:root {
  --paper: #fffaf4;
  --paper-deep: #f7eadc;
  --ink: #241b14;
  --muted: #6d6157;
  --accent: #ff7900;
  --accent-deep: #c94f00;
  --line: rgba(94, 56, 25, 0.16);
  --card: rgba(255, 255, 255, 0.82);
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 4%, rgba(255, 121, 0, 0.14), transparent 25rem),
    linear-gradient(155deg, var(--paper), #fff 54%, var(--paper-deep));
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  overflow-x: hidden;
}

a { color: var(--accent-deep); }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid rgba(255, 121, 0, 0.38); outline-offset: 4px; }

.shell {
  width: min(820px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 72px;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 8px 0 32px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 13px;
  color: #fff;
  background: var(--accent);
  box-shadow: 0 10px 24px rgba(201, 79, 0, 0.24);
}

nav { display: flex; flex-wrap: wrap; gap: 16px; font-size: 13px; }
nav a { color: var(--muted); text-decoration: none; }
nav a[aria-current="page"] { color: var(--accent-deep); font-weight: 700; }

main {
  min-width: 0;
  margin-top: 38px;
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
  box-shadow: 0 24px 70px rgba(77, 45, 19, 0.09);
  backdrop-filter: blur(16px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1 { margin: 0; font-size: clamp(30px, 6vw, 48px); line-height: 1.25; letter-spacing: -0.04em; }
.updated { margin: 10px 0 34px; color: var(--muted); font-size: 13px; }
h2 { margin: 36px 0 10px; font-size: 19px; line-height: 1.5; }
p, li { overflow-wrap: anywhere; font-size: 15px; }
ul { padding-left: 1.4em; }
li + li { margin-top: 6px; }

.lead { margin: 18px 0 0; color: var(--muted); font-size: 16px; }
.card {
  margin-top: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 250, 244, 0.72);
}
.card h2 { margin-top: 0; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  margin-top: 8px;
  padding: 0 20px;
  border-radius: 999px;
  color: #fff;
  background: var(--accent-deep);
  font-weight: 700;
  text-decoration: none;
}

footer { padding: 28px 4px 0; color: var(--muted); font-size: 12px; }

@media (max-width: 620px) {
  .masthead { align-items: flex-start; flex-direction: column; }
  main { margin-top: 24px; border-radius: 22px; }
}

@media (prefers-reduced-motion: no-preference) {
  main { animation: arrive 420ms ease-out both; }
  @keyframes arrive {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }
}