:root {
  --blue: #0272bb;
  --blue-dark: #02619f;
  --ink: #0c1328;
  --muted: #5b657a;
  --line: #d7dee8;
  --bg0: #e8f1f8;
  --bg1: #f7fafc;
  --card: #ffffff;
  --err: #b42318;
  --radius: 14px;
  --font: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(2, 114, 187, 0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(2, 97, 159, 0.12), transparent 50%),
    linear-gradient(180deg, var(--bg0), var(--bg1) 55%, #eef3f8);
}

.shell {
  width: min(640px, calc(100% - 2rem));
  margin: 5vh auto 4rem;
  padding: 2rem 1.75rem 1.75rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 18px 50px rgba(12, 19, 40, 0.08);
}

.brand {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.8rem, 4vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0 0 1.25rem;
  color: var(--muted);
  line-height: 1.5;
}

.hint { margin: 0 0 1rem; color: var(--muted); }
.err {
  margin: 0 0 1rem;
  color: var(--err);
  font-weight: 600;
}

.pin-form label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.pin-form input {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 1.15rem;
  letter-spacing: 0.2em;
  margin-bottom: 0.9rem;
}

.pin-form input:focus {
  outline: 2px solid rgba(2, 114, 187, 0.35);
  border-color: var(--blue);
}

button, .cta {
  appearance: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.pin-form button,
.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.95rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  text-decoration: none;
}

.cta:hover, .pin-form button:hover {
  filter: brightness(1.05);
}

.meta {
  margin: 1rem 0 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.55;
  word-break: break-all;
}

.meta a { color: var(--blue); font-weight: 600; }
.meta code {
  display: inline-block;
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--ink);
}

.note {
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
}

.note h2 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.note p {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.lock { margin-top: 1.25rem; }

.ghost {
  background: transparent;
  color: var(--muted);
  padding: 0.4rem 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.jump {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0 0 1.5rem;
}

.jump a {
  color: var(--blue);
  font-weight: 600;
  font-size: 0.92rem;
}

.howto, .versions {
  border-top: 1px solid var(--line);
  padding-top: 1.15rem;
  margin-bottom: 1.25rem;
}

.howto h2, .versions h2, .howto h3 {
  margin: 0 0 0.65rem;
}

.howto h3 {
  margin-top: 1.1rem;
  font-size: 1rem;
}

.steps, .howto ul, .ver ul {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.94rem;
}

.steps li, .howto ul li, .ver ul li {
  margin-bottom: 0.4rem;
}

.howto p {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.5;
}

code {
  font-family: ui-monospace, "Cascadia Code", "Segoe UI Mono", Consolas, monospace;
  font-size: 0.86em;
  background: #eef4f9;
  padding: 0.08em 0.35em;
  border-radius: 4px;
}

.ver {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.75rem;
}

.ver-latest {
  border-color: rgba(2, 114, 187, 0.45);
  background: rgba(2, 114, 187, 0.04);
}

.ver h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pill {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: var(--blue);
  border-radius: 999px;
  padding: 0.18rem 0.5rem;
}

.ver-meta {
  margin: 0 0 0.55rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.ver-actions {
  margin: 0.4rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.ver-actions a {
  color: var(--blue);
  font-weight: 700;
}

.hash {
  font-size: 0.78rem;
  color: var(--muted);
  word-break: break-all;
}

.hash code {
  background: transparent;
  padding: 0;
}