:root {
  color-scheme: dark;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #0d0f10;
  color: #f7f8f8;
  --ink: #0d0f10;
  --muted: #a4aaa8;
  --paper: #f4f6f5;
  --surface: #121516;
  --surface-blue: #dfe5e2;
  --line: #2b302e;
  --line-strong: #3a403e;
  --accent: #59ddbb;
  --accent-hover: #78e7c9;
  --accent-soft: #143e34;
  --green: #59ddbb;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: #f7f8f8; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  height: 64px;
  padding: 0 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(13, 15, 16, 0.94);
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  gap: 36px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.brand img { width: 30px; height: 30px; border-radius: 6px; }
.site-header nav { display: flex; gap: 26px; margin-right: auto; color: #b9bfbd; font-size: 14px; }
.site-header nav a:hover { color: #fff; }
.header-download {
  padding: 9px 15px;
  border: 1px solid #4a504e;
  border-radius: 6px;
  background: transparent;
  color: #f7f8f8;
  font-size: 13px;
}
.header-download:hover { border-color: var(--accent); color: var(--accent); }

.hero {
  min-height: 640px;
  height: min(820px, calc(100svh - 72px));
  padding: 104px max(24px, calc((100vw - 1520px) / 2)) 44px;
  border-bottom: 1px solid var(--line);
  background: #0d0f10;
  display: grid;
  grid-template-columns: minmax(360px, 0.76fr) minmax(0, 1.64fr);
  align-items: center;
  gap: clamp(38px, 4vw, 72px);
  overflow: hidden;
}

.hero-product {
  position: static;
  grid-column: 2;
  grid-row: 1;
  display: block;
  width: 100%;
  aspect-ratio: 1500 / 901;
  object-fit: contain;
  border: 1px solid #3a403e;
  border-radius: 8px;
  background: #111827;
  box-shadow: 0 28px 72px rgba(0, 0, 0, 0.5);
}

.hero-content {
  position: relative;
  z-index: 2;
  grid-column: 1;
  grid-row: 1;
  width: auto;
  margin: 0;
  padding: 0;
}
.release-line { display: flex; align-items: center; gap: 8px; color: #c4c9c7; font-size: 13px; }
.release-line span { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }
.release-line strong { color: var(--accent); }
.hero h1 { margin: 30px 0 18px; max-width: 460px; font-size: 62px; line-height: 1.06; letter-spacing: 0; }
.hero-copy { max-width: 410px; margin: 0; color: #c0c5c3; font-size: 18px; line-height: 1.75; }
.hero-actions { margin-top: 32px; display: flex; align-items: center; gap: 22px; }
.download-button {
  min-height: 62px;
  padding: 0 22px;
  border-radius: 6px;
  background: var(--accent);
  color: #07130f;
  display: inline-flex;
  align-items: center;
  gap: 13px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
}
.download-button:hover { background: var(--accent-hover); }
.download-button span:last-child { display: flex; flex-direction: column; gap: 2px; }
.download-button strong { font-size: 14px; }
.download-button small { color: #31574c; font-size: 11px; }
.download-mark { font-size: 25px; line-height: 1; }
.text-link { color: #d8dcda; border-bottom: 1px solid #747a78; font-size: 13px; padding-bottom: 3px; }
.text-link:hover { border-color: var(--accent); color: var(--accent); }
.hero-meta { margin-top: 22px; color: #818886; font-size: 12px; }

.section-inner { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.workflow-band, .features-band, .changelog-band { padding: 96px 0; }
.workflow-band { background: var(--paper); color: #111514; }
.section-heading p, .compatibility-inner > div > p, .download-inner p {
  margin: 0 0 12px;
  color: #65706c;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}
.section-heading h2, .compatibility-inner h2, .download-inner h2 {
  margin: 0;
  max-width: 650px;
  font-size: 38px;
  line-height: 1.25;
  letter-spacing: 0;
}
.workflow-list {
  list-style: none;
  margin: 58px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid #c9cfcc;
}
.workflow-list li { min-height: 190px; padding: 22px 24px 0 0; border-right: 1px solid #c9cfcc; }
.workflow-list li + li { padding-left: 24px; }
.workflow-list li:last-child { border-right: 0; }
.workflow-list span { display: block; color: #7f8985; font: 12px Consolas, monospace; }
.workflow-list strong { display: block; margin-top: 36px; font-size: 17px; }
.workflow-list p { color: #626b68; font-size: 13px; line-height: 1.7; }

