:root {
  --navy: #0b1220;
  --navy-2: #111b2e;
  --blue: #1665d8;
  --blue-bright: #2f83ff;
  --cyan: #5dd7e8;
  --ice: #eaf2fb;
  --paper: #f8fafc;
  --white: #ffffff;
  --ink: #182438;
  --muted: #65738a;
  --line: #d9e1eb;
  --green: #24b47e;
  --shell: 1180px;
  --shadow: 0 28px 80px rgba(11, 18, 32, 0.18);
}

* {
  box-sizing: border-box;
}

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

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

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

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

button {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  top: -90px;
  left: 18px;
  z-index: 1000;
  padding: 11px 16px;
  color: var(--white);
  background: var(--blue);
  font-weight: 850;
  transition: top 0.2s ease;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 18, 32, 0.96);
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(16px);
}

.header-shell {
  min-height: 76px;
  display: grid;
  grid-template-columns: 210px 1fr 170px;
  align-items: center;
  gap: 26px;
}

.brand {
  width: max-content;
}

.brand img,
.footer-brand img {
  width: auto;
  height: 37px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: 30px;
  color: #a8b7cc;
  font-size: 13px;
  font-weight: 760;
}

.site-nav a {
  padding: 25px 0;
  transition: color 0.2s ease;
}

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

.header-cta {
  justify-self: end;
  min-width: 160px;
  padding: 11px 16px;
  color: var(--white);
  background: var(--blue);
  border: 1px solid var(--blue);
  text-align: center;
  font-size: 13px;
  font-weight: 850;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: var(--blue-bright);
  border-color: var(--blue-bright);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding: 104px 0 190px;
  color: var(--white);
  background:
    radial-gradient(circle at 15% 25%, rgba(47, 131, 255, 0.22), transparent 28%),
    radial-gradient(circle at 88% 12%, rgba(93, 215, 232, 0.16), transparent 22%),
    linear-gradient(145deg, #09101d 0%, #101c31 58%, #0b1630 100%);
}

.hero::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -370px;
  width: 950px;
  height: 600px;
  transform: translateX(-50%);
  border: 1px solid rgba(93, 215, 232, 0.18);
  border-radius: 50%;
  box-shadow:
    0 0 0 80px rgba(47, 131, 255, 0.035),
    0 0 0 160px rgba(47, 131, 255, 0.022);
}

.hero-lines {
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.13) 1px, transparent 1px);
  background-size: 70px 70px;
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
}

.hero-shell {
  position: relative;
  z-index: 2;
  max-width: 970px;
  text-align: center;
}

.hero-kicker,
.section-label {
  margin: 0 0 17px;
  color: var(--cyan);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(50px, 7vw, 88px);
  line-height: 1.03;
  letter-spacing: -0.055em;
}

.hero-description {
  max-width: 820px;
  margin: 27px auto 0;
  color: #bdc9d9;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 35px;
}

.button {
  min-height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 14px 23px;
  border: 1px solid transparent;
  font-weight: 850;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.button-main {
  min-width: 250px;
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 15px 36px rgba(22, 101, 216, 0.3);
}

.button-main:hover,
.button-main:focus-visible {
  transform: translateY(-2px);
  background: var(--blue-bright);
  box-shadow: 0 20px 45px rgba(22, 101, 216, 0.38);
}

.button-secondary {
  color: var(--white);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.24);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  background: rgba(255, 255, 255, 0.09);
}

.hero-answer {
  max-width: 840px;
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 22px;
  margin: 38px auto 0;
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: left;
}

.hero-answer strong {
  color: var(--cyan);
  font-size: 13px;
}

.hero-answer span {
  color: #aab9cd;
  font-size: 14px;
}

.installer-wrap {
  position: relative;
  z-index: 6;
  width: min(calc(100% - 40px), var(--shell));
  margin: -112px auto 0;
}

.installer-window {
  overflow: hidden;
  background: var(--white);
  border: 1px solid rgba(11, 18, 32, 0.13);
  box-shadow: var(--shadow);
}

