:root {
  --bg: #f4ede4;
  --surface: #fffaf3;
  --surface-soft: #f8efe3;
  --ink: #1f1711;
  --ink-soft: #5e5346;
  --ink-mute: #857768;
  --line: #d9c8b4;
  --accent: #be5b24;
  --accent-soft: rgba(190, 91, 36, 0.1);
  --warn-bg: #fff2df;
  --warn-line: #efbb74;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --shadow: 0 18px 44px rgba(32, 24, 18, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3.2rem;
  z-index: 20;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: #fffaf3;
  font-size: 0.9rem;
  font-weight: 700;
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: 1rem;
}

body {
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(243, 201, 140, 0.4), transparent 24%),
    linear-gradient(180deg, #f8f2e9, var(--bg));
  line-height: 1.85;
  letter-spacing: 0.03em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  width: min(calc(100% - 2rem), 960px);
  margin: 0 auto;
}

.page {
  padding: 2rem 0 4rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  color: var(--ink-mute);
  font-size: 0.9rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 8px rgba(190, 91, 36, 0.12);
}

.panel {
  background: rgba(255, 250, 243, 0.9);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0 1.6rem;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.35rem 0.8rem;
  border: 1px solid rgba(190, 91, 36, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 700;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 2rem;
  height: 1px;
  background: currentColor;
  opacity: 0.8;
}

h1, h2, h3 {
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.3;
  margin-bottom: 0.8rem;
}

h2 {
  font-size: 1.2rem;
  line-height: 1.55;
  margin-bottom: 0.9rem;
}

p, li, dd {
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.lead {
  margin-bottom: 1.5rem;
}

.notice {
  margin: 1.2rem 0 1.6rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--warn-line);
  border-radius: var(--radius-lg);
  background: var(--warn-bg);
}

.notice strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--ink);
  font-size: 0.95rem;
}

.section + .section {
  margin-top: 2rem;
}

.section-title {
  margin-bottom: 0.7rem;
  font-size: 1.1rem;
}

.card {
  padding: 1.2rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
}

.card p + p,
.card ul,
.card ol {
  margin-top: 0.7rem;
}

.stack {
  display: grid;
  gap: 1rem;
}

.grid-two {
  display: grid;
  gap: 1rem;
}

.def-list {
  display: grid;
  gap: 0.9rem;
}

.row {
  display: grid;
  gap: 0.3rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(217, 200, 180, 0.65);
}

.row:first-child {
  border-top: 1px solid rgba(217, 200, 180, 0.65);
}

dt {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 800;
}

dd {
  line-height: 1.85;
}

ul {
  padding-left: 1.1rem;
}

ol {
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.4rem;
}

.checklist,
.note-list {
  padding-left: 1.1rem;
}

.checklist li::marker {
  color: var(--accent);
}

.page-nav {
  display: grid;
  gap: 0.85rem;
}

.page-nav a {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(217, 200, 180, 0.82);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-weight: 700;
}

.page-nav a span {
  color: var(--ink-soft);
  font-size: 0.84rem;
  font-weight: 500;
  line-height: 1.6;
}

.page-nav a::after {
  content: "→";
  color: var(--accent);
  font-weight: 800;
}

.micro-copy {
  color: var(--ink-mute);
  font-size: 0.82rem;
  line-height: 1.7;
}

.key-points {
  display: grid;
  gap: 0.75rem;
}

.key-point {
  padding: 0.95rem 1rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 18px 18px 0;
  background: rgba(255, 255, 255, 0.74);
}

.key-point strong {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--ink);
  font-size: 0.95rem;
}

.small {
  color: var(--ink-mute);
  font-size: 0.84rem;
}

.link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.1rem;
  margin-top: 1.4rem;
  font-size: 0.9rem;
}

.link-list a {
  color: var(--accent);
  font-weight: 700;
}

footer {
  margin-top: 1.8rem;
  color: var(--ink-mute);
  font-size: 0.82rem;
}

code {
  padding: 0.12rem 0.32rem;
  border-radius: 6px;
  background: rgba(31, 23, 17, 0.06);
  color: var(--ink);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.88em;
}

@media (min-width: 760px) {
  .grid-two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .wrap {
    width: min(calc(100% - 1rem), 960px);
  }

  .page {
    padding: 1rem 0 2rem;
  }

  .topbar {
    flex-direction: column;
    align-items: start;
  }

  .panel {
    padding: 1.3rem 1rem;
  }
}