/* ============================================
   Usage Guide Modal — Shared across all pages
   ============================================ */

.guide-btn {
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  margin-left: 10px;
  vertical-align: middle;
}

.guide-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.guide-modal {
  background: var(--surface, #fff);
  border-radius: 12px;
  width: 100%;
  max-width: 880px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}
.guide-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border, #e8e6e1);
  flex-shrink: 0;
}
.guide-modal-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}
.guide-modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--muted, #8a8a8a);
  padding: 0 4px;
  line-height: 1;
}
.guide-modal-close:hover { color: var(--ink, #2d2d2d); }
.guide-modal-body {
  padding: 24px;
  overflow-y: auto;
  font-size: 13px;
  line-height: 1.7;
}
.guide-modal-body .guide-intro {
  font-size: 14px;
  color: var(--stone, #555);
  margin: 0 0 20px;
  line-height: 1.7;
}
.guide-modal-body h3 {
  font-size: 15px;
  font-weight: 700;
  margin: 24px 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-light, #f0eeea);
}
.guide-modal-body h3:first-of-type { margin-top: 0; }
.guide-modal-body h4 {
  font-size: 13px;
  font-weight: 700;
  margin: 14px 0 4px;
  color: var(--stone, #555);
}
.guide-modal-body ul, .guide-modal-body ol {
  margin: 0 0 10px;
  padding-left: 20px;
}
.guide-modal-body li { margin-bottom: 4px; }
.guide-section {
  padding-left: 4px;
}
.guide-formula {
  padding: 8px 12px;
  background: var(--surface-alt);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
}
.guide-table {
  width: 100%;
  font-size: 12px;
  border-collapse: collapse;
  margin-top: 8px;
}
.guide-table th {
  text-align: left;
  padding: 4px 8px;
  border-bottom: 1px solid var(--border);
}
.guide-table td {
  padding: 4px 8px;
}

@media (max-width: 768px) {
  .guide-modal { max-width: 100%; max-height: 90vh; }
  .guide-modal-overlay { padding: 12px; }
}