/* ============================================
   Reusable UI components — buttons, chips,
   toasts, callouts, quizzes, scroll progress,
   forms.
   ============================================ */

/* ── Buttons ── */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-raised);
  color: var(--color-text);
  font-weight: var(--weight-medium);
  font-size: var(--text-base);
  text-decoration: none;
  box-shadow: var(--shadow-xs);
  transition:
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease,
    transform var(--duration-fast) var(--ease-out-quart),
    box-shadow var(--duration-normal) var(--ease-out-quart);
}

.btn:hover {
  background: var(--color-surface-sunken);
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: var(--gradient-brand);
  background-size: 180% 180%;
  background-position: 0% 50%;
  color: var(--color-text-inverse);
  border-color: transparent;
  box-shadow: var(--shadow-brand);
  transition:
    background-position var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-fast) var(--ease-out-quart),
    box-shadow var(--duration-normal) var(--ease-out-quart);
}

.btn--primary:hover {
  background-position: 100% 50%;
  transform: translateY(-1px);
  box-shadow: 0 14px 30px oklch(54% 0.23 275 / 0.32),
              0 4px 10px oklch(54% 0.23 275 / 0.18);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  box-shadow: none;
}

.btn--ghost:hover {
  background: var(--color-surface-sunken);
  box-shadow: var(--shadow-xs);
}

.btn--danger {
  background: var(--color-danger);
  color: var(--color-text-inverse);
  border-color: transparent;
  box-shadow: 0 4px 12px oklch(58% 0.2 28 / 0.28);
}

.btn--danger:hover {
  background: oklch(52% 0.22 28);
}

.btn--sm {
  min-height: 36px;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
}

.btn--block {
  width: 100%;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

/* ── Chip (header status) ── */
.app-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 34px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  box-shadow: var(--shadow-xs);
}

.app-chip::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 8px oklch(70% 0.14 180 / 0.6);
}

/* ── Toast ── */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--tabbar-height) + var(--safe-bottom) + var(--space-5));
  transform: translateX(-50%);
  z-index: 80;
  padding: var(--space-3) var(--space-5);
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  box-shadow: 0 8px 24px oklch(0% 0 0 / 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) ease, transform var(--duration-normal) ease;
}

.toast[data-visible="true"] {
  opacity: 1;
  transform: translateX(-50%) translateY(-4px);
}

.toast--error {
  background: var(--color-danger);
}

.toast--success {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

/* ── Scroll progress bar ── */
.scroll-progress {
  position: fixed;
  top: calc(var(--header-height) + var(--safe-top));
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  z-index: 35;
  pointer-events: none;
}

.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: var(--gradient-brand);
  box-shadow: 0 0 10px oklch(54% 0.23 275 / 0.5);
  transition: width 60ms linear;
}

body:not([data-route="lesson"]) .scroll-progress {
  display: none;
}

/* ── Callouts (shared) ── */
.callout {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-border-strong);
  background: var(--color-surface-sunken);
}

.callout__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
}

.callout__body > :first-child {
  margin-top: 0;
}

.callout__body > :last-child {
  margin-bottom: 0;
}

.callout--tip {
  background: var(--color-tip-bg);
  border-left-color: var(--color-tip-border);
}

.callout--activity {
  background: var(--color-activity-bg);
  border-left-color: var(--color-activity-border);
}

.callout--pro {
  background: var(--color-pro-bg);
  border-left-color: var(--color-pro-border);
}

.callout--warn {
  background: var(--color-warn-bg);
  border-left-color: var(--color-warn-border);
}

.callout--def {
  background: var(--color-def-bg);
  border-left-color: var(--color-def-border);
}

.callout--success {
  background: var(--color-success-bg);
  border-left-color: var(--color-success-border);
}

/* ── Quiz ── */
.quiz {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-raised);
}

.quiz__q {
  margin: 0 0 var(--space-4);
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  line-height: var(--leading-tight);
}

.quiz__options {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz__option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: transparent;
  width: 100%;
  text-align: left;
  transition: background var(--duration-fast) ease, border-color var(--duration-fast) ease;
}

