/* =========================================================================
 *  Style ENGINE luyện-thi ([lgkm_luyen_thi course="nail-theory"]).
 *  Phụ thuộc app.css (ltth-style) cho .ltth shell + token màu (--c-*, --r*, --shadow).
 *  CHỈ tải trên trang có shortcode theory → scope .ltth an toàn (không đụng practical).
 *  Mục lục: 0 Tokens · 1 Nút · 2 Header · 3 Học(accordion) · 4 Đáp án(chung) ·
 *           5 Luyện(live) · 6 Kết quả · 7 SEO · 8 Landing · 9 Thi(1-câu/trang) ·
 *           10 Lưới · 11 Reco · 12 A11y/motion.  Mobile-first.
 * ========================================================================= */

/* ── 0. Tokens phụ (ngoài app.css): tint màu lặp + kích thước control.
 *      Sửa 1 chỗ → cả UI đổi. Giá trị = đúng giá trị đang dùng (không đổi hình). */
.ltth {
  --c-primary-tint: #EEF4F5;   /* nền chọn / đáp đúng nhạt (teal)  */
  --c-accent-tint:  #FBEAEE;   /* nền sai / cờ (rose)              */
  --c-accent-ink:   #9a2740;   /* chữ trên nền rose                */
  --c-good-ink:     #0f5f4f;   /* chữ trên nền xanh                */
  --c-soft:         #F8FBFB;   /* nền khối phụ (lifecycle)         */
  --bw: 1.5px;                 /* viền control                     */
  --pill: 999px;
  --tap: 48px;                 /* tap target tối thiểu             */
  --focus-c: rgba(47,93,98,.45);
}
.ltth.ltth-theory { width: 100%; max-width: 940px; }

/* ── 1. Nút hành động chính (CTA) ── */
.ltth .ltth-cta {
  appearance: none; cursor: pointer; font-family: inherit; font-weight: 800; font-size: 1rem;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: var(--tap);
  background: linear-gradient(135deg, var(--c-accent), #c8456a); color: #fff; border: none;
  border-radius: var(--r-sm); padding: 12px 20px; line-height: 1.2; text-align: center; min-width: 0; max-width: 100%;
  white-space: normal; overflow-wrap: anywhere;
  transition: box-shadow .15s, transform .08s;
}
.ltth .ltth-cta:hover { box-shadow: 0 6px 18px rgba(217,85,111,.3); }
.ltth .ltth-cta:active { transform: scale(.98); }
.ltth .ltth-cta:focus-visible { outline: 3px solid rgba(217,85,111,.45); outline-offset: 2px; }

/* ── 2. Header phụ + toggle ngôn ngữ (trên nền gradient) ── */
.ltth .ltth-head.sm { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px; text-align: center; }
.ltth .ltth-head-title { min-width: 0; display: grid; gap: 3px; justify-items: center; }
.ltth .ltth-head.sm h3 { min-width: 0; margin: 0; font-size: clamp(.95rem, 4.6vw, 1.08rem); line-height: 1.22; overflow-wrap: anywhere; text-align: center; }
.ltth .ltth-th-sub { display: block; font-size: .82rem; color: rgba(255,255,255,.88); }
.ltth .ltth-head.sm .ltth-vi-toggle { appearance: none; cursor: pointer; flex: 0 0 auto; display: inline-grid; grid-template-columns: 1fr 1fr; gap: 2px; min-height: 38px; padding: 3px; background: rgba(255,255,255,.18); color: #fff; border: 1px solid rgba(255,255,255,.52); border-radius: var(--pill); font: inherit; font-size: .76rem; font-weight: 850; white-space: nowrap; }
.ltth .ltth-head.sm .ltth-vi-toggle:hover { background: rgba(255,255,255,.28); }
.ltth .ltth-head.sm .ltth-vi-toggle span { display: grid; place-items: center; min-width: 74px; min-height: 30px; padding: 0 9px; border-radius: var(--pill); color: rgba(255,255,255,.88); }
.ltth .ltth-head.sm .ltth-vi-toggle span.on { background: #fff; color: var(--c-primary); box-shadow: 0 2px 8px rgba(0,0,0,.1); }
.ltth .ltth-th-body { padding: 13px 14px 18px; overflow-x: hidden; max-width: 100%; }
.ltth .ltth-th-hint { font-size: .9rem; color: var(--c-muted); margin: 0 0 12px; }

/* ── 3. HỌC — accordion câu hỏi ── */
.ltth .ltth-learn-top { display: flex; align-items: end; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.ltth .ltth-learn-top > div { min-width: 0; }
.ltth .ltth-learn-top strong { display: block; font-size: 1.15rem; color: var(--c-primary); line-height: 1.1; }
.ltth .ltth-learn-top .ltth-btn { flex: 0 0 auto; min-height: 40px; padding: 7px 12px; font-size: .86rem; }
.ltth .ltth-learn-filter { flex: 0 1 230px; display: grid; gap: 5px; min-width: 170px; font-weight: 850; color: var(--c-primary); }
.ltth .ltth-learn-filter span { font-size: .74rem; line-height: 1.2; color: var(--c-muted); text-transform: uppercase; letter-spacing: .04em; }
.ltth .ltth-learn-filter select { appearance: none; width: 100%; height: 42px; min-height: 42px; max-height: 42px; padding: 0 34px 0 11px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff linear-gradient(45deg, transparent 50%, var(--c-muted) 50%), linear-gradient(135deg, var(--c-muted) 50%, transparent 50%); background-position: calc(100% - 16px) 18px, calc(100% - 11px) 18px; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; color: var(--c-ink); font: inherit; font-size: .92rem; font-weight: 750; line-height: 1.2; }
.ltth .ltth-learn-round { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 0 0 8px; padding: 9px 11px; border-radius: var(--r-sm); background: var(--c-primary-tint); color: var(--c-primary); }
.ltth .ltth-learn-round b { font-size: .9rem; line-height: 1.2; overflow-wrap: anywhere; }
.ltth .ltth-learn-round span { color: var(--c-muted); font-size: .8rem; font-weight: 800; text-align: right; line-height: 1.25; }
.ltth .ltth-learn-bar { margin: -2px 0 8px; }
.ltth .ltth-study-card { border: 1px solid var(--c-line); border-radius: var(--r-sm); background: var(--c-surface); padding: 14px; box-shadow: var(--shadow); }
.ltth .ltth-study-meta { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 7px; color: var(--c-muted); font-size: .76rem; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.ltth .ltth-study-card .ltth-choices.live { margin-top: 4px; }
.ltth .ltth-learn-audio-row { display: flex; align-items: center; justify-content: flex-start; min-height: 36px; margin: -4px 0 8px; }
.ltth .ltth-learn-audio-row .ltth-audio-btn { margin: 0; }
.ltth .ltth-audio-empty { display: inline-flex; align-items: center; min-height: 34px; padding: 6px 10px; border-radius: var(--pill); background: var(--c-soft); color: var(--c-muted); font-size: .82rem; font-weight: 750; }
.ltth .ltth-study-card .ltth-learn-reveal { width: 100%; margin-top: 12px; }
.ltth .ltth-learn-answer { margin-top: 12px; border-top: 1px dashed var(--c-line); padding-top: 12px; }
.ltth .ltth-learn-ok { margin-bottom: 8px; padding: 10px 12px; border-radius: var(--r-sm); background: var(--c-good-bg); color: var(--c-good-ink); line-height: 1.45; }
.ltth .ltth-learn-toast { margin-top: 10px; padding: 9px 12px; border-radius: var(--r-sm); background: var(--c-primary-tint); color: var(--c-primary); font-size: .9rem; font-weight: 800; }
.ltth .ltth-learn-actions { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1fr) minmax(0, 1.1fr); gap: 8px; margin-top: 10px; position: sticky; bottom: 0; z-index: 2; background: var(--c-surface); padding: 8px 0; }
.ltth .ltth-learn-actions .ltth-btn, .ltth .ltth-learn-actions .ltth-cta { min-height: var(--tap); min-width: 0; white-space: normal; overflow-wrap: anywhere; }
.ltth .ltth-learn-actions .ltth-btn[disabled] { opacity: .45; cursor: not-allowed; }
.ltth .ltth-learn-extra-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 2px; }
.ltth .ltth-learn-extra-actions .ltth-btn { width: 100%; min-height: var(--tap); min-width: 0; white-space: normal; overflow-wrap: anywhere; }
.ltth .ltth-learn-pager { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: 8px; margin: 10px 0; padding: 8px 0; }
.ltth .ltth-learn-pager span { color: var(--c-muted); font-size: .86rem; font-weight: 800; white-space: nowrap; }
.ltth .ltth-learn-pager .ltth-btn { min-height: 42px; min-width: 0; white-space: normal; overflow-wrap: anywhere; }
.ltth .ltth-learn-pager .ltth-btn[disabled] { opacity: .45; cursor: not-allowed; }
.ltth .ltth-q { border: 1px solid var(--c-line); border-radius: var(--r-sm); margin-bottom: 10px; background: var(--c-surface); overflow: hidden; }
.ltth .ltth-q > summary { cursor: pointer; list-style: none; padding: 13px 15px; font-weight: 700; line-height: 1.45; }
.ltth .ltth-q > summary::-webkit-details-marker { display: none; }
.ltth .ltth-q[open] > summary { border-bottom: 1px solid var(--c-line); }
.ltth .ltth-q.miss > summary { background: var(--c-warn-bg); }
.ltth .ltth-qn { font-weight: 800; color: var(--c-primary); margin-right: 4px; }
.ltth .ltth-topic { display: inline-block; font-size: .68rem; font-weight: 700; padding: 1px 8px; border-radius: var(--pill); margin-left: 6px; background: var(--c-primary-tint); color: var(--c-primary); vertical-align: middle; }

