:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --ink: #151712;
  --muted: #626a5f;
  --line: #dfe3da;
  --accent: #22624a;
  --accent-strong: #123d2c;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(246, 247, 244, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--ink);
  color: #fff;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

nav a:hover,
.footer-links a:hover {
  color: var(--accent);
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: center;
  min-height: calc(100dvh - 80px);
  padding: 64px 0 72px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(46px, 8vw, 92px);
  line-height: 1;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.12;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.25;
}

.lead {
  max-width: 680px;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  font-weight: 700;
}

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

.button.secondary {
  background: transparent;
}

.product-panel {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(38, 46, 32, 0.08);
}

.panel-top {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.panel-top strong {
  color: var(--accent);
}

dl {
  margin: 0;
}

.product-panel dl div,
.company-list div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.product-panel dl div:last-child,
.company-list div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
}

.section {
  padding: 76px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 680px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 34px;
  background: var(--line);
  border: 1px solid var(--line);
}

.feature-grid article,
.update-list article {
  background: var(--surface);
  padding: 28px;
}

.feature-grid p,
.update-list p,
.contact p {
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: 0.85fr 1fr;
  gap: clamp(28px, 6vw, 76px);
}

.update-list {
  display: grid;
  gap: 14px;
}

.update-list article {
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.update-download {
  margin: 22px 0 0;
}

.download-section {
  display: grid;
  grid-template-columns: 0.9fr minmax(320px, 0.75fr);
  gap: clamp(28px, 6vw, 76px);
  align-items: center;
}

.download-copy p {
  max-width: 620px;
  color: var(--muted);
}

.download-panel {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(38, 46, 32, 0.08);
}

.download-panel dl div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.download-panel dl div:first-child {
  padding-top: 0;
}

.download-main {
  width: 100%;
  margin-top: 24px;
}

.download-hint {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.download-modal[hidden] {
  display: none;
}

.download-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(21, 23, 18, 0.38);
}

.download-dialog {
  width: min(460px, 100%);
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 28px 90px rgba(21, 23, 18, 0.2);
}

.download-dialog h2 {
  margin-bottom: 10px;
  font-size: 28px;
}

.download-dialog p {
  color: var(--muted);
}

.download-dialog dl {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.download-dialog dl div {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

time,
code {
  color: var(--accent);
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 13px;
}

.company-list {
  margin-top: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 28px 28px;
}

.contact {
  display: grid;
  grid-template-columns: 0.8fr 1fr;
  gap: clamp(28px, 6vw, 76px);
  align-items: start;
}

address {
  display: grid;
  gap: 12px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-style: normal;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 44px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .hero,
  .split,
  .contact,
  .download-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 44px;
  }

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

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .hero,
  .section,
  .site-footer {
    width: min(100% - 28px, 1180px);
  }

  .brand {
    align-items: flex-start;
  }

  .product-panel dl div,
  .company-list div,
  .download-panel dl div {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}