:root {
  --bg: #f8f6f6;
  --surface: #ffffff;
  --text: #231416;
  --muted: #756568;
  --line: #ead6d8;
  --brand: #de0a15;
  --brand-soft: #ffe5e7;
  --dark: #2a1115;
  --shadow: 0 18px 42px rgba(64, 10, 15, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

.app-shell {
  display: grid;
  grid-template-columns: 264px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--dark);
  color: #fffafa;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 24px 18px;
}

.brand-logo-link {
  background: #ffffff;
  border-radius: 8px;
  display: block;
  padding: 10px;
}

.brand-logo-link img {
  display: block;
  height: auto;
  margin: 0 auto;
  max-height: 92px;
  object-fit: contain;
  width: 100%;
}

.nav {
  display: grid;
  gap: 8px;
}

.nav-item {
  background: transparent;
  border: 0;
  border-radius: 8px;
  color: #f3d7da;
  padding: 12px 14px;
  text-align: left;
  text-decoration: none;
}

.nav-item.is-active,
.nav-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.sidebar-note {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  line-height: 1.6;
  margin-top: auto;
  padding-top: 18px;
}

.sidebar-note p {
  color: #e8c4c7;
  font-size: 12px;
  margin: 0;
}

.main {
  min-width: 0;
  padding: 30px;
}

.manual-main {
  display: grid;
  gap: 18px;
}

.manual-hero,
.manual-section {
  max-width: 1080px;
  width: 100%;
}

.manual-hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 22px;
}

.manual-hero p {
  color: var(--brand);
  font-size: 12px;
  font-weight: 800;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.manual-hero h1 {
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 12px;
}

.manual-hero span {
  color: var(--muted);
  display: block;
  line-height: 1.7;
}

.manual-section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 22px;
}

.manual-section h2 {
  font-size: 22px;
  margin: 0 0 16px;
}

.manual-section h3 {
  margin: 0 0 8px;
}

.manual-section p,
.manual-section li {
  color: var(--muted);
  line-height: 1.7;
}

.purpose-grid,
.forecast-method,
.score-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.purpose-grid article,
.forecast-method article,
.score-grid article,
.menu-list article {
  background: #fffafa;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

.menu-list {
  display: grid;
  gap: 12px;
}

.menu-list strong {
  color: var(--brand);
}

.tag-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-grid span {
  background: var(--brand-soft);
  border-radius: 999px;
  color: var(--brand);
  font-weight: 800;
  padding: 8px 12px;
}

.lead {
  margin-top: 0;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 13px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--brand);
  font-size: 13px;
}

.step-list,
.notice-list {
  margin: 0;
  padding-left: 22px;
}

.notice-box {
  background: var(--brand-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-top: 16px;
  padding: 16px;
}

.notice-box strong {
  color: var(--brand);
}

.notice-box p {
  margin: 8px 0 0;
}

a {
  color: var(--brand);
}

@media (max-width: 760px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    padding: 14px;
    position: sticky;
    top: 0;
    z-index: 4;
  }

  .nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    overflow-x: auto;
  }

  .nav-item {
    white-space: nowrap;
  }

  .sidebar-note {
    display: none;
  }

  .main {
    padding: 18px;
  }

  .purpose-grid,
  .forecast-method,
  .score-grid {
    grid-template-columns: 1fr;
  }

  .manual-hero h1 {
    font-size: 29px;
  }

  table {
    display: block;
    overflow-x: auto;
  }
}