/* ===== Modal / Overlay ===== */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  z-index: 900;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.overlay.show {
  display: block;
  opacity: 1;
}

.settings-panel {
  position: fixed;
  top: 0;
  left: -280px;
  width: 260px;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: rgba(15, 15, 20, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--border);
  transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
}

.settings-panel.open {
  left: 0;
}

.settings-panel__body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 16px;
}

.settings-panel__user {
  flex-shrink: 0;
  margin-top: auto;
  padding: 16px;
  border-top: 1px solid var(--border);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ===== User section (logged in) ===== */
.settings-user {
  animation: settingsUserIn 0.25s ease-out;
}

.settings-user__name {
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
  word-break: break-word;
}

.settings-user__plan {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.settings-user__plan--free {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.settings-user__plan--pro {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(6, 182, 212, 0.2));
  color: var(--accent);
  border: 1px solid rgba(139, 92, 246, 0.4);
}

.settings-user__tokens {
  font-size: 0.813rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.settings-user__tokens--zero {
  color: #f87171;
}

.settings-user__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-user__btn {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.813rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
}

.settings-user__btn:hover {
  background: var(--bg-card-hover);
  border-color: rgba(139, 92, 246, 0.3);
}

.settings-user__btn--logout {
  color: var(--text-muted);
  margin-top: 4px;
}

.settings-user__btn--logout:hover {
  border-color: rgba(239, 68, 68, 0.3);
  color: #f87171;
}

/* ===== User section (guest) ===== */
.settings-user--guest {
  text-align: center;
  animation: settingsUserIn 0.25s ease-out;
}

.settings-user--guest .settings-user__notice {
  font-size: 0.813rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.settings-user--guest .settings-user__btn-login {
  width: 100%;
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.settings-user--guest .settings-user__btn-login:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.35);
}

@keyframes settingsUserIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Upgrade Modal (既存overlay#overlayを使用) ===== */
.upgrade-modal {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  pointer-events: none;
}

.upgrade-modal.hidden {
  display: none !important;
}

.upgrade-modal__card {
  pointer-events: auto;
  position: relative;
  width: 100%;
  max-width: 360px;
  padding: 24px;
  background: rgba(15, 15, 20, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  animation: upgradeModalIn 0.25s ease-out;
}

@keyframes upgradeModalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.upgrade-modal__title {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
}

.upgrade-modal__text {
  margin: 0 0 20px;
  font-size: 0.938rem;
  color: var(--text-muted);
}

.upgrade-modal__actions {
  display: flex;
  gap: 12px;
  flex-direction: column-reverse;
}

@media (min-width: 380px) {
  .upgrade-modal__actions {
    flex-direction: row;
    justify-content: flex-end;
  }
}

.upgrade-modal__btn {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.upgrade-modal__btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: white;
}

.upgrade-modal__btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

.upgrade-modal__btn--secondary {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.upgrade-modal__btn--secondary:hover {
  background: var(--bg-card-hover);
  color: var(--text);
}

.upgrade-modal__btn--danger {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.upgrade-modal__btn--danger:hover {
  background: rgba(239, 68, 68, 0.22);
  border-color: rgba(239, 68, 68, 0.65);
}

/* ===== About Modal ===== */
.about-modal {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  pointer-events: none;
}

.about-modal.hidden {
  display: none !important;
}

.about-modal__card {
  pointer-events: auto;
  position: relative;
  width: 100%;
  max-width: 480px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: rgba(15, 15, 20, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  animation: upgradeModalIn 0.25s ease-out;
}

.about-modal__title {
  margin: 0 0 16px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  flex-shrink: 0;
}

.about-modal__body {
  flex: 1;
  overflow-y: auto;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}

.about-modal__body ul {
  margin: 6px 0 0 0;
  padding-left: 20px;
}

.about-modal__body li {
  margin-bottom: 4px;
}

.about-modal__body p {
  margin: 0 0 10px;
}

.about-modal__section {
  margin-bottom: 20px;
}

.about-modal__section:last-child {
  margin-bottom: 0;
}

.about-modal__section-title {
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 8px;
}

.about-modal__actions {
  flex-shrink: 0;
  display: flex;
  justify-content: flex-end;
}