/* ============================================================
   Memory Mode — active-recall overlay panel.
   Desktop: right-side sliding panel. Mobile: bottom sheet.
   ============================================================ */

body.mem-open { overflow: hidden; }

.mem-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, #000 38%, transparent);
  backdrop-filter: blur(1.5px);
  z-index: 900;
  opacity: 0;
  animation: mem-fade-in var(--duration-normal, 200ms) var(--ease-out) forwards;
}

@keyframes mem-fade-in { to { opacity: 1; } }

.mem-panel {
  position: fixed;
  top: 0;
  right: 0;
  height: 100vh;
  width: min(460px, 100vw);
  z-index: 901;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: -12px 0 40px color-mix(in srgb, #000 18%, transparent);
  transform: translateX(100%);
  transition: transform 260ms var(--ease-out, cubic-bezier(0.22, 1, 0.36, 1));
}
.mem-panel.is-open { transform: translateX(0); }

.mem-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}
.mem-panel__title { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.mem-panel__brand { font-weight: var(--font-weight-bold); font-size: var(--font-size-md); }
.mem-panel__note {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.mem-panel__close {
  flex-shrink: 0;
  display: grid; place-items: center;
  width: 34px; height: 34px;
  color: var(--color-text-secondary);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.mem-panel__close:hover { background: var(--color-surface-2, var(--color-border)); color: var(--color-text-primary); }

.mem-panel__body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 18px 28px;
}

/* ── Loading ─────────────────────────────────────────────── */
.mem-loading { text-align: center; padding: 60px 16px; }
.mem-loading .ui-spinner { margin: 0 auto 18px; width: 40px; height: 40px; }
.mem-loading h3 { margin: 0 0 6px; }
.mem-loading p { margin: 0; color: var(--color-text-secondary); line-height: 1.6; }

/* ── Empty state ─────────────────────────────────────────── */
.mem-empty { text-align: center; padding: 48px 12px; }
.mem-empty__icon { font-size: 44px; margin-bottom: 10px; }
.mem-empty h3 { margin: 0 0 8px; }
.mem-empty p { margin: 0 0 20px; color: var(--color-text-secondary); line-height: 1.6; }

/* ── Progress ────────────────────────────────────────────── */
.mem-progress { margin-bottom: 18px; }
.mem-progress__meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.mem-progress__count { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); color: var(--color-text-secondary); }
.mem-progress__bar { height: 6px; background: var(--color-border); border-radius: 999px; overflow: hidden; }
.mem-progress__fill { height: 100%; background: var(--color-accent); border-radius: 999px; transition: width var(--duration-normal) var(--ease-out); }

.mem-chip {
  display: inline-block;
  padding: 3px 10px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: 999px;
  color: var(--color-accent);
  background: var(--color-accent-soft);
}
.mem-chip--date { color: #b7791f; background: color-mix(in srgb, #b7791f 15%, transparent); }
.mem-chip--article, .mem-chip--act { color: #7c3aed; background: color-mix(in srgb, #7c3aed 14%, transparent); }
.mem-chip--proper { color: #0e7490; background: color-mix(in srgb, #0e7490 14%, transparent); }

/* ── Question card ───────────────────────────────────────── */
.mem-card {
  padding: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  animation: mem-slide-up 220ms var(--ease-out);
}
@keyframes mem-slide-up { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.mem-sentence {
  margin: 0 0 18px;
  font-size: var(--font-size-lg);
  line-height: 1.75;
  color: var(--color-text-primary);
}
.mem-blank {
  display: inline-block;
  min-width: 60px;
  padding: 1px 10px;
  margin: 0 2px;
  text-align: center;
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-sm);
  vertical-align: baseline;
}
.mem-blank--empty {
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-bottom: 2px solid var(--color-accent);
}
.mem-blank--correct { color: #fff; background: var(--color-success, #1a7f4b); }
.mem-blank--partial { color: #fff; background: #b7791f; }
.mem-blank--incorrect { color: #fff; background: var(--color-danger, #c0392b); }

.mem-answer { display: flex; gap: 8px; }
.mem-answer__input {
  flex: 1;
  padding: 11px 14px;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--ease-out);
}
.mem-answer__input:focus { outline: none; border-color: var(--color-accent); }
.mem-answer__submit { flex-shrink: 0; }

