:root {
  --graphite: #171a16;
  --graphite-2: #232820;
  --acid: #b7ef3b;
  --acid-dark: #7da91b;
  --yellow: #ffd75a;
  --orange: #ff7a36;
  --ivory: #fffdf3;
  --mist: #eef1e8;
  --ink: #252922;
  --muted: #6d7467;
  --line: #d5dacd;
  --white: #ffffff;
  --shell: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--ivory);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: -90px;
  left: 18px;
  z-index: 1000;
  padding: 10px 15px;
  color: var(--graphite);
  background: var(--acid);
  font-weight: 850;
}

.skip-link:focus {
  top: 18px;
}

.header-shell,
.hero,
.section,
.final-section,
.footer-shell {
  width: min(calc(100% - 40px), var(--shell));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--white);
  background: rgba(23, 26, 22, 0.98);
  border-bottom: 1px solid #343a30;
  backdrop-filter: blur(16px);
}

.header-shell {
  min-height: 78px;
  display: grid;
  grid-template-columns: 260px 1fr 145px;
  gap: 28px;
  align-items: center;
}

.brand-lockup {
  width: max-content;
  display: flex;
  align-items: center;
}

.brand-icon {
  position: relative;
  z-index: 2;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  padding: 5px;
  background: var(--acid);
  border-radius: 50%;
  box-shadow: 0 0 0 5px var(--graphite);
}

.brand-icon img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 50%;
}

.brand-ribbon {
  min-width: 195px;
  min-height: 45px;
  display: flex;
  align-items: center;
  margin-left: -5px;
  padding: 6px 25px 6px 18px;
  background: #080a07;
  clip-path: polygon(0 0, 100% 0, 90% 100%, 0 100%);
  border-left: 4px solid var(--acid);
}

.brand-ribbon img {
  width: auto;
  height: 31px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 26px;
  color: #aeb6a6;
  font-size: 12px;
  font-weight: 800;
}

.site-nav a {
  padding: 25px 0 23px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--acid);
}

.header-cta {
  justify-self: end;
  padding: 11px 14px;
  color: var(--graphite);
  background: var(--acid);
  text-align: center;
  font-size: 12px;
  font-weight: 900;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: #ccff62;
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid #444b40;
}

.menu-button span {
  display: block;
  width: 19px;
  height: 2px;
  margin: 4px auto;
  background: var(--white);
}

.hero {
  min-height: 700px;
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 58px;
  align-items: center;
  padding-top: 76px;
  padding-bottom: 76px;
  color: var(--white);
  background:
    linear-gradient(rgba(183, 239, 59, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(183, 239, 59, 0.04) 1px, transparent 1px),
    var(--graphite);
  background-size: 52px 52px;
}

.eyebrow,
.section-label {
  margin: 0 0 15px;
  color: var(--acid-dark);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: var(--acid);
}

.hero h1 {
  margin: 0;
  color: var(--white);
  font-size: clamp(54px, 7vw, 92px);
  line-height: 0.96;
  letter-spacing: -0.06em;
}

.hero-lead {
  max-width: 670px;
  margin: 29px 0 0;
  color: #b7c0b0;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
  margin-top: 34px;
}

.primary-button,
.secondary-button {
  min-height: 57px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 13px 20px;
  font-weight: 900;
}

.primary-button {
  min-width: 260px;
  color: var(--graphite);
  background: var(--acid);
}

.primary-button:hover,
.primary-button:focus-visible {
  background: #ccff62;
}

.primary-button b {
  font-size: 20px;
}

.secondary-button {
  color: var(--white);
  border: 1px solid #485044;
}

.secondary-button:hover,
.secondary-button:focus-visible {
  border-color: var(--acid);
}

.hero-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 35px;
  border-top: 1px solid #40473d;
  border-left: 1px solid #40473d;
}

.hero-summary article {
  padding: 13px;
  border-right: 1px solid #40473d;
  border-bottom: 1px solid #40473d;
}

.hero-summary b,
.hero-summary span {
  display: block;
}

.hero-summary b {
  color: var(--acid);
  font-size: 9px;
}

.hero-summary span {
  margin-top: 3px;
  color: #a8b1a1;
  font-size: 10px;
}

.android-console {
  overflow: hidden;
  background: #0c0f0b;
  border: 1px solid #4a5345;
  box-shadow: 0 34px 85px rgba(0, 0, 0, 0.35);
}

