:root {
  --off-white: #faf9f7;
  --charcoal: #2d2d2d;
  --charcoal-dark: #1a1a1a;
  --accent: #b8866b;
  --accent-light: #d4a98a;
  --text-secondary: #6b6560;
  --text-light: #9a928a;
  --transition: 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  max-width: 900px; margin: 0 auto; padding: 12px 20px;
  font-size: .78rem; color: var(--text-light);
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--accent); }

/* ===== Article ===== */
.article { max-width: 780px; margin: 0 auto; padding: 48px 20px; }
.article-header { margin-bottom: 32px; }
.article-header h2 {
  font-size: 1.4rem; font-weight: 400; color: var(--charcoal);
  margin-bottom: 8px; line-height: 1.6;
}
.article-header .meta { font-size: .78rem; color: var(--text-light); margin-bottom: 16px; }
.article-header .tags { margin-bottom: 8px; }
.article-header .tag {
  display: inline-block; background: var(--off-white);
  border: 1px solid rgba(0,0,0,0.06); padding: 2px 10px;
  border-radius: 12px; font-size: .68rem; color: var(--text-light); margin: 2px;
}

/* ===== Content ===== */
.content h3 {
  font-size: 1.15rem; font-weight: 500; color: var(--charcoal);
  margin: 40px 0 20px; padding: 12px 16px;
  background: rgba(184,134,107,0.08);
  border-left: 4px solid var(--accent); border-bottom: none;
  border-radius: 0 6px 6px 0; letter-spacing: .06em;
}
.content h4 {
  font-size: .95rem; font-weight: 500; color: var(--accent);
  margin: 24px 0 8px;
}
.content p { margin-bottom: 16px; font-size: .88rem; color: var(--charcoal); }
.content ul, .content ol { margin: 0 0 16px 24px; font-size: .88rem; }
.content li { margin-bottom: 4px; }
.content a { color: var(--accent); }
.content a:hover { text-decoration: underline; }

.highlight-box {
  background: #fff; border-left: 3px solid var(--accent);
  padding: 16px 20px; border-radius: 0 4px 4px 0;
  margin: 20px 0; font-size: .88rem;
}
.highlight-box.point {
  background: var(--charcoal-dark); color: var(--accent-light);
  border-left: 3px solid var(--accent);
  font-size: .95rem; text-align: center; letter-spacing: .04em;
  border-radius: 4px; padding: 20px;
}
.highlight-box.formula {
  background: rgba(184,134,107,0.08); color: var(--charcoal);
  border: 1px solid rgba(184,134,107,0.2);
  text-align: center; font-size: 1.05rem; font-weight: 500;
  border-radius: 6px; padding: 24px; letter-spacing: .04em;
  line-height: 1.8;
}
.note-box {
  background: rgba(184,134,107,0.06); border: 1px solid rgba(184,134,107,0.15);
  border-radius: 6px; padding: 20px 24px;
  margin: 24px 0; font-size: .85rem; color: var(--text-secondary);
  line-height: 1.9;
}

.data-table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: .8rem; }
.data-table th, .data-table td { border: 1px solid rgba(0,0,0,0.08); padding: 8px 10px; text-align: center; }
.data-table th {
  background: var(--charcoal); color: rgba(255,255,255,0.7);
  font-weight: 400; font-size: .75rem;
}
.data-table td { background: #fff; }
.data-table tr.highlight td { background: #fdf8f0; font-weight: 500; }

.tips-nav-links {
  margin-top: 40px; padding-top: 24px;
  border-top: 1px solid rgba(0,0,0,0.06);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.tips-nav-links a { font-size: .82rem; color: var(--accent); }
.tips-nav-links a:hover { text-decoration: underline; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
.article { padding: 32px 20px; }
.data-table { font-size: .72rem; }
.data-table th, .data-table td { padding: 6px 4px; }
}