.quiz__option:hover {
  background: var(--color-surface-sunken);
}

.quiz__option[data-state="correct"] {
  background: var(--color-success-bg);
  border-color: var(--color-success-border);
}

.quiz__option[data-state="wrong"] {
  background: var(--color-warn-bg);
  border-color: var(--color-warn-border);
}

.quiz__feedback {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-surface-sunken);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.quiz__feedback[hidden] {
  display: none;
}

/* ── Forms ── */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form__label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
}

.form__input,
.form__textarea,
.form__select {
  min-height: 44px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-raised);
  color: var(--color-text);
  box-shadow: var(--shadow-xs);
  transition: border-color var(--duration-fast) ease,
              box-shadow var(--duration-fast) ease,
              background var(--duration-fast) ease;
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.form__input:hover,
.form__textarea:hover,
.form__select:hover {
  border-color: var(--color-border-strong);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 4px oklch(54% 0.23 275 / 0.15);
}

.form__textarea {
  min-height: 88px;
  resize: vertical;
  font-family: inherit;
}

.form__hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.form__error {
  font-size: var(--text-sm);
  color: var(--color-danger);
}

/* ── Card ── */
.card {
  position: relative;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-xs);
  transition: transform var(--duration-normal) var(--ease-out-quart),
              box-shadow var(--duration-normal) var(--ease-out-quart),
              border-color var(--duration-fast) ease;
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-brand);
  box-shadow: var(--shadow-md);
}

.card--brand {
  background: var(--gradient-brand-soft);
  border-color: var(--color-border-brand);
}

.card__title {
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: -0.01em;
}

/* ── Pill ── */
.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--color-surface-sunken);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.pill--brand {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-color: transparent;
}

.pill--accent {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
  border-color: transparent;
}

.pill--violet {
  background: var(--color-violet-light);
  color: var(--color-violet);
  border-color: transparent;
}

/* ── App menu (header) ── */
.app-menu {
  display: flex;
  gap: var(--space-1);
}

.app-menu__item {
  background: none;
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  min-height: 36px;
}

.app-menu__item:hover {
  background: var(--color-surface-sunken);
  color: var(--color-text);
}

.app-menu__item[aria-current="true"] {
  color: var(--color-primary-dark);
  background: var(--color-primary-light);
  font-weight: var(--weight-bold);
}

.app-menu__item {
  position: relative;
  transition: color var(--duration-fast) ease,
              background var(--duration-fast) ease;
}

@media (max-width: 1023px) {
  .app-menu {
    display: none !important;
  }
}

/* ── PWA install button + iOS hint + update banner ── */
.pwa-install-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 36px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}

.pwa-install-btn[hidden] {
  display: none;
}

.ios-install-hint {
  position: fixed;
  left: var(--space-4);
  right: var(--space-4);
  bottom: calc(var(--safe-bottom) + var(--space-4));
  z-index: 80;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  box-shadow: 0 12px 32px oklch(0% 0 0 / 0.2);
  font-size: var(--text-sm);
}

.ios-install-hint[hidden] {
  display: none;
}

.ios-install-hint__close {
  float: right;
  background: none;
  border: none;
  font-size: 1.2rem;
  padding: 0 var(--space-2);
}

/* ── PWA install modal (mobile-first install prompt) ── */
.pwa-install-modal {
  position: fixed;
  inset: 0;
  z-index: 9000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.pwa-install-modal--visible {
  opacity: 1;
  pointer-events: auto;
}

.pwa-install-modal__backdrop {
  position: absolute;
  inset: 0;
  background: oklch(15% 0.02 280 / 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.pwa-install-modal__sheet {
  position: relative;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px 24px calc(env(safe-area-inset-bottom, 0px) + 24px);
  border-radius: 24px 24px 0 0;
  background: var(--color-surface-raised, #ffffff);
  color: var(--color-text, #0b0b14);
  box-shadow: 0 -12px 40px oklch(0% 0 0 / 0.3);
  transform: translateY(20px);
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
}