/* ── 4. Danh sách đáp án (HỌC: reveal · LUYỆN/THI: chọn) ── */
.ltth .ltth-choices { list-style: none; margin: 0; padding: 0; }
.ltth .ltth-choices.reveal { padding: 10px 15px; }
.ltth .ltth-choices.reveal li { padding: 8px 12px; border-radius: 8px; margin-bottom: 6px; background: var(--c-bg); line-height: 1.45; }
.ltth .ltth-choices.reveal li.ok { background: var(--c-good-bg); color: var(--c-good-ink); font-weight: 700; }
.ltth .ltth-tick { color: var(--c-good); font-weight: 800; }
.ltth .ltth-explain { padding: 11px 15px 14px; font-size: .94rem; line-height: 1.55; color: #4d4356; background: #FAF7FB; border-top: 1px dashed var(--c-line); }
.ltth .ltth-src { display: inline-block; margin-left: 6px; font-size: .82rem; font-weight: 700; color: var(--c-primary); text-decoration: none; white-space: nowrap; }
.ltth .ltth-src:hover { text-decoration: underline; }

.ltth .ltth-choices.live { display: grid; gap: 8px; }
.ltth .ltth-choice { appearance: none; cursor: pointer; font-family: inherit; text-align: left; line-height: 1.4;
  display: flex; align-items: center; gap: 11px; min-height: var(--tap); padding: 11px 14px;
  border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: var(--c-surface); color: var(--c-ink);
  transition: border-color .12s, background .12s; }
.ltth .ltth-choice:hover { border-color: var(--c-primary2); }
.ltth .ltth-choice.sel { border-color: var(--c-primary); background: var(--c-primary-tint); font-weight: 700; }
.ltth .ltth-choice.ok { border-color: var(--c-good); background: var(--c-good-bg); color: var(--c-good-ink); font-weight: 700; }
.ltth .ltth-choice.wrong { border-color: var(--c-accent); background: var(--c-accent-tint); color: var(--c-accent-ink); }
.ltth .ltth-choice:disabled { cursor: default; opacity: 1; }
/* badge chữ cái A/B/C/D */
.ltth .ltth-choice-letter { flex: 0 0 auto; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  border: var(--bw) solid var(--c-line); font-size: .82rem; font-weight: 800; color: var(--c-muted); background: #fff; }
.ltth .ltth-choice.sel .ltth-choice-letter { border-color: var(--c-primary); color: var(--c-primary); }
.ltth .ltth-choice.ok .ltth-choice-letter { border-color: var(--c-good); color: var(--c-good); }
.ltth .ltth-choice.wrong .ltth-choice-letter { border-color: var(--c-accent); color: var(--c-accent); }
.ltth .ltth-choice span:last-child { overflow-wrap: anywhere; }

/* ── 5. LUYỆN (1 câu/trang) — câu sống + feedback ── */
.ltth .ltth-practice-screen { min-height: 0; }
.ltth .ltth-q-live { margin-bottom: 16px; }
.ltth .ltth-q-text { margin: 0 0 10px; font-size: 1.16rem; font-weight: 700; line-height: 1.38; color: var(--c-ink); outline: none; overflow-wrap: anywhere; }
.ltth .ltth-explain-live { margin-top: 12px; font-size: .94rem; line-height: 1.55; }
.ltth .ltth-answer-card { padding: 13px 14px; border: 1px solid var(--c-line); border-radius: var(--r-sm); background: var(--c-soft); }
.ltth .ltth-answer-card.is-correct { border-color: #BFE7DC; background: var(--c-good-bg); }
.ltth .ltth-answer-card.is-wrong { border-color: #F0C8D1; background: #FFF7F8; }
.ltth .ltth-answer-head { display: grid; gap: 4px; margin-bottom: 10px; }
.ltth .ltth-answer-head strong { color: var(--c-ink); line-height: 1.4; overflow-wrap: anywhere; }
.ltth .ltth-answer-kicker { font-size: .82rem; font-weight: 900; text-transform: uppercase; letter-spacing: .03em; }
.ltth .ltth-answer-card.is-correct .ltth-answer-kicker { color: var(--c-good); }
.ltth .ltth-answer-card.is-wrong .ltth-answer-kicker { color: var(--c-accent); }
.ltth .ltth-answer-explain { margin-top: 2px; color: #4d4356; overflow-wrap: anywhere; }
.ltth .ltth-answer-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.ltth .ltth-answer-actions .ltth-btn { min-height: 40px; padding: 8px 12px; font-size: .88rem; }
.ltth .ltth-answer-actions .ltth-btn[disabled] { opacity: .6; cursor: default; }
.ltth .ltth-answer-actions-loop { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: stretch; }
.ltth .ltth-answer-actions-loop .ltth-cta,
.ltth .ltth-answer-actions-loop .ltth-btn { width: 100%; min-height: var(--tap); margin-top: 0; }
.ltth .ltth-answer-actions-loop .ltth-answer-toast { grid-column: 1 / -1; }
.ltth .ltth-answer-toast { color: var(--c-primary); font-size: .86rem; font-weight: 800; }
.ltth .ltth-feedback { margin-top: 12px; padding-top: 10px; border-top: 1px dashed rgba(47,93,98,.18); text-align: left; }
.ltth .ltth-q > .ltth-feedback { margin: 0 14px 14px; }
.ltth .ltth-feedback .ltth-mini-link { min-height: 36px; border-color: rgba(225,69,105,.22); color: var(--c-accent-ink); }
.ltth .ltth-feedback-box { display: grid; gap: 9px; margin-top: 9px; padding: 11px; border: 1px solid rgba(225,69,105,.20); border-radius: var(--r-sm); background: #fff; }
.ltth .ltth-feedback-box[hidden] { display: none; }
.ltth .ltth-feedback-box label { display: grid; gap: 5px; color: var(--c-primary); font-weight: 850; }
.ltth .ltth-feedback-box label span { color: var(--c-muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .04em; }
.ltth .ltth-feedback-box select,
.ltth .ltth-feedback-box textarea { width: 100%; min-width: 0; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff; color: var(--c-ink); font: inherit; font-size: .94rem; }
.ltth .ltth-feedback-box select { min-height: 42px; padding: 8px 10px; }
.ltth .ltth-feedback-box textarea { padding: 9px 10px; resize: vertical; line-height: 1.45; }
.ltth .ltth-feedback-disclaimer { margin: -2px 0 0; color: var(--c-muted); font-size: .78rem; line-height: 1.35; }
.ltth .ltth-feedback-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.ltth .ltth-feedback-actions .ltth-btn { min-height: 40px; padding: 8px 12px; font-size: .88rem; }
.ltth .ltth-feedback-status { color: var(--c-primary); font-size: .86rem; font-weight: 800; }
.ltth .ltth-content-signal { margin: 12px 0 14px; padding: 12px; border: 1px solid rgba(47,93,98,.16); border-radius: var(--r-sm); background: linear-gradient(135deg, #fff, var(--c-soft)); text-align: left; }
.ltth .ltth-content-signal-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.ltth .ltth-content-signal-head > div { min-width: 0; display: grid; gap: 3px; }
.ltth .ltth-content-signal-head span { color: var(--c-muted); font-size: .72rem; font-weight: 900; letter-spacing: .05em; }
.ltth .ltth-content-signal-head strong { color: var(--c-primary); font-size: .98rem; line-height: 1.25; }
.ltth .ltth-content-signal-head p { margin: 0; color: var(--c-muted); font-size: .86rem; line-height: 1.4; }
.ltth .ltth-content-signal .ltth-mini-link { flex: 0 0 auto; min-height: 38px; }
.ltth .ltth-content-signal-box { display: grid; gap: 9px; margin-top: 10px; padding: 11px; border: 1px solid rgba(47,93,98,.16); border-radius: var(--r-sm); background: #fff; }
.ltth .ltth-content-signal-box[hidden] { display: none; }
.ltth .ltth-content-signal-box label { display: grid; gap: 5px; color: var(--c-primary); font-weight: 850; }
.ltth .ltth-content-signal-box label span { color: var(--c-muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .04em; }
.ltth .ltth-content-signal-box select,
.ltth .ltth-content-signal-box textarea { width: 100%; min-width: 0; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff; color: var(--c-ink); font: inherit; font-size: .94rem; }
.ltth .ltth-content-signal-box select { min-height: 42px; padding: 8px 10px; }
.ltth .ltth-content-signal-box textarea { padding: 9px 10px; resize: vertical; line-height: 1.45; }
.ltth .ltth-content-status { color: var(--c-primary); font-size: .86rem; font-weight: 800; }
.ltth .ltth-hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; opacity: 0; pointer-events: none; }
.ltth .ltth-th-progress { font-size: .86rem; color: var(--c-muted); margin-bottom: 12px; font-weight: 700; }
.ltth .ltth-th-next { margin-top: 14px; width: 100%; }
.ltth .ltth-audio-btn { min-height: 38px; margin: 0 0 10px; padding: 7px 12px; font-size: .84rem; }
.ltth .ltth-audio-btn.is-playing { background: var(--c-primary); border-color: var(--c-primary); color: #fff; box-shadow: 0 6px 16px rgba(47,93,98,.20); }
.ltth .ltth-q > .ltth-audio-btn { margin-left: 15px; margin-top: 10px; }
.ltth .ltth-explain-live .ltth-audio-btn { display: inline-flex; margin: 0 0 8px; }

