ddbe0;
}
footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding: 48px clamp(24px, 4.2vw, 72px);
  border-top: 1px solid var(--line);
  background: #fff;
}
footer img {
  width: 178px;
}
footer > div:first-child p {
  font-size: 10.8px;
  letter-spacing: 0.16em;
  margin: 10px 0 0;
  text-transform: uppercase;
  color: #6e8581;
}
footer > div:nth-child(2) > span {
  font-size: 9.6px;
  letter-spacing: 0.12em;
  color: var(--teal);
}
footer > div:nth-child(2) > p {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  margin: 9px 0 0;
}
.back-top {
  font-size: 13.2px;
  white-space: nowrap;
}
dialog {
  border: 1px solid #d7e1dc;
  border-radius: 12px;
  padding: 28px;
  width: min(650px, calc(100vw - 32px));
  max-height: 80vh;
  box-shadow: 0 30px 120px #143c4033;
}
dialog::backdrop {
  background: #14393b70;
  backdrop-filter: blur(5px);
}
.search-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.search-top h2 {
  font-size: 24px;
  margin: 0;
}
.search-top button {
  border: 0;
  background: none;
  font-size: 27px;
  color: var(--muted);
}
.search-field {
  display: flex;
  align-items: center;
  gap: 15px;
  border: 1px solid #bdcfc7;
  border-radius: 6px;
  padding: 10px 15px;
  margin: 23px 0 10px;
}
.search-field > span {
  font-size: 28px;
  line-height: 1;
}
.search-field input {
  border: 0;
  background: none;
  width: 100%;
  font-size: 16.8px;
  outline: none;
}
.search-field:focus-within {
  box-shadow: 0 0 0 2px var(--cyan);
}
#search-count {
  font-size: 13.2px;
  color: var(--muted);
  margin: 0 0 14px;
}
#search-results {
  max-height: 45vh;
  overflow: auto;
}
.search-result {
  display: block;
  padding: 16px 8px;
  border-top: 1px solid var(--line);
}
.search-result strong {
  font-size: 16.8px;
  font-weight: 600;
  display: block;
}
.search-result p {
  font-size: 14.4px;
  color: var(--muted);
  margin: 6px 0 0;
  line-height: 1.8;
}
.search-result mark {
  background: #ffdebd;
  color: var(--ink);
}
.search-footer {
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  padding-top: 15px;
  margin-top: 18px;
}
.search-footer > span {
  font-size: 9.6px;
  letter-spacing: 0.08em;
}
.toast {
  position: fixed;
  bottom: 25px;
  left: 50%;
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  background: var(--teal);
  color: #fff;
  font-size: 14.4px;
  padding: 11px 22px;
  border-radius: 5px;
  transition:
    opacity 0.2s,
    transform 0.2s;
  z-index: 100;
}
.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}
[hidden] {
  display: none !important;
}
@media (min-width: 1600px) {
  .header {
    padding-left: calc((100vw - 1456px) / 2);
    padding-right: calc((100vw - 1456px) / 2);
  }
}
@media (max-width: 1200px) {
  .header-actions {
    gap: 18px;
  }
  .website-link {
    display: none;
  }
  .header-label {
    font-size: 9.6px;
  }
  .header {
    gap: 18px;
  }
  .brand img {
    width: 180px;
  }
  .hero {
    gap: 4%;
    min-height: 550px;
  }
  .hero h1 {
    font-size: clamp(37px, 4.3vw, 58px);
  }
  .hero-description {
    font-size: 18px;
  }
  .manual-shell {
    grid-template-columns: 225px minmax(0, 1fr);
    gap: 45px;
  }
  .fact {
    padding-left: 30px;
  }
  .chapter-heading h2 {
    font-size: 29px;
  }
  .safety-strip a {
    margin-left: 31px;
