:root {
  --sgc-ink: #1f2933;
  --sgc-muted: #52606d;
  --sgc-line: #d9e2ec;
  --sgc-accent: #0b5cad;
  --sgc-bg: #ffffff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--sgc-bg);
  color: var(--sgc-ink);
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.7;
}

.sgc-header,
.sgc-footer {
  border-bottom: 1px solid var(--sgc-line);
}

.sgc-footer {
  border-bottom: 0;
  border-top: 1px solid var(--sgc-line);
  font-size: 0.875rem;
  color: var(--sgc-muted);
}

.sgc-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

.sgc-brand {
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
  color: var(--sgc-ink);
}

.sgc-nav a {
  margin-left: 1rem;
  color: var(--sgc-accent);
  text-decoration: none;
}

.sgc-nav a:hover {
  text-decoration: underline;
}

.sgc-main {
  min-height: 60vh;
  padding: 2rem 0;
}

.sgc-notice {
  border: 1px solid var(--sgc-line);
  border-left: 4px solid var(--sgc-accent);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
  background: #f5f9fd;
}

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

.sgc-table th,
.sgc-table td {
  border: 1px solid var(--sgc-line);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.sgc-table th {
  width: 10rem;
  background: #f5f7fa;
  font-weight: 600;
}