/* ============================================================
   Spaced-repetition flashcards — review modal + inline add.
   Light + dark via style.css variables (dark = html[data-theme="dark"]).
   Self-contained: everything is scoped under .fc-*.
   ============================================================ */

/* ---- overlay + modal (mirrors .tasks-qa-overlay) ---- */
.fc-overlay {
  position: fixed; inset: 0; z-index: 240;
  background: rgba(15, 15, 15, 0.5);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 80px 16px 24px;
}
.fc-modal {
  width: 560px; max-width: 100%;
  background: var(--bg-modal); border-radius: 12px;
  box-shadow: var(--shadow-popover);
  display: flex; flex-direction: column;
  color: var(--text); font-family: var(--font);
  animation: fc-in 0.13s ease;
  overflow: hidden;
}
@keyframes fc-in { from { opacity: 0; transform: scale(0.98) translateY(4px); } }

/* ---- header ---- */
.fc-head {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
}
.fc-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 15.5px; font-weight: 700; color: var(--text);
}
.fc-title .ic { color: var(--text-light); }
.fc-progress {
  margin-left: auto; font-size: 12.5px; color: var(--text-faint);
  background: var(--bg-hover); border-radius: 12px; padding: 2px 10px;
  white-space: nowrap;
}
.fc-progress:empty { display: none; }
.fc-close {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 7px; color: var(--text-light);
  flex-shrink: 0;
}
.fc-close:hover { background: var(--bg-hover); color: var(--text); }

/* ---- body ---- */
.fc-body {
  padding: 20px 18px 18px;
  display: flex; flex-direction: column; gap: 14px;
}

/* ---- card stage (front / back faces) ---- */
.fc-stage {
  display: flex; flex-direction: column; gap: 0;
  min-height: 150px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg);
  overflow: hidden;
}
.fc-face {
  padding: 22px 22px;
  font-size: 17px; line-height: 1.5; color: var(--text);
  white-space: pre-wrap; word-break: break-word;
  text-align: center;
  display: flex; align-items: center; justify-content: center;
  min-height: 74px; flex: 1;
}
.fc-front { font-weight: 600; }
.fc-back {
  border-top: 1px dashed var(--border-strong);
  background: var(--bg-callout);
  font-size: 16px; color: var(--text-light);
}
.fc-face.hidden { display: none; }

/* ---- show-answer bar ---- */
.fc-actions { display: flex; justify-content: center; }
.fc-actions.hidden { display: none; }
.fc-show {
  width: 100%; padding: 11px 18px;
  font-size: 14.5px; font-weight: 600; font-family: var(--font);
  color: #fff; background: var(--accent); border-radius: 9px;
}
.fc-show:hover { background: var(--accent-hover); }

/* ---- grade buttons (Again / Hard / Good / Easy) ---- */
.fc-grades {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px;
}
.fc-grades.hidden { display: none; }
.fc-grade {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 9px 6px; border-radius: 9px; font-family: var(--font);
  border: 1px solid var(--border-strong); background: var(--bg-input);
  color: var(--text); cursor: pointer;
  transition: background 0.12s, border-color 0.12s, transform 0.05s;
}
.fc-grade:hover { background: var(--bg-hover); border-color: var(--border-strong); }
.fc-grade:active { transform: translateY(1px); }
.fc-grade-label { font-size: 13.5px; font-weight: 600; }
.fc-grade-ivl { font-size: 11.5px; color: var(--text-faint); }
.fc-grade.again { color: var(--danger); border-color: rgba(235, 87, 87, 0.4); }
.fc-grade.again:hover { background: rgba(235, 87, 87, 0.1); }
.fc-grade.easy { color: var(--accent); border-color: rgba(91, 91, 214, 0.4); }
.fc-grade.easy:hover { background: rgba(91, 91, 214, 0.1); }