/* ── 6. KẾT QUẢ ── */
.ltth .ltth-result { text-align: center; padding: 22px 16px; border-radius: var(--r); background: var(--c-bg); border: 1px solid var(--c-line); margin-bottom: 8px; }
.ltth .ltth-result .big { font-size: 1.5rem; font-weight: 800; margin-bottom: 4px; }
.ltth .ltth-result.pass { background: var(--c-good-bg); border-color: #BFE7DC; }
.ltth .ltth-result.pass .big { color: var(--c-good); }
.ltth .ltth-result.fail { background: var(--c-warn-bg); border-color: #F0DDBB; }
.ltth .ltth-result.fail .big { color: var(--c-warn); }
/* nút hành động ở màn kết quả: xếp DỌC, full-width, cách nhau rõ (tránh dính ngang trên mobile) */
.ltth .ltth-result .ltth-cta { display: flex; width: 100%; margin-top: 10px; }
.ltth .ltth-result-exam { display: grid; gap: 10px; }
.ltth .ltth-result-review { display: grid; gap: 10px; }
.ltth .ltth-result-review .big { margin-bottom: 0; }
.ltth .ltth-result-review .ltth-result-note { margin: 0; color: var(--c-muted); font-size: .9rem; line-height: 1.45; }
.ltth .ltth-result-score { display: grid; gap: 3px; padding: 12px 14px; border-radius: var(--r-sm); background: rgba(255,255,255,.72); border: 1px solid rgba(255,255,255,.82); }
.ltth .ltth-result-score b { display: block; font-size: 2rem; line-height: 1; color: var(--c-primary); }
.ltth .ltth-result-score span { display: block; color: var(--c-ink); font-weight: 750; line-height: 1.35; overflow-wrap: anywhere; }
.ltth .ltth-result-actions { display: grid; gap: 8px; }
.ltth .ltth-result-actions .ltth-btn, .ltth .ltth-result-actions .ltth-cta { width: 100%; min-height: var(--tap); margin-top: 0; }
.ltth .ltth-result-breakdown { display: grid; gap: 8px; text-align: left; padding: 12px; border-radius: var(--r-sm); background: rgba(255,255,255,.66); border: 1px solid rgba(255,255,255,.82); }
.ltth .ltth-result-breakdown-h { font-size: .78rem; font-weight: 900; color: var(--c-primary); text-transform: uppercase; letter-spacing: .05em; }
/* Native app ads: chỉ đặt ở điểm nghỉ (landing/result), không chen giữa câu hỏi/đáp án. */
.ltth .ltth-app-ad { box-sizing: border-box; clear: both; width: 100%; margin: 14px 0; padding: 12px; border: 1px solid var(--c-line); border-radius: var(--r-sm); background: #FBFCFC; box-shadow: 0 1px 4px rgba(23,49,53,.05); }
.ltth .ltth-app-adlabel { margin: 0 0 7px; text-align: center; color: var(--c-muted); font-size: .68rem; line-height: 1; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.ltth .ltth-app-adinner { min-height: 78px; text-align: center; }
.ltth .ltth-app-adinner ins.adsbygoogle { display: block !important; margin-left: auto !important; margin-right: auto !important; }
.ltth .ltth-app-ad[data-ltth-app-ad-zone="mock_result"],
.ltth .ltth-app-ad[data-ltth-app-ad-zone="practice_result"],
.ltth .ltth-app-ad[data-ltth-app-ad-zone="review_result"] { margin-top: 10px; margin-bottom: 16px; }
.ltth .ltth-break-row { appearance: none; cursor: pointer; display: grid; grid-template-columns: minmax(0, 1fr) 84px; gap: 10px; align-items: center; width: 100%; padding: 9px 10px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff; color: var(--c-ink); font: inherit; text-align: left; }
.ltth .ltth-break-row:hover { border-color: var(--c-primary2); }
.ltth .ltth-break-row span { min-width: 0; display: grid; gap: 2px; }
.ltth .ltth-break-row b { font-size: .9rem; line-height: 1.25; overflow-wrap: anywhere; }
.ltth .ltth-break-row i { font-style: normal; color: var(--c-muted); font-size: .8rem; font-weight: 800; }
.ltth .ltth-break-row em { display: block; height: 8px; border-radius: var(--pill); background: var(--c-line); overflow: hidden; }
.ltth .ltth-break-row em i { display: block; height: 100%; background: var(--c-primary); border-radius: var(--pill); }
.ltth .ltth-break-weak { margin: 2px 0 0; color: var(--c-accent-ink); font-size: .86rem; font-weight: 850; text-align: center; }
.ltth .ltth-th-reviewh { margin: 22px 0 10px; }
.ltth .ltth-pretag { font-size: .7rem; font-weight: 700; color: #8a6d00; background: #fff3cd; border-radius: 6px; padding: 1px 6px; margin-left: 4px; white-space: nowrap; }

