:root {
  --green: #2f9d6c;
  --green-ink: #1f7a52;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.1);
  --paper: #ffffff;
  --soft: #f5f5f7;
  --button: #1d1d1f;
  --button-ink: #ffffff;
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
h1, h2 { text-wrap: balance; }
a { color: var(--green-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.18em; }

html[data-lang="zh"] .en,
html[data-lang="en"] .zh { display: none !important; }

.wrap {
  width: min(1040px, calc(100% - 2.5rem));
  margin: 0 auto;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  padding: calc(0.7rem + env(safe-area-inset-top)) 0 0.7rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--green-ink);
  font-weight: 600;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; color: var(--green); }
.mark {
  display: inline-block;
  width: 1.3rem;
  height: 1rem;
  flex-shrink: 0;
  background-color: var(--green-ink);
  -webkit-mask: url("../img/wifi-line-icon.svg") center / contain no-repeat;
  mask: url("../img/wifi-line-icon.svg") center / contain no-repeat;
}
.brand:hover .mark { background-color: var(--green); }
.nav nav { display: flex; gap: 1.1rem; font-size: 0.9rem; }
.nav nav a { color: var(--muted); white-space: nowrap; }
.nav nav a:hover { color: var(--ink); text-decoration: none; }
.nav nav a[aria-current="page"] { color: var(--ink); }

/* Buttons */
.store {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border-radius: 0.8rem;
  background: var(--green);
  color: #ffffff;
  font-weight: 600;
  font-size: 1rem;
}
.store:hover { text-decoration: none; background: var(--green-ink); }

/* Screenshots */
.shot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1.4rem;
  border: 1px solid var(--line);
  background: var(--soft);
}
.shot.land { border-radius: 1rem; }

/* Home */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.3rem, 6vw, 3.8rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.hero p {
  max-width: 34rem;
  margin: 1rem auto 1.8rem;
  color: var(--muted);
  font-size: 1.2rem;
}
.feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  align-items: center;
  padding: 4rem 0;
  border-top: 1px solid var(--line);
}
.feature h2,
.section h2 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.feature p { margin: 0 0 0.8rem; color: var(--muted); font-size: 1.05rem; }
.feature p:last-child { margin-bottom: 0; }
.shots {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: flex-end;
}
.shots .shot { width: auto; max-width: 250px; flex: 1 1 0; min-width: 0; }
.shots.stack {
  display: block;
  position: relative;
  width: min(100%, 500px);
  margin: 0 auto;
}
.shots.stack .shot { max-width: none; }
.shots.stack .shot:not(.land) {
  position: relative;
  z-index: 1;
  width: 36%;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.14);
}
.shots.stack .shot.land {
  position: absolute;
  right: 0;
  bottom: 12%;
  width: 80%;
}

.section {
  padding: 4rem 0;
  border-top: 1px solid var(--line);
}
.section > p { max-width: 40rem; color: var(--muted); font-size: 1.05rem; margin: 0 0 1.5rem; }
.section.center { text-align: center; }
.section.center > p { margin-inline: auto; }

.compare {
  width: 100%;
  max-width: 44rem;
  margin: 0 auto;
  border-collapse: collapse;
  font-size: 1rem;
}
.compare th,
.compare td {
  padding: 0.8rem 0.6rem;
  border-bottom: 1px solid var(--line);
  text-align: center;
  vertical-align: middle;
}
.compare tbody th { text-align: left; font-weight: 400; padding-left: 0; }
.compare thead th { font-size: 1.05rem; font-weight: 600; border-bottom-color: var(--ink); }
.compare thead th:last-child,
.compare td:last-child { color: var(--green-ink); }
.compare th + th,
.compare td { width: 28%; }
.compare .yes { font-weight: 600; }
.compare .no { color: var(--muted); }

.steps { margin: 0; padding-left: 1.3rem; }
.steps li { padding-left: 0.3rem; }
.steps li + li { margin-top: 0.9rem; }
.steps strong { display: block; }
.steps span.sub, .steps .sub { color: var(--muted); }
.section > p.more { margin: 1.5rem 0 0; }

.note {
  padding: 2.5rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}
.note p { margin: 0; }

/* Footer */
.foot {
  background: var(--soft);
  color: var(--muted);
  font-size: 0.88rem;
}
.foot .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 1.4rem;
  padding: 1.6rem 0 calc(1.6rem + env(safe-area-inset-bottom));
}
.foot a { color: var(--ink); }
.foot nav { display: flex; flex-wrap: wrap; gap: 0.3rem 1.1rem; }

/* Docs: help + privacy */
.doc {
  width: min(48rem, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}
.doc h1 { margin: 0 0 0.5rem; font-size: clamp(2rem, 5vw, 2.6rem); letter-spacing: -0.03em; line-height: 1.15; }
.doc .lede { color: var(--muted); font-size: 1.1rem; margin-top: 0; }
.doc .updated { color: var(--muted); margin-top: 0; font-size: 0.92rem; }
.doc h2 { margin: 2.4rem 0 0.5rem; font-size: 1.3rem; letter-spacing: -0.01em; }
.doc h3 { margin: 1.4rem 0 0.3rem; font-size: 1.05rem; }
.doc p, .doc li { font-size: 1.02rem; }
.doc ul, .doc ol { padding-left: 1.2rem; }
.doc li + li { margin-top: 0.4rem; }

.faq { margin-top: 0.6rem; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 0.85rem 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 0.5rem 0 0.1rem; color: var(--muted); }

@media (min-width: 820px) {
  .feature { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 3.5rem; }
  .feature.flip .text { order: 2; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --green-ink: #6fdca8;
    --ink: #f5f5f7;
    --muted: #a1a1a6;
    --line: rgba(255, 255, 255, 0.14);
    --paper: #000000;
    --soft: #161617;
    --button: #f5f5f7;
    --button-ink: #000000;
    color-scheme: dark;
  }
  .nav { background: rgba(0, 0, 0, 0.72); }
}