/* Bootstrap variables + prefers-color-scheme */
:root {
  --bs-body-bg: #ffffff;
  --bs-body-color: #111827;
  --bs-secondary-color: #6b7280;
  --bs-border-color: #e5e7eb;
  --app-surface: #f9fafb;
  --app-surface-2: #ffffff;
  --app-line: #e5e7eb;
  --app-ok: #16a34a;
  --app-ng: #dc2626;
  --app-radius: 14px;
  --app-glow: rgba(34, 197, 94, .28);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bs-body-bg: #0b1220;
    --bs-body-color: #e5e7eb;
    --bs-secondary-color: #9ca3af;
    --bs-border-color: #253045;
    --app-surface: #101a2d;
    --app-surface-2: #0f172a;
    --app-line: #253045;
    --app-ok: #22c55e;
    --app-ng: #ef4444;
    --app-glow: rgba(34, 197, 94, .22);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bs-body-bg);
  color: var(--bs-body-color);
  line-height: 1.5;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans JP", "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

/* App layout */
.appShell {
  max-width: 900px;
  display: grid;
  gap: 16px;
}

/* Cards */
.card {
  border-color: var(--app-line);
  border-radius: var(--app-radius);
  background: var(--app-surface);
}

.card .card-body {
  padding: 16px;
}

/* Progress */
.progress--thin {
  height: 8px;
  border-radius: 999px;
  background: var(--app-surface-2);
  border: 1px solid var(--app-line);
}

.progress--thin .progress-bar {
  border-radius: 999px;
}

/* Japanese prompt */
.ja--primary {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
}

/* Answer area */
.answerArea {
  height: calc(1.4em * 3 + 24px);
  overflow-y: auto;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  padding: 12px;
  border: 1px dashed var(--app-line);
  border-radius: 12px;
  background: var(--app-surface-2);
  transition: box-shadow .18s ease, border-color .18s ease;
}

.answerArea.flash-ok {
  border-color: rgba(34, 197, 94, .75);
  box-shadow: 0 0 0 6px var(--app-glow);
}

.answerArea.flash-ng {
  border-color: rgba(239, 68, 68, .75);
  box-shadow: 0 0 0 6px rgba(239, 68, 68, .28);
}

/* Hint */
.hint {
  color: var(--bs-secondary-color);
  font-size: 13px;
}

.kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
  padding: 2px 6px;
  border: 1px solid var(--app-line);
  border-bottom-width: 2px;
  border-radius: 8px;
  background: var(--app-surface-2);
  color: var(--bs-body-color);
}

/* Word bank */
.bank {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Chips */
.chip {
  border: 1px solid var(--app-line);
  background: var(--app-surface-2);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
  font-size: 15px;
  transition: transform .04s ease, border-color .12s ease;
}

.chip:hover { border-color: #94a3b8; }
.chip:active { transform: translateY(1px); }

.chip[aria-disabled="true"] {
  opacity: .45;
  cursor: not-allowed;
  text-decoration: line-through;
}

.chip--correct {
  opacity: 0.6;
  font-weight: normal;
  cursor: default;
  border-color: var(--app-ok);
  background: rgba(34, 197, 94, 0.1);
}

.chip--matched {
  opacity: 1;
  font-weight: bold;
  border-color: var(--app-ok);
  background: rgba(34, 197, 94, 0.3);
}

/* Status */
.status {
  font-size: 14px;
  color: var(--bs-secondary-color);
}

.status.ok { color: var(--app-ok); font-weight: 700; }
.status.ng { color: var(--app-ng); font-weight: 700; }

/* Mobile dock */
.bankDock {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 1030;
  border: 1px solid var(--app-line);
  border-radius: 16px;
  background: var(--app-surface);
  box-shadow: 0 10px 30px rgba(0,0,0,.20);
  overflow: hidden;
}

.bankDock__bar {
  display: flex;
  align-items: center;
}

.bankDock__toggle {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.bankDock__meta {
  font-size: 13px;
  color: var(--bs-secondary-color);
}

.bankDock__body {
  padding: 12px 14px 14px;
  border-top: 1px solid var(--app-line);
}

.bankDock__body .bank {
  max-height: 220px;
  overflow-y: auto;
  padding-bottom: 2px;
}

.bankDock__placeholder {
  padding: 6px 0;
}

@media (max-width: 576px) {
  .appShell { padding-bottom: 92px; }
  .bankDesktop { display: none; }
  .chip { padding: 7px 11px; font-size: 14px; }
}

@media (max-width: 576px) {
  body.bankdock-open .appShell {
    padding-bottom: 340px;
  }
}

@media (min-width: 577px) {
  .bankDock { display: none; }
}

/* Footer */
.appFooter {
  margin: 24px auto 12px;
  max-width: 900px;
  padding: 0 16px;
}

.appFooter__inner {
  border-top: 1px solid var(--app-line);
  padding-top: 12px;
  text-align: center;
}

.appFooter__title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .2px;
  color: var(--bs-secondary-color);
}

.appFooter__desc {
  margin-top: 4px;
  font-size: 12px;
  color: var(--bs-secondary-color);
}

.sb-details {
  border-top: 1px solid rgba(0,0,0,.08);
  padding-top: .5rem;
}

.sb-summary {
  cursor: pointer;
  user-select: none;
  font-size: 0.9rem;
}

.sb-details__body p {
  line-height: 1.7;
}