:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #5c6672;
  --navy: #232f3e;
  --orange: #ff9900;
  --paper: #ffffff;
  --wash: #f5f7fa;
  --line: #d9e0e7;
}

* { box-sizing: border-box; }

html { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--wash);
  line-height: 1.65;
}

header {
  background: var(--navy);
  color: var(--paper);
  border-bottom: 4px solid var(--orange);
}

.header-inner,
main,
footer {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner { padding: 32px 0 28px; }

.brand {
  margin: 0;
  font-size: clamp(1.55rem, 4vw, 2.2rem);
  letter-spacing: -0.025em;
}

.subtitle { margin: 6px 0 0; color: #d9e2ec; }

main {
  margin-top: 28px;
  margin-bottom: 28px;
  padding: clamp(22px, 5vw, 48px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgb(35 47 62 / 8%);
}

h1, h2 { color: var(--navy); line-height: 1.25; }
h1 { margin-top: 0; font-size: clamp(1.8rem, 5vw, 2.5rem); }
h2 { margin-top: 2rem; font-size: 1.25rem; }

p, li { color: var(--ink); }
.meta, .muted { color: var(--muted); }

a { color: #005ea8; text-underline-offset: 0.18em; }
a:hover { color: #003f73; }

.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--orange);
  background: #fff7e6;
  border-radius: 4px 10px 10px 4px;
}

.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

.button {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 0;
  border-radius: 8px;
  background: var(--orange);
  color: #1b2631;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.button.secondary { background: var(--navy); color: var(--paper); }

code,
.code-box {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.code-box {
  overflow-wrap: anywhere;
  margin: 18px 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
  font-size: 0.86rem;
}

footer {
  padding: 6px 0 32px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 560px) {
  .header-inner, main, footer { width: min(100% - 20px, 860px); }
  main { margin-top: 10px; padding: 20px; border-radius: 10px; }
}