:root {
  --bg: #f5f8fb;
  --bg2: #eef2f7;
  --card: #ffffff;
  --line: #dfe5ec;
  --text: #14181f;
  --muted: #5a6473;
  --accent: #41e1fa;
  --accent-text: #0a8ba6;
  --accent-ink: #06222a;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: radial-gradient(1200px 500px at 50% -10%, rgba(65, 225, 250, .28), transparent 60%), var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

.top { border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .8); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 5; }
.top-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }

.lang { display: flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.lang button { background: none; border: 0; color: var(--muted); padding: 6px 14px; font: inherit; font-size: 13px; cursor: pointer; }
.lang button.on { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.lang { background: var(--card); }

.hero { text-align: center; padding: 64px 0 40px; }
.hero h1 { font-size: clamp(30px, 6vw, 48px); margin: 0 0 12px; line-height: 1.15; }
.sub { color: var(--muted); margin: 0 auto 28px; max-width: 560px; font-size: 18px; }
.hero-cta { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.ver { color: var(--muted); font-size: 14px; }

.btn {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 600;
  padding: 12px 18px; border-radius: 12px; border: 1px solid var(--accent);
  transition: transform .12s ease, filter .12s ease;
}
.btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.primary { display: inline-flex; padding: 14px 28px; font-size: 17px; }
.btn small { font-weight: 400; opacity: .75; white-space: nowrap; }
.btn[aria-disabled="true"] { opacity: .45; pointer-events: none; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; padding: 8px 0 24px; }

.card { box-shadow: 0 1px 2px rgba(20, 24, 31, .04); background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.card.mine { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 10px 30px rgba(65, 225, 250, .25); }
.card-h { display: flex; align-items: center; gap: 12px; }
.card-h h2 { margin: 0; font-size: 22px; }
.files { display: flex; flex-direction: column; gap: 12px; margin-top: 4px; }
.file { display: flex; flex-direction: column; gap: 6px; }

.hash { display: flex; }
.hash .copy { background: none; border: 1px solid var(--line); color: var(--muted); border-radius: 6px; padding: 2px 10px; font: 12px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; cursor: pointer; }
.hash .copy:hover { border-color: var(--accent); color: var(--text); }

.muted { color: var(--muted); margin: 0; }
.hint { color: var(--muted); font-size: 14px; margin: 0; }
code { background: var(--bg2); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; font-size: 13px; }

.how, .verify { padding: 24px 0; }
.how h2, .verify h2 { font-size: 24px; margin: 0 0 12px; }
.how ol { padding-left: 22px; margin: 0 0 12px; }
.how li { margin: 8px 0; }

pre { background: var(--bg2); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; overflow-x: auto; margin: 10px 0 0; }
pre code { background: none; border: 0; padding: 0; }

.foot { padding: 40px 16px 48px; text-align: center; font-size: 14px; display: flex; flex-direction: column; align-items: center; gap: 14px; border-top: 1px solid var(--line); margin-top: 16px; }
.foot-logo { width: 88px; height: auto; opacity: .95; }

@media (max-width: 480px) {
  .hero { padding: 40px 0 28px; }
  .btn { padding: 12px 14px; font-size: 15px; }
}

.bot {
  display: flex; align-items: center; gap: 14px; text-align: left;
  max-width: 460px; margin: 26px auto 0; padding: 14px 18px;
  color: var(--text); text-decoration: none;
  background: linear-gradient(135deg, rgba(52, 170, 223, .14), rgba(255, 255, 255, .9));
  border: 1px solid rgba(52, 170, 223, .45); border-radius: 16px;
  box-shadow: 0 6px 22px rgba(52, 170, 223, .16);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.bot[hidden] { display: none; }
.bot:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 10px 30px rgba(52, 170, 223, .28); }
.bot img { flex: none; border-radius: 50%; }
.bot-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.bot-text strong { font-size: 16px; line-height: 1.3; }
.bot-sub { color: var(--muted); font-size: 14px; }
.bot-sub b { color: var(--accent-text); font-weight: 600; }
.bot-arrow { flex: none; margin-left: auto; color: var(--accent-text); transition: transform .15s ease; }
.bot:hover .bot-arrow { transform: translateX(3px); }