/* ── Feedback ────────────────────────────────────────────── */
.mem-feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-border);
  animation: mem-slide-up 200ms var(--ease-out);
}
.mem-feedback--correct { border-left-color: var(--color-success, #1a7f4b); background: color-mix(in srgb, var(--color-success, #1a7f4b) 9%, transparent); }
.mem-feedback--partial { border-left-color: #b7791f; background: color-mix(in srgb, #b7791f 9%, transparent); }
.mem-feedback--incorrect { border-left-color: var(--color-danger, #c0392b); background: color-mix(in srgb, var(--color-danger, #c0392b) 8%, transparent); }
.mem-feedback__head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.mem-feedback__icon { font-size: var(--font-size-md); }
.mem-feedback__label { font-weight: var(--font-weight-semibold); }
.mem-feedback__your, .mem-feedback__answer { margin: 4px 0; font-size: var(--font-size-sm); }
.mem-feedback__your em { color: var(--color-text-secondary); font-style: italic; }
.mem-feedback__context {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}
.mem-feedback__why {
  margin: 8px 0 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  line-height: 1.6;
}

/* ── Navigation ──────────────────────────────────────────── */
.mem-nav { display: flex; gap: 8px; margin-top: 18px; }
.mem-nav__btn {
  flex: 1;
  padding: 10px 12px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.mem-nav__btn:hover:not(:disabled) { background: var(--color-surface-2, var(--color-border)); }
.mem-nav__btn:disabled { opacity: 0.45; cursor: default; }
.mem-nav__btn--primary {
  color: var(--color-text-inverse);
  background: var(--color-accent);
  border-color: var(--color-accent);
}
.mem-nav__btn--primary:hover { filter: brightness(1.05); background: var(--color-accent); }

/* ── Summary ─────────────────────────────────────────────── */
.mem-summary { animation: mem-slide-up 240ms var(--ease-out); }
.mem-summary__ring {
  width: 130px; height: 130px;
  margin: 12px auto 22px;
  border-radius: 50%;
  display: grid; place-content: center; text-align: center;
  border: 8px solid var(--color-border);
}
.mem-summary__ring.is-high { border-color: var(--color-success, #1a7f4b); }
.mem-summary__ring.is-mid { border-color: #b7791f; }
.mem-summary__ring.is-low { border-color: var(--color-danger, #c0392b); }
.mem-summary__pct { display: block; font-size: 34px; font-weight: var(--font-weight-bold); line-height: 1; }
.mem-summary__pct-lbl { font-size: var(--font-size-xs); color: var(--color-text-secondary); }

.mem-summary__stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 24px; }
.mem-stat {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 12px 4px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.mem-stat span { font-size: var(--font-size-lg); font-weight: var(--font-weight-bold); }
.mem-stat label { font-size: var(--font-size-xs); color: var(--color-text-secondary); }
.mem-stat--ok span { color: var(--color-success, #1a7f4b); }
.mem-stat--part span { color: #b7791f; }
.mem-stat--bad span { color: var(--color-danger, #c0392b); }

.mem-weak { margin-bottom: 24px; }
.mem-weak h3 { margin: 0 0 12px; font-size: var(--font-size-md); }
.mem-weak__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.mem-weak__list li {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px;
  font-size: var(--font-size-sm);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.mem-weak__none { color: var(--color-text-secondary); }

.mem-summary__actions { display: flex; flex-direction: column; gap: 10px; }

/* ── Mobile: bottom sheet ────────────────────────────────── */
@media (max-width: 640px) {
  .mem-panel {
    top: auto;
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    height: 88vh;
    border-left: none;
    border-top: 1px solid var(--color-border);
    border-radius: 18px 18px 0 0;
    box-shadow: 0 -12px 40px color-mix(in srgb, #000 22%, transparent);
    transform: translateY(100%);
  }
  .mem-panel.is-open { transform: translateY(0); }
  .mem-summary__actions { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  .mem-panel, .mem-card, .mem-feedback, .mem-summary { transition: none; animation: none; }
}