:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --text: #1a1d26;
  --text-muted: #5c6370;
  --border: #e2e6ee;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --nav-width: 270px;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

/* ===== レイアウト ===== */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ===== サイドバー ===== */
nav.sidebar {
  width: var(--nav-width);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.5rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

nav.sidebar .site-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 0.2rem;
  color: var(--text);
}

nav.sidebar .project-name {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

nav.sidebar .nav-section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0.6rem 0.65rem 0.3rem;
  margin-top: 0.5rem;
}

nav.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0 0 0.5rem;
}

nav.sidebar li {
  margin-bottom: 0.15rem;
}

nav.sidebar a {
  display: block;
  padding: 0.42rem 0.65rem;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius);
  font-size: 0.88rem;
  line-height: 1.4;
}

nav.sidebar a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

nav.sidebar a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* ===== メインコンテンツ ===== */
main.content {
  flex: 1;
  padding: 2rem 2.5rem 3rem;
  max-width: 960px;
  min-width: 0;
}

.doc-meta {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border);
}

h1.page-title {
  margin: 0 0 0.5rem;
  font-size: 1.8rem;
  line-height: 1.3;
  color: var(--text);
}

h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 700;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--accent-soft);
  color: var(--text);
}

h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text);
}

h4 {
  margin: 1.2rem 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 700;
}

p {
  margin: 0.75rem 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== テーブル ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 0.9rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f1f5f9;
  font-weight: 600;
}

tbody tr:hover {
  background: #fafbff;
}

/* ===== リスト ===== */
ul, ol {
  margin: 0.75rem 0;
  padding-left: 1.5rem;
}

li {
  margin: 0.35rem 0;
}

/* ===== コードブロック ===== */
code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.87em;
  background: #f1f5f9;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: #d73a49;
}

pre {
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 1rem 0;
  border-left: 4px solid var(--accent);
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ===== 注記・ヒント ===== */
.note {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.92rem;
}

.tip {
  background: #f0fdf4;
  border-left: 4px solid #16a34a;
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.92rem;
}

.warn {
  background: #fffbeb;
  border-left: 4px solid #d97706;
  padding: 0.85rem 1rem;
  margin: 1rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.92rem;
}

/* ===== 関連リンクバナー ===== */
.related-links {
  background: #f8faff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  margin: 1rem 0 1.5rem;
  font-size: 0.88rem;
}

.related-links strong {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.4rem;
}

.related-links a {
  margin-right: 1rem;
}

/* ===== ステータスバッジ ===== */
.status-done   { color: #16a34a; font-weight: 600; }
.status-active { color: #2563eb; font-weight: 600; }
.status-planned{ color: #64748b; }
.status-partial{ color: #ca8a04; font-weight: 600; }

/* ===== インデックスカード ===== */
.doc-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.doc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.15s, border-color 0.15s;
}

.doc-card:hover {
  box-shadow: 0 4px 12px rgba(37,99,235,0.1);
  border-color: #93c5fd;
}

.doc-card a {
  font-weight: 600;
  font-size: 0.95rem;
  display: block;
  margin-bottom: 0.35rem;
}

.doc-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.doc-card .card-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.1rem 0.5rem;
  border-radius: 20px;
  margin-bottom: 0.5rem;
}

.tag-report   { background: #dbeafe; color: #1d4ed8; }
.tag-design   { background: #f3e8ff; color: #7c3aed; }
.tag-knowledge{ background: #dcfce7; color: #15803d; }
.tag-runbook  { background: #fef3c7; color: #b45309; }
.tag-robust   { background: #fee2e2; color: #b91c1c; }

/* ===== 水平線 ===== */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ===== blockquote ===== */
blockquote {
  border-left: 4px solid var(--accent);
  padding: 0.6rem 1rem;
  margin: 1rem 0;
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: #374151;
}

blockquote p { margin: 0; }

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }
  nav.sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  main.content {
    padding: 1.25rem 1rem 2rem;
  }
  .doc-cards {
    grid-template-columns: 1fr;
  }
}

/* ===== 開発ログ ===== */
.log-entry {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.2rem;
  margin: 1.25rem 0;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.log-entry h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--text);
}

.log-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.log-type {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.1rem 0.55rem;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.log-type-progress { background: #dbeafe; color: #1d4ed8; }
.log-type-issue    { background: #fee2e2; color: #b91c1c; border-left-color: #ef4444; }
.log-type-decision { background: #f3e8ff; color: #7c3aed; }
.log-type-change   { background: #fef3c7; color: #b45309; }
.log-type-note     { background: #f0fdf4; color: #15803d; }

.log-entry.issue {
  border-left-color: #ef4444;
}

/* tag-log カードタグ */
.tag-log { background: #e0f2fe; color: #0369a1; }

/* ===== ナレッジカード ===== */
.knowledge-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1rem;
  margin: 2rem 0;
  background: var(--surface);
  box-shadow: var(--shadow);
  scroll-margin-top: 1.5rem;
}

.knowledge-card h3 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.6rem;
}

.knowledge-card .k-section {
  margin: 0.85rem 0;
}

.knowledge-card .k-section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0.1rem 0.55rem;
  margin-bottom: 0.4rem;
  letter-spacing: 0.03em;
}

.knowledge-card .k-section-label.label-cause {
  color: #b91c1c;
  background: #fee2e2;
}

.knowledge-card .k-section-label.label-result {
  color: #15803d;
  background: #dcfce7;
}

.knowledge-card .k-section-label.label-expert {
  color: #7c3aed;
  background: #f3e8ff;
}

.knowledge-card .k-section-label.label-trigger {
  color: #b45309;
  background: #fef3c7;
}

.knowledge-card .k-section p {
  margin: 0.3rem 0 0;
  font-size: 0.93rem;
  line-height: 1.7;
}

/* ナレッジ目次テーブル */
.knowledge-toc {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.9rem;
}

.knowledge-toc th {
  background: #f1f5f9;
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
}

.knowledge-toc td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.knowledge-toc tr:hover td {
  background: var(--accent-soft);
}

.knowledge-toc .k-id {
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

.knowledge-toc .k-type {
  font-size: 0.78rem;
  padding: 0.1rem 0.5rem;
  border-radius: 20px;
  white-space: nowrap;
}

.k-type-error    { background: #fee2e2; color: #b91c1c; }
.k-type-design   { background: #dbeafe; color: #1d4ed8; }
.k-type-summary  { background: #dcfce7; color: #15803d; }
.k-type-ref      { background: #f3e8ff; color: #7c3aed; }
.k-type-ops      { background: #fef3c7; color: #b45309; }
.k-type-migrate  { background: #e0f2fe; color: #0369a1; }

/* 読み方ガイドテーブル */
.guide-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0 1.25rem;
  font-size: 0.9rem;
}

.guide-table th {
  background: #f1f5f9;
  padding: 0.5rem 0.75rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
  width: 30%;
}

.guide-table td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border);
}