:root {
  --black: #080b0d;
  --black-soft: #101519;
  --green: #90f230;
  --green-deep: #5dae15;
  --blue: #8dd8f7;
  --blue-deep: #1b526b;
  --silver: #b7c0c6;
  --silver-pale: #e7ebed;
  --white: #f8faf8;
  --paper: #f1f4f1;
  --text: #14191c;
  --muted: #626b70;
  --line: rgba(20, 25, 28, 0.18);
  --page: min(100% - 72px, 1540px);
  --header-height: 82px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

p,
h1,
h2,
h3,
dl,
dd {
  margin: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
}

::selection {
  color: var(--black);
  background: var(--green);
}

.skip-nav {
  position: absolute;
  z-index: 120;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 120;
  padding: 10px 14px;
  color: var(--black);
  background: var(--green);
  text-decoration: none;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--white);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: grid;
  grid-template-columns: 290px 1fr;
  min-height: var(--header-height);
  color: var(--white);
  background: rgba(8, 11, 13, 0.97);
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  backdrop-filter: blur(14px);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 0 34px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

.header-brand img {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.header-brand > span {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.header-brand small {
  color: rgba(255, 255, 255, 0.43);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.15em;
}

.site-nav {
  display: flex;
  justify-content: flex-end;
  align-items: stretch;
  padding-right: max(20px, calc((100vw - 1540px) / 2));
}

.site-nav a {
  position: relative;
  display: flex;
  align-items: center;
  padding: 0 18px;
  color: rgba(255, 255, 255, 0.65);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 180ms ease, background-color 180ms ease;
}

.site-nav a::before {
  position: absolute;
  right: 18px;
  bottom: 0;
  left: 18px;
  height: 3px;
  background: var(--green);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  color: var(--white);
  background: rgba(255, 255, 255, 0.035);
}

.site-nav a:hover::before,
.site-nav a:focus-visible::before,
.site-nav a[aria-current="page"]::before {
  transform: scaleX(1);
}

.site-nav a:focus-visible,
.menu-toggle:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: -4px;
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: 13px;
  justify-self: end;
  margin-right: 24px;
  padding: 13px 0 13px 14px;
  color: var(--white);
  background: transparent;
  border: 0;
  cursor: pointer;
}

.menu-toggle span {
  font-size: 10px;
  letter-spacing: 0.18em;
}

.menu-toggle i {
  position: relative;
  display: block;
  width: 30px;
  height: 1px;
  background: currentColor;
}

.menu-toggle i::after {
  position: absolute;
  top: 7px;
  right: 0;
  width: 20px;
  height: 1px;
  background: currentColor;
  content: "";
  transition: width 180ms ease, transform 180ms ease;
}

.menu-toggle[aria-expanded="true"] i {
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] i::after {
  top: 0;
  width: 30px;
  transform: rotate(90deg);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(420px, 0.92fr);
  min-height: calc(100svh - var(--header-height));
  overflow: hidden;
  color: var(--white);
  background: var(--black);
}

.hero-copy {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(64px, 7vw, 122px) clamp(36px, 7vw, 120px);
  background:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    radial-gradient(circle at 18% 28%, rgba(144, 242, 48, 0.1), transparent 30%),
    var(--black);
  background-size: 92px 92px, 92px 92px, auto, auto;
}

.micro-label {
  color: var(--green);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.23em;
  line-height: 1.4;
}

.micro-label.dark {
  color: var(--green-deep);
}

.hero-logo {
  margin-top: 18px;
  color: var(--green);
  font-size: clamp(130px, 18vw, 300px);
  font-weight: 950;
  letter-spacing: -0.115em;
  line-height: 0.78;
}

.hero h1 {
  max-width: 760px;
  margin-top: 46px;
  font-size: clamp(27px, 3vw, 50px);
  font-weight: 760;
  letter-spacing: -0.035em;
  line-height: 1.25;
}

.hero-tagline {
  max-width: 710px;
  margin-top: 24px;
  color: var(--blue);
  font-size: clamp(20px, 2vw, 31px);
  font-weight: 520;
  line-height: 1.5;
}

.hero-intro {
  max-width: 650px;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.56);
  font-size: 14px;
}

.hero-visual {
  position: relative;
  min-height: 700px;
  overflow: hidden;
  background: #171e22;
}

.hero-visual::before {
  position: absolute;
  inset: 24px;
  z-index: 3;
  border: 1px solid rgba(255, 255, 255, 0.24);
  content: "";
  pointer-events: none;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: grayscale(0.62) contrast(1.12) brightness(0.62);
}