/* ── 7. SEO server-side: Về kỳ thi + blueprint cards + FAQ ── */
.ltth .ltth-bp-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 12px 0 6px; }
.ltth .ltth-bp-card { border: 1px solid var(--c-line); border-radius: var(--r-sm); padding: 12px 14px; background: var(--c-surface); }
.ltth .ltth-bp-pct { font-size: 1.6rem; font-weight: 800; color: var(--c-primary); line-height: 1.1; }
.ltth .ltth-bp-name { font-weight: 700; margin: 2px 0; }
.ltth .ltth-bp-n { font-size: .82rem; color: var(--c-muted); }
.ltth .ltth-faq { margin: 8px 0; }
.ltth .ltth-faq-item { border: 1px solid var(--c-line); border-radius: var(--r-sm); margin-bottom: 8px; background: var(--c-surface); }
.ltth .ltth-faq-item > summary { cursor: pointer; padding: 12px 14px; font-weight: 700; list-style: none; }
.ltth .ltth-faq-item > summary::-webkit-details-marker { display: none; }
.ltth .ltth-faq-item > summary::before { content: "＋"; color: var(--c-primary); font-weight: 800; margin-right: 8px; }
.ltth .ltth-faq-item[open] > summary::before { content: "－"; }
.ltth .ltth-faq-item > div { padding: 0 14px 14px; color: var(--c-ink); }
.ltth .ltth-seo-disc { margin-top: 16px; color: var(--c-muted); line-height: 1.5; }
.ltth .ltth-sell-points { margin: 14px 0 16px; padding: 14px 16px; border: 1px solid rgba(225,69,105,.20); border-radius: var(--r-sm); background: #FFF7FA; }
.ltth .ltth-sell-points h3 { margin: 0 0 8px; color: var(--c-primary); font-size: 1rem; }
.ltth .ltth-sell-points ul { margin: 0; padding-left: 20px; font-size: .92rem; line-height: 1.5; }
.ltth .ltth-sell-points li { margin: 5px 0; }

/* ── 8. LANDING (hero · stats · mode cards · topic-pick · lifecycle) ── */
.ltth .ltth-home-back { appearance: none; cursor: pointer; background: none; border: none; font: inherit; color: var(--c-muted); font-weight: 700; padding: 4px 0; margin-bottom: 10px; }
.ltth .ltth-home-back:hover { color: var(--c-primary); }

.ltth .ltth-hero { text-align: center; padding: 6px 4px 4px; }
.ltth .ltth-hero h2 { margin: 0 0 6px; font-size: 1.3rem; font-weight: 800; color: var(--c-ink); line-height: 1.25; overflow-wrap: anywhere; }
.ltth .ltth-hero p { margin: 0 auto; max-width: 36em; color: var(--c-muted); font-size: .94rem; line-height: 1.5; overflow-wrap: anywhere; }
/* dòng "sẵn sàng thi" (derived từ lịch sử mock) */
.ltth .ltth-ready { margin: 10px 0 0; padding: 8px 12px; border-radius: var(--r-sm); background: var(--c-primary-tint); color: var(--c-primary); font-size: .86rem; font-weight: 700; text-align: center; }
.ltth .ltth-pass-card { display: grid; gap: 12px; margin: 12px 0 0; padding: 14px; border: 1px solid rgba(47,93,98,.18); border-radius: 18px; background: linear-gradient(180deg, #fff, #F6FBFA); box-shadow: 0 8px 22px rgba(23,49,53,.07); }
.ltth .ltth-pass-main { display: grid; grid-template-columns: 86px minmax(0,1fr); gap: 12px; align-items: center; }
.ltth .ltth-pass-meter { position: relative; display: grid; place-items: center; width: 80px; height: 80px; border-radius: 22px; overflow: hidden; background: var(--c-primary-tint); color: var(--c-primary); border: 1px solid rgba(47,93,98,.14); }
.ltth .ltth-pass-meter span { position: relative; z-index: 1; font-size: 1.12rem; font-weight: 950; letter-spacing: -.02em; }
.ltth .ltth-pass-meter i { position: absolute; left: 0; right: auto; bottom: 0; height: 7px; max-width: 100%; border-radius: 0 var(--pill) var(--pill) 0; background: var(--c-accent); }
.ltth .ltth-pass-ready .ltth-pass-meter { background: var(--c-good-bg); color: var(--c-good-ink); }
.ltth .ltth-pass-ready .ltth-pass-meter i { background: var(--c-good); }
.ltth .ltth-pass-almost_ready .ltth-pass-meter i { background: #E3A936; }
.ltth .ltth-pass-needs_work .ltth-pass-meter i { background: var(--c-accent); }
.ltth .ltth-pass-copy { min-width: 0; display: grid; gap: 3px; }
.ltth .ltth-pass-copy strong { display: block; color: var(--c-primary); font-size: 1.08rem; line-height: 1.22; overflow-wrap: anywhere; }
.ltth .ltth-pass-copy p { margin: 0; color: var(--c-ink); font-size: .91rem; line-height: 1.42; }
.ltth .ltth-pass-copy small { display: block; margin-top: 2px; color: var(--c-muted); font-size: .76rem; line-height: 1.35; }
.ltth .ltth-pass-evidence { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 7px; }
.ltth .ltth-pass-evidence span { min-width: 0; padding: 8px 9px; border: 1px solid rgba(47,93,98,.12); border-radius: 13px; background: rgba(255,255,255,.88); }
.ltth .ltth-pass-evidence b { display: block; color: #293f43; font-size: .86rem; line-height: 1.15; overflow-wrap: anywhere; }
.ltth .ltth-pass-evidence em { display: block; margin-top: 2px; color: var(--c-muted); font-style: normal; font-size: .64rem; font-weight: 900; letter-spacing: .045em; text-transform: uppercase; line-height: 1.15; }
.ltth .ltth-pass-actions { display: grid; grid-template-columns: minmax(0,1fr); gap: 8px; padding-top: 2px; }
.ltth .ltth-pass-actions > div { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; color: var(--c-primary); }
.ltth .ltth-pass-actions > div b { font-size: .9rem; line-height: 1.2; }
.ltth .ltth-pass-actions > div span { color: var(--c-muted); font-size: .78rem; font-weight: 850; text-align: right; }
.ltth .ltth-pass-action { appearance: none; cursor: pointer; display: grid; gap: 2px; min-height: var(--tap); width: 100%; padding: 10px 12px; border: 1px solid rgba(217,85,111,.28); border-radius: 14px; background: #fff; color: var(--c-accent-ink); font: inherit; text-align: left; box-shadow: 0 2px 8px rgba(154,39,64,.04); }
.ltth .ltth-pass-action:hover { border-color: var(--c-accent); background: #FFF8FA; }
.ltth .ltth-pass-action:focus-visible { outline: 3px solid rgba(217,85,111,.32); outline-offset: 2px; }
.ltth .ltth-pass-action b { font-size: .91rem; line-height: 1.18; }
.ltth .ltth-pass-action span { color: #7a4050; font-size: .76rem; font-weight: 850; line-height: 1.25; }
@media (min-width: 681px) {
  .ltth .ltth-pass-actions { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ltth .ltth-pass-actions > div { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .ltth .ltth-pass-card { padding: 13px 12px; }
  .ltth .ltth-pass-main { grid-template-columns: 68px minmax(0,1fr); gap: 10px; }
  .ltth .ltth-pass-meter { width: 64px; height: 64px; border-radius: 18px; }
  .ltth .ltth-pass-meter span { font-size: .98rem; }
  .ltth .ltth-pass-evidence { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
.ltth .ltth-progress-card { display: grid; gap: 11px; margin: 12px 0 0; padding: 14px; border: 1px solid rgba(47,93,98,.16); border-radius: 18px; background: linear-gradient(180deg, #fff, #F6FBFA); box-shadow: 0 6px 18px rgba(47,93,98,.08); }
.ltth .ltth-progress-head { display: block; }
.ltth .ltth-progress-card strong { display: block; margin: 2px 0 4px; color: var(--c-primary); font-size: 1.08rem; line-height: 1.22; letter-spacing: -.01em; }
.ltth .ltth-progress-card p { margin: 0; color: var(--c-muted); font-size: .9rem; line-height: 1.45; }
.ltth .ltth-progress-pills { display: flex; flex-wrap: wrap; gap: 7px; }
.ltth .ltth-progress-pills span { flex: 1 1 88px; min-width: 0; padding: 8px 10px; border: 1px solid rgba(47,93,98,.12); border-radius: 13px; background: rgba(255,255,255,.86); }
.ltth .ltth-progress-pills b { display: block; color: #293f43; font-size: .96rem; line-height: 1.15; overflow-wrap: anywhere; }
.ltth .ltth-progress-pills em { display: block; margin-top: 2px; color: var(--c-muted); font-style: normal; font-size: .68rem; font-weight: 900; letter-spacing: .045em; text-transform: uppercase; line-height: 1.15; }
.ltth .ltth-progress-detail { border-top: 1px solid rgba(47,93,98,.1); padding-top: 2px; }
.ltth .ltth-progress-detail summary { cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 38px; color: var(--c-primary); font-weight: 900; list-style: none; }
.ltth .ltth-progress-detail summary::-webkit-details-marker { display: none; }
.ltth .ltth-progress-detail summary:after { content: "＋"; flex: 0 0 auto; color: var(--c-accent-ink); font-weight: 900; }
.ltth .ltth-progress-detail[open] summary:after { content: "−"; }
.ltth .ltth-progress-detail summary span { font-size: .88rem; }
.ltth .ltth-progress-detail summary small { color: var(--c-muted); font-size: .78rem; font-weight: 800; text-align: right; }
.ltth .ltth-progress-revisit-head span { display: block; margin-bottom: 3px; color: var(--c-muted); font-size: .7rem; font-weight: 900; letter-spacing: .055em; text-transform: uppercase; }
.ltth .ltth-progress-weak { display: grid; gap: 8px; }
.ltth .ltth-progress-weak-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.ltth .ltth-progress-weak-chip { min-width: 0; padding: 9px 10px; border: 1px solid rgba(47,93,98,.14); border-radius: 14px; background: #fff; color: #293f43; box-shadow: 0 2px 8px rgba(47,93,98,.04); }
.ltth .ltth-progress-weak-grid .ltth-progress-weak-chip { flex: 1 1 120px; }
.ltth .ltth-progress-weak-chip b { display: block; color: var(--c-primary); font-size: .86rem; line-height: 1.18; overflow-wrap: anywhere; }
.ltth .ltth-progress-weak-chip span { display: block; margin-top: 3px; color: var(--c-muted); font-size: .76rem; font-weight: 850; line-height: 1.25; }
.ltth .ltth-progress-revisit { display: grid; gap: 8px; padding-top: 1px; }
.ltth .ltth-progress-revisit-head { display: flex; align-items: end; justify-content: space-between; gap: 8px; }
.ltth .ltth-progress-revisit-head strong { margin: 0; font-size: .9rem; color: var(--c-accent-ink); }
.ltth .ltth-progress-top { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.ltth .ltth-progress-q { appearance: none; cursor: pointer; display: grid; gap: 2px; min-height: 48px; padding: 9px 10px; border-radius: 14px; background: #fff; border: 1px solid #F0C8D1; color: var(--c-accent-ink); font: inherit; text-align: left; box-shadow: 0 2px 8px rgba(154,39,64,.05); }
.ltth .ltth-progress-top .ltth-progress-q { min-width: 0; width: 100%; }
.ltth .ltth-progress-q:hover { border-color: var(--c-accent); background: #FFF8FA; }
.ltth .ltth-progress-q:focus-visible { outline: 3px solid rgba(217,85,111,.32); outline-offset: 2px; }
.ltth .ltth-progress-q b { font-size: .94rem; line-height: 1.1; }
.ltth .ltth-progress-q span { color: #7a4050; font-size: .78rem; font-weight: 850; }
@media (max-width: 560px) {
  .ltth .ltth-progress-card { padding: 14px 12px; }
  .ltth .ltth-progress-pills span { flex-basis: calc(50% - 4px); }
  .ltth .ltth-progress-revisit-head { display: grid; gap: 1px; }
  .ltth .ltth-progress-detail summary { align-items: center; }
  .ltth .ltth-progress-detail summary span,
  .ltth .ltth-progress-detail summary small { white-space: nowrap; }
  .ltth .ltth-progress-detail summary small { max-width: none; line-height: 1.2; }
  .ltth .ltth-content-signal-head { display: grid; align-items: start; }
  .ltth .ltth-content-signal .ltth-mini-link { width: 100%; justify-content: center; }
}
.ltth .ltth-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin: 16px 0; }
.ltth .ltth-stat { border: 1px solid var(--c-line); border-radius: var(--r-sm); padding: 12px 6px; text-align: center; background: var(--c-surface); }
.ltth .ltth-stat-n { font-size: 1.35rem; font-weight: 800; color: var(--c-primary); line-height: 1.1; }
.ltth .ltth-stat-l { font-size: .68rem; color: var(--c-muted); text-transform: uppercase; letter-spacing: .03em; margin-top: 3px; overflow-wrap: anywhere; }
@media (max-width: 560px) { .ltth .ltth-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.ltth .ltth-freebar { margin: 12px 0 2px; padding: 11px 14px; border: 1px solid #F0DDBB; border-radius: var(--r-sm); background: var(--c-warn-bg); color: var(--c-ink); font-size: .9rem; line-height: 1.5; }
.ltth .ltth-freebar b { color: var(--c-primary); }
.ltth .ltth-step-card { margin: 14px 0; padding: 16px; border: 1px solid rgba(47,93,98,.18); border-radius: var(--r); background: linear-gradient(180deg, #fff, #FBFEFD); box-shadow: 0 8px 24px rgba(23,49,53,.05); }
.ltth .ltth-step-head { display: grid; gap: 5px; margin-bottom: 12px; }
.ltth .ltth-step-kicker { width: fit-content; padding: 5px 9px; border-radius: var(--pill); background: var(--c-primary-tint); color: var(--c-primary); font-size: .72rem; font-weight: 900; letter-spacing: .04em; text-transform: uppercase; }
.ltth .ltth-step-head h3 { margin: 0; color: var(--c-primary); font-size: 1.1rem; line-height: 1.25; }
.ltth .ltth-step-head p { margin: 0; max-width: 58em; color: var(--c-muted); font-size: .92rem; line-height: 1.5; }
.ltth .ltth-step-card .ltth-progress-card { margin: 12px 0 0; }
.ltth .ltth-step-card .ltth-state-pick { margin: 0 0 10px; }
.ltth .ltth-step-card .ltth-state-note { margin: 0 0 10px; }
.ltth .ltth-sec-k { font-size: .72rem; font-weight: 800; letter-spacing: .06em; color: var(--c-muted); margin: 14px 0 8px; }
/* thẻ chế độ bị khoá cho khách thử (topic/miss): mờ nhẹ + con khoá đã có trong nhãn */
.ltth .ltth-modecard.locked:not(.on) { opacity: .72; }
.ltth .ltth-sec-h { margin: 18px 0 10px; font-size: 1.02rem; color: var(--c-primary); }