.window-bar {
  min-height: 48px;
  display: grid;
  grid-template-columns: 140px 1fr 140px;
  align-items: center;
  padding: 0 19px;
  color: #6c7890;
  background: #edf2f8;
  border-bottom: 1px solid #dce4ee;
  font-size: 11px;
}

.window-controls {
  display: flex;
  gap: 7px;
}

.window-controls span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #93a2b5;
}

.window-controls span:first-child {
  background: #ed6a5f;
}

.window-controls span:nth-child(2) {
  background: #f5bf4f;
}

.window-controls span:last-child {
  background: #61c554;
}

.window-bar p {
  margin: 0;
  text-align: center;
  font-weight: 800;
}

.window-bar small {
  justify-self: end;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.installer-main {
  display: grid;
  grid-template-columns: 260px 1fr;
}

.installer-sidebar {
  padding: 30px 24px;
  color: #b8c8dc;
  background: var(--navy-2);
}

.sidebar-app {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 14px;
  align-items: center;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-app img {
  width: 56px;
  height: 56px;
  border-radius: 13px;
}

.sidebar-app small {
  display: block;
  color: #7087a5;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.sidebar-app strong {
  display: block;
  color: var(--white);
  font-size: 20px;
}

.installer-sidebar nav {
  display: grid;
  margin-top: 22px;
}

.installer-sidebar nav a {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 12px 10px;
  color: #91a4bd;
  font-size: 13px;
  font-weight: 760;
  border-left: 2px solid transparent;
}

.installer-sidebar nav a span {
  color: #657995;
  font-size: 10px;
}

.installer-sidebar nav a.is-active {
  color: var(--white);
  background: rgba(47, 131, 255, 0.12);
  border-left-color: var(--blue-bright);
}

.installer-sidebar > p {
  margin: 28px 0 0;
  color: #70839e;
  font-size: 11px;
  line-height: 1.7;
}

.installer-content {
  padding: 34px 38px 36px;
}

.installer-heading {
  display: flex;
  justify-content: space-between;
  gap: 25px;
  align-items: flex-start;
}

.installer-heading p {
  margin: 0 0 7px;
  color: var(--blue);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.installer-heading h2 {
  margin: 0;
  color: var(--navy);
  font-size: 29px;
  line-height: 1.2;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 11px;
  color: #19895d;
  background: #e9f8f2;
  border: 1px solid #bcebd9;
  font-size: 11px;
  font-weight: 850;
}

.status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(36, 180, 126, 0.12);
}

.package-row {
  display: grid;
  grid-template-columns: 76px 1fr 160px;
  gap: 24px;
  align-items: center;
  margin-top: 28px;
  padding: 24px;
  background: #f5f8fc;
  border: 1px solid #dbe4ef;
}

.package-icon {
  width: 64px;
  height: 64px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  padding: 8px;
  background: var(--blue);
  box-shadow: 0 10px 24px rgba(22, 101, 216, 0.22);
}

.package-icon span {
  background: rgba(255, 255, 255, 0.94);
}

.package-copy small,
.package-action small {
  color: #8290a4;
  font-size: 10px;
  font-weight: 850;
}

.package-copy h3 {
  margin: 2px 0 7px;
  color: var(--navy);
  font-size: 20px;
}

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

.package-action {
  text-align: right;
}

.package-action strong {
  display: block;
  margin: 2px 0 8px;
  color: var(--navy);
  font-size: 21px;
}

.package-action a {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 132px;
  color: var(--white);
  background: var(--blue);
  font-size: 12px;
  font-weight: 850;
}

.installer-notes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 20px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.installer-notes div {
  padding: 14px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.installer-notes span,
.installer-notes strong {
  display: block;
}

.installer-notes span {
  color: #8996a9;
  font-size: 10px;
  font-weight: 800;
}

.installer-notes strong {
  margin-top: 2px;
  color: var(--navy);
  font-size: 13px;
}

.section {
  padding: 104px 0;
}

.intro-section {
  background: var(--paper);
}

.intro-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 90px;
  align-items: start;
}

.intro-heading h2,
.requirements-head h2,
.install-title h2,
.trouble-heading h2,
.version-layout h2,
.faq-heading h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(32px, 4.2vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.035em;
}

