/* Polaris homepage — styled in the Fluent design language with plain CSS, so
   the page ships no component-runtime JavaScript. */

/* Build-time renders both languages; show only the active one. */
html[data-lang="en"] [lang="zh"],
html[data-lang="zh"] [lang="en"] {
  display: none;
}

:root {
  --bg: #faf9f8;
  --layer: #ffffff;
  --fg: #201f1e;
  --fg-dim: #605e5c;
  --stroke: #e1dfdd;
  --stroke-strong: #c8c6c4;
  --accent: #0f6cbd;
  --shadow: 0 1.6px 3.6px rgba(0, 0, 0, 0.1), 0 0.3px 0.9px rgba(0, 0, 0, 0.07);
  --maxw: 1040px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1a19;
    --layer: #252423;
    --fg: #f3f2f1;
    --fg-dim: #a19f9d;
    --stroke: #3b3a39;
    --stroke-strong: #484644;
    --accent: #2899f5;
    --shadow: 0 1.6px 3.6px rgba(0, 0, 0, 0.28), 0 0.3px 0.9px rgba(0, 0, 0, 0.22);
  }
}

* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
}
body {
  background: var(--bg);
  color: var(--fg);
  font-family:
    "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.link {
  color: var(--accent);
  text-decoration: underline;
}

/* Buttons / links styled as Fluent buttons (4px radius, accent / neutral / subtle). */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 20px;
  border-radius: 4px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
.btn.accent {
  background: var(--accent);
  color: #fff;
}
.btn.neutral {
  background: var(--layer);
  color: var(--fg);
  border-color: var(--stroke-strong);
}
.btn.subtle {
  height: 34px;
  padding: 0 12px;
  background: transparent;
  color: var(--fg);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  font-weight: 600;
  font-size: 17px;
  text-decoration: none;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 72px;
}

.hero {
  text-align: center;
  padding: 56px 0 48px;
}
.hero-logo {
  filter: drop-shadow(0 6px 18px rgba(0, 0, 0, 0.18));
}
.hero h1 {
  margin: 18px 0 8px;
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.tagline {
  margin: 0 auto;
  max-width: 640px;
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--fg-dim);
}
.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 28px;
}

.features h2 {
  text-align: center;
  font-size: 28px;
  margin: 24px 0 28px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.card {
  background: var(--layer);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}
.card p {
  margin: 0;
  color: var(--fg-dim);
  font-size: 14.5px;
}

.foot {
  text-align: center;
  color: var(--fg-dim);
  font-size: 14px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--stroke);
}
.foot p {
  margin: 6px 0;
}