:root {
  color: #172026;
  background: #f4f2ed;
  font-family:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(#d8d3c8 1px, transparent 1px),
    linear-gradient(90deg, #d8d3c8 1px, transparent 1px),
    #f4f2ed;
  background-size: 32px 32px;
}

body,
button {
  font: inherit;
}

a {
  color: inherit;
}

code {
  border: 1px solid #c8c0b4;
  border-radius: 5px;
  background: #fffaf0;
  color: #1d2a30;
  padding: 2px 5px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
  overflow-wrap: anywhere;
}

[hidden] {
  display: none !important;
}

html[lang="en"] [data-locale="zh"],
html[lang="zh"] [data-locale="en"] {
  display: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr) max-content;
  align-items: center;
  gap: 24px;
  min-height: 64px;
  border-bottom: 1px solid #c7beb0;
  background: rgba(244, 242, 237, 0.94);
  padding: 0 28px;
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 780;
  text-decoration: none;
}

.brand-lamp,
.lamp {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: #2aa95f;
  box-shadow: 0 0 0 4px rgba(42, 169, 95, 0.16);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.site-nav a,
.locale-switch button,
.primary-link,
.secondary-link,
.text-link {
  min-height: 36px;
  border-radius: 6px;
  text-decoration: none;
}

.site-nav a,
.locale-switch button {
  display: inline-flex;
  align-items: center;
  border: 1px solid transparent;
  background: transparent;
  color: #4b555b;
  padding: 0 10px;
  cursor: pointer;
}

.site-nav a:hover,
.locale-switch button:hover,
.locale-switch button[aria-pressed="true"] {
  border-color: #b6aa9c;
  background: #fffaf0;
  color: #172026;
}

.locale-switch {
  display: inline-flex;
  gap: 4px;
}

.hero,
.section-band,
.state-board,
.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: 48px;
  min-height: calc(100svh - 132px);
  align-items: center;
  padding: 72px 0 48px;
}

.section-label {
  margin: 0 0 10px;
  color: #69736f;
  font-size: 0.78rem;
  font-weight: 760;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  max-width: 12ch;
  font-size: clamp(3rem, 8vw, 6.7rem);
  line-height: 0.96;
  font-weight: 820;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 1.08;
}

.hero-subtitle {
  max-width: 650px;
  margin-top: 22px;
  color: #3f4c53;
  font-size: clamp(1.05rem, 2vw, 1.5rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.primary-link,
.secondary-link,
.text-link {
  display: inline-flex;
  align-items: center;
  border: 1px solid #172026;
  padding: 0 14px;
  font-weight: 720;
}

.primary-link {
  background: #172026;
  color: #f7f3ea;
}

.secondary-link {
  background: #fffaf0;
}

.text-link {
  border-color: transparent;
  color: #27623f;
  padding: 0 4px;
}

.hero-system {
  border: 1px solid #b9afa0;
  border-radius: 8px;
  background: rgba(255, 250, 240, 0.88);
  padding: 22px;
}

.signal-chain {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.signal-chain li {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(0, 1.35fr);
  align-items: center;
  gap: 12px;
  min-height: 54px;
  border: 1px solid #d2c7b7;
  border-radius: 6px;
  background: #fbf8f0;
  padding: 12px;
}

.state-board {
  border-top: 1px solid #b9afa0;
  padding: 40px 0;
}

.state-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.state-item,
.download-layout,
.firmware-panel,
.buy-panel,
.doc-grid a {
  border: 1px solid #c8c0b4;
  border-radius: 8px;
  background: rgba(255, 250, 240, 0.92);
}

.state-item {
  display: grid;
  gap: 8px;
  min-height: 180px;
  padding: 16px;
}

.state-item[data-tone="yellow"] .lamp {
  background: #e5ad32;
  box-shadow: 0 0 0 4px rgba(229, 173, 50, 0.18);
}

.state-item[data-tone="red"] .lamp {
  background: #ce4038;
  box-shadow: 0 0 0 4px rgba(206, 64, 56, 0.16);
}

.state-item p,
.section-copy p,
.buy-panel p,
.muted,
.debug-list {
  color: #4d5b61;
}

.section-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  gap: 28px;
  border-top: 1px solid #b9afa0;
  padding: 54px 0;
}

.section-copy {
  display: grid;
  align-content: start;
  gap: 12px;
}

.download-layout,
.firmware-panel,
.buy-panel {
  display: grid;
  gap: 16px;
  padding: 22px;
}

.artifact-list,
.download-grid,
.debug-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.artifact-list li {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.download-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.download-grid .primary-link {
  display: grid;
  align-content: center;
  gap: 6px;
  min-height: 86px;
}

.download-grid code {
  border-color: rgba(247, 243, 234, 0.26);
  background: rgba(247, 243, 234, 0.09);
  color: #f7f3ea;
}

.setup-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.setup-steps li {
  min-height: 180px;
  border-top: 3px solid #172026;
  background: rgba(255, 250, 240, 0.72);
  padding: 16px 0 0;
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border: 1px solid #172026;
  border-radius: 999px;
  font-weight: 800;
}

.buy-band {
  display: block;
}

.buy-panel {
  max-width: 760px;
}

.coming-soon {
  display: inline-flex;
  width: max-content;
  min-height: 32px;
  align-items: center;
  border: 1px solid #a78a32;
  border-radius: 999px;
  background: #fff4c4;
  color: #5f4b11;
  padding: 0 12px;
  font-weight: 780;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.doc-grid a {
  display: grid;
  gap: 8px;
  min-height: 96px;
  padding: 16px;
  text-decoration: none;
}

.doc-grid span {
  color: #69736f;
  overflow-wrap: anywhere;
}

.debug-band {
  grid-template-columns: minmax(0, 0.8fr) minmax(360px, 1.2fr);
}

.debug-list li {
  border-left: 3px solid #172026;
  background: rgba(255, 250, 240, 0.72);
  padding: 10px 12px;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid #b9afa0;
  padding: 28px 0 40px;
  color: #69736f;
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 14px 20px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero,
  .section-band,
  .debug-band {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 48px;
  }

  .state-grid,
  .setup-steps,
  .download-grid,
  .doc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .hero,
  .section-band,
  .state-board,
  .site-footer {
    width: min(100% - 28px, 1180px);
  }

  h1 {
    font-size: clamp(2.6rem, 17vw, 4.3rem);
  }

  .state-grid,
  .setup-steps,
  .download-grid,
  .doc-grid {
    grid-template-columns: 1fr;
  }

  .artifact-list li,
  .signal-chain li {
    grid-template-columns: 1fr;
  }
}