/* ===================================
   Kingfin JP - Subpage Stylesheet
   kingfin.com デザイン完全再現版
   =================================== */

.subpage-hero {
  padding: 140px 0 64px;
  background: var(--black);
  border-bottom: 1px solid rgba(255,255,255,0.07);
  position: relative;
  overflow: hidden;
}

.subpage-hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(255,210,26,0.05) 0%, transparent 70%);
  pointer-events: none;
}

.subpage-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--yellow-10);
  border: 1px solid var(--yellow-20);
  color: var(--yellow);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.subpage-hero__title {
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.subpage-hero__meta {
  font-size: 13px;
  color: var(--gray);
}

.subpage-content {
  padding: 80px 0;
  background: var(--black);
}

.subpage-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  align-items: start;
}

.subpage-body { max-width: 100%; }

.subpage-body h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
  margin: 40px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.subpage-body h2:first-child { margin-top: 0; }

.subpage-body h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
  margin: 24px 0 10px;
}

.subpage-body p {
  font-size: 14px;
  color: var(--gray-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-body ul, .subpage-body ol {
  margin: 0 0 16px 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.subpage-body li {
  font-size: 14px;
  color: var(--gray-light);
  line-height: 1.7;
  list-style: disc;
}
.subpage-body ol li { list-style: decimal; }

.subpage-body a {
  color: var(--yellow);
  text-decoration: underline;
  text-decoration-color: rgba(255,210,26,0.3);
  transition: all var(--transition);
}
.subpage-body a:hover {
  color: var(--yellow-hover);
  text-decoration-color: var(--yellow);
}

.subpage-body strong { color: var(--white); font-weight: 600; }

.subpage-body .highlight-box {
  background: var(--yellow-10);
  border: 1px solid var(--yellow-20);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 20px 0;
}
.subpage-body .highlight-box p { color: var(--yellow); margin: 0; font-size: 13px; }

/* ---- Sidebar TOC ---- */
.subpage-sidebar {
  position: sticky;
  top: 100px;
}
.toc-card {
  background: #111;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 24px;
}
.toc-card__title {
  font-size: 11px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.toc-link {
  display: block;
  font-size: 13px;
  color: var(--gray);
  padding: 7px 10px;
  border-radius: 6px;
  transition: all var(--transition);
  border-left: 2px solid transparent;
}
.toc-link:hover, .toc-link.active {
  color: var(--yellow);
  border-left-color: var(--yellow);
  background: var(--yellow-10);
}

/* ---- Back Link ---- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--gray);
  transition: color var(--transition);
  margin-bottom: 24px;
}
.back-link:hover { color: var(--white); }
.back-link i { font-size: 11px; }

@media (max-width: 1024px) {
  .subpage-layout { grid-template-columns: 1fr; }
  .subpage-sidebar { display: none; }
}
@media (max-width: 768px) {
  .subpage-hero { padding: 120px 0 48px; }
  .subpage-content { padding: 48px 0; }
}