body {
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', sans-serif;
  transition: background-color 0.3s;
}

.card {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.dark .card {
  background-color: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: none;
}

.glow { box-shadow: 0 0 24px rgba(249,115,22,0.3); }

.btn-orange {
  background: linear-gradient(135deg, #f97316, #ea580c);
  transition: all .18s;
}
.btn-orange:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(249,115,22,0.4);
}
.btn-orange:active:not(:disabled) { transform: translateY(0); }
.btn-orange:disabled { opacity: .4; cursor: not-allowed; }

/* アコーディオン */
.accordion-content {
  display: none;
}
.accordion-content.open {
  display: block;
}
.accordion-chevron {
  transition: transform 0.2s;
}
.accordion-chevron.open {
  transform: rotate(180deg);
}

/* モバイルメニュー */
#mobile-menu {
  display: none;
}
#mobile-menu.open {
  display: block;
}