.intro-lead {
  margin: 0;
  color: #24334b;
  font-size: 22px;
  font-weight: 680;
  line-height: 1.65;
}

.intro-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 38px;
  margin-top: 34px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.intro-columns p {
  margin: 0;
  color: var(--muted);
}

.requirements-section {
  background: var(--ice);
}

.requirements-head {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 80px;
  align-items: end;
}

.requirements-head > p {
  margin: 0;
  color: var(--muted);
}

.mode-switch {
  display: inline-flex;
  margin-top: 38px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid #cbd8e7;
}

.mode-switch button {
  min-width: 120px;
  padding: 9px 15px;
  color: #667891;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 12px;
  font-weight: 850;
}

.mode-switch button.is-active {
  color: var(--white);
  background: var(--blue);
}

.requirements-board {
  margin-top: 22px;
  background: var(--white);
  border-top: 3px solid var(--blue);
  box-shadow: 0 24px 65px rgba(11, 18, 32, 0.08);
}

.requirements-board article {
  display: grid;
  grid-template-columns: 55px minmax(200px, 1fr) minmax(190px, 0.7fr) minmax(240px, 1fr);
  gap: 22px;
  align-items: center;
  min-height: 104px;
  padding: 20px 28px;
  border-bottom: 1px solid var(--line);
}

.requirements-board article:last-child {
  border-bottom: 0;
}

.req-index {
  color: var(--blue);
  font-size: 11px;
  font-weight: 900;
}

.req-name small {
  display: block;
  color: #8795a8;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.req-name h3 {
  margin: 4px 0 0;
  color: var(--navy);
  font-size: 17px;
}

.requirements-board article > strong {
  color: var(--blue);
  font-size: 19px;
}

.requirements-board article > p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.requirements-note {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  padding: 18px 20px;
  color: #53657e;
  background: rgba(255, 255, 255, 0.6);
  border-left: 3px solid var(--cyan);
  font-size: 13px;
}

.requirements-note b {
  flex: 0 0 auto;
  color: var(--navy);
}

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

.install-title {
  max-width: 810px;
  margin: 0 auto 55px;
  text-align: center;
}

.install-title > p:last-child {
  max-width: 680px;
  margin: 19px auto 0;
  color: var(--muted);
}

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

.install-track li {
  position: relative;
  min-height: 285px;
  padding: 27px 24px 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.install-track li::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: var(--blue);
  transition: width 0.25s ease;
}

.install-track li:hover::after {
  width: 100%;
}

.track-number {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--blue);
  background: #eaf2ff;
  font-size: 11px;
  font-weight: 900;
}

.track-copy h3 {
  margin: 50px 0 12px;
  color: var(--navy);
  font-size: 18px;
  line-height: 1.35;
}

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

.install-download {
  display: flex;
  justify-content: space-between;
  gap: 25px;
  align-items: center;
  margin-top: 24px;
  padding: 24px 28px;
  color: var(--white);
  background: var(--navy);
}

.install-download strong,
.install-download span {
  display: block;
}

.install-download strong {
  font-size: 18px;
}

.install-download span {
  margin-top: 2px;
  color: #9eacc1;
  font-size: 13px;
}

.install-download a {
  flex: 0 0 auto;
  min-width: 170px;
  padding: 12px 18px;
  color: var(--white);
  background: var(--blue);
  text-align: center;
  font-size: 13px;
  font-weight: 850;
}

.troubleshooting {
  color: var(--white);
  background: var(--navy);
}

.troubleshooting-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 80px;
  align-items: start;
}

.trouble-heading {
  position: sticky;
  top: 110px;
}

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

.trouble-heading > p:not(.section-label) {
  margin: 23px 0 0;
  color: #96a6bc;
}

.trouble-list {
  border-top: 1px solid rgba(255, 255, 255, 0.17);
}

.trouble-list article {
  display: grid;
  grid-template-columns: 100px 1fr 1.1fr;
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.17);
}

.trouble-list span {
  color: var(--cyan);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.trouble-list h3 {
  margin: -4px 0 0;
  font-size: 18px;
  line-height: 1.4;
}

