/* TOEIC Buổi Tối — nhóm màn hình "learn": từ vựng, ngữ pháp & chiến lược, kho tài liệu. [v-learn]
   Mọi class mang tiền tố learn-. Chỉ dùng token và component của css/app.css; không có màu cứng, không có khối theme riêng.
   Mục lục: 1 tuần xếp gọn & hàng bài · 2 tóm tắt từ vựng · 3 tìm từ & danh sách từ · 4 flashcard · 5 phiên ôn thẻ
            · 6 bài giảng · 7 kho tài liệu · 8 phân trang trước/sau · 9 chuyển động */

/* ───────────────────────── 1. Giai đoạn, tuần xếp gọn, hàng chủ đề / bài ───────────────────────── */
.learn-phase { display: grid; gap: var(--s2); min-width: 0; grid-template-columns: minmax(0, 1fr); }
.learn-phase + .learn-phase { margin-top: var(--s3); }
.learn-phase-head { display: flex; align-items: center; flex-wrap: wrap; gap: var(--s1) var(--s3); padding: var(--s1) 0; }
.learn-phase-title { font-family: var(--font-display); font-size: var(--fs-md); font-weight: 700; line-height: var(--lh-tight); }
.learn-phase-weeks { font-size: var(--fs-sm); color: var(--muted); }

.learn-week { min-width: 0; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); }
.learn-week-head {
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: var(--s3);
  width: 100%; min-height: 60px; padding: var(--s2) var(--s3) var(--s2) var(--s4); border: 0; border-radius: var(--r-lg);
  background: none; color: var(--ink); text-align: left; font: inherit;
}
.learn-week-head:hover { background: var(--surface-2); }
.learn-week-head:focus-visible { outline-offset: -3px; border-radius: var(--r-lg); }
.learn-week-n {
  display: grid; place-items: center; min-width: 64px; min-height: 28px; padding: 0 var(--s2); border-radius: var(--r-sm);
  background: var(--sunken); font-family: var(--font-display); font-weight: 700; font-size: var(--fs-sm); white-space: nowrap; font-variant-numeric: tabular-nums;
}
.learn-week.is-current .learn-week-n { background: var(--brand); color: var(--on-brand); }
.learn-week-main { display: grid; gap: 1px; min-width: 0; }
.learn-week-title { font-weight: 600; line-height: 1.35; }
.learn-week-sub { font-size: var(--fs-sm); color: var(--muted); font-variant-numeric: tabular-nums; }
.learn-week-chev { color: var(--muted); transition: transform 0.15s ease; }
.learn-week.is-open .learn-week-chev { transform: rotate(180deg); }
.learn-week.is-open > .learn-week-head { border-radius: var(--r-lg) var(--r-lg) 0 0; }
.learn-week-body { padding: var(--s2); border-top: 1px solid var(--line); }

.learn-rows { display: grid; gap: 2px; grid-template-columns: minmax(0, 1fr); min-width: 0; }
@media (min-width: 720px) { .learn-rows { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px var(--s3); } }
.learn-row {
  display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; align-items: center; gap: var(--s3);
  min-height: 60px; padding: var(--s2); border-radius: var(--r-md); color: var(--ink); text-decoration: none; min-width: 0;
}
a.learn-row:hover { background: var(--surface-2); }
a.learn-row:focus-visible { outline-offset: -2px; border-radius: var(--r-md); }
.learn-row-n {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: var(--r-md); background: var(--sunken); color: var(--ink);
  font-family: var(--font-display); font-weight: 700; font-size: 0.95rem; font-variant-numeric: tabular-nums;
}
.learn-row.is-current .learn-row-n { background: var(--brand); color: var(--on-brand); }
.learn-row.is-full .learn-row-n { background: var(--ok-soft); color: var(--ok-ink); }
.learn-row-main { display: grid; gap: 4px; min-width: 0; }
.learn-row-title { font-weight: 600; line-height: 1.35; }
.learn-row-sub { display: flex; flex-wrap: wrap; align-items: center; gap: 4px var(--s2); font-size: var(--fs-sm); color: var(--muted); font-variant-numeric: tabular-nums; }
.learn-row-sub .chip { min-height: 22px; padding-block: 1px; }
.learn-row-bar { max-width: 180px; }
.learn-row-end { display: inline-flex; color: var(--muted); }
/* ngày chưa mở: hiện mờ, có khóa */
.learn-row.is-locked { color: var(--muted); }
.learn-row.is-locked .learn-row-n { background: none; border: 1.5px dashed var(--line-strong); color: var(--muted); }
.learn-row.is-locked .learn-row-title { font-weight: 500; }