  }
  .spec-layout {
    grid-template-columns: 1fr;
  }
  .spec-layout figure {
    max-width: 340px;
  }
  .mask-note {
    gap: 22px;
  }
}
@media (max-width: 900px) {
  .header {
    height: 80px;
    padding: 0 25px;
  }
  .header-divider,
  .header-label {
    display: none;
  }
  .hero {
    padding-top: 38px;
    min-height: 500px;
    gap: 26px;
  }
  .hero h1 {
    font-size: 36px;
  }
  .hero-eyebrow {
    font-size: 9.6px;
    flex-wrap: wrap;
    letter-spacing: 0.1em;
  }
  .version {
    font-size: 8.4px;
    padding-left: 8px;
    margin-left: 0;
  }
  .hero-cta {
    gap: 18px;
  }
  .primary-button {
    gap: 15px;
    font-size: 13.2px;
    padding: 12px 15px;
  }
  .text-link {
    font-size: 12px;
  }
  .hero-note {
    font-size: 10.8px;
  }
  .visual-label {
    top: 15px;
    left: 15px;
    font-size: 7.2px;
    padding: 7px 9px;
  }
  .session-pill {
    padding: 11px 14px;
    right: 14px;
    bottom: 14px;
  }
  .session-pill strong {
    font-size: 17px;
  }
  .session-pill span:not(.pill-icon) {
    font-size: 9.6px;
  }
  .facts {
    gap: 12px;
  }
  .fact {
    padding-left: 20px;
  }
  .fact > strong {
    font-size: 27px;
  }
  .fact p {
    font-size: 10.8px;
  }
  .fact-intro .eyebrow {
    font-size: 8.4px;
  }
  .fact-intro p {
    font-size: 15.6px;
  }
  .manual-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 33px;
    padding-top: 45px;
  }
  .toc > a {
    font-size: 12px;
    gap: 9px;
    padding: 7px;
  }
  .toc-label {
    font-size: 9.6px;
  }
  .toc-label > span {
    display: none;
  }
  .sidebar {
    top: 102px;
  }
  .chapter-heading h2 {
    font-size: 25px;
  }
  .chapter > p,
  .chapter > ul,
  .welcome > p {
    font-size: 15.6px;
  }
  .welcome h2 {
    font-size: 28px;
  }
  .component {
    padding: 19px;
  }
  .component h3 {
    font-size: 15px;
  }
  .component p {
    font-size: 13.2px;
  }
  .dos-grid {
    grid-template-columns: 1fr;
  }
  .mask-note {
    display: block;
  }
  .mask-note > img {
    width: 100%;
    max-height: 300px;
    object-position: 50% 35%;
  }
  .mask-note > div {
    padding: 25px;
  }
  .contact-links {
    grid-template-columns: 1fr;
  }
  .cause-action {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  footer {
    flex-wrap: wrap;
  }
  html {
    scroll-padding-top: 95px;
  }
}
@media (max-width: 680px) {
  .header {
    height: 72px;
    padding: 0 20px;
    gap: 14px;
  }
  .brand img {
    width: 155px;
  }
  .header-actions {
    gap: 16px;
  }
  .search-button {
    font-size: 0;
    gap: 0;
  }
  .search-button > span {
    font-size: 27px;
  }
  .search-button kbd {
    display: none;
  }
  .download-button {
    font-size: 12px;
    padding: 9px 12px;
    gap: 8px;
  }
  .download-button > span {
    font-size: 15px;
  }
  .hero {
    display: flex;
    flex-direction: column;
    padding: 30px 22px 25px;
    gap: 30px;
  }
  .hero-copy {
    padding: 5px 0 0;
    width: 100%;
  }
  .hero-eyebrow {
    font-size: 9.6px;
    margin-bottom: 24px;
    flex-wrap: nowrap;
    gap: 7px;
  }
  .version {
    font-size: 8.4px;
    margin-left: auto;
  }
  .hero h1 {
    font-size: clamp(32px, 8.1vw, 50px);
    line-height: 1.12;
    margin-bottom: 23px;
  }
  .hero-description {