.console-top {
  min-height: 43px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 18px;
  color: #96a08e;
  background: #20251e;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.console-top > div {
  display: flex;
  gap: 7px;
}

.console-top i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
}

.console-top i:nth-child(2) {
  background: var(--yellow);
}

.console-top i:nth-child(3) {
  background: var(--acid);
}

.console-body {
  padding: 22px;
}

.console-app {
  padding: 15px;
  background:
    linear-gradient(rgba(183, 239, 59, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(183, 239, 59, 0.045) 1px, transparent 1px),
    #151a14;
  background-size: 34px 34px;
}

.console-app img {
  width: 100%;
  max-height: 280px;
  object-fit: contain;
}

.console-status {
  margin-top: 14px;
}

.console-status article {
  display: grid;
  grid-template-columns: 34px 1fr 52px;
  gap: 12px;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid #31372e;
}

.console-status article > span {
  color: var(--acid);
  font-size: 10px;
  font-weight: 900;
}

.console-status b,
.console-status small {
  display: block;
}

.console-status b {
  color: var(--white);
  font-size: 12px;
}

.console-status small {
  color: #788172;
  font-size: 9px;
}

.console-status i {
  color: var(--yellow);
  font-size: 8px;
  font-style: normal;
  font-weight: 900;
  text-align: right;
}

.console-button {
  display: flex;
  justify-content: center;
  margin-top: 17px;
  padding: 12px;
  color: var(--graphite);
  background: var(--acid);
  font-size: 11px;
  font-weight: 950;
  letter-spacing: 0.08em;
}

.section {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 58px;
  padding-top: 104px;
  padding-bottom: 104px;
}

.section-code {
  position: sticky;
  top: 112px;
  align-self: start;
  height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 15px 0;
  border-top: 2px solid var(--graphite);
  border-bottom: 2px solid var(--graphite);
}

.section-code span {
  color: var(--acid-dark);
  font-size: 55px;
  font-weight: 950;
  line-height: 1;
}

.section-code small {
  writing-mode: vertical-rl;
  color: var(--graphite);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.section-code-dark {
  border-color: var(--acid);
}

.section-code-dark small {
  color: var(--acid);
}

.section-code-light {
  border-color: #707a68;
}

.section-code-light small {
  color: #9ba792;
}

.section-heading {
  max-width: 870px;
}

.section-heading h2,
.checklist-heading h2,
.reinstall-heading h2,
.final-copy h2 {
  margin: 0;
  color: var(--graphite);
  font-size: clamp(33px, 4.3vw, 53px);
  line-height: 1.16;
  letter-spacing: -0.04em;
}

.section-heading > p:not(.section-label),
.checklist-heading > p:not(.section-label),
.reinstall-heading > p:not(.section-label) {
  margin: 20px 0 0;
  color: var(--muted);
}

.android-entry {
  background: var(--ivory);
}

.entry-line {
  display: grid;
  grid-template-columns: 1fr 40px 1fr 40px 1fr 160px;
  gap: 14px;
  align-items: center;
  margin-top: 43px;
  padding: 24px;
  color: var(--white);
  background: var(--graphite);
}

.entry-line div {
  min-width: 0;
}

.entry-line span,
.entry-line strong {
  display: block;
}

.entry-line span {
  color: var(--acid);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.entry-line strong {
  margin-top: 4px;
  font-size: 12px;
}

.entry-line i {
  color: #76806f;
  font-style: normal;
  text-align: center;
}

.entry-line a {
  padding: 12px 14px;
  color: var(--graphite);
  background: var(--acid);
  text-align: center;
  font-size: 11px;
  font-weight: 900;
}

.checklist-section {
  color: var(--white);
  background: var(--graphite);
}

.checklist-heading h2 {
  color: var(--white);
}

.checklist-heading > p:not(.section-label) {
  color: #abb4a4;
}

.checklist-panel {
  margin-top: 42px;
  border-top: 1px solid #42493e;
}

.checklist-progress {
  padding: 23px 0;
  border-bottom: 1px solid #42493e;
}

.checklist-progress > div:first-child {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #bbc4b3;
  font-size: 11px;
}

.checklist-progress strong {
  color: var(--acid);
  font-size: 14px;
}

.progress-track {
  height: 8px;
  margin-top: 10px;
  overflow: hidden;
  background: #30362d;
}

.progress-track i {
  display: block;
  width: 0;
  height: 100%;
  background: var(--acid);
  transition: width 0.25s ease;
}

