:root {
  --bg: #f4f1ea;
  --ink: #1a1a18;
  --muted: #5c5a55;
  --card: #fffdf8;
  --line: #e4dfd4;
  --accent: #0f6b4c;
  --accent-ink: #fffdf8;
  --warn-bg: #f8efe3;
  --warn-ink: #6a4a12;
  --ok-bg: #e7f3ee;
  --ok-ink: #0f6b4c;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 1.5rem 1rem 2.5rem;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    "Yu Gothic", YuGothic, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}

.card {
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.5rem 1.35rem 1.75rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 700;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.65rem;
  line-height: 1.3;
}

h2 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1rem;
}

.lead,
.note,
.filename,
.checksum,
footer,
.noscript {
  color: var(--muted);
  font-size: 0.92rem;
}

.lead {
  margin: 0 0 1.25rem;
}

.meta {
  display: grid;
  gap: 0.75rem;
  margin: 0 0 1.25rem;
  padding: 0.9rem 1rem;
  background: var(--bg);
  border-radius: 12px;
}

.meta div {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: 0.5rem;
  align-items: baseline;
}

dt {
  margin: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

dd {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.btn {
  display: block;
  width: 100%;
  padding: 0.95rem 1rem;
  text-align: center;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: 12px;
  min-height: 3rem;
}

.btn:hover,
.btn:focus-visible {
  background: #0c563d;
}

.btn[aria-disabled="true"] {
  pointer-events: none;
  background: #9aa89f;
}

.filename,
.checksum {
  margin: 0.55rem 0 0;
  word-break: break-all;
  font-size: 0.8rem;
}

.checksum {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.status {
  margin: 0 0 1rem;
  padding: 0.7rem 0.85rem;
  border-radius: 10px;
  font-size: 0.88rem;
}

.status.warn {
  background: var(--warn-bg);
  color: var(--warn-ink);
}

.status.ok {
  background: var(--ok-bg);
  color: var(--ok-ink);
}

.steps,
.devices {
  margin: 0;
  padding-left: 1.2rem;
}

.steps li + li,
.devices li + li {
  margin-top: 0.4rem;
}

footer {
  max-width: 28rem;
  margin: 1.25rem auto 0;
  text-align: center;
}

.noscript {
  max-width: 28rem;
  margin: 1rem auto 0;
}

@media (max-width: 420px) {
  .meta div {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }
}