.hero-visual-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(140deg, rgba(8, 11, 13, 0.02) 40%, rgba(8, 11, 13, 0.92)),
    linear-gradient(0deg, rgba(27, 82, 107, 0.55), transparent 52%);
  mix-blend-mode: multiply;
}

.visual-code {
  position: absolute;
  right: 48px;
  bottom: 44px;
  z-index: 4;
  color: rgba(255, 255, 255, 0.66);
  font-size: 9px;
  letter-spacing: 0.3em;
}

.hero-rail {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 8;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  min-height: 92px;
  padding-left: max(0px, calc((100vw - 1540px) / 2));
  color: var(--white);
  background: rgba(8, 11, 13, 0.91);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(12px);
}

.hero-rail > div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 17px 28px;
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-rail span {
  color: rgba(255, 255, 255, 0.4);
  font-size: 9px;
  letter-spacing: 0.16em;
}

.hero-rail strong {
  margin-top: 6px;
  font-size: 13px;
  font-weight: 520;
  letter-spacing: 0.03em;
}

.breadcrumb {
  display: flex;
  gap: 12px;
  width: var(--page);
  margin: 0 auto;
  padding: 22px 0;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  font-size: 11px;
}

.section {
  width: var(--page);
  margin: 0 auto;
  padding: clamp(90px, 10vw, 166px) 0;
}

.section + .section,
.section + .feature-system,
.feature-system + .guide,
.guide + .responsible,
.responsible + .help,
.help + .source-policy {
  border-top: 1px solid var(--line);
}

.section-index {
  color: var(--green-deep);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.16em;
}

.platform {
  display: grid;
  grid-template-columns: 86px minmax(340px, 0.78fr) 1.22fr;
  gap: clamp(28px, 5vw, 90px);
  align-items: start;
}

.platform-title h2 {
  margin-top: 23px;
  font-size: clamp(48px, 6vw, 94px);
  font-weight: 780;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

.platform-copy {
  padding-top: 48px;
}

.platform-copy .lead {
  max-width: 780px;
  font-size: clamp(21px, 2vw, 30px);
  font-weight: 580;
  line-height: 1.62;
}

.platform-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 34px;
  margin-top: 54px;
  padding-top: 30px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.world {
  width: 100%;
  padding: clamp(92px, 10vw, 164px) max(36px, calc((100vw - 1540px) / 2));
  color: var(--white);
  background: var(--black-soft);
}

.world-header {
  display: grid;
  grid-template-columns: 1fr 0.84fr;
  gap: clamp(50px, 11vw, 180px);
  align-items: end;
}

.world-header h2,
.intelligence-title h2,
.guide-main h2,
.profile-brand h2 {
  margin-top: 24px;
  font-size: clamp(48px, 6vw, 96px);
  font-weight: 780;
  letter-spacing: -0.065em;
  line-height: 1;
}

.world-header > p {
  max-width: 650px;
  color: rgba(255, 255, 255, 0.56);
}

.world-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 78px;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  border-left: 1px solid rgba(255, 255, 255, 0.25);
}

.world-grid article {
  position: relative;
  min-height: 420px;
  padding: 30px;
  overflow: hidden;
  border-right: 1px solid rgba(255, 255, 255, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
}

.world-grid article::after {
  position: absolute;
  right: -35px;
  bottom: -82px;
  width: 190px;
  height: 190px;
  background: var(--green);
  content: "";
  opacity: 0;
  transform: rotate(45deg) translateY(55px);
  transition: opacity 220ms ease, transform 220ms ease;
}

.world-grid article:hover::after {
  opacity: 0.08;
  transform: rotate(45deg) translateY(0);
}

.world-no {
  display: block;
  color: var(--green);
  font-size: 53px;
  font-weight: 900;
  line-height: 1;
}

.world-en {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.38);
  font-size: 9px;
  letter-spacing: 0.2em;
}

.world-grid h3 {
  margin-top: 104px;
  font-size: clamp(21px, 2vw, 29px);
  font-weight: 620;
  line-height: 1.4;
}

.world-grid article > p:last-child {
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.52);
  font-size: 13px;
}

.discovery-index {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin-top: 38px;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
  border-bottom: 1px solid rgba(255, 255, 255, 0.24);
}

.discovery-index article {
  min-height: 190px;
  padding: 24px 22px;
}

.discovery-index article + article {
  border-left: 1px solid rgba(255, 255, 255, 0.24);
}

