:root {
  --sky-900: #123743;
  --sky-700: #1e6475;
  --sky-500: #4faec4;
  --sky-300: #a9dce6;
  --sky-100: #e9f7fa;
  --paper: #fbfcfb;
  --paper-soft: #f4f8f8;
  --ink: #17313a;
  --ink-muted: #5d747b;
  --rule: rgba(30, 100, 117, 0.18);
  --shadow: 0 28px 80px rgba(21, 79, 96, 0.14);
  --font-display: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "Iowan Old Style", Georgia, serif;
  --font-body: "Avenir Next", "Nunito", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 4%, rgba(169, 220, 230, 0.42), transparent 30rem),
    linear-gradient(180deg, #f7fbfb 0%, var(--paper) 38%, #f8fbfb 100%);
  font-family: var(--font-body);
  line-height: 1.6;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 20px 0;
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--ink-muted);
  font-size: 14px;
}

.nav a:hover {
  color: var(--sky-700);
}

.language-toggle {
  min-width: 48px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 8px 13px;
  color: var(--sky-700);
  background: rgba(255, 255, 255, 0.72);
  font: 600 13px/1 var(--font-body);
  cursor: pointer;
}

.section {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  align-items: center;
  gap: 64px;
  min-height: calc(100vh - 76px);
  padding: 68px 0 96px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--sky-700);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 22px;
  color: var(--sky-900);
  font-family: var(--font-display);
  font-size: clamp(64px, 9vw, 124px);
  font-weight: 500;
  line-height: 0.92;
}

h2 {
  max-width: 760px;
  margin-bottom: 18px;
  color: var(--sky-900);
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 500;
  line-height: 1.08;
}

h3 {
  margin-bottom: 12px;
  color: var(--sky-900);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 500;
}

.lede {
  max-width: 620px;
  margin-bottom: 34px;
  color: var(--ink-muted);
  font-size: 19px;
  line-height: 1.82;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border-radius: 999px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 700;
}

.button-primary {
  color: white;
  background: var(--sky-700);
  box-shadow: 0 14px 30px rgba(30, 100, 117, 0.22);
}

.button-primary:hover {
  background: #185766;
}

.button-secondary {
  border: 1px solid var(--rule);
  color: var(--sky-700);
  background: rgba(255, 255, 255, 0.76);
}

.release-note {
  max-width: 560px;
  color: var(--ink-muted);
  font-size: 14px;
}

.product-figure {
  position: relative;
  margin: 0;
}

.product-figure::before {
  position: absolute;
  inset: 9% 4% -8%;
  z-index: -1;
  border-radius: 26px;
  background: rgba(79, 174, 196, 0.12);
  content: "";
  filter: blur(2px);
}

.product-figure img {
  display: block;
  width: 100%;
  border: 1px solid rgba(30, 100, 117, 0.12);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.feature-section,
.workflow-section,
.download-section {
  padding: 96px 0;
}

.section-heading {
  margin-bottom: 42px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card,
.download-card {
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.58);
}

.feature-card {
  padding: 30px;
}

.feature-card p,
.workflow-copy p,
.download-section p {
  color: var(--ink-muted);
}

.feature-index {
  display: block;
  margin-bottom: 34px;
  color: var(--sky-500);
  font-family: var(--font-display);
  font-size: 18px;
}

.workflow-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 72px;
  align-items: start;
}

.workflow-copy p {
  max-width: 700px;
  font-size: 17px;
}

.steps {
  display: grid;
  gap: 14px;
}

.step {
  display: grid;
  grid-template-columns: 42px 1fr;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--rule);
  padding: 20px 0;
}

.step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  color: var(--sky-700);
  background: var(--sky-100);
  font-family: var(--font-display);
}

.step p {
  margin: 0;
  color: var(--sky-900);
  font-size: 18px;
}

.download-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(360px, 1fr);
  gap: 54px;
  align-items: center;
}

.download-grid {
  display: grid;
  gap: 16px;
}

.download-card {
  display: grid;
  gap: 8px;
  padding: 26px;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.download-card:hover {
  border-color: rgba(30, 100, 117, 0.34);
  background: rgba(255, 255, 255, 0.82);
  transform: translateY(-2px);
}

.platform {
  color: var(--sky-500);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.download-card strong {
  color: var(--sky-900);
  font-size: 22px;
}

.download-card span:last-child {
  color: var(--ink-muted);
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  border-top: 1px solid var(--rule);
  padding: 30px 0 44px;
  color: var(--ink-muted);
  font-size: 14px;
}

.site-footer span:first-child {
  color: var(--sky-900);
  font-family: var(--font-display);
  font-size: 18px;
}

@media (max-width: 900px) {
  .site-header {
    width: min(100% - 28px, 720px);
  }

  .nav {
    display: none;
  }

  .section,
  .site-footer {
    width: min(100% - 28px, 720px);
  }

  .hero,
  .workflow-section,
  .download-section {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .hero {
    min-height: auto;
    padding: 48px 0 72px;
  }

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

  .feature-section,
  .workflow-section,
  .download-section {
    padding: 68px 0;
  }
}

@media (max-width: 560px) {
  .hero-actions,
  .button {
    width: 100%;
  }

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