:root {
  --bg: #f7f9fe;
  --surface: #ffffff;
  --surface-alt: #eef3fc;
  --text: #1a1c20;
  --text-muted: #4a5160;
  --primary: #1565c0;
  --on-primary: #ffffff;
  --primary-soft: #d8e6ff;
  --on-primary-soft: #001b3e;
  --border: #d6dde8;
  --ok: #1b7a3a;
  --no: #b3261e;
  --radius: 16px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --surface: #1b1e24;
    --surface-alt: #22262e;
    --text: #e3e6ee;
    --text-muted: #aab1bf;
    --primary: #a8c8ff;
    --on-primary: #00315f;
    --primary-soft: #1d3a63;
    --on-primary-soft: #d8e6ff;
    --border: #343a45;
    --ok: #7bd88f;
    --no: #ffb4ab;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", Roboto, sans-serif;
}

a { color: var(--primary); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  font-size: 15px;
}
.topbar .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text); text-decoration: none; }
.topbar .brand img { width: 32px; height: 32px; border-radius: 8px; }

.hero { padding: 40px 0 32px; }
.hero .icon { width: 88px; height: 88px; border-radius: 22px; box-shadow: 0 6px 20px rgba(21, 101, 192, .25); }
.hero h1 { font-size: clamp(32px, 6vw, 48px); line-height: 1.2; margin: 20px 0 12px; }
.hero h1 small { display: block; font-size: .45em; font-weight: 500; color: var(--text-muted); margin-top: 6px; }
.hero .lead { font-size: 19px; max-width: 760px; margin: 0 0 24px; }
.hero .facts { color: var(--text-muted); font-size: 15px; margin: 16px 0 0; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border-radius: 14px;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-outline { border: 1.5px solid var(--border); color: var(--text); background: var(--surface); }

section { padding: 32px 0; }
h2 { font-size: 28px; line-height: 1.3; margin: 0 0 20px; }
h3 { font-size: 20px; line-height: 1.4; margin: 0 0 8px; }

.shots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
}
.shots figure { margin: 0; }
.shots img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.shots figcaption { text-align: center; font-size: 15px; color: var(--text-muted); margin-top: 8px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.card p { margin: 0; color: var(--text-muted); }

.compat { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.compat ul { margin: 0; padding-left: 1.2em; }
.compat li { margin: 6px 0; }
.compat .ok h3 { color: var(--ok); }
.compat .no h3 { color: var(--no); }

.faq .item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 12px; }
.faq .item p { margin: 0; color: var(--text-muted); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .85em;
  background: var(--surface-alt);
  padding: 2px 6px;
  border-radius: 6px;
  overflow-wrap: anywhere;
}

.privacy { background: var(--primary-soft); color: var(--on-primary-soft); border-radius: var(--radius); padding: 24px; }
.privacy h2 { margin-bottom: 12px; }
.privacy ul { margin: 0; padding-left: 1.2em; }

footer { padding: 32px 0 48px; color: var(--text-muted); font-size: 15px; border-top: 1px solid var(--border); margin-top: 16px; }

@media (max-width: 720px) {
  body { font-size: 16px; }
  .hero { padding-top: 16px; }
  .hero .lead { font-size: 17px; }
  .shots { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  h2 { font-size: 24px; }
}