/* Generic file-share styling. Plain system-font card. */
:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1f2329;
  --muted: #6b7280;
  --accent: #2b6cb0;
  --border: #e2e5ea;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 28px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
}
.logo {
  font-size: 40px;
  line-height: 1;
  margin-bottom: 8px;
  color: var(--accent);
}
h1 { font-size: 20px; margin: 0 0 12px; font-weight: 600; }
p { margin: 8px 0; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.btn {
  display: inline-block;
  margin: 14px 0 6px;
  padding: 11px 18px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
}
.btn:hover { filter: brightness(1.05); }
.btn-plain {
  margin-top: 16px;
  padding: 10px 16px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn-plain:hover { background: var(--bg); }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --card: #1e2127;
    --ink: #e6e8eb;
    --muted: #9aa1ab;
    --border: #2c303a;
    --accent: #5b9bd5;
  }
}