/* Oracle 19c 入門ガイド */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.8;
  color: #2b2a29;
  background: #f8f5f3;
}
a { color: #b63420; text-decoration: none; }
a:hover { color: #8e2617; text-decoration: underline; }

.site-header {
  background: linear-gradient(130deg, #8a1d10 0%, #c44729 100%);
  color: #fff;
  padding: 1rem 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header a { color: #ffe2d8; }
.site-header a:hover { color: #fff6f1; text-decoration: none; }
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.brand-group { display: flex; align-items: center; gap: 0.75rem; }
.site-logo-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.site-logo { width: 40px; height: 40px; display: block; }
.site-title { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.02em; color: #fff; }
.site-title small { font-size: 0.75rem; font-weight: 400; opacity: 0.9; margin-left: 0.5rem; color: #ffe2d8; }
.header-nav { display: flex; gap: 1.2rem; font-size: 0.9rem; }

.page-wrapper {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  gap: 2rem;
  padding: 2rem;
}
.sidebar { width: 290px; flex-shrink: 0; }
.main-content {
  flex: 1;
  min-width: 0;
  background: #fff;
  border-radius: 10px;
  padding: 2.3rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.toc {
  position: sticky;
  top: 5rem;
  background: #fff;
  border-radius: 8px;
  padding: 1.2rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
}
.toc h2 {
  font-size: 0.9rem;
  color: #a22f1d;
  border-bottom: 2px solid #e5987f;
  padding-bottom: 0.5rem;
  margin-bottom: 0.8rem;
}
.toc ul { list-style: none; }
.toc li { margin-bottom: 0.3rem; }
.toc a {
  display: block;
  padding: 0.25rem 0.5rem;
  font-size: 0.86rem;
  color: #5b5551;
  border-radius: 4px;
}
.toc a:hover { background: #fff1ec; color: #a22f1d; text-decoration: none; }
.toc .toc-h3 { padding-left: 1.2rem; font-size: 0.8rem; }

.main-content h1 {
  font-size: 1.8rem;
  color: #4a1911;
  border-bottom: 3px solid #e5987f;
  padding-bottom: 0.5rem;
  margin-bottom: 1.4rem;
}
.main-content h2 {
  font-size: 1.35rem;
  color: #3c2a26;
  margin-top: 2.2rem;
  margin-bottom: 0.9rem;
  padding-left: 0.8rem;
  border-left: 4px solid #e5987f;
}
.main-content h3 {
  font-size: 1.1rem;
  color: #5a4038;
  margin-top: 1.6rem;
  margin-bottom: 0.7rem;
}
.main-content p { margin-bottom: 0.9rem; }
.main-content ul, .main-content ol { margin-bottom: 1rem; padding-left: 1.5rem; }
.main-content li { margin-bottom: 0.35rem; }
.lead { font-size: 1.05rem; color: #4f4a47; margin-bottom: 1.5rem; }

.badge {
  display: inline-block;
  padding: 0.22rem 0.58rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  margin-right: 0.4rem;
  margin-bottom: 0.45rem;
}
.badge-db { background: #ffe2d8; color: #8e2617; }
.badge-sql { background: #fcead1; color: #8b5200; }
.badge-admin { background: #f1e9ff; color: #5e379b; }

pre {
  background: #311712;
  color: #ffe9e2;
  border-radius: 6px;
  padding: 1.1rem 1.3rem;
  overflow-x: auto;
  margin-bottom: 1.2rem;
  font-size: 0.88rem;
  line-height: 1.6;
  border-left: 4px solid #e5987f;
}
code {
  font-family: "JetBrains Mono", "Source Code Pro", "Consolas", monospace;
  font-size: 0.9em;
  background: #fff1ec;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
}
pre code { background: transparent; padding: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.2rem;
  font-size: 0.95rem;
}
th, td {
  border: 1px solid #e7d8d2;
  padding: 0.55rem 0.7rem;
  text-align: left;
}
th { background: #fff6f2; }

.info-box {
  border-left: 4px solid;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin: 1rem 0 1.2rem;
}
.note { background: #fff5f1; border-color: #cd6545; }
.tip { background: #f5fbf5; border-color: #3d9b4c; }
.warning { background: #fff9ed; border-color: #cc8e2f; }

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  margin-top: 1rem;
}
.card {
  border: 1px solid #ecdcd5;
  border-radius: 10px;
  padding: 0.9rem;
  background: linear-gradient(180deg, #ffffff 0%, #fffaf8 100%);
}
.card h3 { margin: 0 0 0.4rem 0; font-size: 1.03rem; }
.card p { margin: 0; color: #5b5551; font-size: 0.9rem; line-height: 1.65; }
.card-number {
  display: inline-block;
  min-width: 1.6rem;
  padding: 0.1rem 0.45rem;
  margin-bottom: 0.4rem;
  border-radius: 999px;
  background: #ffe2d8;
  color: #8e2617;
  font-size: 0.75rem;
  font-weight: 700;
}

.site-footer {
  text-align: center;
  color: #5b5551;
  font-size: 0.88rem;
  padding: 2rem 1rem;
}

@media (max-width: 1000px) {
  .page-wrapper { flex-direction: column; }
  .sidebar { width: 100%; }
  .toc { position: static; max-height: none; }
}
@media (max-width: 640px) {
  .site-header { padding: 0.85rem 1rem; }
  .page-wrapper { padding: 1rem; gap: 1rem; }
  .main-content { padding: 1.3rem; }
  .site-title small { display: block; margin-left: 0; }
}