.ltth .ltth-modecards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.ltth .ltth-modecard { appearance: none; cursor: pointer; font: inherit; text-align: left; width: 100%;
  display: flex; align-items: center; gap: 12px; padding: 14px 16px; min-height: 84px;
  border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: var(--c-surface); color: var(--c-ink);
  transition: border-color .12s, background .12s; }
.ltth .ltth-modecard:hover { border-color: var(--c-primary2); }
.ltth .ltth-modecard.on { border-color: var(--c-primary); background: var(--c-primary-tint); }
.ltth .ltth-modecard.priority:not(.on) { border-color: rgba(217,85,111,.38); background: linear-gradient(180deg, #FFF, #FFF8FA); }
.ltth .ltth-modecard.priority .ltth-mc-txt em { color: var(--c-accent); }
.ltth .ltth-modecard.empty:not(.on) { background: #FCFDFD; }
.ltth .ltth-mc-radio { flex: 0 0 auto; width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--c-line); position: relative; }
.ltth .ltth-modecard.on .ltth-mc-radio { border-color: var(--c-primary); }
.ltth .ltth-modecard.on .ltth-mc-radio::after { content: ""; position: absolute; inset: 3px; border-radius: 50%; background: var(--c-primary); }
.ltth .ltth-mc-txt { min-width: 0; }
.ltth .ltth-mc-txt b { display: block; font-size: 1rem; font-weight: 800; overflow-wrap: anywhere; }
.ltth .ltth-mc-txt i { display: block; font-style: normal; font-size: .84rem; color: var(--c-muted); margin-top: 2px; overflow-wrap: anywhere; }
.ltth .ltth-mc-txt em { display: block; margin-top: 7px; font-style: normal; color: var(--c-primary); font-size: .78rem; font-weight: 900; }
/* badge số câu "tới hạn" trên thẻ Ôn câu bạn hay sai */
.ltth .ltth-mc-badge { margin-left: auto; flex: 0 0 auto; min-width: 24px; height: 24px; display: inline-grid; place-items: center; padding: 0 7px; border-radius: var(--pill); background: var(--c-accent); color: #fff; font-size: .8rem; font-weight: 800; line-height: 1; }
@media (max-width: 680px) { .ltth .ltth-modecards { grid-template-columns: 1fr; } }

