:root {
  color-scheme: light;
  --core-bg: #f6f7f4;
  --core-panel: #ffffff;
  --core-ink: #141716;
  --core-muted: #5a625f;
  --core-line: #dce1db;
  --core-soft: #ecefeb;
  --core-red: #c9161d;
  --core-blue: #1358bf;
  --core-green: #08765a;
  --core-yellow: #f1b93d;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--core-bg);
  color: var(--core-ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

html[lang="zh-CN"] body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

a {
  color: var(--core-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--core-line);
  background: rgba(246, 247, 244, 0.96);
  backdrop-filter: blur(16px);
}

nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--core-ink);
  font-weight: 850;
}

.brand img {
  width: 36px;
  height: 36px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 14px;
}

main {
  overflow: hidden;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: 72px;
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: 42px;
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: 0;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--core-red);
  font-size: 13px;
  font-weight: 850;
  text-transform: uppercase;
}

.lead {
  max-width: 770px;
  color: #323735;
  font-size: 21px;
}

.note {
  color: var(--core-muted);
}

.core-hero {
  position: relative;
  min-height: min(540px, calc(100vh - 145px));
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--core-line);
  background: var(--core-panel);
  isolation: isolate;
}

.core-hero-art {
  position: absolute;
  inset: 0 0 0 auto;
  z-index: -1;
  width: min(48%, 620px);
  height: 100%;
  object-fit: contain;
  object-position: right center;
  opacity: 0.08;
}

.core-hero-content {
  width: min(790px, 76%);
  padding: 72px 0 82px;
}

.hero-copy {
  margin-bottom: 28px;
}

.actions,
.inline-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #bfc6c1;
  border-radius: 6px;
  background: var(--core-panel);
  color: var(--core-ink);
  padding: 10px 15px;
  font: inherit;
  font-weight: 780;
  cursor: pointer;
}

.button:hover {
  border-color: #929b95;
  background: var(--core-soft);
  text-decoration: none;
}

.button.primary {
  border-color: var(--core-ink);
  background: var(--core-ink);
  color: #fff;
}

.button.primary:hover {
  background: #303533;
}

.button.accent {
  border-color: var(--core-red);
  background: var(--core-red);
  color: #fff;
}

.button.accent:hover {
  background: #aa1016;
}

.command-status {
  min-height: 22px;
  margin: 12px 0 0;
  color: var(--core-green);
  font-size: 14px;
  font-weight: 750;
}

.fact-band {
  border-bottom: 1px solid var(--core-line);
  background: var(--core-ink);
  color: #fff;
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.fact {
  min-width: 0;
  padding: 24px 22px;
  border-right: 1px solid #3b403e;
}

.fact:first-child {
  padding-left: 0;
}

.fact:last-child {
  border-right: 0;
}

.fact-label,
.label {
  display: block;
  margin-bottom: 7px;
  color: #aeb8b3;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.fact-value,
.value {
  display: block;
  overflow-wrap: anywhere;
  font-weight: 790;
}

.section {
  padding: 82px 0;
  border-bottom: 1px solid var(--core-line);
}

.section.soft {
  background: #e9edf3;
}

.section.warm {
  background: #f2ece9;
}

.section.dark {
  background: var(--core-ink);
  color: #fff;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-heading p:last-child {
  margin-bottom: 0;
  color: var(--core-muted);
  font-size: 18px;
}

.section.dark .section-heading p:last-child,
.section.dark .note {
  color: #bac3be;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.tool-card {
  min-height: 225px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--core-line);
  border-radius: 8px;
  background: var(--core-panel);
  padding: 23px;
}

.tool-card:nth-child(3n + 1) {
  border-top: 3px solid var(--core-red);
}

.tool-card:nth-child(3n + 2) {
  border-top: 3px solid var(--core-blue);
}

.tool-card:nth-child(3n) {
  border-top: 3px solid var(--core-green);
}

.tool-card p {
  color: var(--core-muted);
}

.tool-link {
  font-weight: 800;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  counter-reset: core-flow;
}

.step {
  min-height: 190px;
  padding: 0 25px;
  border-left: 1px solid #c5ccd4;
  counter-increment: core-flow;
}

.step:first-child {
  padding-left: 0;
  border-left: 0;
}

.step::before {
  display: block;
  margin-bottom: 22px;
  color: var(--core-blue);
  content: "0" counter(core-flow);
  font-size: 14px;
  font-weight: 900;
}