.learn-list-tools { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--s2) var(--s3); }

/* ───────────────────────── 2. Tóm tắt từ vựng ───────────────────────── */
.learn-sum { gap: var(--s4); }
.learn-sum-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s4) var(--s3); }
@media (min-width: 640px) { .learn-sum-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.learn-sum-stats .stat-value { font-size: var(--fs-2xl); }
.learn-sum-stats .is-due .stat-value { color: var(--brand); }
.learn-sum-bar { display: grid; gap: 6px; }
.learn-sum-cta { display: grid; gap: var(--s3); padding-top: var(--s4); border-top: 1px solid var(--line); grid-template-columns: minmax(0, 1fr); }
.learn-sum-note { color: var(--muted); max-width: 60ch; }
.learn-sum-note strong { color: var(--ink); }
.learn-sum-btns { display: flex; flex-wrap: wrap; gap: var(--s2) var(--s3); }
.learn-sum-btns .btn-lg { flex: 1 1 260px; white-space: normal; }
@media (min-width: 640px) {
  .learn-sum-cta.is-due { grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: var(--s4) var(--s5); }
  .learn-sum-btns .btn-lg { flex: 0 1 auto; }
}

/* ô đếm hộp thẻ (1–6): tô tới hộp hiện tại; từ hộp 4 là "đã thuộc" */
.learn-boxes { display: inline-flex; align-items: center; gap: 3px; flex: none; }
.learn-boxes i { width: 9px; height: 9px; border-radius: 2px; border: 1.5px solid var(--line-strong); background: none; }
.learn-boxes i.is-on { background: var(--pencil); border-color: var(--pencil); }
.learn-boxes i.is-ok { background: var(--ok); border-color: var(--ok); }
.learn-boxes i:nth-child(4) { margin-left: 4px; }

/* ───────────────────────── 3. Tìm từ & danh sách từ ───────────────────────── */
.learn-search { display: grid; gap: var(--s3); min-width: 0; }
.learn-search-out { display: grid; gap: var(--s3); min-width: 0; }
.learn-search-out:empty { display: none; }
.learn-search-load { display: grid; gap: var(--s2); padding: var(--s3) var(--s4); border-radius: var(--r-md); background: var(--sunken); font-size: var(--fs-sm); color: var(--muted); font-variant-numeric: tabular-nums; }
.learn-search-load .bar { background: var(--line); }
.learn-search-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--s2) var(--s3); }
.learn-search-count { font-weight: 600; }

.learn-words { display: grid; min-width: 0; border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); overflow: hidden; }
.learn-word {
  display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: var(--s1);
  padding: var(--s1) var(--s2) var(--s1) var(--s1); border-top: 1px solid var(--line); min-width: 0;
}
.learn-word:first-child { border-top: 0; }
.learn-word.no-audio { grid-template-columns: minmax(0, 1fr); padding-left: var(--s2); }
.learn-word-main {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 2px var(--s3);
  min-width: 0; min-height: 56px; padding: var(--s2); border: 0; border-radius: var(--r-md);
  background: none; color: var(--ink); text-align: left; text-decoration: none; font: inherit;
}
button.learn-word-main:hover, a.learn-word-main:hover { background: var(--surface-2); }
.learn-word-main:focus-visible { outline-offset: -2px; border-radius: var(--r-md); }
.learn-word-text { display: grid; gap: 1px; min-width: 0; }
.learn-word-top { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 var(--s2); }
.learn-word-w { font-size: 1.22rem; font-weight: 600; line-height: 1.3; overflow-wrap: anywhere; }
.learn-word-pos { font-size: var(--fs-xs); color: var(--muted); white-space: nowrap; }
.learn-word-vi { line-height: 1.45; }
.learn-word-sub { font-size: var(--fs-sm); color: var(--muted); }
.learn-word-end { display: inline-flex; align-items: center; }
.learn-words-sep { padding: 6px var(--s4); border-top: 1px solid var(--line); background: var(--sunken); color: var(--muted); font-size: var(--fs-xs); font-weight: 600; }
@media (max-width: 419px) {
  .learn-word-main { grid-template-columns: minmax(0, 1fr); }
  .learn-word-end { justify-self: start; }
}