.check-item {
  position: relative;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 17px;
  padding: 22px 0;
  border-bottom: 1px solid #42493e;
  cursor: pointer;
}

.check-item input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.fake-check {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid #697263;
}

.check-item input:checked + .fake-check {
  color: var(--graphite);
  background: var(--acid);
  border-color: var(--acid);
}

.check-item input:checked + .fake-check::after {
  content: "✓";
  font-size: 14px;
  font-weight: 950;
}

.check-item strong {
  color: var(--white);
  font-size: 15px;
}

.check-item p {
  margin: 4px 0 0;
  color: #929c8b;
  font-size: 12px;
}

.system-section {
  background: var(--mist);
}

.system-ledger {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 42px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.system-ledger article {
  min-height: 250px;
  padding: 25px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.system-ledger b {
  color: var(--acid-dark);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.system-ledger h3 {
  margin: 45px 0 10px;
  color: var(--graphite);
  font-size: 19px;
}

.system-ledger p {
  margin: 0;
  color: var(--muted);
}

.system-warning {
  display: grid;
  grid-template-columns: 165px 1fr;
  gap: 25px;
  margin-top: 22px;
  padding: 22px 25px;
  color: var(--white);
  background: var(--orange);
}

.system-warning strong {
  font-size: 13px;
}

.system-warning p {
  margin: 0;
  color: #fff0e6;
  font-size: 12px;
}

.install-section {
  color: var(--white);
  background: var(--graphite-2);
}

.section-heading-light h2 {
  color: var(--white);
}

.section-heading-light > p:not(.section-label) {
  color: #aeb7a7;
}

.install-route {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 42px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid #465040;
  border-left: 1px solid #465040;
}

.install-route li {
  min-height: 290px;
  padding: 24px;
  border-right: 1px solid #465040;
  border-bottom: 1px solid #465040;
}

.install-route li:nth-child(2),
.install-route li:nth-child(4) {
  background: rgba(183, 239, 59, 0.045);
}

.route-number {
  color: var(--acid);
  font-size: 58px;
  font-weight: 950;
  line-height: 1;
}

.install-route span {
  display: block;
  margin-top: 22px;
  color: var(--yellow);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.install-route h3 {
  margin: 9px 0 10px;
  font-size: 18px;
}

.install-route p {
  margin: 0;
  color: #9fa99a;
  font-size: 12px;
}

.install-action {
  display: grid;
  grid-template-columns: 150px 1fr 180px;
  gap: 24px;
  align-items: center;
  margin-top: 22px;
  padding: 22px 24px;
  color: var(--graphite);
  background: var(--acid);
}

.install-action span {
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.install-action strong {
  font-size: 15px;
}

.install-action a {
  padding: 12px 15px;
  color: var(--white);
  background: var(--graphite);
  text-align: center;
  font-size: 11px;
  font-weight: 900;
}

.permissions-section {
  background: var(--ivory);
}

.permission-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 42px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.permission-matrix article {
  min-height: 225px;
  padding: 25px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.permission-matrix article:nth-child(2),
.permission-matrix article:nth-child(3) {
  background: var(--mist);
}

.permission-matrix span {
  color: var(--acid-dark);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.permission-matrix h3 {
  margin: 28px 0 9px;
  color: var(--graphite);
  font-size: 18px;
}

.permission-matrix p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.content-section {
  background: var(--mist);
}

.content-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 42px;
}

.content-row article {
  min-height: 220px;
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 20px;
  align-items: center;
  padding: 25px;
  background: var(--ivory);
  border: 1px solid var(--line);
}

.content-row img {
  width: 78px;
  height: 78px;
  object-fit: contain;
}

.content-row span {
  color: var(--acid-dark);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.content-row h3 {
  margin: 6px 0 8px;
  color: var(--graphite);
  font-size: 18px;
}

.content-row p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.repair-section {
  color: var(--white);
  background: var(--graphite);
}

.repair-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 42px;
  border-top: 1px solid #42493e;
  border-left: 1px solid #42493e;
}

.repair-board article {
  min-height: 220px;
  padding: 25px;
  border-right: 1px solid #42493e;
  border-bottom: 1px solid #42493e;
}

.repair-board article:nth-child(2),
.repair-board article:nth-child(4),
.repair-board article:nth-child(6) {
  background: rgba(183, 239, 59, 0.04);
}

.repair-board b {
  color: var(--acid);
  font-size: 9px;
  letter-spacing: 0.1em;
}

