:root { color-scheme: light dark; }
*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.7 -apple-system, system-ui, "Segoe UI", Roboto, sans-serif;
  background: #f8fafc;
  color: #0f172a;
}
@media (prefers-color-scheme: dark) {
  body { background: #0a1119; color: #e2e8f0; }
}
.wrap { max-width: 680px; margin: 0 auto; padding: 28px 24px 80px; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 36px;
}
.back {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; color: #64748b; font-size: 0.9rem; font-weight: 500;
}
.back:hover { color: #0284c7; }
.back .mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(135deg, #0ea5e9, #6366f1);
  display: inline-flex; align-items: center; justify-content: center;
}
.langtoggle { font-size: 0.85rem; color: #64748b; }
.langtoggle button {
  background: none; border: none; cursor: pointer; padding: 4px 6px;
  color: inherit; font: inherit;
}
.langtoggle button[aria-pressed="true"] { color: #0284c7; font-weight: 700; }
@media (prefers-color-scheme: dark) { .langtoggle button[aria-pressed="true"] { color: #38bdf8; } }

.hero-icon {
  width: 92px; height: 92px; border-radius: 20px; margin-bottom: 20px;
  box-shadow: 0 8px 24px -8px rgba(0,0,0,.25);
}

.shots {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 16px 0 24px;
}
.shots img {
  flex: 1;
  min-width: 140px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 24px -8px rgba(0,0,0,.25);
}

.appstore {
  display: inline-block;
  background: #0f172a;
  color: #fff;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
}
h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.15; margin: 0 0 10px; letter-spacing: -0.02em; }
.tag { color: #0284c7; font-weight: 600; font-size: 0.9rem; margin: 0 0 28px; }
@media (prefers-color-scheme: dark) { .tag { color: #38bdf8; } }
h2 { font-size: 1.25rem; margin: 36px 0 10px; letter-spacing: -0.01em; }
p { color: #334155; margin: 0 0 14px; }
@media (prefers-color-scheme: dark) { p { color: #cbd5e1; } }
.lead { font-size: 1.1rem; color: #475569; }
@media (prefers-color-scheme: dark) { .lead { color: #94a3b8; } }
ul { color: #334155; padding-left: 20px; margin: 0 0 14px; }
@media (prefers-color-scheme: dark) { ul { color: #cbd5e1; } }
li { margin: 6px 0; }
a { color: #0284c7; }
@media (prefers-color-scheme: dark) { a { color: #38bdf8; } }
.faq { margin: 0 0 20px; }
.faq h3 { font-size: 1.02rem; margin: 0 0 4px; }
.faq p { margin: 0; color: #475569; }
@media (prefers-color-scheme: dark) { .faq p { color: #94a3b8; } }
.note {
  background: rgba(14,165,233,.08); border: 1px solid rgba(14,165,233,.2);
  border-radius: 12px; padding: 16px 18px; margin: 20px 0; font-size: 0.95rem;
}
.muted { color: #94a3b8; font-size: 0.85rem; margin-top: 40px; }
hr { border: none; border-top: 1px solid #e2e8f0; margin: 36px 0; }
@media (prefers-color-scheme: dark) { hr { border-color: #1e293b; } }

/* 雙語:預設顯示英文,JS 切 data-lang */
[data-lang="en"] .zh { display: none; }
[data-lang="zh"] .en { display: none; }