.ltth .ltth-state-pick { margin: 12px 0 10px; padding: 12px 14px; border: 1px solid rgba(47,93,98,.22); border-radius: var(--r-sm); background: var(--c-soft); }
.ltth .ltth-state-pick-h { margin: 0 0 9px; font-weight: 850; color: var(--c-primary); }
.ltth .ltth-state-fields { display: grid; grid-template-columns: minmax(180px, 260px) minmax(220px, 360px); gap: 10px; align-items: end; }
.ltth .ltth-state-pick label { display: grid; gap: 5px; min-width: 0; font-weight: 800; color: var(--c-primary); }
.ltth .ltth-state-pick label span { font-size: .78rem; line-height: 1.2; color: var(--c-muted); }
.ltth .ltth-state-pick select,
.ltth .ltth-state-pick input { width: 100%; min-width: 0; padding: 8px 12px; font: inherit; font-size: 1rem; min-height: 44px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff; color: var(--c-ink); }
.ltth .ltth-state-results { display: grid; gap: 6px; margin-top: 6px; padding: 6px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff; box-shadow: 0 10px 24px rgba(23, 49, 53, .12); }
.ltth .ltth-state-results[hidden] { display: none; }
.ltth .ltth-state-result { appearance: none; cursor: pointer; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: center; min-height: 40px; padding: 8px 10px; border: 1px solid transparent; border-radius: var(--r-sm); background: #fff; color: var(--c-ink); font: inherit; text-align: left; }
.ltth .ltth-state-result:hover, .ltth .ltth-state-result[aria-selected="true"] { border-color: rgba(47,93,98,.24); background: var(--c-soft); }
.ltth .ltth-state-result b { min-width: 0; overflow-wrap: anywhere; font-size: .94rem; }
.ltth .ltth-state-result span { color: var(--c-primary); font-size: .82rem; font-weight: 850; }
.ltth .ltth-state-noresult { padding: 8px 10px; color: var(--c-muted); font-size: .9rem; }
.ltth .ltth-state-note { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; align-items: center; margin: -2px 0 14px; padding: 12px 14px; border: 1px solid #BFE7DC; border-radius: var(--r-sm); background: var(--c-good-bg); color: var(--c-good-ink); }
.ltth .ltth-state-note.locked { border-color: #F0DDBB; background: var(--c-warn-bg); color: var(--c-ink); }
.ltth .ltth-state-note b { display: block; line-height: 1.25; overflow-wrap: anywhere; }
.ltth .ltth-state-note span { display: block; color: var(--c-ink); font-size: .86rem; line-height: 1.4; }
.ltth .ltth-mini-link { appearance: none; cursor: pointer; grid-row: 1 / span 2; grid-column: 2; min-height: 38px; padding: 7px 12px; border: var(--bw) solid rgba(27,158,131,.35); border-radius: var(--pill); background: #fff; color: var(--c-good-ink); font: inherit; font-size: .82rem; font-weight: 850; white-space: nowrap; }
.ltth .ltth-mini-link:hover { border-color: var(--c-good); }
/* Ôn theo nhóm: lưới thẻ nhóm bấm thẳng (thay dropdown ẩn) — thấy hết nhóm + % đề + số câu */
.ltth .ltth-topic-pick { margin: 12px 0 4px; padding: 12px 14px; border: 1px solid rgba(47,93,98,.22); border-radius: var(--r-sm); background: var(--c-soft); }
.ltth .ltth-topic-pick-h { font-weight: 800; color: var(--c-primary); font-size: .9rem; margin-bottom: 10px; }
.ltth .ltth-topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(148px, 1fr)); gap: 8px; }
.ltth .ltth-topic-chip { appearance: none; cursor: pointer; text-align: left; display: flex; flex-direction: column; gap: 3px; min-height: 58px; padding: 10px 12px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: var(--c-surface); color: var(--c-ink); font: inherit; transition: border-color .12s, background .12s; }
.ltth .ltth-topic-chip:hover { border-color: var(--c-primary2); }
.ltth .ltth-topic-chip.on { border-color: var(--c-primary); background: var(--c-primary-tint); box-shadow: inset 0 0 0 1px var(--c-primary); }
.ltth .ltth-topic-chip b { font-size: .92rem; font-weight: 750; line-height: 1.25; overflow-wrap: anywhere; }
.ltth .ltth-topic-chip span { font-size: .78rem; color: var(--c-muted); }
/* Khối mở rộng NGAY DƯỚI thẻ chế độ đã chọn: topic-pick (nếu có) + nút Bắt đầu. Thụt nhẹ + gờ trái teal để "dính" thẻ trên. */
.ltth .ltth-mode-expand { grid-column: 1 / -1; display: grid; gap: 10px; margin: 0 0 4px; padding: 2px 0 2px 10px; border-left: 3px solid var(--c-primary); }
.ltth .ltth-mode-expand .ltth-topic-pick { margin: 0; }
.ltth .ltth-start-btn { width: 100%; margin: 0; }

.ltth .ltth-hy-coach { display: grid; gap: 3px; margin: 10px 0; padding: 10px 12px; border: 1px solid #F0C8D1; border-radius: var(--r-sm); background: #FFF8FA; color: var(--c-ink); }
.ltth .ltth-hy-coach b { color: var(--c-accent-ink); font-size: .88rem; line-height: 1.2; }
.ltth .ltth-hy-coach span { color: var(--c-muted); font-size: .84rem; line-height: 1.42; }

.ltth .ltth-life { margin: 18px 0 2px; padding: 12px 14px; border: 1px solid var(--c-line); border-radius: var(--r-sm); background: var(--c-soft); font-size: .9rem; display: grid; gap: 10px; }
.ltth .ltth-life-row, .ltth .ltth-life-tools, .ltth .ltth-life-upsell { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.ltth .ltth-life-h, .ltth .ltth-life-upsell > span { font-weight: 850; color: var(--c-primary); margin-right: 2px; }
.ltth .ltth-life-link { display: inline-flex; align-items: center; justify-content: center; min-height: 34px; padding: 6px 10px; border: 1px solid rgba(18,105,111,.22); border-radius: var(--pill); background: #fff; color: var(--c-primary); font-weight: 800; line-height: 1.18; text-decoration: none; }
.ltth .ltth-life-link.primary { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.ltth .ltth-life-link.soft { background: #FFF6F8; border-color: rgba(225,69,105,.22); color: var(--c-accent); }
.ltth .ltth-life-link.tool { font-size: .84rem; font-weight: 760; }
.ltth .ltth-life-link:hover { border-color: currentColor; text-decoration: none; }
.ltth .ltth-life-more { border-top: 1px dashed rgba(18,105,111,.18); padding-top: 8px; }
.ltth .ltth-life-more summary { width: fit-content; cursor: pointer; color: var(--c-primary); font-weight: 850; }
.ltth .ltth-life-more summary:focus-visible { outline: 3px solid rgba(18,105,111,.24); outline-offset: 3px; border-radius: var(--r-sm); }
.ltth .ltth-life-tools { margin-top: 8px; }
.ltth .ltth-life-upsell { border-top: 1px dashed rgba(18,105,111,.18); padding-top: 8px; }

/* ── 9. THI THỬ (1 câu/trang) — top bar · tools · nav.  (câu hỏi dùng .ltth-q-text ở mục 5) ── */
.ltth .ltth-exam-top { position: sticky; top: 0; z-index: 3; background: var(--c-surface); padding: 8px 0 10px; margin-bottom: 12px; border-bottom: 1px solid var(--c-line); }
.ltth .ltth-exam-meta { display: flex; align-items: center; justify-content: space-between; flex-wrap: nowrap; gap: 12px; width: 100%; margin-bottom: 8px; }
.ltth .ltth-exam-count { flex: 0 1 auto; min-width: 0; font-weight: 800; color: var(--c-ink); font-size: .95rem; }
/* Đồng hồ = chip riêng (nền pill + icon) → luôn tách khỏi số câu, dễ nhận trên mobile */
.ltth .ltth-th-clock { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 5px;
  font-variant-numeric: tabular-nums; font-weight: 800; font-size: 1.02rem; line-height: 1; color: var(--c-primary);
  background: var(--c-primary-tint); padding: 6px 12px; border-radius: var(--pill); }
.ltth .ltth-clock-ic { font-size: .95em; }
.ltth .ltth-th-clock.low { color: #fff; background: var(--c-accent); }
.ltth .ltth-progressbar { height: 6px; border-radius: var(--pill); background: var(--c-line); overflow: hidden; }
.ltth .ltth-progressbar i { display: block; height: 100%; background: var(--c-accent); border-radius: var(--pill); transition: width .25s ease; }