/* ---- done / empty state ---- */
.fc-done {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 26px 12px 12px; text-align: center;
}
.fc-done-glyph {
  display: inline-flex; align-items: center; justify-content: center;
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--bg-hover); color: var(--accent); margin-bottom: 4px;
}
.fc-done-title { font-size: 18px; font-weight: 700; color: var(--text); }
.fc-done-sub { font-size: 13.5px; color: var(--text-light); }
.fc-done-actions { display: flex; gap: 10px; margin-top: 14px; }

/* ---- inline add-card form ---- */
.fc-add { display: flex; flex-direction: column; gap: 10px; }
.fc-add-input {
  width: 100%; padding: 10px 12px; font-size: 14px; font-family: var(--font);
  border: 1px solid var(--border-strong); border-radius: 8px;
  background: var(--bg-input); color: var(--text); outline: none;
  resize: vertical; line-height: 1.5;
}
.fc-add-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(91, 91, 214, 0.18); }
.fc-add-input::placeholder { color: var(--text-placeholder); }
.fc-add-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* ---- shared buttons ---- */
.fc-primary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; font-size: 14px; font-weight: 500; font-family: var(--font);
  color: #fff; background: var(--accent); border-radius: 8px; white-space: nowrap;
}
.fc-primary:hover { background: var(--accent-hover); }
.fc-primary:disabled { opacity: 0.6; cursor: default; }
.fc-secondary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; font-size: 14px; font-family: var(--font); color: var(--text-light);
  border: 1px solid var(--border-strong); border-radius: 8px; background: transparent;
}
.fc-secondary:hover { background: var(--bg-hover); color: var(--text); }

/* ---- sidebar "Review" due badge (rendered by the host in #btn-review) ---- */
#review-due-badge {
  margin-left: auto; font-size: 11px; font-weight: 600; line-height: 16px;
  min-width: 16px; text-align: center; padding: 0 5px;
  color: #fff; background: var(--accent); border-radius: 9px;
}
#review-due-badge.hidden { display: none; }

/* ---- responsive ---- */
@media (max-width: 560px) {
  .fc-overlay { padding: 40px 10px 16px; }
  .fc-modal { width: 100%; }
  .fc-grades { gap: 6px; }
  .fc-grade { padding: 8px 3px; }
  .fc-grade-label { font-size: 12.5px; }
}

/* Sidebar "Review" due-count badge (mirrors .inbox-badge). */
.sb-badge {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 17px; height: 17px; padding: 0 5px; margin-left: auto;
  border-radius: 9px;
  font-size: 10.5px; font-weight: 700; line-height: 1; font-family: var(--font);
  color: #fff; background: var(--accent);
}
.sb-badge.hidden { display: none; }

/* ============================================================
   Flashcards MANAGER (decks / categories, browse, edit)
   Scoped under .fcm-* — the "Review" home screen.
   ============================================================ */
.fcm-overlay {
  position: fixed; inset: 0; z-index: 240;
  background: rgba(15, 15, 15, 0.5);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 64px 16px 24px;
}
.fcm-modal {
  width: 640px; max-width: 100%; max-height: 84vh;
  background: var(--bg-modal); border-radius: 14px;
  box-shadow: var(--shadow-popover);
  display: flex; flex-direction: column;
  color: var(--text); font-family: var(--font);
  overflow: hidden; position: relative;
  animation: fc-in 0.13s ease;
}

/* header */
.fcm-head {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 14px 14px 18px; border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 6%, var(--bg-modal)), var(--bg-modal));
}
.fcm-title { display: flex; align-items: center; gap: 9px; font-size: 15.5px; font-weight: 700; }
.fcm-title .ic { color: var(--accent); }
.fcm-head-spacer { flex: 1; }
.fcm-iconbtn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 7px;
  color: var(--text-light); background: none; border: none; cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.fcm-iconbtn:hover { background: var(--bg-hover); color: var(--text); }
.fcm-iconbtn.sm { width: 28px; height: 28px; }
.fcm-iconbtn.danger:hover { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); }