.discovery-index span {
  color: var(--green);
  font-size: 10px;
  font-weight: 750;
}

.discovery-index h3 {
  margin-top: 34px;
  font-size: 18px;
  font-weight: 620;
}

.discovery-index p {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 12px;
}

.world-note {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  margin-top: 38px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
}

.world-note span {
  color: var(--blue);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.world-note p {
  max-width: 970px;
  color: rgba(255, 255, 255, 0.56);
}

.featured {
  display: grid;
  grid-template-columns: minmax(350px, 0.78fr) 1.22fr;
  gap: clamp(60px, 10vw, 170px);
}

.featured-copy {
  align-self: start;
}

.featured-copy h2,
.feature-system-head h2,
.responsible h2,
.help-heading h2,
.source-policy h2 {
  margin-top: 24px;
  font-size: clamp(44px, 5.3vw, 82px);
  font-weight: 780;
  letter-spacing: -0.06em;
  line-height: 1.06;
}

.featured-copy > p:last-child {
  max-width: 560px;
  margin-top: 36px;
  color: var(--muted);
}

.release-board {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  min-height: 560px;
  color: var(--white);
  background: var(--black);
}

.release-word {
  display: flex;
  align-items: flex-end;
  padding: 42px 36px;
  color: var(--green);
  background:
    linear-gradient(135deg, transparent 49.6%, rgba(144, 242, 48, 0.22) 50%, transparent 50.4%),
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
  font-size: clamp(46px, 5vw, 78px);
  font-weight: 900;
  letter-spacing: -0.075em;
  line-height: 0.88;
}

.release-board dl {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 34px;
}

.release-board dl > div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
  padding: 17px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.release-board dl > div:last-child {
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.release-board dt {
  color: rgba(255, 255, 255, 0.42);
  font-size: 11px;
}

.release-board dd {
  font-size: 14px;
}

.attention-band {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: clamp(60px, 10vw, 170px);
  padding-top: 34px;
  border-top: 1px solid var(--text);
}

.attention-band h3 {
  font-size: 22px;
  font-weight: 650;
}

.attention-band p {
  color: var(--muted);
}

.intelligence {
  display: grid;
  grid-template-columns: 0.76fr 1.24fr;
  gap: clamp(55px, 10vw, 170px);
  padding: clamp(92px, 10vw, 164px) max(36px, calc((100vw - 1540px) / 2));
  color: var(--white);
  background: var(--blue-deep);
}

.intelligence-title {
  align-self: start;
}

.intelligence-title > p:last-child {
  max-width: 520px;
  margin-top: 34px;
  color: rgba(255, 255, 255, 0.6);
}

.intel-list {
  border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.intel-list article {
  display: grid;
  grid-template-columns: 120px 1fr 90px;
  gap: 30px;
  padding: 30px 0 34px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.intel-list time,
.intel-list article > span {
  color: var(--blue);
  font-size: 10px;
  letter-spacing: 0.09em;
}

.intel-list article > span {
  text-align: right;
}

.intel-list h3 {
  font-size: clamp(20px, 2vw, 28px);
  font-weight: 620;
  line-height: 1.42;
}

.intel-list p {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 13px;
}

.feature-system {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(60px, 10vw, 170px);
  width: var(--page);
  margin: 0 auto;
  padding: clamp(90px, 10vw, 160px) 0;
}

.feature-lines {
  border-top: 1px solid var(--text);
}

.feature-lines article {
  display: grid;
  grid-template-columns: 55px 0.75fr 1.25fr;
  gap: 26px;
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--line);
}

.feature-lines span {
  color: var(--green-deep);
  font-size: 11px;
  font-weight: 750;
}

.feature-lines h3 {
  font-size: 22px;
  font-weight: 620;
}

.feature-lines p {
  color: var(--muted);
  font-size: 14px;
}

.guide {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(60px, 10vw, 170px);
  padding: clamp(92px, 10vw, 164px) max(36px, calc((100vw - 1540px) / 2));
  color: var(--white);
  background: var(--black);
}

.guide-main > p:last-child {
  max-width: 560px;
  margin-top: 36px;
  color: rgba(255, 255, 255, 0.57);
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  border-left: 1px solid rgba(255, 255, 255, 0.25);
}

.device-grid article {
  min-height: 292px;
  padding: 29px;
  border-right: 1px solid rgba(255, 255, 255, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
}

