/* Màu lấy từ chính app: xanh nav #5BAEF0, xanh nền ảnh store #1E8DE7,
   chữ đậm #115084 (primary9), chữ phụ #616678 (neutral6). */
:root {
  --blue: #1e8de7;
  --blue-dark: #115084;
  --ink: #1a1d24;
  --muted: #616678;
  --hairline: #e4e7ec;
  --page: #fbfcfe;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
}

main, footer { max-width: 44rem; margin: 0 auto; padding: 0 20px; }

a { color: var(--blue); }
a:hover { color: var(--blue-dark); }

/* ---- trang chủ ---- */

.hero {
  background: var(--blue);
  color: #fff;
  text-align: center;
  padding: 56px 20px 48px;
}
.hero .appicon {
  border-radius: 22px;
  box-shadow: 0 10px 28px rgba(16, 40, 70, .28);
}
.hero h1 {
  margin: 20px 0 8px;
  font-size: 2.4rem;
  letter-spacing: -.02em;
}
.hero .tagline {
  margin: 0 auto 28px;
  max-width: 24rem;
  font-size: 1.2rem;
  opacity: .95;
}
.store {
  display: inline-block;
  background: #fff;
  color: var(--blue-dark);
  font-weight: 600;
  text-decoration: none;
  padding: 13px 26px;
  border-radius: 999px;
}
.store:hover { color: var(--blue-dark); background: #f0f6ff; }

/* ---- trang trong ---- */

.page-head {
  background: var(--blue);
  color: #fff;
  padding: 28px 20px 32px;
}
.page-head > * { max-width: 44rem; margin-left: auto; margin-right: auto; }
.page-head .back {
  display: block;
  color: #fff;
  opacity: .9;
  text-decoration: none;
  font-weight: 600;
  font-size: .95rem;
}
.page-head h1 { margin: 10px 0 0; font-size: 1.9rem; letter-spacing: -.02em; }
.page-head .date { margin: 8px 0 0; opacity: .85; font-size: .9rem; }

/* ---- nội dung ---- */

section { padding: 36px 0; border-bottom: 1px solid var(--hairline); }
section:last-of-type { border-bottom: 0; }

h2 { font-size: 1.35rem; letter-spacing: -.01em; margin: 0 0 16px; }
h3 { font-size: 1.05rem; margin: 0 0 6px; color: var(--blue-dark); }

.feature { margin: 0 0 24px; }
.feature p { margin: 0; color: var(--muted); }

.privacy-note { background: #f0f6ff; margin: 0 -20px; padding: 36px 20px; }

.prose { padding: 32px 20px 8px; }
.prose h2 { margin-top: 36px; }
.prose h3 { margin-top: 24px; font-size: 1rem; }
.prose ul { color: var(--muted); padding-left: 1.2em; }
.prose li { margin: 4px 0; }

details {
  border-bottom: 1px solid var(--hairline);
  padding: 14px 0;
}
details:last-child { border-bottom: 0; }
summary {
  cursor: pointer;
  font-weight: 600;
  list-style-position: outside;
}
details p { color: var(--muted); margin: 10px 0 0; }

.contact .mail, .prose .mail { font-size: 1.1rem; font-weight: 600; }

code {
  background: #eef1f6;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: .9em;
}

/* ---- chân trang ---- */

footer {
  padding: 32px 20px 48px;
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: .9rem;
}
footer nav { margin-bottom: 14px; }
footer nav a { margin-right: 18px; }
.disclaimer { margin: 0; }

@media (max-width: 480px) {
  body { font-size: 16px; }
  .hero { padding: 40px 20px 36px; }
  .hero h1 { font-size: 2rem; }
}