:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #5d6972;
  --line: #d7e0e2;
  --paper: #fbfcf8;
  --panel: #ffffff;
  --green: #0f7a61;
  --green-dark: #085a48;
  --teal-soft: #dff4eb;
  --amber: #d88a1d;
  --rose: #b85c69;
  --cyan: #4f94a6;
  --shadow: 0 24px 70px rgba(20, 42, 50, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 0%, rgba(15, 122, 97, 0.12), transparent 34rem),
    linear-gradient(180deg, #f6fbf7 0%, #fbfcf8 38%, #f3f7f2 100%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(251, 252, 248, 0.84);
  border-bottom: 1px solid rgba(215, 224, 226, 0.85);
  backdrop-filter: blur(18px);
}

.brand,
.topbar nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-size: 17px;
  font-weight: 800;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.topbar nav {
  gap: clamp(12px, 3vw, 30px);
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

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

main {
  overflow: hidden;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(42px, 7vw, 88px) clamp(18px, 5vw, 72px) 48px;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 16px;
  font-size: clamp(56px, 8vw, 104px);
  line-height: 0.92;
  letter-spacing: 0;
}

.subtitle {
  max-width: 690px;
  margin-bottom: 18px;
  color: #26343a;
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 800;
  line-height: 1.18;
}

.intro {
  max-width: 650px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 17px;
}

.hero-actions,
.download-top,
.reader-head,
footer {
  display: flex;
  align-items: center;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 850;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(15, 122, 97, 0.16);
}

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

.button.primary.disabled-download {
  background: #6f7d7d;
  border-color: #6f7d7d;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.78);
}

.icon {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  margin-right: 8px;
  font-size: 16px;
}

.download-match {
  max-width: 620px;
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 750;
}

.version-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 620px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.version-strip div {
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.78);
}

.version-strip dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.version-strip dd {
  margin: 4px 0 0;
  font-weight: 900;
}

.product-panel {
  overflow: hidden;
  border: 1px solid rgba(100, 123, 124, 0.28);
  border-radius: 8px;
  background: #f5f8f5;
  box-shadow: var(--shadow);
}

.window-bar {
  display: flex;
  gap: 8px;
  padding: 14px 16px;
  background: #213134;
}

.window-bar span {
  width: 11px;
  height: 11px;
  border-radius: 99px;
  background: #f05d5e;
}

.window-bar span:nth-child(2) {
  background: #efb94f;
}

.window-bar span:nth-child(3) {
  background: #53c97f;
}

.workspace-preview {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  min-height: 520px;
}

.workspace-preview aside {
  padding: 22px 16px;
  color: #deeee8;
  background: #17302e;
}

.workspace-preview aside img {
  width: 42px;
  height: 42px;
  margin-bottom: 12px;
  border-radius: 8px;
}

.workspace-preview aside b,
.workspace-preview aside span {
  display: block;
}

.workspace-preview aside span {
  color: #a8c0b9;
  font-size: 12px;
}

.workspace-preview ul,
.audience-panel ul {
  padding: 0;
  margin: 28px 0 0;
  list-style: none;
}

.workspace-preview li {
  padding: 10px 12px;
  margin-bottom: 8px;
  color: #b9cbc6;
  border-radius: 8px;
}

.workspace-preview li.active {
  color: #102421;
  background: #cdeee1;
  font-weight: 900;
}

.workspace-preview section {
  padding: clamp(22px, 4vw, 34px);
  background:
    linear-gradient(90deg, rgba(15, 122, 97, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(15, 122, 97, 0.08) 1px, transparent 1px),
    #f8fbf5;
  background-size: 34px 34px;
}

.reader-head {
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 24px;
}

.small-label,
.status {
  display: inline-block;
  font-size: 12px;
  font-weight: 850;
}

.small-label {
  color: var(--green);
}

.reader-head h2 {
  margin: 4px 0 0;
  font-size: 28px;
  line-height: 1.15;
}

.status {
  padding: 6px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.status {
  color: var(--green-dark);
  background: var(--teal-soft);
}

.reader-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.reader-grid article,
.assistant-feed,
.feature-grid article,
.system-download-card,
.version-link,
.audience-panel,
.steps article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
}

.reader-grid article {
  min-height: 122px;
  padding: 16px;
}

.reader-grid span {
  color: var(--muted);
}

.reader-grid strong {
  display: block;
  margin-top: 20px;
  font-size: 17px;
  line-height: 1.22;
}

.assistant-feed {
  padding: 18px;
}

.assistant-feed p {
  margin: 0;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.assistant-feed p:last-child {
  border-bottom: 0;
}

.value-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0 clamp(18px, 5vw, 72px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.value-band div {
  padding: 24px;
  background: #fff;
}