.fcm-body { padding: 16px 18px 20px; overflow-y: auto; min-height: 0; }

/* buttons */
.fcm-primary, .fcm-secondary {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 8px 14px; border-radius: 8px; cursor: pointer;
  font-family: var(--font); font-size: 13px; font-weight: 600;
  border: 1px solid transparent; transition: filter 0.12s, background 0.12s, opacity 0.12s;
}
.fcm-primary { color: #fff; background: var(--accent); }
.fcm-primary:hover { filter: brightness(1.06); }
.fcm-primary:disabled { opacity: 0.45; cursor: default; }
.fcm-secondary { color: var(--text-light); background: var(--bg); border-color: var(--border-strong); }
.fcm-secondary:hover { background: var(--bg-hover); color: var(--text); }
.fcm-danger-btn {
  padding: 8px 14px; border-radius: 8px; cursor: pointer; font-size: 13px; font-weight: 600;
  color: var(--danger); background: none; border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--border));
  margin-right: auto;
}
.fcm-danger-btn:hover { background: var(--danger); color: #fff; }

/* hero (review all) */
.fcm-hero {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 18px; border-radius: 12px; margin-bottom: 18px;
  background: color-mix(in srgb, var(--accent) 8%, var(--bg-callout));
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--border));
}
.fcm-hero-info { flex: 1; display: flex; align-items: baseline; gap: 8px; }
.fcm-hero-n { font-size: 30px; font-weight: 800; line-height: 1; color: var(--accent); font-variant-numeric: tabular-nums; }
.fcm-hero-l { font-size: 13.5px; color: var(--text-light); }
.fcm-hero-btn { padding: 10px 18px; font-size: 13.5px; }

/* section head */
.fcm-sec-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.fcm-sec-title { font-size: 12px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-faint); }
.fcm-newdeck {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 11px; border-radius: 7px; cursor: pointer;
  font-size: 12.5px; font-weight: 600; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}
.fcm-newdeck:hover { background: color-mix(in srgb, var(--accent) 18%, transparent); }

/* deck grid */
.fcm-decks { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.fcm-deck {
  position: relative; display: flex; align-items: center; gap: 12px;
  padding: 13px 14px; border-radius: 11px; text-align: left; cursor: pointer;
  background: var(--bg-modal); border: 1px solid var(--border);
  transition: border-color 0.12s, box-shadow 0.12s, transform 0.08s;
}
.fcm-deck:hover { border-color: var(--deck-color, var(--accent-soft)); box-shadow: 0 3px 12px rgba(20, 22, 43, 0.07); }
.fcm-deck:active { transform: translateY(1px); }
.fcm-deck-ic {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; flex-shrink: 0; border-radius: 10px; font-size: 20px; line-height: 1;
  background: color-mix(in srgb, var(--deck-color, var(--accent)) 16%, transparent);
}
.fcm-deck-ic.sm { width: 26px; height: 26px; font-size: 16px; border-radius: 7px; background: none; }
.fcm-deck-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.fcm-deck-name { font-size: 14px; font-weight: 650; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fcm-deck-meta { font-size: 12px; color: var(--text-light); }
.fcm-deck-meta b { color: var(--accent); font-weight: 700; }
.fcm-deck-play, .fcm-deck-menu {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; flex-shrink: 0; border-radius: 7px;
  color: var(--text-faint); background: none; border: none; cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.fcm-deck-play:hover { background: var(--accent); color: #fff; }
.fcm-deck-menu:hover { background: var(--bg-hover); color: var(--text); }

/* deck popover menu */
.fcm-pop {
  position: absolute; z-index: 5; min-width: 150px; padding: 5px;
  background: var(--bg-modal); border: 1px solid var(--border);
  border-radius: 9px; box-shadow: var(--shadow-popover); animation: fc-in 0.1s ease;
}
.fcm-pop-item {
  display: block; width: 100%; text-align: left; padding: 7px 10px; border-radius: 6px;
  font-size: 13px; color: var(--text); background: none; border: none; cursor: pointer; font-family: var(--font);
}
.fcm-pop-item:hover { background: var(--bg-hover); }
.fcm-pop-item.danger { color: var(--danger); }
.fcm-pop-item.danger:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); }