.trouble-list p {
  margin: 0;
  color: #91a2b9;
  font-size: 13px;
}

.version-section {
  background: var(--ice);
}

.version-layout {
  display: grid;
  grid-template-columns: 0.58fr 1.42fr;
  gap: 75px;
  align-items: start;
}

.version-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid #cbd7e5;
  border-left: 1px solid #cbd7e5;
}

.version-row article {
  min-height: 245px;
  padding: 26px 23px;
  background: rgba(255, 255, 255, 0.55);
  border-right: 1px solid #cbd7e5;
  border-bottom: 1px solid #cbd7e5;
}

.version-row article.is-current {
  color: var(--white);
  background: var(--blue);
}

.version-row span {
  color: var(--blue);
  font-size: 11px;
  font-weight: 900;
}

.version-row article.is-current span {
  color: #bdebf2;
}

.version-row h3 {
  margin: 42px 0 12px;
  font-size: 18px;
  line-height: 1.4;
}

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

.version-row article.is-current p {
  color: #d9e8ff;
}

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

.faq-grid {
  display: grid;
  grid-template-columns: minmax(290px, 0.7fr) minmax(0, 1.3fr);
  gap: 85px;
  align-items: start;
}

.faq-heading {
  position: sticky;
  top: 110px;
}

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

.faq-cta {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 25px;
  padding: 11px 18px;
  color: var(--white);
  background: var(--blue);
  font-size: 13px;
  font-weight: 850;
}

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

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

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

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

.faq-list summary span {
  position: absolute;
  right: 5px;
  top: 22px;
  width: 29px;
  height: 29px;
  display: grid;
  place-items: center;
  color: var(--blue);
  border: 1px solid #c7d3e2;
  transition: transform 0.2s ease;
}

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

.faq-list details p {
  max-width: 760px;
  margin: -3px 0 24px;
  color: var(--muted);
}

.final-section {
  padding: 0 0 92px;
  background: var(--white);
}

.final-shell {
  min-height: 270px;
  display: grid;
  grid-template-columns: 1fr 230px;
  gap: 55px;
  align-items: center;
  padding: 55px 60px;
  color: var(--white);
  background:
    linear-gradient(115deg, rgba(11, 18, 32, 0.98), rgba(18, 48, 91, 0.96)),
    var(--navy);
}

.final-copy p {
  margin: 0 0 13px;
  color: var(--cyan);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.final-copy h2 {
  max-width: 770px;
  margin: 0;
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.final-copy span {
  display: block;
  margin-top: 18px;
  color: #9fb0c6;
  font-size: 12px;
}

.final-button {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
  color: var(--white);
  background: var(--blue);
  font-weight: 900;
  transition: transform 0.2s ease, background 0.2s ease;
}

.final-button:hover,
.final-button:focus-visible {
  transform: translateY(-3px);
  background: var(--blue-bright);
}

.final-button b {
  font-size: 23px;
}

.site-footer {
  padding: 56px 0 35px;
  color: #a3b2c7;
  background: #070d17;
}

.footer-shell {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 35px 60px;
  align-items: start;
}

.footer-brand p {
  max-width: 680px;
  margin: 17px 0 0;
  color: #728299;
  font-size: 12px;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, auto);
  gap: 8px 27px;
  font-size: 12px;
  font-weight: 760;
}

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

.copyright {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 23px;
  color: #546278;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-size: 11px;
}

.mobile-download {
  display: none;
}

@media (max-width: 1020px) {
  .header-shell {
    grid-template-columns: 190px 1fr 160px;
  }

  .site-nav {
    gap: 19px;
  }

  .installer-main {
    grid-template-columns: 230px 1fr;
  }

  .package-row {
    grid-template-columns: 65px 1fr 145px;
  }

  .intro-grid,
  .troubleshooting-grid,
  .version-layout,
  .faq-grid {
    gap: 48px;
  }
}

@media (max-width: 840px) {
  .header-shell {
    min-height: 70px;
    grid-template-columns: 1fr auto;
  }

  .brand img {
    height: 34px;
  }

  .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(--navy-2);
    border: 1px solid rgba(255, 255, 255, 0.13);
    box-shadow: 0 22px 55px rgba(0, 0, 0, 0.3);
  }