.device-code {
  color: var(--green);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.device-grid h3 {
  margin-top: 58px;
  font-size: 23px;
  font-weight: 620;
}

.device-grid p {
  margin-top: 15px;
  color: rgba(255, 255, 255, 0.54);
  font-size: 13px;
}

.responsible {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(60px, 10vw, 170px);
  width: var(--page);
  margin: 0 auto;
  padding: clamp(84px, 9vw, 140px) 0;
}

.responsible-copy {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 34px;
  padding-top: 30px;
  color: var(--muted);
  border-top: 1px solid var(--text);
}

.help {
  display: grid;
  grid-template-columns: 0.64fr 1.36fr;
  gap: clamp(60px, 10vw, 170px);
  width: var(--page);
  margin: 0 auto;
  padding: clamp(90px, 10vw, 160px) 0;
}

.help-heading {
  position: sticky;
  top: calc(var(--header-height) + 46px);
  align-self: start;
}

.help-heading > p:last-child {
  max-width: 420px;
  margin-top: 28px;
  color: var(--muted);
}

.faq-list {
  counter-reset: faq;
  border-top: 1px solid var(--text);
}

.faq-list article {
  position: relative;
  padding: 28px 0 32px 58px;
  border-bottom: 1px solid var(--line);
  counter-increment: faq;
}

.faq-list article::before {
  position: absolute;
  top: 32px;
  left: 0;
  color: var(--green-deep);
  content: counter(faq, decimal-leading-zero);
  font-size: 11px;
  font-weight: 780;
}

.faq-list h3 {
  font-size: 21px;
  font-weight: 650;
}

.faq-list p {
  max-width: 820px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.source-policy {
  width: var(--page);
  margin: 0 auto;
  padding: clamp(88px, 9vw, 144px) 0;
}

.source-policy h2 {
  max-width: 720px;
}

.policy-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 62px;
  border-top: 1px solid var(--text);
}

.policy-grid article {
  min-height: 240px;
  padding: 26px 24px 28px 0;
  border-bottom: 1px solid var(--text);
}

.policy-grid article + article {
  padding-left: 24px;
  border-left: 1px solid var(--text);
}

.policy-grid span {
  color: var(--green-deep);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.1em;
}

.policy-grid p {
  margin-top: 78px;
  color: var(--muted);
  font-size: 14px;
}

.profile {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(60px, 10vw, 170px);
  padding: clamp(94px, 10vw, 165px) max(36px, calc((100vw - 1540px) / 2));
  color: var(--white);
  background: var(--blue-deep);
}

.profile-brand img {
  width: 64px;
  height: 64px;
  margin-bottom: 50px;
  object-fit: contain;
}

.profile-brand > p:last-child {
  max-width: 480px;
  margin-top: 30px;
  color: rgba(255, 255, 255, 0.57);
}

.profile-list {
  border-top: 1px solid rgba(255, 255, 255, 0.28);
}

.profile-list > div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.28);
}

.profile-list dt {
  color: var(--blue);
  font-size: 11px;
}

.profile-list dd {
  font-size: 15px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  padding: 42px max(36px, calc((100vw - 1540px) / 2));
  color: var(--white);
  background: #050708;
  border-top: 1px solid rgba(255, 255, 255, 0.13);
}

.site-footer > div:first-child {
  display: flex;
  align-items: flex-end;
  gap: 18px;
}

.site-footer strong {
  color: var(--green);
  font-size: 50px;
  font-weight: 950;
  letter-spacing: -0.08em;
  line-height: 0.8;
}

.site-footer span,
.footer-copy {
  color: rgba(255, 255, 255, 0.42);
  font-size: 9px;
  letter-spacing: 0.13em;
}

.footer-copy {
  text-align: right;
}

.footer-copy p + p {
  margin-top: 4px;
}

@media (max-width: 1180px) {
  :root {
    --page: min(100% - 48px, 1540px);
  }

  .site-header {
    grid-template-columns: 260px 1fr auto;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    padding: 12px 24px 20px;
    background: rgba(8, 11, 13, 0.99);
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .site-nav a {
    min-height: 48px;
    padding: 0 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .site-nav a::before {
    right: 12px;
    left: 12px;
  }

  .js .site-nav {
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: visibility 180ms ease, opacity 180ms ease, transform 180ms ease;
  }

  .js .site-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .hero {
    grid-template-columns: 1fr 0.82fr;
  }