/* deck create/customize form */
.fcm-deckform {
  margin-top: 14px; padding: 14px; border-radius: 11px;
  border: 1px dashed var(--border-strong); display: flex; flex-direction: column; gap: 12px;
}
.fcm-deckform[hidden] { display: none; }
.fcm-df-row { display: flex; gap: 8px; }
.fcm-df-emoji {
  width: 46px; text-align: center; font-size: 18px; padding: 8px 6px;
  border: 1px solid var(--border-strong); border-radius: 8px; background: var(--bg-input); color: var(--text); outline: none;
}
.fcm-df-name {
  flex: 1; padding: 9px 12px; font-size: 14px; font-family: var(--font);
  border: 1px solid var(--border-strong); border-radius: 8px; background: var(--bg-input); color: var(--text); outline: none;
}
.fcm-df-name:focus, .fcm-df-emoji:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(91, 91, 214, 0.16); }
.fcm-df-colors { display: flex; gap: 7px; flex-wrap: wrap; }
.fcm-swatch { width: 24px; height: 24px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08); }
.fcm-swatch.on { border-color: var(--text); }
.fcm-df-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* deck detail toolbar + card list */
.fcm-deck-bar { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.fcm-deck-count { margin-left: auto; font-size: 12.5px; color: var(--text-faint); }
.fcm-cardlist { display: flex; flex-direction: column; gap: 8px; }
.fcm-card {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 12px; border-radius: 10px; cursor: pointer;
  background: var(--bg-modal); border: 1px solid var(--border);
  transition: border-color 0.12s, background 0.12s;
}
.fcm-card:hover { border-color: var(--border-strong); background: var(--bg-hover); }
.fcm-card-main { flex: 1; min-width: 0; }
.fcm-card-front { font-size: 13.5px; font-weight: 600; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fcm-card-back { font-size: 12.5px; color: var(--text-light); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 2px; }
.fcm-card-meta { flex-shrink: 0; }
.fcm-card-due {
  font-size: 11px; font-weight: 600; color: var(--text-faint);
  padding: 2px 9px; border-radius: 12px; background: var(--bg-hover); white-space: nowrap;
}
.fcm-card-due.due { color: #fff; background: var(--accent); }
.fcm-card-acts { display: flex; gap: 2px; flex-shrink: 0; }

/* empty state */
.fcm-empty { text-align: center; padding: 46px 20px; color: var(--text-faint); }
.fcm-empty .ic { color: var(--text-faint); opacity: 0.6; }
.fcm-empty-t { margin-top: 10px; font-size: 15px; font-weight: 650; color: var(--text-light); }
.fcm-empty-s { margin-top: 3px; font-size: 13px; }

/* card editor */
.fcm-editform { display: flex; flex-direction: column; gap: 14px; }
.fcm-field { display: flex; flex-direction: column; gap: 6px; }
.fcm-field-l { font-size: 12px; font-weight: 600; color: var(--text-light); }
.fcm-input {
  width: 100%; padding: 10px 12px; font-family: var(--font); font-size: 14px; line-height: 1.5;
  border: 1px solid var(--border-strong); border-radius: 9px; background: var(--bg-input); color: var(--text);
  outline: none; resize: vertical;
}
.fcm-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(91, 91, 214, 0.16); }
select.fcm-input { resize: none; cursor: pointer; }
.fcm-editform-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 4px; }

@media (max-width: 560px) {
  .fcm-decks { grid-template-columns: 1fr; }
  .fcm-overlay { padding: 24px 10px; }
}

/* ============================================================
   Review PAGE (mountReview) — full-page section, scoped .rv-*
   ============================================================ */
.rv-root {
  max-width: 1040px; margin: 0 auto; padding: 40px 56px 80px;
  color: var(--text); font-family: var(--font);
}