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

  .site-nav a {
    padding: 12px 13px;
  }

  .hero {
    padding: 78px 0 170px;
  }

  .hero-answer {
    grid-template-columns: 1fr;
    gap: 7px;
    text-align: center;
  }

  .installer-main {
    grid-template-columns: 1fr;
  }

  .installer-sidebar {
    display: none;
  }

  .intro-grid,
  .requirements-head,
  .troubleshooting-grid,
  .version-layout,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .trouble-heading,
  .faq-heading {
    position: static;
  }

  .requirements-head {
    gap: 22px;
  }

  .requirements-board article {
    grid-template-columns: 44px 1fr 0.8fr;
  }

  .requirements-board article > p {
    grid-column: 2 / -1;
  }

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

  .trouble-list article {
    grid-template-columns: 90px 1fr;
  }

  .trouble-list p {
    grid-column: 2;
  }

  .version-row {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .final-button {
    width: min(100%, 270px);
  }

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

  .copyright {
    grid-column: auto;
  }
}

@media (max-width: 600px) {
  .header-shell,
  .section-shell,
  .footer-shell,
  .final-shell,
  .hero-shell,
  .installer-wrap {
    width: min(calc(100% - 28px), var(--shell));
  }

  body {
    padding-bottom: 72px;
  }

  .hero {
    padding-top: 62px;
  }

  .hero h1 {
    font-size: clamp(42px, 13vw, 60px);
  }

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

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .installer-wrap {
    margin-top: -112px;
  }

  .window-bar {
    grid-template-columns: auto 1fr;
  }

  .window-bar p {
    text-align: right;
  }

  .window-bar small {
    display: none;
  }

  .installer-content {
    padding: 24px 17px 22px;
  }

  .installer-heading {
    display: block;
  }

  .installer-heading h2 {
    font-size: 24px;
  }

  .status {
    margin-top: 13px;
  }

  .package-row {
    grid-template-columns: 58px 1fr;
    gap: 14px;
    padding: 18px 15px;
  }

  .package-icon {
    width: 52px;
    height: 52px;
  }

  .package-copy h3 {
    font-size: 17px;
  }

  .package-action {
    grid-column: 1 / -1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
  }

  .package-action strong {
    margin: 0;
  }

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

  .section {
    padding: 68px 0;
  }

  .intro-heading h2,
  .requirements-head h2,
  .install-title h2,
  .trouble-heading h2,
  .version-layout h2,
  .faq-heading h2 {
    font-size: clamp(30px, 10vw, 40px);
  }

  .intro-lead {
    font-size: 19px;
  }

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

  .mode-switch {
    width: 100%;
  }

  .mode-switch button {
    flex: 1;
    min-width: 0;
  }

  .requirements-board article {
    grid-template-columns: 37px 1fr;
    gap: 10px;
    padding: 18px 15px;
  }

  .requirements-board article > strong,
  .requirements-board article > p {
    grid-column: 2;
  }

  .requirements-board article > strong {
    font-size: 17px;
  }

  .requirements-note {
    display: block;
  }

  .requirements-note b {
    display: block;
    margin-bottom: 5px;
  }

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

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

  .track-copy h3 {
    margin-top: 30px;
  }

  .install-download {
    display: grid;
  }

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

  .trouble-list article {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .trouble-list p {
    grid-column: auto;
  }

  .version-row {
    grid-template-columns: 1fr;
  }

  .version-row article {
    min-height: 0;
  }

  .version-row h3 {
    margin-top: 25px;
  }

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

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

  .final-shell {
    padding: 38px 24px;
  }

  .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;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 9px 14px;
    color: var(--white);
    background: rgba(7, 13, 23, 0.97);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(16px);
  }

  .mobile-download > div {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mobile-download img {
    width: 44px;
    height: 44px;
    border-radius: 11px;
  }

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

  .mobile-download small {
    color: #8091a7;
    font-size: 10px;
  }

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

  .mobile-download > a {
    flex: 0 0 auto;
    min-width: 74px;
    padding: 11px 14px;
    color: var(--white);
    background: var(--blue);
    text-align: center;
    font-size: 13px;
    font-weight: 900;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}