.ltth .ltth-exam-tools { display: flex; gap: 8px; margin-bottom: 12px; }
.ltth .ltth-tool { appearance: none; cursor: pointer; font: inherit; font-size: .84rem; font-weight: 700; min-height: 44px; padding: 7px 14px; border: var(--bw) solid var(--c-line); border-radius: var(--pill); background: var(--c-surface); color: var(--c-ink); }
.ltth .ltth-tool:hover { border-color: var(--c-primary2); }
.ltth .ltth-tool.on { border-color: var(--c-accent); background: var(--c-accent-tint); color: var(--c-accent-ink); }

.ltth .ltth-exam-nav { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 10px; margin-top: 16px; position: sticky; bottom: 0; background: var(--c-surface); padding: 10px 0; }
.ltth .ltth-exam-nav .ltth-btn, .ltth .ltth-exam-nav .ltth-cta { min-height: var(--tap); min-width: 0; white-space: normal; overflow-wrap: anywhere; }
.ltth .ltth-exam-nav .ltth-btn[disabled] { opacity: .4; cursor: not-allowed; }

/* ── 10. Lưới câu (nhảy + trạng thái) ── */
.ltth .ltth-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 8px; margin: 12px 0; }
/* 3 trạng thái phân biệt rõ: chưa làm = trắng/xám · đã trả lời = nền teal đặc · đánh dấu = chấm hồng góc (chồng được) */
.ltth .ltth-grid-btn { position: relative; appearance: none; cursor: pointer; display: flex; align-items: center; justify-content: center; font: inherit; font-weight: 800; font-size: .9rem; aspect-ratio: 1; border: var(--bw) solid var(--c-line); border-radius: 9px; background: #fff; color: var(--c-muted); transition: transform .08s; }
.ltth .ltth-grid-btn:active { transform: scale(.93); }
.ltth .ltth-grid-btn.ans { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.ltth .ltth-grid-btn.flag { border-color: var(--c-accent); }
.ltth .ltth-grid-btn.flag::after { content: ""; position: absolute; top: -4px; right: -4px; width: 11px; height: 11px; border-radius: 50%; background: var(--c-accent); border: 2px solid #fff; }
/* Câu đang làm: vòng viền INSET (không dùng outline-offset để khỏi đè ô kế bên) */
.ltth .ltth-grid-btn.cur { border-color: var(--c-ink); box-shadow: inset 0 0 0 2px var(--c-ink); color: var(--c-ink); }
.ltth .ltth-grid-btn.cur.ans { color: #fff; box-shadow: inset 0 0 0 2px #fff; }
.ltth .ltth-grid-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: .8rem; color: var(--c-muted); margin: 6px 0; align-items: center; }
.ltth .ltth-grid-legend .lg { position: relative; display: inline-block; width: 15px; height: 15px; border-radius: 4px; border: var(--bw) solid var(--c-line); background: #fff; margin-right: 6px; vertical-align: -3px; }
.ltth .ltth-grid-legend .lg.ans { background: var(--c-primary); border-color: var(--c-primary); }
.ltth .ltth-grid-legend .lg.flag { border-color: var(--c-accent); }
.ltth .ltth-grid-legend .lg.flag::after { content: ""; position: absolute; top: -4px; right: -4px; width: 9px; height: 9px; border-radius: 50%; background: var(--c-accent); border: 1.5px solid #fff; }

/* Lưới câu dạng BOTTOM-SHEET (trượt lên đè câu đang làm, không rời màn hình) */
.ltth .ltth-sheet { position: fixed; inset: 0; z-index: 50; display: flex; flex-direction: column; justify-content: flex-end; }
.ltth .ltth-sheet-backdrop { position: absolute; inset: 0; background: rgba(20,22,30,.42); opacity: 0; transition: opacity .22s ease; }
.ltth .ltth-sheet.open .ltth-sheet-backdrop { opacity: 1; }
.ltth .ltth-sheet-panel { position: relative; background: var(--c-surface); border-radius: 18px 18px 0 0; box-shadow: 0 -8px 30px rgba(20,22,30,.22); padding: 6px 16px calc(16px + env(safe-area-inset-bottom)); max-height: 82vh; display: flex; flex-direction: column; transform: translateY(100%); transition: transform .24s cubic-bezier(.22,.61,.36,1); }
.ltth .ltth-sheet.open .ltth-sheet-panel { transform: translateY(0); }
.ltth .ltth-sheet-grab { width: 40px; height: 5px; border-radius: 999px; background: var(--c-line); margin: 6px auto 2px; }
.ltth .ltth-sheet-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 2px 0 8px; }
.ltth .ltth-sheet-h { margin: 0; font-size: 1.02rem; color: var(--c-primary); }
.ltth .ltth-sheet-x { appearance: none; cursor: pointer; flex: 0 0 auto; width: 40px; height: 40px; border-radius: 50%; border: var(--bw) solid var(--c-line); background: var(--c-surface); color: var(--c-muted); font-size: 1rem; line-height: 1; }
.ltth .ltth-sheet-body { overflow-y: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain; }
.ltth .ltth-sheet-foot { padding-top: 10px; }
.ltth .ltth-sheet-foot .ltth-cta { width: 100%; }
@media (prefers-reduced-motion: reduce) { .ltth .ltth-sheet-backdrop, .ltth .ltth-sheet-panel { transition: none; } }

/* ── 11. Recommendation nudge ── */
.ltth .ltth-reco { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin: 10px 0; padding: 12px 14px; border: 1px solid #F0DDBB; border-radius: var(--r-sm); background: var(--c-warn-bg); }
.ltth .ltth-reco b { color: var(--c-primary); }

/* ── 12. Flashcards + Match ── */
.ltth .ltth-flashcard { appearance: none; cursor: pointer; display: grid; align-content: center; gap: 10px; width: 100%; min-height: 230px; padding: 24px 20px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: #fff; color: var(--c-ink); text-align: center; box-shadow: var(--shadow); }
.ltth .ltth-flashcard.flipped { background: var(--c-soft); border-color: rgba(47,93,98,.35); }
.ltth .ltth-flashcard strong { display: block; max-width: 34em; margin: 0 auto; font-size: 1.26rem; line-height: 1.35; color: var(--c-primary); overflow-wrap: anywhere; }
.ltth .ltth-flashcard em { display: block; max-width: 36em; margin: 0 auto; font-style: normal; color: var(--c-muted); line-height: 1.45; }
.ltth .ltth-card-k { display: block; font-size: .72rem; font-weight: 850; text-transform: uppercase; letter-spacing: .06em; color: var(--c-muted); }
.ltth .ltth-term-audio { display: flex; justify-content: center; margin: 0 0 10px; }
.ltth .ltth-term-audio .ltth-audio-btn { margin: 0; }
.ltth .ltth-term-related { margin: 12px 0 0; color: var(--c-muted); font-size: .86rem; }
.ltth .ltth-term-q { appearance: none; cursor: pointer; margin: 0 3px; min-width: 34px; min-height: 32px; border: var(--bw) solid var(--c-line); border-radius: 7px; background: var(--c-surface); color: var(--c-primary); font: inherit; font-weight: 800; }
.ltth .ltth-term-nav { display: grid; grid-template-columns: 1fr 1fr 1.3fr; gap: 8px; margin-top: 14px; }
.ltth .ltth-term-nav .ltth-btn, .ltth .ltth-term-nav .ltth-cta { min-height: var(--tap); }
.ltth .ltth-term-nav .ltth-btn[disabled] { opacity: .45; cursor: not-allowed; }