/* shared buttons */
.rv-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 8px 15px; border-radius: 9px; cursor: pointer;
  font-family: var(--font); font-size: 13.5px; font-weight: 600;
  color: var(--text-light); background: var(--bg); border: 1px solid var(--border-strong);
  transition: background 0.12s, color 0.12s, border-color 0.12s, filter 0.12s, opacity 0.12s;
  white-space: nowrap;
}
.rv-btn:hover { background: var(--bg-hover); color: var(--text); }
.rv-btn:disabled { opacity: 0.45; cursor: default; }
.rv-btn.primary { color: #fff; background: var(--accent); border-color: var(--accent); }
.rv-btn.primary:hover { filter: brightness(1.06); background: var(--accent); }
.rv-btn.lg { padding: 11px 20px; font-size: 14px; border-radius: 10px; }
.rv-btn.wide { width: 100%; }
.rv-btn.icon { padding: 8px; width: 36px; }
.rv-btn.icon.sm { width: 30px; height: 30px; padding: 0; }
.rv-btn.icon.danger:hover { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.rv-btn.rec { color: #fff; background: #e5484d; border-color: #e5484d; }
.rv-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; background: currentColor; opacity: 0.7; }
.rv-dot.live { background: #fff; animation: rv-rec-blink 1.1s ease-in-out infinite; }
@keyframes rv-rec-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }
@media (prefers-reduced-motion: reduce) { .rv-dot.live { animation: none; } }
.rv-audio-tip { flex-basis: 100%; font-size: 11.5px; color: var(--text-faint); margin-top: 2px; }
.rv-danger-btn {
  margin-right: auto; padding: 8px 14px; border-radius: 9px; cursor: pointer; font-size: 13px; font-weight: 600;
  color: var(--danger); background: none; border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--border));
}
.rv-danger-btn:hover { background: var(--danger); color: #fff; }

/* page header */
.rv-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.rv-h1 { display: flex; align-items: center; gap: 11px; font-size: 32px; font-weight: 700; letter-spacing: -0.5px; margin: 0; }
.rv-h1 .ic { color: var(--accent); }
.rv-sub { margin: 6px 0 0; font-size: 14px; color: var(--text-light); }

/* stats strip */
.rv-stats { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-bottom: 22px; }
.rv-stat {
  padding: 13px 14px; border-radius: 12px; background: var(--bg-modal); border: 1px solid var(--border);
}
.rv-stat.streak { background: linear-gradient(160deg, color-mix(in srgb, #f59e0b 12%, var(--bg-modal)), var(--bg-modal)); border-color: color-mix(in srgb, #f59e0b 30%, var(--border)); }
.rv-stat.hot { background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 12%, var(--bg-modal)), var(--bg-modal)); border-color: color-mix(in srgb, var(--accent) 30%, var(--border)); }
.rv-stat-top { display: flex; align-items: center; gap: 7px; }
.rv-stat-emoji { font-size: 16px; }
.rv-stat-n { font-size: 22px; font-weight: 800; color: var(--text); font-variant-numeric: tabular-nums; }
.rv-stat-l { margin-top: 2px; font-size: 11.5px; color: var(--text-light); }

/* upcoming chart */
.rv-chart { padding: 14px 16px 10px; border-radius: 12px; background: var(--bg-modal); border: 1px solid var(--border); margin-bottom: 26px; }
.rv-chart-title { font-size: 12px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-faint); margin-bottom: 12px; }
.rv-bars { display: flex; align-items: flex-end; gap: 6px; height: 86px; }
.rv-bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; gap: 4px; height: 100%; }
.rv-bar-cap { font-size: 10px; color: var(--text-faint); min-height: 12px; font-variant-numeric: tabular-nums; }
.rv-bar { width: 100%; max-width: 30px; border-radius: 5px 5px 2px 2px; background: color-mix(in srgb, var(--accent) 35%, var(--border)); transition: height 0.2s; }
.rv-bar.today { background: var(--accent); }