.pwa-install-modal--visible .pwa-install-modal__sheet {
  transform: translateY(0);
}

@media (min-width: 600px) {
  .pwa-install-modal {
    align-items: center;
    padding: 24px;
  }
  .pwa-install-modal__sheet {
    border-radius: 24px;
    padding-bottom: 24px;
  }
}

.pwa-install-modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: oklch(95% 0.005 280);
  color: oklch(30% 0.02 280);
  font-size: 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.pwa-install-modal__close:hover {
  background: oklch(90% 0.005 280);
}

.pwa-install-modal__appicon {
  display: flex;
  justify-content: center;
  margin-bottom: 12px;
}

.pwa-install-modal__appicon img {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  box-shadow: 0 6px 18px oklch(45% 0.18 280 / 0.4);
}

.pwa-install-modal__title {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text, #0b0b14);
}

.pwa-install-modal__lead {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.6;
  color: oklch(35% 0.02 280);
}

.pwa-install-benefits {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}

.pwa-install-benefits li {
  padding: 10px 14px;
  border-radius: 12px;
  background: oklch(96% 0.005 280);
  font-size: 14px;
  font-weight: 500;
}

.pwa-install-steps {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-align: left;
}

.pwa-install-steps li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  background: oklch(96% 0.005 280);
}

.pwa-install-steps__num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary, #4f46e5);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.pwa-install-steps li p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

.pwa-install-steps li strong {
  color: var(--color-primary, #4f46e5);
}

.pwa-share-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: var(--color-primary, #4f46e5);
  color: #fff;
  vertical-align: middle;
  margin: 0 2px;
}

.pwa-install-modal__steps-wrap {
  /* Android では手順は折りたたまれ、ボタン押下で出る */
  display: none;
}

.pwa-install-modal--show-steps .pwa-install-modal__steps-wrap {
  display: block;
}

.pwa-install-modal__note {
  margin: 12px 0 16px;
  padding: 10px 12px;
  border-radius: 10px;
  background: oklch(96% 0.01 80);
  color: oklch(40% 0.05 80);
  font-size: 12px;
  line-height: 1.5;
}

.pwa-install-modal__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.pwa-install-modal__primary,
.pwa-install-modal__secondary,
.pwa-install-modal__tertiary {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 120ms ease, opacity 120ms ease;
}

.pwa-install-modal__primary:active,
.pwa-install-modal__secondary:active,
.pwa-install-modal__tertiary:active {
  transform: scale(0.98);
}

.pwa-install-modal__primary {
  background: var(--color-primary, #4f46e5);
  color: #fff;
  box-shadow: 0 6px 18px oklch(45% 0.18 280 / 0.35);
}

.pwa-install-modal__primary:hover {
  background: var(--color-primary-dark, #3730a3);
}

.pwa-install-modal__secondary {
  background: oklch(95% 0.005 280);
  color: oklch(20% 0.02 280);
}

.pwa-install-modal__tertiary {
  background: transparent;
  color: oklch(50% 0.02 280);
  font-weight: 500;
  font-size: 13px;
  padding: 8px;
}

/* iOS 用：画面下部の Safari 共有ボタンに向かって伸びる矢印 */
.pwa-install-modal__arrow {
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-primary, #4f46e5);
  opacity: 0.85;
  animation: pwa-arrow-bounce 1.6s ease-in-out infinite;
}

.pwa-install-modal--ios .pwa-install-modal__sheet {
  /* iOS は共有ボタン下にある → 画面下部に近すぎないように余白を取る */
  margin-bottom: 60px;
}