/* ba chế độ xem từ: chia đều bề ngang để cả ba tab luôn nằm trọn trong 360px */
.learn-modes { min-width: 0; }
.learn-modes .tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; overflow: visible; }
.learn-modes .tab { justify-content: center; min-width: 0; padding-inline: var(--s1); }
@media (max-width: 379px) { .learn-modes .tab { gap: var(--s1); font-size: 0.9rem; } }
@media (min-width: 640px) {
  .learn-modes .tabs { display: flex; gap: var(--s1); }
  .learn-modes .tab { padding-inline: var(--s4); }
}

.learn-panel { display: grid; gap: var(--s4); min-width: 0; grid-template-columns: minmax(0, 1fr); }
.learn-panel:focus-visible { outline: none; }
.learn-intro { display: grid; gap: var(--s3); justify-items: start; max-width: 60ch; }
.learn-intro-title { font-size: var(--fs-lg); }
.learn-intro-facts { display: flex; flex-wrap: wrap; gap: var(--s2); }
.learn-intro-note { padding-left: var(--s3); border-left: 3px solid var(--mark); color: var(--muted); }
.learn-intro-note strong { color: var(--ink); }
.learn-intro-btns { display: flex; flex-wrap: wrap; gap: var(--s2) var(--s3); width: 100%; }
.learn-intro-btns .btn-lg { flex: 1 1 220px; white-space: normal; }
@media (min-width: 640px) { .learn-intro-btns .btn-lg { flex: 0 1 auto; } }

/* ───────────────────────── 4. Flashcard ───────────────────────── */
.learn-fc-wrap { display: grid; gap: var(--s4); width: 100%; max-width: 560px; margin-inline: auto; min-width: 0; grid-template-columns: minmax(0, 1fr); }
.learn-fc-top { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: var(--s3); }
.learn-fc-count { font-family: var(--font-display); font-weight: 700; font-variant-numeric: tabular-nums; white-space: nowrap; }
.learn-fc {
  position: relative; display: grid; grid-template-rows: auto minmax(0, 1fr); min-height: 340px; min-width: 0;
  border: 1px solid var(--line); border-radius: var(--r-xl); background: var(--surface); box-shadow: var(--shadow-1);
  cursor: pointer; touch-action: pan-y; -webkit-tap-highlight-color: transparent;
}
.learn-fc:focus-visible { outline: none; }
/* đầu thẻ kẻ một vạch bút bi như thẻ ghi chú */
.learn-fc-head {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s3);
  margin-inline: var(--s5); padding: var(--s3) 0 var(--s2); border-bottom: 2px solid var(--brand);
  font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted);
}
.learn-fc-face { display: grid; align-content: center; justify-items: center; gap: var(--s3); padding: var(--s5); text-align: center; min-width: 0; }
.learn-fc-word { font-size: clamp(2rem, 9vw, 2.75rem); font-weight: 600; line-height: 1.15; overflow-wrap: anywhere; max-width: 100%; }
.learn-fc-pos { font-size: var(--fs-sm); color: var(--muted); }
.learn-fc-tap { font-size: var(--fs-sm); color: var(--muted); }
.learn-fc-face.is-back { justify-items: stretch; align-content: start; text-align: left; gap: var(--s3); }
.learn-fc-line { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s1) var(--s2); }
.learn-fc-w2 { font-size: 1.5rem; font-weight: 600; line-height: 1.2; overflow-wrap: anywhere; }
.learn-fc-vi { font-size: var(--fs-xl); font-weight: 600; line-height: 1.3; }
.learn-fc-vi small { font-size: var(--fs-sm); font-weight: 400; color: var(--muted); margin-left: var(--s2); white-space: nowrap; }
.learn-fc-ex { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: start; gap: 2px var(--s1); padding: var(--s2) var(--s3) var(--s3) var(--s1); border-radius: var(--r-md); background: var(--sunken); }
.learn-fc-ex.no-audio { grid-template-columns: minmax(0, 1fr); padding-left: var(--s3); }
.learn-fc-ex-body { display: grid; gap: 2px; min-width: 0; padding-top: 7px; }
.learn-fc-ex.no-audio .learn-fc-ex-body { padding-top: var(--s1); }
.learn-fc-ex-en { font-size: 1.1rem; }
.learn-fc-ex-vi { color: var(--muted); font-size: 0.95rem; }
.learn-fc-note { font-size: var(--fs-sm); line-height: 1.55; padding-left: 10px; border-left: 3px solid var(--mark); }
.learn-fc-ctl { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: var(--s3); }
.learn-fc-ctl .btn-lg { width: 100%; }
.learn-fc-ctl .btn-icon { width: 52px; min-width: 52px; min-height: 52px; }
.learn-keys { text-align: center; font-size: var(--fs-sm); color: var(--muted); }
.learn-key {
  display: inline-grid; place-items: center; min-width: 22px; height: 22px; padding: 0 5px; margin: 0 1px; border: 1px solid var(--line-strong); border-bottom-width: 2px;
  border-radius: 5px; background: var(--surface); color: var(--ink); font-family: var(--font-ui); font-size: 0.72rem; font-weight: 600; line-height: 1;
}
@media (hover: none) and (pointer: coarse) { .learn-keys, .learn-grade .learn-key { display: none; } }