.repair-board h3 {
  margin: 27px 0 9px;
  font-size: 18px;
}

.repair-board p {
  margin: 0;
  color: #9aa493;
  font-size: 12px;
}

.reinstall-section {
  background: var(--ivory);
}

.reinstall-content {
  display: grid;
  grid-template-columns: 0.62fr 1.38fr;
  gap: 70px;
}

.reinstall-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--graphite);
}

.reinstall-steps li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 15px;
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
}

.reinstall-steps b {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--graphite);
  background: var(--acid);
  font-size: 10px;
}

.reinstall-steps p {
  margin: 0;
  color: var(--muted);
}

.faq-section {
  background: var(--mist);
}

.faq-list {
  margin-top: 42px;
  border-top: 2px solid var(--graphite);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 24px 55px 24px 0;
  color: var(--graphite);
  font-size: 16px;
  font-weight: 850;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  position: absolute;
  right: 4px;
  top: 20px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--acid-dark);
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: transform 0.2s ease;
}

.faq-list details[open] summary span {
  transform: rotate(45deg);
}

.faq-list p {
  margin: -2px 0 23px;
  color: var(--muted);
}

.related-section {
  background: var(--ivory);
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 42px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.related-links a {
  min-height: 128px;
  display: grid;
  align-content: center;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.related-links a:last-child {
  grid-column: 1 / -1;
}

.related-links a:hover,
.related-links a:focus-visible {
  background: var(--mist);
}

.related-links strong {
  color: var(--acid-dark);
  font-size: 15px;
}

.related-links span {
  margin-top: 5px;
  color: var(--muted);
  font-size: 11px;
}

.final-section {
  min-height: 285px;
  display: grid;
  grid-template-columns: 105px 1fr 250px;
  gap: 40px;
  align-items: center;
  margin-bottom: 90px;
  padding: 44px 50px;
  color: var(--white);
  background: var(--orange);
}

.final-mark {
  width: 90px;
  height: 120px;
  display: grid;
  place-items: center;
  align-content: center;
  color: var(--graphite);
  background: var(--acid);
}

.final-mark span {
  font-size: 46px;
  font-weight: 950;
  line-height: 1;
}

.final-mark small {
  margin-top: 4px;
  font-size: 8px;
  font-weight: 900;
}

.final-copy p {
  margin: 0 0 9px;
  color: #ffe5d6;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.final-copy h2 {
  color: var(--white);
  font-size: clamp(28px, 3.5vw, 43px);
}

.final-copy span {
  display: block;
  margin-top: 13px;
  color: #fff0e7;
  font-size: 11px;
}

.final-button {
  min-height: 70px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 16px 20px;
  color: var(--graphite);
  background: var(--acid);
  font-weight: 900;
}

.final-button b {
  font-size: 20px;
}

.site-footer {
  padding: 52px 0 32px;
  color: #9da795;
  background: #0b0d0a;
}

.footer-shell {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px 55px;
}

.footer-brand-lockup {
  display: flex;
  align-items: center;
}

.footer-icon {
  position: relative;
  z-index: 2;
  width: 48px;
  height: 48px;
  padding: 4px;
  background: var(--acid);
  border-radius: 50%;
}

.footer-ribbon {
  min-width: 190px;
  min-height: 42px;
  display: flex;
  align-items: center;
  margin-left: -4px;
  padding: 5px 23px 5px 16px;
  background: #030403;
  clip-path: polygon(0 0, 100% 0, 90% 100%, 0 100%);
  border-left: 4px solid var(--acid);
}

.footer-ribbon img {
  width: auto;
  height: 29px;
  object-fit: contain;
}

.footer-brand p {
  max-width: 710px;
  margin: 17px 0 0;
  color: #66705f;
  font-size: 11px;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 8px 25px;
  font-size: 12px;
  font-weight: 700;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--white);
}

.copyright {
  grid-column: 1 / -1;
  margin: 5px 0 0;
  padding-top: 21px;
  color: #434b3e;
  border-top: 1px solid #282e25;
  font-size: 11px;
}

.mobile-download {
  display: none;
}

@media (max-width: 960px) {
  .header-shell {
    grid-template-columns: 245px 1fr 135px;
  }

  .site-nav {
    gap: 16px;
  }

  .hero {
    gap: 35px;
  }

  .entry-line {
    grid-template-columns: 1fr 30px 1fr 30px 1fr;
  }

  .entry-line a {
    grid-column: 1 / -1;
    width: 180px;
    justify-self: end;
  }

