/* Polarcue promo site. Static, no build step, system fonts only, no third-party resources. */

:root {
  color-scheme: light dark;
  --font:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei",
    "Hiragino Sans GB", system-ui, sans-serif;

  --bg: #f2f2f7;
  --surface: #ffffff;
  --surface-2: #e5e5ea;
  --label: #000000;
  --label-2: rgba(60, 60, 67, 0.66);
  --label-3: rgba(60, 60, 67, 0.4);
  --hairline: rgba(60, 60, 67, 0.16);
  --accent: #0071e3;
  --accent-label: #ffffff;
  --note-bg: rgba(0, 113, 227, 0.08);
  --note-border: rgba(0, 113, 227, 0.22);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --surface-2: #2c2c2e;
    --label: #ffffff;
    --label-2: rgba(235, 235, 245, 0.64);
    --label-3: rgba(235, 235, 245, 0.42);
    --hairline: rgba(255, 255, 255, 0.12);
    --accent: #0a84ff;
    --accent-label: #ffffff;
    --note-bg: rgba(10, 132, 255, 0.14);
    --note-border: rgba(10, 132, 255, 0.32);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--label);
  font: 400 16px / 1.55 var(--font);
  letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 1px solid var(--hairline);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
}

header.hero {
  padding: 56px 0 40px;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: none;
}

.brand span {
  font-size: 20px;
  font-weight: 600;
}

.hero h1 {
  font-size: 30px;
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 14px;
}

.hero .tagline {
  font-size: 17px;
  color: var(--label-2);
  margin: 0 auto 28px;
  max-width: 560px;
}

.disclosure {
  max-width: 560px;
  margin: 0 auto 24px;
  padding: 14px 18px;
  border-radius: 12px;
  background: var(--note-bg);
  border: 1px solid var(--note-border);
  font-size: 14px;
  color: var(--label-2);
  text-align: left;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 24px;
  height: 48px;
  border-radius: 24px;
  background: var(--accent);
  color: var(--accent-label);
  font-size: 16px;
  font-weight: 600;
}

.cta:hover,
.cta:focus-visible {
  text-decoration: none;
  filter: brightness(1.06);
}

.mobile-note {
  display: none;
  max-width: 420px;
  margin: 0 auto;
  padding: 16px 18px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  text-align: left;
}

.mobile-note p {
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--label-2);
}

.mobile-note button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--hairline);
  background: var(--surface-2);
  color: var(--label);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.mobile-note .copy-result {
  margin-top: 8px;
  font-size: 13px;
  color: var(--label-3);
  word-break: break-all;
  user-select: all;
}

section {
  padding: 36px 0;
  border-top: 1px solid var(--hairline);
}

section h2 {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 28px;
}

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 28px 0;
}

.feature:not(:last-child) {
  border-bottom: 1px solid var(--hairline);
}

.feature.reverse .feature-media {
  order: 2;
}

.feature-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 10px;
}

.feature-body p {
  font-size: 15px;
  color: var(--label-2);
  margin: 0;
}

.feature-list {
  padding: 8px 0;
}

.feature-list ul {
  margin: 0;
  padding: 0 0 0 20px;
  font-size: 15px;
  color: var(--label-2);
}

.feature-list li {
  margin-bottom: 8px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 8px 0;
}

.step {
  padding: 20px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--hairline);
}

.step .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-label);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 12px;
}

.step h3 {
  font-size: 15px;
  margin: 0 0 6px;
}

.step p {
  font-size: 14px;
  color: var(--label-2);
  margin: 0;
}

.privacy p {
  font-size: 15px;
  color: var(--label-2);
  max-width: 680px;
  margin: 0 auto 14px;
}

.privacy .policy-link {
  text-align: center;
  display: block;
  margin-top: 8px;
}

.faq-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--hairline);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.faq-item p {
  font-size: 15px;
  color: var(--label-2);
  margin: 0;
}

.cta-block {
  text-align: center;
  padding: 44px 0;
}

.cta-block p {
  color: var(--label-2);
  margin: 0 0 20px;
}

footer {
  border-top: 1px solid var(--hairline);
  padding: 28px 0 44px;
  text-align: center;
  font-size: 13px;
  color: var(--label-3);
}

footer .links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

@media (max-width: 720px) {
  .cta.primary-cta,
  .cta-block .cta,
  .install-hint {
    display: none;
  }

  .mobile-note {
    display: block;
  }

  .feature,
  .feature.reverse .feature-media {
    grid-template-columns: 1fr;
    order: initial;
  }

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

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

  .hero h1 {
    font-size: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none;
    animation: none;
  }
}