:root {
  color-scheme: light;
  --bg: #f5efe4;
  --paper: rgba(255, 252, 245, 0.9);
  --card: #fffdf8;
  --card-strong: #f7f0e2;
  --text: #1f1d1a;
  --muted: #706457;
  --line: rgba(96, 76, 51, 0.15);
  --accent: #a24c2f;
  --accent-strong: #7f3218;
  --shadow: 0 24px 70px rgba(60, 42, 24, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(224, 176, 111, 0.28), transparent 28rem),
    linear-gradient(180deg, #f3eadb 0%, #f8f3ea 40%, #fdfaf4 100%);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
}

h1,
h2,
h3,
strong {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
}

button,
input,
textarea,
select {
  font: inherit;
}

.page-shell {
  padding: 24px 0 56px;
}

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.page-header {
  margin-bottom: 28px;
}

.eyebrow,
.section-label {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-header h1 {
  margin: 0;
  max-width: 16ch;
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  line-height: 1.08;
}

.lead {
  max-width: 60rem;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.layout {
  display: grid;
  gap: 24px;
}

.hero-panel,
.content-panel,
.archive-panel {
  min-width: 0;
}

.hero-panel {
  display: grid;
  gap: 18px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(255, 249, 240, 0.96), rgba(246, 234, 211, 0.9)),
    var(--paper);
  box-shadow: var(--shadow);
}

.hero-copy h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3.2vw, 3rem);
  line-height: 1.18;
}

.hero-summary {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.8;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.stat-card,
.card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--card);
}

.stat-card {
  padding: 16px 18px;
}

.stat-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.82rem;
}

.inset-card {
  padding: 22px;
  background: rgba(255, 253, 248, 0.82);
}

.hero-highlights ul {
  margin: 0 0 18px;
  padding-left: 18px;
  line-height: 1.8;
}

.primary-action {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  color: #fffaf5;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease;
  box-shadow: 0 10px 24px rgba(127, 50, 24, 0.22);
}

.primary-action:hover,
.primary-action:focus-visible {
  transform: translateY(-1px);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 1.8rem;
}

.content-panel .card {
  padding: 28px;
  box-shadow: 0 18px 40px rgba(66, 50, 35, 0.08);
}

.archive-panel {
  align-self: start;
}

.stack {
  display: grid;
  gap: 14px;
}

.brief-card {
  width: 100%;
  display: grid;
  gap: 8px;
  padding: 18px;
  border: 1px solid rgba(96, 76, 51, 0.14);
  border-radius: 20px;
  background: rgba(255, 252, 245, 0.86);
  text-align: left;
  color: inherit;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.brief-card:hover,
.brief-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(162, 76, 47, 0.36);
  box-shadow: 0 12px 30px rgba(70, 45, 24, 0.1);
}

.brief-card.active {
  border-color: rgba(162, 76, 47, 0.48);
  background: linear-gradient(180deg, rgba(255, 248, 238, 0.98), rgba(247, 239, 227, 0.98));
  box-shadow: 0 18px 34px rgba(90, 61, 38, 0.12);
}

.brief-card-date,
.brief-card-meta {
  color: var(--muted);
  font-size: 0.86rem;
}

.brief-card strong {
  font-size: 1.15rem;
  line-height: 1.45;
}

.brief-card-summary {
  color: #4f463d;
  font-size: 0.95rem;
  line-height: 1.65;
}

.muted {
  color: var(--muted);
}

.markdown {
  font-size: 1rem;
  line-height: 1.9;
}

.markdown h1 {
  margin-top: 0;
  font-size: 2rem;
}

.markdown h2 {
  margin-top: 2rem;
  padding-top: 1.6rem;
  border-top: 1px solid rgba(96, 76, 51, 0.12);
  font-size: 1.4rem;
}

.markdown h3 {
  margin-top: 1.5rem;
  font-size: 1.1rem;
}

.markdown p,
.markdown ul {
  margin: 0.75rem 0 0;
}

.markdown a {
  color: var(--accent-strong);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.2em;
}

.topic-card {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(96, 76, 51, 0.12);
}

.topic-card:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.meta-list {
  list-style: none;
  padding-left: 0;
}

.meta-row {
  display: grid;
  grid-template-columns: minmax(5.5rem, 7rem) 1fr;
  gap: 0.9rem;
  align-items: start;
}

.meta-label {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.meta-value {
  min-width: 0;
  word-break: break-word;
}

.importance-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.62rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.importance-high {
  color: #8a3b12;
  background: #fde7d8;
}

.importance-medium {
  color: #1d4ed8;
  background: #dbeafe;
}

.importance-low {
  color: #475569;
  background: #e2e8f0;
}

@media (min-width: 960px) {
  .layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.85fr);
    grid-template-areas:
      "hero hero"
      "content archive";
    align-items: start;
  }

  .hero-panel {
    grid-area: hero;
    grid-template-columns: minmax(0, 1.3fr) minmax(300px, 0.9fr);
    align-items: start;
  }

  .content-panel {
    grid-area: content;
  }

  .archive-panel {
    grid-area: archive;
    position: sticky;
    top: 20px;
  }
}

@media (max-width: 959px) {
  .page-shell {
    padding-top: 16px;
  }

  .container {
    width: min(100% - 24px, 860px);
  }

  .hero-panel,
  .content-panel .card {
    padding: 22px;
  }

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

@media (max-width: 640px) {
  .page-header h1 {
    max-width: none;
    font-size: 2.3rem;
  }

  .lead,
  .hero-summary,
  .markdown {
    font-size: 0.96rem;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .brief-card {
    padding: 16px;
  }

  .content-panel .card,
  .hero-panel {
    border-radius: 20px;
  }

  .meta-row {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }
}