:root {
  --bg: #f3fafc;
  --ink: #143646;
  --soft: #4d7384;
  --card: #ffffff;
  --line: rgba(61, 111, 134, 0.16);
  --accent: #2f7f9a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 100% -10%, #d7f0f6, transparent 60%),
    radial-gradient(700px 380px at -10% 110%, #e7f6ea, transparent 55%),
    var(--bg);
  line-height: 1.55;
}
a { color: var(--accent); }
.nav, main, .footer { width: min(980px, calc(100% - 32px)); margin: 0 auto; }
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 0 8px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; font-size: 22px; color: inherit; text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav-links { display: flex; gap: 16px; margin-left: auto; }
.nav-links a { color: var(--soft); text-decoration: none; }
.langs { display: flex; gap: 4px; }
.langs a {
  text-decoration: none;
  color: var(--soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 13px;
  font-weight: 700;
}
.langs a[aria-current="true"] { background: var(--ink); color: white; border-color: var(--ink); }
.hero { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 36px; align-items: center; padding: 28px 0 10px; }
h1 { font-size: clamp(36px, 5vw, 58px); line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 14px; }
.lead { color: var(--soft); font-size: 18px; margin: 0 0 22px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 14px;
  padding: 12px 18px;
  font-weight: 700;
}
.hint, .section-sub, .license-note, .footer { color: var(--soft); }
.shot {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 12px;
  box-shadow: 0 18px 40px rgba(20, 54, 70, 0.08);
}
.shot img { width: 100%; border-radius: 14px; display: block; cursor: zoom-in; }
.section { padding: 42px 0 8px; }
.section h2 { margin: 0 0 8px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 18px; }
.card { background: rgba(255,255,255,0.8); border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--soft); }
.dl { max-width: 560px; margin-top: 18px; }
.dl .btn { margin-bottom: 8px; }
.hash { font-family: Consolas, monospace; font-size: 12px; word-break: break-all; }
.footer { padding: 28px 0 40px; text-align: center; }
.lightbox {
  width: 100vw; height: 100vh; max-width: none; margin: 0; border: 0; background: transparent; padding: 0;
}
.lightbox[open] { display: grid; place-items: center; }
.lightbox::backdrop { background: rgba(12, 28, 36, 0.78); backdrop-filter: blur(12px); }
.lightbox img { max-width: min(960px, calc(100vw - 40px)); max-height: calc(100vh - 80px); border-radius: 16px; }
.lightbox figcaption { color: #f4fbfd; text-align: center; margin-top: 10px; }
@media (max-width: 800px) {
  .hero, .cards { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}