  .install-route {
    grid-template-columns: repeat(2, 1fr);
  }

  .repair-board {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 820px) {
  html {
    scroll-padding-top: 72px;
  }

  .header-shell {
    min-height: 70px;
    grid-template-columns: 1fr auto;
  }

  .header-cta {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 20px;
    right: 20px;
    top: calc(100% + 8px);
    display: none;
    padding: 10px;
    background: var(--graphite);
    border: 1px solid #42493e;
    box-shadow: 0 22px 55px rgba(0, 0, 0, 0.3);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    padding: 11px 12px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-summary {
    max-width: 720px;
    margin-inline: auto;
    text-align: left;
  }

  .android-console {
    width: min(100%, 620px);
    margin-inline: auto;
  }

  .section {
    grid-template-columns: 1fr;
  }

  .section-code {
    position: static;
    height: auto;
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 12px 0;
  }

  .section-code small {
    writing-mode: horizontal-tb;
  }

  .system-ledger,
  .permission-matrix,
  .content-row,
  .reinstall-content {
    grid-template-columns: 1fr;
  }

  .final-section {
    grid-template-columns: 100px 1fr;
  }

  .final-button {
    grid-column: 2;
    width: 250px;
  }

  .footer-shell {
    grid-template-columns: 1fr;
  }

  .copyright {
    grid-column: auto;
  }
}

@media (max-width: 600px) {
  body {
    padding-bottom: 70px;
  }

  .header-shell,
  .hero,
  .section,
  .final-section,
  .footer-shell {
    width: min(calc(100% - 28px), var(--shell));
  }

  .brand-icon {
    width: 48px;
    height: 48px;
  }

  .brand-icon img {
    width: 38px;
    height: 38px;
  }

  .brand-ribbon {
    min-width: 170px;
  }

  .brand-ribbon img {
    height: 28px;
  }

  .hero {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .hero h1 {
    font-size: clamp(46px, 15vw, 68px);
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }

  .hero-summary {
    grid-template-columns: 1fr;
  }

  .section {
    padding-top: 70px;
    padding-bottom: 70px;
  }

  .section-heading h2,
  .checklist-heading h2,
  .reinstall-heading h2 {
    font-size: clamp(30px, 10vw, 41px);
  }

  .entry-line {
    grid-template-columns: 1fr;
  }

  .entry-line i {
    transform: rotate(90deg);
  }

  .entry-line a {
    grid-column: auto;
    width: 100%;
    justify-self: stretch;
  }

  .check-item {
    grid-template-columns: 30px 1fr;
    gap: 13px;
  }

  .system-ledger,
  .install-route,
  .repair-board,
  .related-links {
    grid-template-columns: 1fr;
  }

  .system-warning {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .install-route li {
    min-height: 0;
  }

  .install-action {
    grid-template-columns: 1fr;
  }

  .install-action a {
    width: 100%;
  }

  .permission-matrix article,
  .repair-board article {
    min-height: 0;
  }

  .content-row article {
    grid-template-columns: 70px 1fr;
    gap: 14px;
  }

  .content-row img {
    width: 62px;
    height: 62px;
  }

  .faq-list summary {
    font-size: 15px;
  }

  .related-links a:last-child {
    grid-column: auto;
  }

  .final-section {
    grid-template-columns: 1fr;
    padding: 34px 23px;
  }

  .final-mark {
    width: 76px;
    height: 98px;
  }

  .final-button {
    grid-column: auto;
    width: 100%;
  }

  .footer-nav {
    grid-template-columns: 1fr 1fr;
  }

  .mobile-download {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 120;
    min-height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 9px 14px;
    color: var(--white);
    background: rgba(11, 13, 10, 0.97);
    border-top: 1px solid #343b31;
  }

  .mobile-download > div {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mobile-download img {
    width: 44px;
    height: 44px;
    object-fit: contain;
    border-radius: 10px;
  }

  .mobile-download small,
  .mobile-download strong {
    display: block;
    line-height: 1.2;
  }

  .mobile-download small {
    color: #687261;
    font-size: 10px;
  }

  .mobile-download strong {
    margin-top: 3px;
    font-size: 13px;
  }

  .mobile-download > a {
    padding: 11px 15px;
    color: var(--graphite);
    background: var(--acid);
    font-size: 13px;
    font-weight: 900;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}