/* section head */
.rv-sec-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.rv-sec-title { font-size: 17px; font-weight: 650; color: var(--text); }
.rv-newdeck {
  display: inline-flex; align-items: center; gap: 5px; padding: 6px 12px; border-radius: 8px; cursor: pointer;
  font-size: 12.5px; font-weight: 600; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
}
.rv-newdeck:hover { background: color-mix(in srgb, var(--accent) 18%, transparent); }

/* deck grid */
.rv-decks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.rv-deck {
  position: relative; display: flex; align-items: center; gap: 12px; text-align: left; cursor: pointer;
  padding: 15px; border-radius: 13px; background: var(--bg-modal); border: 1px solid var(--border);
  transition: border-color 0.12s, box-shadow 0.12s, transform 0.08s;
}
.rv-deck:hover { border-color: var(--deck-color, var(--accent-soft)); box-shadow: 0 4px 16px rgba(20, 22, 43, 0.08); transform: translateY(-1px); }
.rv-deck-ic {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; flex-shrink: 0; border-radius: 11px; font-size: 22px; line-height: 1;
  background: color-mix(in srgb, var(--deck-color, var(--accent)) 16%, transparent);
}
.rv-deck-ic.sm { width: 28px; height: 28px; font-size: 18px; background: none; border-radius: 0; }
.rv-deck-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; flex: 1; }
.rv-deck-name { font-size: 14.5px; font-weight: 650; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rv-deck-meta { font-size: 12px; color: var(--text-light); }
.rv-deck-meta b { color: var(--accent); font-weight: 700; }
.rv-deck-play, .rv-deck-menu {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; flex-shrink: 0; border-radius: 8px; color: var(--text-faint); background: none; border: none; cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.rv-deck-play:hover { background: var(--accent); color: #fff; }
.rv-deck-menu:hover { background: var(--bg-hover); color: var(--text); }

/* popovers (deck menu + session options) */
.rv-pop {
  position: fixed; z-index: 300; min-width: 150px; padding: 6px;
  background: var(--bg-modal); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow-popover);
}
.rv-pop-item { display: block; width: 100%; text-align: left; padding: 8px 10px; border-radius: 7px; font-size: 13px; color: var(--text); background: none; border: none; cursor: pointer; font-family: var(--font); }
.rv-pop-item:hover { background: var(--bg-hover); }
.rv-pop-item.danger { color: var(--danger); }
.rv-pop-item.danger:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); }
.rv-opts { min-width: 260px; padding: 12px; display: flex; flex-direction: column; gap: 12px; }
.rv-opt-l { font-size: 12px; font-weight: 600; color: var(--text-light); margin-bottom: 6px; }
.rv-seg { display: flex; gap: 3px; padding: 3px; background: var(--bg-callout); border: 1px solid var(--border); border-radius: 9px; }
.rv-seg-b { flex: 1; padding: 6px 8px; border-radius: 6px; font-size: 12px; font-weight: 600; color: var(--text-light); background: none; border: none; cursor: pointer; font-family: var(--font); white-space: nowrap; }
.rv-seg-b.on { color: var(--text); background: var(--bg-modal); box-shadow: 0 1px 3px rgba(20,22,43,0.1), 0 0 0 1px var(--border); }

