:root {
  --blue:        #1565a8;
  --blue-light:  #2681d4;
  --blue-dark:   #0d4a82;
  --blue-pale:   #eef5fc;
  --amber:       #e07a00;
  --amber-hover: #c46a00;
  --text:        #1f2d3d;
  --text-muted:  #637080;
  --border:      #d4dfe9;
  --bg:          #f8fafc;
  --white:       #ffffff;
  /* legacy aliases */
  --navy: #1565a8; --navy-dark: #0d4a82; --navy-light: #2681d4; --navy-pale: #eef5fc;
  --teal: #1565a8; --teal-dark: #0d4a82; --teal-light: #2681d4; --teal-pale: #eef5fc;
  --orange: #e07a00; --orange-hover: #c46a00;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.9;
}
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-light); text-decoration: none; }

/* ── HEADER ── */
header {
  background: var(--white);
  border-bottom: 2px solid var(--border);
  box-shadow: 0 2px 12px rgba(21,101,168,0.08);
  position: sticky; top: 0; z-index: 100;
}
.header-top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 40px; max-width: 1100px; margin: 0 auto;
}
.logo {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.15rem; font-weight: 600;
  color: var(--blue-dark); letter-spacing: 0.04em;
}
.logo a { color: var(--blue-dark); }
.logo a:hover { text-decoration: none; }
.header-sub-links { display: flex; gap: 16px; font-size: 0.82rem; }
.header-sub-links a {
  color: var(--text-muted); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 20px; transition: all 0.2s;
}
.header-sub-links a:hover {
  background: var(--blue-pale); color: var(--blue); border-color: var(--blue-light);
  text-decoration: none;
}
.member-btn {
  background: var(--amber) !important; color: white !important;
  border-color: var(--amber) !important; border-radius: 20px !important;
}
.member-btn:hover {
  background: var(--amber-hover) !important; border-color: var(--amber-hover) !important;
}

/* ── NAV ── */
nav { background: var(--blue); }
nav ul {
  display: flex; list-style: none;
  max-width: 1100px; margin: 0 auto; padding: 0 40px; flex-wrap: wrap;
}
nav ul li a {
  display: block; color: rgba(255,255,255,0.9);
  padding: 13px 15px; font-size: 0.87rem; letter-spacing: 0.02em;
  transition: background 0.15s, border-bottom 0.15s;
  white-space: nowrap; text-decoration: none;
  border-bottom: 3px solid transparent;
}
nav ul li a:hover,
nav ul li a.active {
  background: var(--blue-dark); color: white;
  border-bottom: 3px solid var(--amber);
  text-decoration: none;
}

/* ── PAGE HEADER ── */
.page-header {
  background: linear-gradient(135deg, var(--blue-dark) 0%, var(--blue) 100%);
  color: white; padding: 40px; text-align: center;
  border-bottom: 3px solid var(--amber);
}
.page-header h1 {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.7rem; font-weight: 400; letter-spacing: 0.06em;
}

/* ── MAIN LAYOUT ── */
.main-wrap {
  max-width: 1100px; margin: 0 auto; padding: 50px 40px;
  display: grid; grid-template-columns: 1fr 280px; gap: 50px;
}
.main-wrap.full { grid-template-columns: 1fr; }
main section { margin-bottom: 48px; }

/* ── SECTION TITLES ── */
.section-title {
  font-family: 'Noto Serif JP', serif; font-size: 1.25rem; font-weight: 600;
  color: var(--blue-dark);
  border-left: 4px solid var(--amber);
  padding-left: 14px; margin-bottom: 20px; letter-spacing: 0.04em;
}
.sub-title {
  font-size: 1rem; font-weight: 600; color: var(--blue-dark);
  margin: 24px 0 12px; border-bottom: 1px solid var(--border); padding-bottom: 6px;
}