.value-band strong,
.value-band span {
  display: block;
}

.value-band strong {
  margin-bottom: 8px;
  font-size: 19px;
}

.value-band span {
  color: var(--muted);
}

.section {
  padding: clamp(70px, 8vw, 110px) clamp(18px, 5vw, 72px);
}

.section-heading {
  max-width: 800px;
  margin-bottom: 28px;
}

.section-heading h2,
.split-section h2 {
  margin-bottom: 12px;
  font-size: clamp(32px, 4.4vw, 56px);
  line-height: 1.08;
}

.section-heading p:last-child {
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article {
  min-height: 230px;
  padding: 24px;
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 20px;
  color: #fff;
  border-radius: 8px;
  background: var(--ink);
  font-weight: 900;
}

.feature-grid article:nth-child(2) .feature-icon,
.feature-grid article:nth-child(5) .feature-icon {
  background: var(--green);
}

.feature-grid article:nth-child(3) .feature-icon {
  background: var(--amber);
}

.feature-grid article:nth-child(4) .feature-icon {
  background: var(--rose);
}

.feature-grid article:nth-child(6) .feature-icon {
  background: var(--cyan);
}

.feature-grid h3 {
  margin-bottom: 10px;
  font-size: 21px;
}

.feature-grid p,
.download-note,
.steps p,
.audience-panel li {
  color: var(--muted);
}

.downloads-section {
  background: #edf5ef;
}

.downloads-section .section-heading {
  max-width: 1040px;
}

.system-download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.system-download-card {
  display: flex;
  flex-direction: column;
  min-height: 290px;
  padding: 22px;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease;
}

.system-download-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(15, 122, 97, 0.14);
}

.system-download-card.disabled {
  opacity: 0.74;
}

.system-card-head {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 22px;
}

.system-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  color: #192326;
  border: 1px solid rgba(23, 32, 38, 0.12);
  border-radius: 8px;
  background: #f8faf7;
}

.system-mark.windows {
  color: #0f6caa;
  background: #eef8fd;
}

.system-mark.linux {
  color: #d88a1d;
  background: #fff7e8;
}

.system-mark svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.system-card-head h3 {
  margin: 0;
  font-size: 25px;
  line-height: 1.1;
}

.system-card-head p {
  margin: 5px 0 0;
  color: var(--green);
  font-size: 13px;
  font-weight: 850;
}

.version-links {
  display: grid;
  gap: 10px;
  margin-top: auto;
}

.version-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  min-height: 76px;
  padding: 14px;
  transition:
    border-color 180ms ease,
    background 180ms ease;
}

.version-link:hover {
  border-color: rgba(15, 122, 97, 0.45);
  background: #f7fbf6;
}

.version-link.recommended {
  border-color: rgba(15, 122, 97, 0.45);
}

.version-link span,
.version-link small {
  min-width: 0;
}

.version-link strong,
.version-link small {
  display: block;
}

.version-link strong {
  margin-bottom: 4px;
  font-size: 17px;
}

.version-link small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.version-link b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 58px;
  min-height: 36px;
  padding: 8px 12px;
  color: #fff;
  border-radius: 8px;
  background: var(--green);
  font-size: 14px;
}

.version-link:hover b {
  background: var(--green-dark);
}

.version-link.unavailable b {
  color: var(--muted);
  background: #e8efea;
}

.download-note {
  margin: 18px 0 0;
  font-size: 14px;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: clamp(24px, 5vw, 64px);
}

.steps {
  display: grid;
  gap: 12px;
}

.steps article {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px;
}

.steps span {
  color: var(--green);
  font-weight: 950;
}

.steps p {
  margin: 0;
}

code {
  padding: 2px 5px;
  border-radius: 5px;
  background: #e8efea;
  color: #253236;
}

.audience-panel {
  align-self: start;
  padding: 26px;
  background: #233536;
}

.audience-panel h3 {
  color: #fff;
  font-size: 24px;
}

.audience-panel li {
  padding: 12px 0;
  color: #d5e2dd;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.audience-panel li:last-child {
  border-bottom: 0;
}

footer {
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(18px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 1050px) {
  .hero,
  .split-section {
    grid-template-columns: 1fr;
  }

  .product-panel {
    max-width: 900px;
  }

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

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

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

  .hero {
    min-height: auto;
    padding-top: 34px;
  }

  h1 {
    font-size: 54px;
  }

  .version-strip,
  .value-band,
  .reader-grid,
  .feature-grid,
  .system-download-grid {
    grid-template-columns: 1fr;
  }

  .system-mark {
    width: 40px;
    height: 40px;
  }

  .workspace-preview {
    grid-template-columns: 1fr;
  }

  .workspace-preview aside {
    display: none;
  }

  .reader-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .version-link {
    grid-template-columns: 1fr;
  }

  .version-link b {
    width: 100%;
  }
}