/* deck form */
.rv-deckform { margin-top: 16px; padding: 16px; border-radius: 13px; border: 1px dashed var(--border-strong); display: flex; flex-direction: column; gap: 13px; }
.rv-deckform[hidden] { display: none; }
.rv-df-row { display: flex; gap: 8px; }
.rv-df-emoji { width: 48px; text-align: center; font-size: 18px; padding: 9px 6px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--bg-input); color: var(--text); outline: none; }
.rv-df-name { flex: 1; padding: 10px 12px; font-size: 14px; font-family: var(--font); border: 1px solid var(--border-strong); border-radius: 8px; background: var(--bg-input); color: var(--text); outline: none; }
.rv-df-name:focus, .rv-df-emoji:focus, .rv-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(91, 91, 214, 0.16); }
.rv-df-colors { display: flex; gap: 8px; flex-wrap: wrap; }
.rv-swatch { width: 26px; height: 26px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08); }
.rv-swatch.on { border-color: var(--text); }
.rv-df-langrow { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--text-light); }
.rv-df-hint { color: var(--text-faint); font-weight: 400; }
.rv-df-lang { padding: 8px 10px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--bg-input); color: var(--text); font-family: var(--font); font-size: 13px; cursor: pointer; }
.rv-df-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* deck browse */
.rv-back-head { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.rv-back-title { display: flex; align-items: center; gap: 9px; font-size: 22px; font-weight: 700; letter-spacing: -0.3px; }
.rv-deck-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.rv-search { display: flex; align-items: center; gap: 8px; padding: 9px 12px; border: 1px solid var(--border-strong); border-radius: 10px; background: var(--bg-input); color: var(--text-faint); margin-bottom: 14px; }
.rv-search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(91,91,214,0.14); }
.rv-search-in { flex: 1; border: none; outline: none; background: none; font-family: var(--font); font-size: 14px; color: var(--text); }
.rv-cardlist { display: flex; flex-direction: column; gap: 8px; }
.rv-card { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 11px; cursor: pointer; background: var(--bg-modal); border: 1px solid var(--border); transition: border-color 0.12s, background 0.12s; }
.rv-card:hover { border-color: var(--border-strong); background: var(--bg-hover); }
.rv-card-main { flex: 1; min-width: 0; }
.rv-card-front { font-size: 14px; font-weight: 600; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rv-card-back { font-size: 12.5px; color: var(--text-light); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 2px; }
.rv-card-hint { font-size: 11.5px; color: var(--text-faint); margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rv-card-meta { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.rv-card-audio { display: inline-flex; color: var(--accent); }
.rv-card-due { font-size: 11px; font-weight: 600; color: var(--text-faint); padding: 2px 9px; border-radius: 12px; background: var(--bg-hover); white-space: nowrap; }
.rv-card-due.due { color: #fff; background: var(--accent); }
.rv-card-acts { display: flex; gap: 3px; flex-shrink: 0; }

/* empty state */
.rv-empty { text-align: center; padding: 54px 20px; color: var(--text-faint); }
.rv-empty .ic { opacity: 0.55; }
.rv-empty-t { margin-top: 12px; font-size: 16px; font-weight: 650; color: var(--text-light); }
.rv-empty-s { margin-top: 4px; font-size: 13.5px; }

/* card editor */
.rv-editform { display: flex; flex-direction: column; gap: 16px; max-width: 620px; }
.rv-field { display: flex; flex-direction: column; gap: 7px; }
.rv-field-l { font-size: 12.5px; font-weight: 600; color: var(--text-light); display: flex; align-items: center; gap: 5px; }
.rv-field-opt { color: var(--text-faint); font-weight: 400; }
.rv-input { width: 100%; padding: 11px 13px; font-family: var(--font); font-size: 14.5px; line-height: 1.5; border: 1px solid var(--border-strong); border-radius: 10px; background: var(--bg-input); color: var(--text); outline: none; resize: vertical; }
select.rv-input { resize: none; cursor: pointer; }
.rv-audio-box { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 12px; border-radius: 10px; background: var(--bg-callout); border: 1px solid var(--border); }
.rv-audio-note { font-size: 12.5px; color: var(--text-faint); }
.rv-editform-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 4px; }