/* Match mobile-first: 1 thuật ngữ + 4 định nghĩa trong cùng màn, tránh kéo lên/xuống */
.ltth .ltth-match2 { margin: 2px 0 0; }
.ltth .ltth-match-dots { display: flex; justify-content: center; gap: 7px; margin: 0 0 12px; }
.ltth .ltth-match-dot { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--c-line); background: #fff; color: #fff; font-size: .75rem; font-weight: 900; }
.ltth .ltth-match-dot.done { border-color: var(--c-good); background: var(--c-good); }
.ltth .ltth-match-score { display: grid; gap: 2px; padding: 10px 12px; border-radius: var(--r-sm); background: rgba(255,255,255,.72); }
.ltth .ltth-match-score b { color: var(--c-primary); font-size: 1.55rem; line-height: 1; }
.ltth .ltth-match-score span { color: var(--c-ink); font-size: .86rem; font-weight: 800; }
.ltth .ltth-match-card { display: grid; gap: 7px; text-align: center; padding: 17px 14px; border: 1px solid rgba(47,93,98,.24); border-radius: var(--r-sm); background: var(--c-primary-tint); }
.ltth .ltth-match-card strong { color: var(--c-primary); font-size: 1.22rem; line-height: 1.28; overflow-wrap: anywhere; }
.ltth .ltth-match-card em { color: var(--c-muted); font-style: normal; font-size: .9rem; line-height: 1.35; overflow-wrap: anywhere; }
.ltth .ltth-match-defs { display: grid; gap: 8px; margin-top: 8px; }
.ltth .ltth-mdef { appearance: none; cursor: pointer; min-height: 52px; padding: 12px 14px; border: var(--bw) solid var(--c-line); border-radius: var(--r-sm); background: var(--c-surface); color: var(--c-ink); font: inherit; font-size: .92rem; font-weight: 600; line-height: 1.4; text-align: left; overflow-wrap: anywhere; transition: border-color .12s, background .12s; }
.ltth .ltth-mdef:hover { border-color: var(--c-primary2); }
.ltth .ltth-mdef.wrong { border-color: var(--c-accent); background: var(--c-accent-tint); animation: ltth-shake .32s; }
.ltth .ltth-mdef.done { border-color: #BFE7DC; background: var(--c-good-bg); color: var(--c-good-ink); cursor: default; }
@keyframes ltth-shake { 25% { transform: translateX(-4px); } 50% { transform: translateX(4px); } 75% { transform: translateX(-3px); } }
.ltth .ltth-match-feedback { min-height: 24px; margin: 10px 0; color: var(--c-accent); font-weight: 800; }
.ltth .ltth-match-actions { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 8px; margin-top: 6px; }
.ltth .ltth-match-actions .ltth-cta, .ltth .ltth-match-actions .ltth-btn { width: 100%; min-height: var(--tap); }
@media (max-width: 560px) {
  .ltth.ltth-theory { width: 100%; max-width: 100%; }
  .ltth .ltth-th-body { padding: 10px 9px 14px; }
  .ltth .ltth-head.sm { padding-left: 12px; padding-right: 12px; }
  .ltth .ltth-head.sm { grid-template-columns: 1fr; justify-items: center; gap: 8px; }
  .ltth .ltth-head-title { width: 100%; }
  .ltth .ltth-head.sm .ltth-vi-toggle { justify-self: center; }
  .ltth .ltth-learn-top { align-items: stretch; flex-direction: column; }
  .ltth .ltth-learn-top .ltth-btn { width: 100%; }
  .ltth .ltth-learn-filter { flex: 0 0 auto; min-width: 0; width: 100%; }
  .ltth .ltth-learn-round { align-items: start; flex-direction: column; }
  .ltth .ltth-learn-round span { text-align: left; }
  .ltth .ltth-study-card { padding: 12px; }
  .ltth .ltth-study-meta { flex-direction: column; gap: 3px; }
  .ltth .ltth-practice-screen { min-height: calc(100svh + 220px); }
  .ltth .ltth-q-text { font-size: 1.08rem; margin-bottom: 8px; }
  .ltth .ltth-choice { padding: 10px 11px; gap: 9px; }
  .ltth .ltth-answer-actions-loop { grid-template-columns: 1fr; }
  .ltth .ltth-learn-actions { grid-template-columns: 1fr; }
  .ltth .ltth-learn-extra-actions { grid-template-columns: 1fr; }
  .ltth .ltth-learn-pager { grid-template-columns: 1fr; text-align: center; }
  .ltth .ltth-term-nav { grid-template-columns: 1fr; }
  .ltth .ltth-match-actions { grid-template-columns: 1fr; }
  .ltth .ltth-break-row { grid-template-columns: 1fr; }
  .ltth .ltth-exam-nav { grid-template-columns: 1fr; }
  .ltth .ltth-state-fields { grid-template-columns: 1fr; }
  .ltth .ltth-state-note { grid-template-columns: 1fr; }
  .ltth .ltth-mini-link { grid-row: auto; grid-column: auto; width: 100%; margin-top: 6px; }
}

/* ── 13. Tải nội dung theo phiên (loading · error · Xem thêm) ── */
.ltth .ltth-loading { display: flex; align-items: center; justify-content: center; gap: 10px; padding: 40px 16px; color: var(--c-muted); font-weight: 700; }
.ltth .ltth-spin { width: 20px; height: 20px; border-radius: 50%; border: 3px solid var(--c-line); border-top-color: var(--c-primary); animation: ltth-spin .8s linear infinite; }
@keyframes ltth-spin { to { transform: rotate(360deg); } }
.ltth .ltth-loaderr { text-align: center; padding: 28px 16px; border: 1px solid #F0DDBB; border-radius: var(--r); background: var(--c-warn-bg); }
.ltth .ltth-loaderr p { margin: 0 0 12px; color: var(--c-ink); }
.ltth .ltth-learn-more { width: 100%; margin: 14px 0 4px; }
.ltth .ltth-empty-state { text-align: center; padding: 26px 16px; border: 1px solid var(--c-line); border-radius: var(--r); background: var(--c-soft); }
.ltth .ltth-empty-ic { width: 44px; height: 44px; margin: 0 auto 10px; display: grid; place-items: center; border-radius: 50%; background: var(--c-good-bg); color: var(--c-good); font-weight: 900; font-size: 1.3rem; }
.ltth .ltth-empty-state h4 { margin: 0 0 8px; font-size: 1.08rem; color: var(--c-ink); }
.ltth .ltth-empty-state p { max-width: 34em; margin: 0 auto 14px; color: var(--c-muted); line-height: 1.55; overflow-wrap: anywhere; }
.ltth .ltth-empty-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 12px 0 14px; }
.ltth .ltth-empty-steps span { display: grid; place-items: center; min-height: 44px; padding: 8px; border: 1px solid var(--c-line); border-radius: var(--r-sm); background: #fff; color: var(--c-primary); font-size: .82rem; font-weight: 850; line-height: 1.25; }
.ltth .ltth-empty-actions { display: grid; grid-template-columns: 1.2fr 1fr; gap: 8px; }
.ltth .ltth-empty-actions .ltth-cta, .ltth .ltth-empty-actions .ltth-btn { min-height: var(--tap); }
@media (max-width: 520px) { .ltth .ltth-empty-actions, .ltth .ltth-empty-steps { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { .ltth .ltth-spin { animation-duration: 0s; } }

/* ── 14. A11y focus + reduced-motion ── */
.ltth .ltth-modecard:focus-visible, .ltth .ltth-choice:focus-visible, .ltth .ltth-grid-btn:focus-visible,
.ltth .ltth-tool:focus-visible, .ltth .ltth-home-back:focus-visible, .ltth .ltth-flashcard:focus-visible,
.ltth .ltth-mterm:focus-visible, .ltth .ltth-mdef:focus-visible, .ltth .ltth-term-q:focus-visible,
.ltth .ltth-state-pick select:focus-visible, .ltth .ltth-state-pick input:focus-visible,
.ltth .ltth-vi-toggle:focus-visible, .ltth .ltth-learn-filter select:focus-visible,
.ltth .ltth-break-row:focus-visible, .ltth .ltth-feedback-box select:focus-visible,
.ltth .ltth-feedback-box textarea:focus-visible, .ltth .ltth-content-signal-box select:focus-visible,
.ltth .ltth-content-signal-box textarea:focus-visible { outline: 3px solid var(--focus-c); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  .ltth .ltth-progressbar i, .ltth .ltth-cta, .ltth .ltth-choice, .ltth .ltth-modecard { transition: none; }
  .ltth .ltth-mdef.wrong { animation: none; }
}