@keyframes pwa-arrow-bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ダーク用 */
@media (prefers-color-scheme: dark) {
  .pwa-install-modal__sheet {
    background: oklch(20% 0.02 280);
    color: oklch(95% 0.005 280);
  }
  .pwa-install-modal__title {
    color: oklch(98% 0.005 280);
  }
  .pwa-install-modal__lead {
    color: oklch(75% 0.01 280);
  }
  .pwa-install-modal__close {
    background: oklch(28% 0.02 280);
    color: oklch(85% 0.005 280);
  }
  .pwa-install-modal__close:hover {
    background: oklch(34% 0.02 280);
  }
  .pwa-install-benefits li,
  .pwa-install-steps li {
    background: oklch(26% 0.02 280);
  }
  .pwa-install-modal__note {
    background: oklch(26% 0.04 80);
    color: oklch(85% 0.04 80);
  }
  .pwa-install-modal__secondary {
    background: oklch(28% 0.02 280);
    color: oklch(95% 0.005 280);
  }
  .pwa-install-modal__tertiary {
    color: oklch(70% 0.01 280);
  }
}

/* 既存のフローティングインストールボタンは新モーダルで代替するため非表示 */
.pwa-install {
  display: none !important;
}

/* ── Header update button (always visible) ── */
.app-header__update {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border, oklch(85% 0.005 280));
  background: var(--color-surface, transparent);
  color: var(--color-text-muted, oklch(40% 0.02 280));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease, transform 150ms ease;
  flex-shrink: 0;
}

.app-header__update:hover {
  background: var(--color-surface-raised, oklch(96% 0.005 280));
  color: var(--color-primary, #4f46e5);
  border-color: var(--color-primary, #4f46e5);
}

.app-header__update:active {
  transform: scale(0.94);
}

.app-header__update.is-loading svg {
  animation: app-update-spin 0.9s linear infinite;
}

@keyframes app-update-spin {
  to { transform: rotate(360deg); }
}

.app-header__update-dot {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: oklch(70% 0.18 30);
  box-shadow: 0 0 0 2px var(--color-surface, #fff);
}

@media (prefers-color-scheme: dark) {
  .app-header__update {
    border-color: oklch(35% 0.02 280);
  }
  .app-header__update:hover {
    background: oklch(28% 0.02 280);
  }
}

/* ── App info card (profile page) ── */
.app-info-card__hint {
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-muted, oklch(40% 0.02 280));
}

.app-info-card__meta {
  margin: 0 0 16px;
  padding: 12px 14px;
  border-radius: 12px;
  background: oklch(96% 0.005 280);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.app-info-card__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 13px;
  margin: 0;
}

.app-info-card__row dt {
  color: var(--color-text-muted, oklch(45% 0.02 280));
  font-weight: 500;
  flex-shrink: 0;
}

.app-info-card__row dd {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--color-text, oklch(20% 0.02 280));
  text-align: right;
  word-break: break-all;
}

.app-info-card__status {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.5;
}

.app-info-card__status[data-variant="success"] {
  background: oklch(95% 0.06 165);
  color: oklch(35% 0.12 165);
}

.app-info-card__status[data-variant="warn"] {
  background: oklch(96% 0.05 80);
  color: oklch(40% 0.10 80);
}

.app-info-card__status[data-variant="info"] {
  background: oklch(95% 0.04 250);
  color: oklch(40% 0.10 250);
}

.app-info-card .btn--primary.is-loading {
  pointer-events: none;
  opacity: 0.85;
}

@media (prefers-color-scheme: dark) {
  .app-info-card__meta {
    background: oklch(26% 0.02 280);
  }
  .app-info-card__row dd {
    color: oklch(95% 0.005 280);
  }
  .app-info-card__status[data-variant="success"] {
    background: oklch(28% 0.06 165);
    color: oklch(85% 0.10 165);
  }
  .app-info-card__status[data-variant="warn"] {
    background: oklch(28% 0.05 80);
    color: oklch(85% 0.08 80);
  }
  .app-info-card__status[data-variant="info"] {
    background: oklch(28% 0.04 250);
    color: oklch(85% 0.08 250);
  }
}

.sw-update-banner {
  position: fixed;
  top: calc(var(--safe-top) + var(--header-height) + var(--space-3));
  left: 50%;
  transform: translateX(-50%);
  z-index: 80;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 24px oklch(0% 0 0 / 0.15);
  font-size: var(--text-sm);
}

.sw-update-banner[hidden] {
  display: none;
}