/* study session */
.rv-sess-bar { display: flex; align-items: center; gap: 12px; margin-bottom: 30px; }
.rv-sess-prog { flex: 1; height: 8px; border-radius: 999px; background: var(--bg-hover); overflow: hidden; }
.rv-sess-fill { height: 100%; background: var(--accent); border-radius: 999px; transition: width 0.25s ease; }
.rv-sess-count { font-size: 13px; font-weight: 600; color: var(--text-light); font-variant-numeric: tabular-nums; white-space: nowrap; }
.rv-sess-stage {
  position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 16px;
  min-height: 260px; padding: 40px 32px; margin: 0 auto 24px; max-width: 720px;
  border-radius: 18px; background: var(--bg-modal); border: 1px solid var(--border); box-shadow: 0 4px 24px rgba(20, 22, 43, 0.06);
}
.rv-sess-mode { position: absolute; top: 14px; left: 16px; font-size: 10.5px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-faint); background: var(--bg-hover); padding: 3px 9px; border-radius: 999px; }
.rv-face { font-size: 24px; line-height: 1.45; color: var(--text); white-space: pre-wrap; word-break: break-word; max-width: 100%; }
.rv-face-prompt { font-weight: 650; }
.rv-face-answer { font-size: 20px; color: var(--text); border-top: 1px solid var(--border); padding-top: 20px; width: 100%; }
.rv-face-hint { font-size: 14px; color: var(--text-faint); }
.rv-sess-audio { display: flex; gap: 8px; }
.rv-sess-controls { display: flex; justify-content: center; max-width: 720px; margin: 0 auto; }
.rv-grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; max-width: 720px; margin: 0 auto; }
.rv-grade {
  display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 12px 8px; border-radius: 11px; cursor: pointer;
  font-family: var(--font); border: 1px solid var(--border-strong); background: var(--bg-modal); transition: transform 0.08s, filter 0.12s, border-color 0.12s;
}
.rv-grade:hover { transform: translateY(-1px); }
.rv-grade:active { transform: translateY(0); }
.rv-grade-label { font-size: 14px; font-weight: 700; }
.rv-grade-ivl { font-size: 11.5px; color: var(--text-faint); font-variant-numeric: tabular-nums; }
.rv-grade.again { border-color: color-mix(in srgb, #e5484d 45%, var(--border)); color: #e5484d; }
.rv-grade.again:hover { background: color-mix(in srgb, #e5484d 10%, var(--bg-modal)); }
.rv-grade.hard { border-color: color-mix(in srgb, #f59e0b 45%, var(--border)); color: #d98324; }
.rv-grade.hard:hover { background: color-mix(in srgb, #f59e0b 10%, var(--bg-modal)); }
.rv-grade.good { border-color: color-mix(in srgb, #10b981 45%, var(--border)); color: #0e9f6e; }
.rv-grade.good:hover { background: color-mix(in srgb, #10b981 10%, var(--bg-modal)); }
.rv-grade.easy { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); color: var(--accent); }
.rv-grade.easy:hover { background: color-mix(in srgb, var(--accent) 10%, var(--bg-modal)); }

/* session done */
.rv-done { text-align: center; padding: 60px 20px; max-width: 480px; margin: 0 auto; }
.rv-done-glyph { display: inline-flex; align-items: center; justify-content: center; width: 76px; height: 76px; border-radius: 50%; color: #fff; background: var(--accent); margin-bottom: 18px; box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 40%, transparent); }
.rv-done-title { font-size: 20px; font-weight: 700; color: var(--text); }
.rv-done-sub { margin-top: 6px; font-size: 14px; color: var(--text-light); }
.rv-done-actions { display: flex; justify-content: center; gap: 10px; margin-top: 24px; }

@media (max-width: 900px) {
  .rv-root { padding: 32px 24px 60px; }
  .rv-stats { grid-template-columns: repeat(3, 1fr); }
  .rv-decks { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .rv-root { padding: 22px 14px 50px; }
  .rv-header { flex-direction: column; align-items: stretch; gap: 14px; }
  .rv-h1 { font-size: 26px; }
  .rv-stats { grid-template-columns: repeat(2, 1fr); }
  .rv-decks { grid-template-columns: 1fr; }
  .rv-grades { grid-template-columns: repeat(2, 1fr); }
  .rv-face { font-size: 20px; }
}