.features-band { background: var(--surface); }
.section-heading.wide h2 { max-width: 760px; }
.feature-grid { margin-top: 56px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.feature-grid article { min-height: 230px; padding: 28px 28px 26px 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-grid article:nth-child(3n + 2), .feature-grid article:nth-child(3n + 3) { padding-left: 28px; }
.feature-grid article:nth-child(3n) { border-right: 0; }
.feature-grid article > span { color: var(--accent); font-size: 11px; font-weight: 700; }
.feature-grid h3 { margin: 46px 0 12px; font-size: 20px; }
.feature-grid p { margin: 0; max-width: 300px; color: var(--muted); font-size: 13px; line-height: 1.75; }

.compatibility-band { padding: 76px 0; background: var(--surface-blue); color: #101412; }
.compatibility-inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; }
.app-list { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; }
.app-list span {
  height: 44px;
  padding: 0 14px 0 8px;
  border: 1px solid #aeb8b4;
  border-radius: 6px;
  background: transparent;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}
.app-list i { width: 28px; height: 28px; border-radius: 4px; color: #fff; font-style: normal; display: grid; place-items: center; font-weight: 700; }
.app-excel { background: #17845b; }
.app-word { background: #2f68b2; }
.app-ppt { background: #c55032; }
.app-wps { background: #d33c39; }

.changelog-band { background: #f4f6f5; color: #111514; }
.changelog-inner { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 80px; }
.changelog-inner time { display: block; margin-top: 18px; color: #6d7673; font-size: 12px; }
.release-notes { margin: 0; padding: 0; list-style: none; border-top: 1px solid #cbd1ce; }
.release-notes li { padding: 20px 0; border-bottom: 1px solid #cbd1ce; color: #3d4643; line-height: 1.65; }

.download-band { padding: 74px 0; background: var(--accent); color: #07130f; }
.download-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.download-inner p { color: #2d5d50; }
.download-button.inverse { background: #101412; color: #fff; box-shadow: none; }
.download-button.inverse:hover { background: #252a28; }
.download-button.inverse small { color: #99a19e; }

footer {
  height: 78px;
  padding: 0 28px;
  border-top: 1px solid var(--line);
  background: #0d0f10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #777f7c;
  font-size: 12px;
}

@media (max-width: 1100px) {
  .hero {
    grid-template-columns: minmax(320px, 0.78fr) minmax(0, 1.35fr);
    gap: 32px;
  }
  .hero h1 { font-size: 52px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
}

@media (max-width: 900px) {
  .site-header { padding: 0 16px; gap: 16px; }
  .site-header nav { display: none; }
  .header-download { margin-left: auto; }
  .hero {
    height: auto;
    min-height: 0;
    padding: 112px 16px 56px;
    grid-template-columns: 1fr;
    gap: 36px;
    overflow: visible;
  }
  .hero-content { grid-column: 1; grid-row: 1; }
  .hero-product { grid-column: 1; grid-row: 2; width: 100%; }
  .hero h1 { font-size: 48px; }
  .hero-copy { max-width: 560px; font-size: 16px; }
  .hero-actions { align-items: center; flex-direction: row; gap: 20px; }
  .section-inner { width: calc(100% - 32px); }
  .workflow-band, .features-band, .changelog-band { padding: 68px 0; }
  .section-heading h2, .compatibility-inner h2, .download-inner h2 { font-size: 30px; }
  .workflow-list { grid-template-columns: 1fr 1fr; }
  .workflow-list li:nth-child(2) { border-right: 0; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid article, .feature-grid article:nth-child(3n + 2), .feature-grid article:nth-child(3n + 3) { padding-left: 0; padding-right: 22px; }
  .feature-grid article:nth-child(odd) { border-right: 1px solid var(--line); }
  .feature-grid article:nth-child(even) { border-right: 0; padding-left: 22px; }
  .compatibility-inner, .download-inner { align-items: flex-start; flex-direction: column; }
  .app-list { justify-content: flex-start; }
  .changelog-inner { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 560px) {
  .brand span { display: none; }
  .header-download { font-size: 12px; }
  .hero { padding-top: 104px; gap: 30px; }
  .hero h1 { margin-top: 26px; font-size: 42px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .workflow-list, .feature-grid { grid-template-columns: 1fr; }
  .workflow-list li, .workflow-list li + li { padding: 22px 0; border-right: 0; border-bottom: 1px solid #c9cfcc; }
  .feature-grid article, .feature-grid article:nth-child(even) { padding: 22px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .app-list span { flex: 1 1 140px; }
  footer { padding: 0 16px; }
}