/* モーダルオーバーレイ (self-introduction 和モダン グラスモーフィズム) */
.modal-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(26, 26, 30, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-backdrop.is-active {
  display: flex;
}

.modal-dialog {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  width: 100%;
  max-width: 540px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalFadeIn 0.25s var(--ease-wa);
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(-6px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  border-bottom: 1px solid var(--color-line);
  background-color: var(--color-bg);
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-text);
}

.modal-title.theme-indigo { border-left: 4px solid #6366f1; padding-left: 10px; }
.modal-title.theme-forest { border-left: 4px solid var(--color-matcha); padding-left: 10px; }
.modal-title.theme-teal   { border-left: 4px solid #14b8a6; padding-left: 10px; }
.modal-title.theme-rose   { border-left: 4px solid var(--danger); padding-left: 10px; }
.modal-title.theme-amber  { border-left: 4px solid var(--warning); padding-left: 10px; }
.modal-title.theme-purple { border-left: 4px solid #a855f7; padding-left: 10px; }

.modal-close-btn {
  color: var(--color-text-muted);
  font-size: 1.35rem;
  line-height: 1;
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.modal-close-btn:hover {
  color: var(--color-text);
  background-color: var(--color-surface-2);
}

.modal-body {
  padding: 22px;
  max-height: 75vh;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 14px 22px;
  border-top: 1px solid var(--color-line);
  background-color: var(--color-bg);
}

.modal-footer--spread {
  justify-content: space-between;
}

.btn-group-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.auth-toggle-link {
  font-family: var(--font-body);
  font-size: 0.86rem;
  color: var(--color-text-muted);
  margin-top: 12px;
  text-align: center;
}

.auth-toggle-link a {
  color: var(--color-matcha);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.auth-toggle-link a:hover {
  color: var(--color-matcha-light);
}

/* 授業詳細モーダル内スタイル */
.course-detail-meta-box {
  background-color: var(--bg-input);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 20px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.course-detail-meta-box strong {
  color: var(--color-text);
  font-family: var(--font-display);
}

.course-detail-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.course-detail-subtitle {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-text);
}

/* トースト通知 (和モダン スライドアップ & アクセント) */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 290px;
  padding: 12px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  animation: toastSlideUp 0.3s var(--ease-wa);
}

@keyframes toastSlideUp {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.toast-success {
  border-left: 4px solid var(--color-matcha);
}
.toast-error {
  border-left: 4px solid var(--danger);
}
.toast-info {
  border-left: 4px solid var(--info);
}