/* ───────────────────────── 5. Phiên ôn thẻ ───────────────────────── */
.learn-rv { display: grid; gap: var(--s4); width: 100%; max-width: 560px; margin-inline: auto; min-width: 0; grid-template-columns: minmax(0, 1fr); }
.learn-rv-top { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: var(--s3); }
.learn-rv-left { font-size: var(--fs-sm); color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.learn-rv-card { cursor: default; min-height: 300px; scroll-margin-block: calc(var(--topbar-h) + var(--s3)) var(--s6); }
.learn-rv-card.is-again .learn-fc-head { border-bottom-color: var(--warn); }
/* điện thoại: khi mở đáp án, thẻ được cuộn vào tầm nhìn — chừa chỗ cho hàng nút chấm dính đáy + thanh tab */
@media (max-width: 899px) { .learn-rv-card { scroll-margin-bottom: calc(var(--tabbar-h) + 150px + env(safe-area-inset-bottom, 0px)); } }
.learn-rv-actions { display: grid; gap: var(--s2); min-width: 0; }
.learn-rv-ask { font-size: var(--fs-sm); font-weight: 600; text-align: center; }
.learn-grades { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s2); }
.learn-grade {
  display: grid; gap: 2px; justify-items: center; align-content: center; min-width: 0; min-height: 68px; padding: var(--s2) 2px;
  border: 1.5px solid var(--line-strong); border-radius: var(--r-lg); background: var(--surface); color: var(--ink);
  font: inherit; font-weight: 600; font-size: 0.9rem; line-height: 1.2; text-align: center;
  transition: background-color 0.12s, transform 0.06s;
}
.learn-grade:active { transform: translateY(1px); }
.learn-grade-when { font-size: var(--fs-xs); font-weight: 500; color: var(--muted); font-variant-numeric: tabular-nums; }
.learn-grade-again { border-color: var(--bad); background: var(--bad-soft); }
.learn-grade-hard { border-color: var(--warn); background: var(--warn-soft); }
.learn-grade-good { border-color: var(--ok); background: var(--ok-soft); }
.learn-grade-easy { border-color: var(--brand); background: var(--brand-soft); }
.learn-grade:hover { box-shadow: inset 0 0 0 1.5px currentColor; }
.learn-grade .learn-key { margin-top: 2px; }

/* điện thoại: hàng nút của thẻ luôn nằm trong tầm ngón tay, ngay trên thanh tab */
@media (max-width: 899px) {
  .learn-rv-actions, .learn-fc-ctl {
    position: sticky; bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px)); z-index: 5;
    margin-inline: calc(-1 * var(--gutter)); padding: var(--s2) var(--gutter) var(--s3);
    background: var(--bg); border-top: 1px solid var(--line);
  }
}

.learn-done { gap: var(--s4); }
.learn-done-head { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: var(--s4); }
.learn-done-title { font-size: var(--fs-xl); }
.learn-done-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s3); padding-top: var(--s4); border-top: 1px solid var(--line); }
@media (min-width: 480px) { .learn-done-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.learn-done-stats .stat-value { font-size: var(--fs-xl); }
.learn-done-actions { display: flex; flex-wrap: wrap; gap: var(--s2) var(--s3); }
.learn-done-actions .btn-primary { flex: 1 1 220px; }