    font-size: 16.8px;
    line-height: 1.85;
    margin-bottom: 24px;
  }
  .desktop-break {
    display: none;
  }
  .hero-cta {
    gap: 25px;
  }
  .primary-button {
    font-size: 14.4px;
    gap: 25px;
    padding: 13px 18px;
  }
  .text-link {
    font-size: 13.2px;
  }
  .hero-note {
    font-size: 10.8px;
    margin-top: 24px;
  }
  .hero-visual {
    width: 100%;
    aspect-ratio: 1.14;
    min-height: 0;
  }
  .hero-visual > img {
    object-position: center 50%;
  }
  .visual-label {
    font-size: 8.4px;
  }
  .session-pill strong {
    font-size: 19px;
  }
  .session-pill span:not(.pill-icon) {
    font-size: 10.8px;
  }
  .facts {
    grid-template-columns: 1fr 1fr 1fr;
    padding: 24px 22px;
    gap: 14px;
  }
  .fact-intro {
    display: none;
  }
  .fact {
    padding-left: 12px;
  }
  .fact:nth-child(2) {
    border-left: 0;
    padding-left: 0;
  }
  .fact > strong {
    font-size: 26px;
  }
  .fact > strong span {
    font-size: 12px;
    margin-left: 4px;
  }
  .fact p {
    font-size: 9.6px;
    line-height: 1.7;
  }
  .manual-shell {
    display: block;
    padding: 24px 22px 45px;
  }
  .sidebar {
    position: sticky;
    top: 72px;
    z-index: 20;
    margin: 0 -22px 30px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
  }
  .mobile-contents {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: var(--teal);
    color: #fff;
    border: 0;
    padding: 14px 22px;
    font-size: 13.2px;
    font-weight: 600;
    letter-spacing: 0.03em;
  }
  .sidebar-inner {
    display: none;
    padding: 20px 22px;
    background: #fff;
    max-height: 70vh;
    overflow: auto;
    box-shadow: 0 12px 25px #173a3b15;
  }
  .sidebar-inner.open {
    display: block;
  }
  .toc > a {
    font-size: 14.4px;
    padding: 10px 14px;
  }
  .toc-label > span {
    display: block;
    font-size: 8.4px;
  }
  .sidebar-help {
    display: none;
  }
  .print-button {
    padding-bottom: 0;
  }
  .welcome {
    padding-bottom: 30px;
  }
  .welcome h2 {
    font-size: 27px;
  }
  .welcome .eyebrow {
    font-size: 9.6px;
  }
  .welcome > p {
    font-size: 16.8px;
  }
  .safety-strip {
    padding: 16px;
  }
  .safety-strip a {
    font-size: 12px;
    margin-left: 31px;
  }
  .chapter {
    padding: 35px 0 40px;
  }
  .chapter-heading {
    margin-bottom: 25px;
    gap: 10px;
  }
  .chapter-heading h2 {
    font-size: 27px;
    line-height: 1.25;
    margin-top: 13px;
  }
  .chapter-heading .eyebrow {
    font-size: 8.4px;
    gap: 8px;
  }
  .chapter-subtitle {
    font-size: 15.6px;
  }
  .copy-link {
    width: 28px;
    height: 28px;
    font-size: 16px;
  }
  .chapter > p,
  .chapter > ul {
    font-size: 16.8px;
  }
  .chapter > h3 {
    font-size: 18px;
  }
  .notice {
    padding: 17px;
    gap: 12px;
  }
  .notice p {
    font-size: 14.4px;
  }
  .component-grid {
    grid-template-columns: 1fr;
  }
  .component:nth-child(odd) {
    border-right: 0;
  }
  .component:nth-last-child(2) {
    border-bottom: 1px solid var(--line);
  }
  .component {
    padding: 22px;
  }
  .component p {
    font-size: 14.4px;
  }
  .component h3 {
    font-size: 17px;
  }
  .step-title {
    font-size: 16px !important;
    gap: 12px;
  }
  .session-check {
    padding: 20px;
  }
  .session-check label {
