:root {
  color-scheme: light;
  --paper: #f4f1e9;
  --paper-deep: #e8e2d4;
  --panel: #fffdf6;
  --ink: #101820;
  --muted: #667069;
  --line: #d7d0c2;
  --grid: rgba(16, 24, 32, 0.075);
  --grid-strong: rgba(16, 24, 32, 0.18);
  --green: #009b78;
  --green-deep: #006f5c;
  --orange: #e66b2a;
  --blueprint: #172336;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    radial-gradient(circle at 78% 12%, rgba(0, 155, 120, 0.18), transparent 32rem),
    radial-gradient(circle at 8% 80%, rgba(230, 107, 42, 0.13), transparent 28rem),
    var(--paper);
  background-size: 34px 34px, 34px 34px, auto, auto, auto;
  color: var(--ink);
  font-family:
    "Avenir Next Condensed", "DIN Condensed", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

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

.grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.36;
  background-image: radial-gradient(rgba(16, 24, 32, 0.18) 0.7px, transparent 0.7px);
  background-size: 4px 4px;
}

.shell {
  min-height: 100vh;
  overflow: hidden;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 241, 233, 0.86);
  padding: 1rem clamp(1rem, 4vw, 5rem);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-icon {
  display: grid;
  width: 3rem;
  height: 3rem;
  place-items: center;
  border: 1px solid rgba(0, 155, 120, 0.36);
  border-radius: 0.75rem;
  background: rgba(0, 155, 120, 0.1);
  color: var(--green);
}

.brand-icon svg {
  width: 1.65rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.2;
}

.brand strong {
  display: block;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.brand small {
  display: block;
  margin-top: 0.08rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.topbar nav {
  display: flex;
  gap: 1.4rem;
  color: var(--muted);
  font-weight: 800;
}

.topbar nav a:hover {
  color: var(--green-deep);
}

.hero {
  display: grid;
  grid-template-columns: minmax(22rem, 0.86fr) minmax(34rem, 1.14fr);
  gap: clamp(2rem, 5vw, 5.5rem);
  align-items: center;
  padding: clamp(3.4rem, 6vw, 6rem) clamp(1rem, 4vw, 5rem) 4rem;
}

.eyebrow,
.section-head p {
  margin: 0 0 0.9rem;
  color: var(--green-deep);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 10em;
  margin-bottom: 1.35rem;
  font-size: clamp(3.15rem, 4.7vw, 5.3rem);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 0.96;
}

.lead {
  max-width: 42rem;
  color: var(--muted);
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 1.03rem;
  line-height: 1.9;
}

.recommend-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: center;
  margin: 2rem 0 1.1rem;
  border: 1px solid rgba(0, 155, 120, 0.32);
  border-left: 0.35rem solid var(--green);
  background: rgba(255, 253, 246, 0.8);
  box-shadow: 0 1.4rem 3rem rgba(16, 24, 32, 0.08);
  padding: 1.15rem;
}

.label,
.package-card span {
  color: var(--green-deep);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.recommend-card h2 {
  margin: 0.32rem 0 0.35rem;
  font-size: 1.45rem;
}

.recommend-card p {
  margin: 0;
  color: var(--muted);
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

.download-button,
.package-card a,
.package-card button {
  display: inline-flex;
  min-height: 3.15rem;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 0.45rem;
  background: var(--green);
  box-shadow: 0 1rem 2rem rgba(0, 155, 120, 0.24);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  padding: 0 1.2rem;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease;
  white-space: nowrap;
}

.download-button:hover,
.package-card a:hover {
  background: var(--green-deep);
  box-shadow: 0 1.2rem 2.4rem rgba(0, 111, 92, 0.25);
  transform: translateY(-2px);
}

.release-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: rgba(255, 253, 246, 0.68);
}

.release-meta div {
  padding: 0.95rem 1rem;
}

.release-meta div + div {
  border-left: 1px solid var(--line);
}

.release-meta dt {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
}

.release-meta dd {
  margin: 0.28rem 0 0;
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
}

.product-visual {
  transform: rotate(-1.1deg);
}

.window {
  overflow: hidden;
  border: 1px solid rgba(16, 24, 32, 0.18);
  border-radius: 1.05rem;
  background: var(--panel);
  box-shadow: 0 2rem 5rem rgba(16, 24, 32, 0.18);
}

