* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #1a1a1a;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: #1a1a1a; text-decoration: none; transition: opacity 0.15s; }
a:hover { opacity: 0.7; }

img { max-width: 100%; display: block; }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Nav ─────────────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid #eee;
  z-index: 50;
}
.nav-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
}
.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: #1a1a1a;
}
.nav-links a {
  margin-left: 28px;
  font-size: 14px;
  color: #555;
}
.nav-links a:hover { color: #000; opacity: 1; }

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
  padding: 96px 0 80px;
  text-align: center;
  border-bottom: 1px solid #eee;
}
.badge {
  display: inline-block;
  padding: 6px 14px;
  background: #f5f5f7;
  border-radius: 999px;
  font-size: 12px;
  color: #555;
  margin-bottom: 28px;
  letter-spacing: 0.05em;
}
.hero h1 {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}
.hero-sub {
  max-width: 580px;
  margin: 0 auto 24px;
  font-size: 17px;
  color: #555;
  line-height: 1.7;
}
.hero-meta {
  font-size: 13px;
  color: #888;
  margin-top: 32px;
  letter-spacing: 0.08em;
}

/* ── Sections ────────────────────────────────────────────────────────────── */
section {
  padding: 80px 0;
  border-bottom: 1px solid #eee;
}
section h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  letter-spacing: -0.01em;
}

/* ── Features ────────────────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature {
  padding: 28px;
  background: #fafafa;
  border-radius: 12px;
}
.feature h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature p {
  font-size: 14px;
  color: #555;
  line-height: 1.65;
}

/* ── Screenshots ─────────────────────────────────────────────────────────── */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.screenshot-grid img {
  width: 100%;
  border-radius: 14px;
  border: 1px solid #eee;
  background: #fafafa;
}

/* ── About / Contact ─────────────────────────────────────────────────────── */
.about p, .contact p {
  text-align: center;
  font-size: 16px;
  color: #555;
  margin: 0 auto 16px;
  max-width: 640px;
  line-height: 1.75;
}
.email {
  font-size: 18px;
  font-weight: 600;
  margin-top: 12px;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.footer {
  padding: 56px 0 40px;
  background: #1a1a1a;
  color: #ccc;
  font-size: 13px;
}
.footer h4 {
  color: #fff;
  font-size: 14px;
  margin-bottom: 14px;
}
.footer a {
  color: #ccc;
  font-size: 13px;
  line-height: 1.9;
}
.footer a:hover { color: #fff; opacity: 1; }
.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}
.foot-cols p { margin: 4px 0; }
.foot-bottom {
  border-top: 1px solid #333;
  padding-top: 20px;
  font-size: 12px;
  color: #888;
  line-height: 1.7;
}
.beian {
  margin-top: 8px;
  color: #999;
}

/* ── Legal pages (terms / privacy) ───────────────────────────────────────── */
.legal {
  padding: 80px 0;
  max-width: 760px;
  margin: 0 auto;
}
.legal h1 {
  font-size: 36px;
  margin-bottom: 12px;
  text-align: left;
}
.legal .updated {
  color: #888;
  font-size: 14px;
  margin-bottom: 40px;
}
.legal h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 40px 0 14px;
  text-align: left;
}
.legal h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 24px 0 8px;
}
.legal p, .legal li {
  font-size: 15px;
  color: #444;
  margin-bottom: 12px;
  line-height: 1.75;
}
.legal ul, .legal ol {
  margin: 0 0 16px 24px;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .hero h1 { font-size: 40px; }
  .hero { padding: 64px 0 56px; }
  section { padding: 56px 0; }
  .nav-links { display: none; }
  .feature-grid, .screenshot-grid { grid-template-columns: 1fr 1fr; }
  .foot-cols { grid-template-columns: 1fr; gap: 24px; }
  .legal h1 { font-size: 28px; }
}
@media (max-width: 480px) {
  .feature-grid, .screenshot-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
}