/* ── SIDEBAR ── */
.sidebar-card {
  background: white; border: 1px solid var(--border); border-radius: 8px;
  overflow: hidden; margin-bottom: 24px;
  box-shadow: 0 2px 10px rgba(21,101,168,0.07);
}
.sidebar-card-header {
  background: var(--blue-pale); color: var(--blue-dark);
  padding: 12px 18px; font-size: 0.9rem; font-weight: 600;
  border-bottom: 1px solid var(--border);
  border-left: 4px solid var(--amber);
}
.sidebar-card-body { padding: 18px; }
.sidebar-links { list-style: none; }
.sidebar-links li { border-bottom: 1px solid var(--border); }
.sidebar-links li:last-child { border-bottom: none; }
.sidebar-links a {
  display: block; padding: 10px 4px; font-size: 0.88rem;
  color: var(--text); transition: color 0.15s;
}
.sidebar-links a::before { content: '▸ '; color: var(--amber); font-size: 0.8rem; }
.sidebar-links a:hover { color: var(--blue); text-decoration: none; }

/* ── FOOTER ── */
footer {
  background: var(--blue-dark); color: rgba(255,255,255,0.82);
  padding: 40px; margin-top: 20px; border-top: 3px solid var(--amber);
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 20px;
}
.footer-logo {
  font-family: 'Noto Serif JP', serif; font-size: 1rem; font-weight: 600;
  color: white; letter-spacing: 0.04em;
}
.footer-nav { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-nav a { color: rgba(255,255,255,0.72); font-size: 0.82rem; }
.footer-nav a:hover { color: white; text-decoration: none; }
.footer-copy { font-size: 0.78rem; color: rgba(255,255,255,0.4); width: 100%; text-align: center; }

/* ── BUTTONS ── */
.btn-primary {
  display: inline-block; background: var(--amber); color: white;
  border: none; padding: 10px 24px; border-radius: 4px;
  font-size: 0.9rem; cursor: pointer; transition: background 0.2s;
}
.btn-primary:hover { background: var(--amber-hover); color: white; text-decoration: none; }
.btn-secondary {
  display: inline-block; background: white; color: var(--blue);
  border: 1px solid var(--blue); padding: 9px 22px; border-radius: 4px;
  font-size: 0.9rem; cursor: pointer; transition: all 0.2s;
}
.btn-secondary:hover { background: var(--blue); color: white; text-decoration: none; }
.btn-outline {
  display: inline-block; color: var(--blue); border: 1px solid var(--blue);
  padding: 9px 22px; border-radius: 4px; font-size: 0.88rem; transition: all 0.2s;
}
.btn-outline:hover { background: var(--blue); color: white; text-decoration: none; }

/* ── CONTENT ── */
.content-body { line-height: 2; }
.content-body h3 { font-size: 1.05rem; font-weight: 600; color: var(--blue); margin: 24px 0 8px; }
.content-body p { margin-bottom: 16px; }
.content-body ul, .content-body ol { padding-left: 1.5em; margin-bottom: 16px; }
.content-body li { margin-bottom: 6px; }

/* ── INFO BOX ── */
.info-box {
  background: var(--blue-pale); border: 1px solid var(--border);
  border-left: 4px solid var(--amber);
  border-radius: 4px; padding: 18px 20px; margin-bottom: 20px;
}

/* ── TABLES ── */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin-bottom: 24px; }
th { background: var(--blue); color: white; padding: 10px 14px; text-align: left; font-weight: 500; font-size: 0.88rem; }
td { padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:hover td { background: var(--blue-pale); }

/* ── SPONSOR ── */
.sponsor-placeholder {
  background: var(--blue-pale); border: 1px dashed var(--border);
  border-radius: 4px; padding: 24px; text-align: center;
  font-size: 0.8rem; color: var(--text-muted); margin-bottom: 12px;
}

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  .main-wrap { grid-template-columns: 1fr; padding: 30px 20px; gap: 30px; }
  .header-top { padding: 12px 20px; }
  nav ul { padding: 0 20px; }
  nav ul li a { padding: 11px 10px; font-size: 0.82rem; }
  .page-header { padding: 28px 20px; }
  .page-header h1 { font-size: 1.3rem; }
  footer { padding: 28px 20px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 14px; }
  .footer-nav { gap: 12px; }
}