.traffic {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 1rem;
}

.traffic span {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
}

.traffic span:nth-child(1) {
  background: #ff5f57;
}

.traffic span:nth-child(2) {
  background: #ffbd2e;
}

.traffic span:nth-child(3) {
  background: #28c840;
}

.traffic b {
  margin-left: 0.7rem;
  color: var(--muted);
}

.cad-ui {
  display: grid;
  grid-template-columns: 4.4rem 1fr 10rem;
  min-height: 33rem;
}

.rail,
.inspector {
  background: rgba(244, 241, 233, 0.72);
  padding: 1rem;
}

.rail {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  align-content: start;
  gap: 0.72rem;
  border-right: 1px solid var(--line);
}

.rail i {
  width: 1.05rem;
  height: 1.05rem;
  border: 2px solid var(--ink);
  border-radius: 0.18rem;
}

.rail i:nth-child(3),
.rail i:nth-child(6) {
  border-radius: 50%;
}

.board {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 33rem;
}

#minor-grid path {
  fill: none;
  stroke: var(--grid);
}

#major-grid > path {
  fill: none;
  stroke: var(--grid-strong);
}

.axis {
  stroke: rgba(0, 155, 120, 0.54);
  stroke-width: 1.35;
}

.drawing path,
.drawing rect {
  fill: none;
  stroke: var(--blueprint);
  stroke-linecap: square;
  stroke-linejoin: miter;
  stroke-width: 2;
}

.drawing .rebar {
  stroke: var(--green-deep);
  stroke-width: 4;
}

.drawing .stirrup {
  stroke-dasharray: 10 7;
}

.drawing .dimension,
.drawing .callout {
  stroke: var(--orange);
  stroke-width: 1.6;
}

.drawing text {
  fill: var(--blueprint);
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 18px;
}

.inspector {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  border-left: 1px solid var(--line);
}

.inspector b {
  font-size: 1rem;
}

.inspector span {
  border: 1px solid var(--line);
  background: rgba(255, 253, 246, 0.68);
  padding: 0.72rem;
}

.downloads,
.workflow,
.install {
  padding: 3.8rem clamp(1rem, 4vw, 5rem);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(12rem, 0.35fr) 1fr;
  gap: 2rem;
  align-items: end;
  margin-bottom: 1.5rem;
}

.section-head h2 {
  max-width: 18ch;
  margin-bottom: 0;
  font-size: clamp(2rem, 3.8vw, 4.2rem);
  line-height: 0.94;
}

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

.package-card {
  display: flex;
  min-height: 18rem;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid var(--line);
  background: rgba(255, 253, 246, 0.78);
  padding: 1.25rem;
}

.package-card.recommended {
  border-color: rgba(0, 155, 120, 0.45);
  box-shadow: inset 0 0 0 0.22rem rgba(0, 155, 120, 0.1);
}

.package-card h3 {
  margin: 0.75rem 0 0.7rem;
  font-size: 1.55rem;
}

.package-card p {
  color: var(--muted);
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

.package-card a,
.package-card button {
  width: 100%;
  margin-top: auto;
}

.package-card.disabled {
  opacity: 0.62;
}

.package-card button:disabled {
  background: #9aa19a;
  box-shadow: none;
  cursor: not-allowed;
}

.workflow ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.workflow li {
  border-top: 3px solid var(--green);
  background: rgba(255, 253, 246, 0.66);
  min-height: 10rem;
  padding: 1.2rem;
}

.workflow strong {
  display: block;
  margin-bottom: 1.8rem;
  color: var(--orange);
  font-size: 1.4rem;
}

.workflow span {
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  line-height: 1.6;
}

.install-panel {
  display: grid;
  gap: 0.8rem;
  border: 1px solid var(--line);
  background: rgba(255, 253, 246, 0.78);
  padding: clamp(1.2rem, 3vw, 2rem);
}

.install-panel p {
  margin: 0;
  color: var(--muted);
  font-family: "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 1.2rem clamp(1rem, 4vw, 5rem);
}

@media (max-width: 1100px) {
  .hero,
  .section-head {
    grid-template-columns: 1fr;
  }

  .product-visual {
    transform: none;
  }

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

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar nav {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 2.4rem;
  }

  .recommend-card,
  .release-meta,
  .download-grid,
  .workflow ol {
    grid-template-columns: 1fr;
  }

  .release-meta div + div {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .cad-ui {
    grid-template-columns: 3.2rem 1fr;
  }

  .inspector {
    display: none;
  }

  .download-button {
    width: 100%;
  }

  .footer {
    flex-direction: column;
  }
}