  .hero-copy {
    padding-right: 46px;
    padding-left: 46px;
  }

  .platform {
    grid-template-columns: 60px 0.82fr 1.18fr;
    gap: 36px;
  }

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

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

  .discovery-index article:nth-child(4) {
    border-left: 0;
  }

  .discovery-index article:nth-child(n + 4) {
    border-top: 1px solid rgba(255, 255, 255, 0.24);
  }

  .world-grid article {
    min-height: 330px;
  }

  .world-grid h3 {
    margin-top: 60px;
  }

  .featured,
  .intelligence,
  .feature-system,
  .guide,
  .responsible,
  .help,
  .profile {
    gap: 70px;
  }
}

@media (max-width: 880px) {
  :root {
    --header-height: 74px;
    --page: calc(100% - 40px);
  }

  .site-header {
    grid-template-columns: 1fr auto;
  }

  .header-brand {
    border-right: 0;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-bottom: 0;
  }

  .hero-copy {
    min-height: 680px;
    padding-bottom: 150px;
  }

  .hero-visual {
    min-height: 480px;
  }

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

  .hero-rail > div {
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .platform {
    grid-template-columns: 50px 1fr;
  }

  .platform-copy {
    grid-column: 2;
    padding-top: 12px;
  }

  .world-header,
  .featured,
  .intelligence,
  .feature-system,
  .guide,
  .responsible,
  .help,
  .profile {
    grid-template-columns: 1fr;
  }

  .featured-copy,
  .help-heading {
    position: static;
  }

  .attention-band {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .intel-list article {
    grid-template-columns: 100px 1fr 78px;
    gap: 18px;
  }

  .feature-lines article {
    grid-template-columns: 46px 0.8fr 1.2fr;
    gap: 18px;
  }

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

  .policy-grid article:nth-child(3) {
    border-left: 0;
  }
}

@media (max-width: 620px) {
  :root {
    --page: calc(100% - 32px);
  }

  body {
    font-size: 15px;
  }

  .header-brand {
    padding: 0 16px;
  }

  .header-brand small {
    display: none;
  }

  .menu-toggle {
    margin-right: 16px;
  }

  .site-nav {
    grid-template-columns: 1fr;
    max-height: calc(100vh - var(--header-height));
    padding-right: 16px;
    padding-left: 16px;
    overflow-y: auto;
  }

  .hero-copy {
    min-height: 620px;
    padding: 62px 20px 170px;
  }

  .hero-logo {
    font-size: 43vw;
  }

  .hero h1 {
    margin-top: 38px;
    font-size: 27px;
  }

  .hero-tagline {
    font-size: 20px;
  }

  .hero-intro {
    font-size: 13px;
  }

  .hero-visual {
    min-height: 340px;
  }

  .hero-visual::before {
    inset: 14px;
  }

  .visual-code {
    right: 26px;
    bottom: 24px;
  }

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

  .hero-rail > div {
    min-height: 66px;
    padding: 12px 20px;
  }

  .section,
  .feature-system,
  .responsible,
  .help,
  .source-policy {
    padding: 82px 0;
  }

  .world,
  .intelligence,
  .guide,
  .profile {
    padding: 82px 16px;
  }

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

  .platform-copy {
    grid-column: 1;
  }

  .platform-columns,
  .responsible-copy {
    grid-template-columns: 1fr;
  }

  .world-grid,
  .device-grid,
  .discovery-index {
    grid-template-columns: 1fr;
  }

  .discovery-index article {
    min-height: 0;
    padding: 22px 0;
  }

  .discovery-index article + article,
  .discovery-index article:nth-child(4) {
    border-top: 1px solid rgba(255, 255, 255, 0.24);
    border-left: 0;
  }

  .discovery-index h3 {
    margin-top: 18px;
  }

  .world-grid article {
    min-height: 300px;
  }

  .world-note {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .release-board {
    grid-template-columns: 1fr;
  }

  .release-word {
    min-height: 340px;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .intel-list article {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .intel-list article > span {
    text-align: left;
  }

  .feature-lines article {
    grid-template-columns: 38px 1fr;
  }

  .feature-lines p {
    grid-column: 2;
  }

  .device-grid article {
    min-height: 250px;
  }

  .faq-list article {
    padding-left: 42px;
  }

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

  .policy-grid article + article {
    padding-left: 0;
    border-left: 0;
  }

  .policy-grid p {
    margin-top: 44px;
  }

  .profile-list > div {
    grid-template-columns: 105px 1fr;
    gap: 18px;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    padding: 38px 16px;
  }

  .footer-copy {
    text-align: left;
  }
}

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

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