:root {
  color-scheme: light dark;
  --page: #f5f4f0;
  --surface: #ffffff;
  --ink: #1d2024;
  --muted: #5b626b;
  --line: #d9d7d0;
  --accent: #1f5f8b;
  --on-accent: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #15181c;
    --surface: #1e2227;
    --ink: #e8e9ea;
    --muted: #a3aab2;
    --line: #343a41;
    --accent: #7cb9e2;
    --on-accent: #10222f;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 16px 64px;
}

h1 { margin: 0 0 12px; font-size: 2.4rem; line-height: 1.15; letter-spacing: -0.01em; }
h2 { margin: 40px 0 14px; font-size: 1.3rem; }
h3 { margin: 0 0 14px; font-size: 1.15rem; }
p { margin: 0 0 12px; max-width: 64ch; }
ol { margin: 16px 0; padding-left: 1.3em; }
li { margin-bottom: 6px; }
code { font-family: ui-monospace, SFMono-Regular, Consolas, Menlo, monospace; font-size: 0.92em; }

.version, .size, .hash-label { color: var(--muted); font-size: 0.93rem; }
.version { margin-top: 4px; }
.size { margin: 10px 0 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 16px; }

article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.button {
  display: block;
  padding: 12px 16px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  text-align: center;
  text-decoration: none;
}

.button:hover { filter: brightness(1.1); }
.button:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }

.hash-label { margin: 0 0 2px; }
.hash { margin: 0; overflow-wrap: anywhere; color: var(--muted); font-size: 0.85rem; }

form { max-width: 420px; }
label { display: block; margin: 18px 0 6px; font-weight: 600; }
input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}
input:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }
input:disabled { opacity: 0.6; }
.hint { margin: 6px 0 0; color: var(--muted); font-size: 0.9rem; }
form .button { width: 100%; margin-top: 24px; border: 0; font: inherit; font-weight: 600; cursor: pointer; }
form .button:disabled { opacity: 0.6; cursor: wait; filter: none; }
.status { min-height: 1.55em; margin: 14px 0 0; }
.status.error { color: #b3261e; font-weight: 600; }
.done { max-width: 420px; }
.done .button { display: block; }
.version a { color: inherit; }
@media (prefers-color-scheme: dark) { .status.error { color: #ff9a92; } }