.step p {
  color: #4f5954;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 60px;
  align-items: start;
}

.detail-list,
.identity-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-list li,
.identity-row,
.live-row {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
  padding: 17px 0;
  border-bottom: 1px solid var(--core-line);
}

.section.dark .detail-list li {
  border-color: #3c423f;
}

.detail-list strong,
.identity-row strong,
.live-row strong {
  min-width: 0;
  overflow-wrap: anywhere;
  text-align: right;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.boundary-item {
  border-top: 3px solid var(--core-yellow);
  padding-top: 18px;
}

.boundary-item p {
  margin-bottom: 0;
  color: #bac3be;
}

.live-check {
  border-left: 4px solid var(--core-green);
  padding-left: 22px;
}

.live-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.live-summary {
  margin: 18px 0 4px;
  border: 1px solid var(--core-line);
  border-radius: 6px;
  background: var(--core-soft);
  padding: 12px 14px;
  font-weight: 800;
}

.live-summary.good {
  border-color: #a9dbc9;
  background: #f0faf6;
  color: #086447;
}

.live-summary.bad {
  border-color: #f0b5ae;
  background: #fff4f2;
  color: #9d201a;
}

.live-row {
  grid-template-columns: minmax(150px, 0.7fr) minmax(0, 1.3fr);
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.channel {
  min-height: 145px;
  border: 1px solid var(--core-line);
  border-radius: 8px;
  background: var(--core-panel);
  padding: 20px;
}

.channel strong,
.channel a {
  display: block;
  overflow-wrap: anywhere;
}

.channel strong {
  margin-bottom: 8px;
}

.safety-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 34px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.safety-list li {
  border-top: 3px solid var(--core-red);
  padding-top: 18px;
}

.final-cta {
  padding: 66px 0;
  background: var(--core-yellow);
}

.final-cta .split {
  align-items: center;
}

.final-cta h2 {
  margin-bottom: 0;
}

.final-cta .actions {
  justify-content: flex-end;
}

footer {
  padding: 42px 0;
  background: var(--core-ink);
  color: #c3cbc7;
}

.footer-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-line strong {
  color: #fff;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a {
  color: #dbe1de;
}

@media (max-width: 900px) {
  h1 {
    font-size: 56px;
  }

  h2 {
    font-size: 36px;
  }

  .core-hero-content {
    width: 88%;
  }

  .facts,
  .steps,
  .boundary-grid,
  .channel-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .fact:nth-child(2) {
    border-right: 0;
  }

  .fact:nth-child(n + 3) {
    border-top: 1px solid #3b403e;
  }

  .fact:nth-child(3) {
    padding-left: 0;
  }

  .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .step:nth-child(3) {
    padding-left: 0;
    border-left: 0;
  }

  .step:nth-child(n + 3) {
    margin-top: 34px;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .final-cta .actions {
    justify-content: flex-start;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(100% - 28px, 1160px);
  }

  h1 {
    font-size: 44px;
  }

  h2 {
    font-size: 31px;
  }

  .lead {
    font-size: 18px;
  }

  .core-hero {
    min-height: 560px;
  }

  .core-hero-art {
    width: 100%;
    opacity: 0.055;
  }

  .core-hero-content {
    width: 100%;
    padding: 58px 0 66px;
  }

  .actions .button {
    width: 100%;
  }

  .facts,
  .tool-grid,
  .steps,
  .boundary-grid,
  .channel-grid,
  .safety-list {
    grid-template-columns: 1fr;
  }

  .fact,
  .fact:first-child,
  .fact:nth-child(3) {
    padding: 19px 0;
    border-top: 1px solid #3b403e;
    border-right: 0;
  }

  .fact:first-child {
    border-top: 0;
  }

  .section {
    padding: 62px 0;
  }

  .step,
  .step:first-child,
  .step:nth-child(3) {
    min-height: 0;
    margin-top: 0;
    padding: 25px 0;
    border-top: 1px solid #c5ccd4;
    border-left: 0;
  }

  .step:first-child {
    padding-top: 0;
    border-top: 0;
  }

  .detail-list li,
  .identity-row,
  .live-row {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .detail-list strong,
  .identity-row strong,
  .live-row strong {
    text-align: left;
  }

  .live-header,
  .footer-line {
    align-items: stretch;
    flex-direction: column;
  }

  .live-header .button {
    width: 100%;
  }

  .final-cta {
    padding: 52px 0;
  }
}

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