    font-size: 14.4px;
  }
  .wide-photo img {
    aspect-ratio: 1.35;
  }
  .filter-tabs {
    gap: 6px;
  }
  .filter-tabs button {
    padding: 7px 10px;
    font-size: 10.8px;
  }
  .dos-grid > div {
    padding: 21px;
  }
  .spec-layout dl {
    font-size: 13.2px;
  }
  .contact-links > a {
    font-size: 16.8px;
  }
  .end-note {
    padding: 27px 22px;
    gap: 20px;
  }
  .end-note > img {
    height: 50px;
  }
  .end-note h3 {
    font-size: 21px;
  }
  .end-note p {
    font-size: 13.2px;
  }
  footer {
    padding: 30px 22px;
    gap: 25px;
  }
  footer > div:nth-child(2) {
    order: 3;
    width: 100%;
  }
  footer img {
    width: 150px;
  }
  .back-top {
    font-size: 12px;
  }
  html {
    scroll-padding-top: 132px;
  }
  .search-top h2 {
    font-size: 21px;
  }
  dialog {
    padding: 22px;
  }
  .search-field input {
    font-size: 14.4px;
  }
  .search-footer > span {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}
@media print {
  body {
    background: #fff;
    color: #000;
    font: 13.2pt/1.6 sans-serif;
  }
  .header,
  .hero,
  .facts,
  .sidebar,
  .copy-link,
  .filter-tabs,
  .print-button,
  .end-note,
  footer,
  dialog,
  .toast,
  .reading-progress,
  .check-title button {
    display: none !important;
  }
  .manual-shell {
    display: block;
    padding: 0;
    max-width: none;
  }
  .manual-content {
    max-width: none;
  }
  .welcome {
    padding: 0;
  }
  .chapter {
    padding: 20px 0;
    border-color: #aaa;
    break-before: auto;
  }
  .chapter h2 {
    font-size: 22pt;
  }
  .chapter h3 {
    font-size: 14pt;
  }
  details:not([open]) > .detail-body {
    display: block !important;
  }
  details {
    break-inside: avoid;
  }
  summary {
    padding: 12px 0;
  }
  .detail-plus {
    display: none;
  }
  .notice,
  .component,
  .cause-action,
  .dos-grid > div,
  .session-check {
    break-inside: avoid;
  }
  .trouble-group[hidden] {
    display: block !important;
  }
  .trouble-group {
    display: block !important;
  }
  .wide-photo img {
    max-height: 200px;
    width: auto;
  }
  .mask-note > img {
    width: 180px;
  }
  .search-result {
    display: none;
  }
  .component-grid,
  .dos-grid {
    display: block;
  }
  .component {
    border-bottom: 1px solid #ddd !important;
  }
  .chapter p,
  .chapter li {
    font-size: 13.2pt !important;
    color: #000 !important;
  }
  .spec-layout {
    display: block;
  }
  .spec-layout figure {
    max-width: 220px;
  }
  .welcome > p {
    font-size: 13.2pt;
    color: #000;
  }
  .contact-links a {
    padding: 10px;
  }
  .eyebrow {
    color: #555 !important;
  }
  .session-check input {
    appearance: none;
    width: 11px;
    height: 11px;
    border: 1px solid #777;
  }
  .session-check input:checked + span {
    color: inherit;
  }
  .notice {
    background: #fff;
    border: 1px solid #999;
  }
  .source-note {
    font-size: 9.6pt !important;
  }
  .chapter-heading {
    margin-bottom: 15px;
  }
}
/* Readability: navigation and body text increased by 20%; headings and icons unchanged. */

/* The larger navigation remains reachable on shorter desktop screens. */
@media (min-width: 681px) {
  .sidebar-inner {
    max-height: calc(100dvh - 145px);
    overflow-y: auto;
    scrollbar-width: thin;
  }
}