/* ───────────────────────── 6. Bài giảng ───────────────────────── */
.learn-meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2); }
.learn-goal {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--s3); max-width: 68ch;
  padding: var(--s3) var(--s4); border-left: 3px solid var(--mark); border-radius: 0 var(--r-md) var(--r-md) 0; background: var(--surface);
}
.learn-goal > .icon { margin-top: 3px; color: var(--muted); }
.learn-goal-label { font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.learn-article { display: grid; gap: var(--s5); min-width: 0; grid-template-columns: minmax(0, 1fr); }
.learn-article .section { max-width: 68ch; }
/* bảng trong bài: tiêu đề cột được xuống dòng để bảng ít cột nằm trọn màn hình điện thoại; bề rộng tối thiểu của từng cột
   do fitTables() đặt theo nội dung, bảng nào vẫn rộng hơn khung thì cuộn ngang trong .table-wrap */
.learn-article .table thead th { white-space: normal; }
@media (max-width: 479px) { .learn-article .table th, .learn-article .table td { padding-inline: var(--s3); } }
.learn-article .table-wrap:focus-visible { border-radius: var(--r-md); }
.learn-scroll-hint { display: flex; align-items: center; gap: 4px; margin-top: calc(-1 * var(--s2)); font-size: var(--fs-xs); color: var(--muted); }
.learn-cta { gap: var(--s3); max-width: 68ch; }
.learn-cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s3); }
.learn-cta-row .btn-lg { flex: 1 1 240px; white-space: normal; }
@media (min-width: 640px) { .learn-cta-row .btn-lg { flex: 0 1 auto; } }
.learn-today { gap: var(--s3); }
.learn-today-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s3) var(--s4); }
.learn-today-main { display: grid; gap: var(--s1); min-width: 0; flex: 1 1 280px; }
.learn-today-row .btn-lg { flex: 1 1 240px; white-space: normal; }
@media (min-width: 640px) { .learn-today-row .btn-lg { flex: 0 1 auto; } }
.learn-today-title { font-family: var(--font-display); font-size: var(--fs-lg); font-weight: 700; line-height: 1.25; }
.learn-progress { display: grid; gap: 6px; }
.learn-progress-text { font-size: var(--fs-sm); color: var(--muted); font-variant-numeric: tabular-nums; }

/* ───────────────────────── 7. Kho tài liệu ───────────────────────── */
.learn-tiles { display: grid; gap: var(--s3); grid-template-columns: repeat(2, minmax(0, 1fr)); min-width: 0; }
@media (min-width: 720px) { .learn-tiles { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.learn-tile {
  display: grid; gap: var(--s2); align-content: start; min-width: 0; min-height: 104px; padding: var(--s4);
  border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); color: var(--ink); text-decoration: none;
}
.learn-tile:hover { border-color: var(--line-strong); background: var(--surface-2); }
.learn-tile > .icon { width: 24px; height: 24px; color: var(--brand); }
.learn-tile-title { font-weight: 600; line-height: 1.3; }
.learn-tile-sub { font-size: var(--fs-sm); color: var(--muted); line-height: 1.4; }
.learn-guides .list-item { align-items: start; }
.learn-guides .list-ico { margin-top: 2px; }
.learn-guides .list-end { align-self: center; }
.learn-guides .list-sub { line-height: 1.45; }

/* ───────────────────────── 8. Phân trang trước / sau ───────────────────────── */
.learn-pager { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s3); padding-top: var(--s4); border-top: 1px solid var(--line); min-width: 0; }
.learn-pager-item {
  display: grid; gap: 2px; align-content: center; min-width: 0; min-height: 64px; padding: var(--s2) var(--s3);
  border: 1.5px solid var(--line-strong); border-radius: var(--r-lg); background: var(--surface); color: var(--ink); text-decoration: none;
}
a.learn-pager-item:hover { border-color: var(--ink); background: var(--surface-2); }
.learn-pager-item.is-next { text-align: right; justify-items: end; grid-column: 2; }
.learn-pager-dir { display: inline-flex; align-items: center; gap: 2px; font-size: var(--fs-xs); font-weight: 600; color: var(--muted); }
.learn-pager-title { font-weight: 600; font-size: 0.95rem; line-height: 1.3; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
.learn-pager-item.is-off { border-style: dashed; color: var(--muted); }
.learn-pager-item.is-off .learn-pager-title { font-weight: 500; }

/* ───────────────────────── 9. Chuyển động ───────────────────────── */
.learn-fc.is-flip { animation: learn-flip 0.2s ease-out; }
.learn-fc.is-slide-next { animation: learn-slide-next 0.18s ease-out; }
.learn-fc.is-slide-prev { animation: learn-slide-prev 0.18s ease-out; }
@keyframes learn-flip { from { transform: perspective(900px) rotateX(-55deg); opacity: 0.35; } }
@keyframes learn-slide-next { from { transform: translateX(22px); opacity: 0.3; } }
@keyframes learn-slide-prev { from { transform: translateX(-22px); opacity: 0.3; } }
@media (prefers-reduced-motion: reduce) {
  .learn-fc.is-flip, .learn-fc.is-slide-next, .learn-fc.is-slide-prev { animation: none; }
  .learn-week-chev, .learn-grade { transition: none; }
  .learn-grade:active { transform: none; }
}