/* Trình Giải Toán — giao diện thân thiện cho học sinh. Mọi kiểu đều nằm trong .tgt để không ảnh hưởng theme. */

.tgt {
	--tgt-font: "Nunito", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	--tgt-ink: #23314d;
	--tgt-muted: #5d6b86;
	--tgt-bg: #f6f8ff;
	--tgt-card: #ffffff;
	--tgt-line: #e3e8f4;
	--tgt-primary: #ff7a45;
	--tgt-primary-dark: #e85d27;
	--tgt-blue: #3d7bfd;
	--tgt-green: #22b07d;
	--tgt-pink: #f0508f;
	--tgt-purple: #8b5cf6;
	--tgt-red: #ef4444;
	--tgt-teal: #12a4b6;
	--tgt-orange: #ff9f1c;
	--tgt-ok: #16a34a;
	--tgt-ok-bg: #e8f8ee;
	--tgt-bad: #dc2626;
	--tgt-bad-bg: #fdecec;
	--tgt-warn-bg: #fff6e0;
	--tgt-radius: 18px;
	--tgt-shadow: 0 6px 20px rgba(35, 49, 77, .08);
	--tgt-grid: #e6e9f2;
	--tgt-axis: #55607a;
	--tgt-canvas: #ffffff;
	font-family: var(--tgt-font);
	color: var(--tgt-ink);
	line-height: 1.55;
	box-sizing: border-box;
	max-width: 1100px;
	margin-left: auto;
	margin-right: auto;
}
.tgt *, .tgt *::before, .tgt *::after { box-sizing: inherit; }
.tgt [hidden] { display: none !important; }
.tgt button { font-family: inherit; }
.tgt .tgt-sr { position: absolute; opacity: 0; width: 1px; height: 1px; pointer-events: none; }

/* ---------- Hero ---------- */
.tgt-hero {
	display: flex; align-items: center; gap: 18px;
	background: linear-gradient(135deg, #fff1e8 0%, #eaf1ff 55%, #f1ebff 100%);
	border-radius: 24px; padding: 22px 24px; margin-bottom: 22px;
}
.tgt-hero__mascot {
	font-size: 56px; line-height: 1; flex: none;
	animation: tgt-bob 3s ease-in-out infinite;
}
@keyframes tgt-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
.tgt-hero__title { font-size: clamp(1.3rem, 3.4vw, 1.9rem); font-weight: 800; margin: 0 0 4px; color: var(--tgt-ink); }
.tgt-hero__sub { margin: 0; color: var(--tgt-muted); font-size: 1.02rem; }

/* ---------- Chọn lớp ---------- */
.tgt-grades { display: grid; gap: 14px; margin-bottom: 18px; }
.tgt-grades__group { background: var(--tgt-card); border-radius: var(--tgt-radius); padding: 14px 16px; box-shadow: var(--tgt-shadow); }
.tgt-grades__label { font-weight: 800; font-size: .95rem; text-transform: uppercase; letter-spacing: .04em; color: var(--tgt-muted); margin-bottom: 10px; }
.tgt-grades__row { display: flex; flex-wrap: wrap; gap: 10px; }
.tgt-grade-btn {
	--c: var(--tgt-green);
	display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
	min-width: 76px; height: 76px; padding: 6px 10px;
	border: 3px solid transparent; border-radius: 20px; cursor: pointer;
	background: color-mix(in srgb, var(--c) 14%, #fff); color: var(--tgt-ink);
	transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.tgt-level-thcs .tgt-grade-btn { --c: var(--tgt-blue); }
.tgt-level-thpt .tgt-grade-btn { --c: var(--tgt-purple); }
.tgt-grade-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 18px color-mix(in srgb, var(--c) 30%, transparent); }
.tgt-grade-btn:focus-visible { outline: 3px solid var(--c); outline-offset: 3px; }
.tgt-grade-btn.is-active { background: var(--c); color: #fff; border-color: color-mix(in srgb, var(--c) 70%, #000); transform: translateY(-3px) scale(1.04); }
.tgt-grade-btn__small { font-size: .78rem; font-weight: 700; opacity: .85; }
.tgt-grade-btn__num { font-size: 1.9rem; font-weight: 900; line-height: 1; }

.tgt-hint { text-align: center; font-size: 1.1rem; color: var(--tgt-muted); font-weight: 700; padding: 18px; }

/* ---------- Thẻ công cụ ---------- */
.tgt-section-title { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: 1.35rem; font-weight: 800; margin: 26px 0 14px; color: var(--tgt-ink); }
.tgt-badge { background: var(--tgt-primary); color: #fff; font-size: .85rem; padding: 3px 12px; border-radius: 999px; }
.tgt-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; }
.tgt-card {
	--c: var(--tgt-blue);
	display: flex; flex-direction: column; align-items: flex-start; gap: 4px; text-align: left;
	background: var(--tgt-card); border: 2px solid var(--tgt-line); border-top: 6px solid var(--c);
	border-radius: var(--tgt-radius); padding: 14px 16px; cursor: pointer; color: var(--tgt-ink);
	box-shadow: var(--tgt-shadow); transition: transform .15s ease, border-color .15s ease;
}
.tgt-card:hover { transform: translateY(-3px); border-color: var(--c); }
.tgt-card:focus-visible { outline: 3px solid var(--c); outline-offset: 2px; }
.tgt-card.is-active { background: color-mix(in srgb, var(--c) 10%, #fff); border-color: var(--c); }
.tgt-card__icon { font-size: 2rem; line-height: 1.1; }
.tgt-card__name { font-weight: 800; font-size: 1.05rem; }
.tgt-card__desc { font-size: .9rem; color: var(--tgt-muted); }
.tgt-color-orange { --c: var(--tgt-orange); }
.tgt-color-green { --c: var(--tgt-green); }
.tgt-color-pink { --c: var(--tgt-pink); }
.tgt-color-purple { --c: var(--tgt-purple); }
.tgt-color-blue { --c: var(--tgt-blue); }
.tgt-color-red { --c: var(--tgt-red); }
.tgt-color-teal { --c: var(--tgt-teal); }

/* ---------- Khung công cụ ---------- */
.tgt-tool-stage { position: relative; margin-top: 18px; scroll-margin-top: 80px; }
.tgt-stage__close {
	position: absolute; top: 12px; right: 12px; z-index: 2; width: 40px; height: 40px; border-radius: 50%;
	border: 0; background: #eef1f8; color: var(--tgt-ink); font-size: 1.1rem; cursor: pointer;
}
.tgt-stage__close:hover { background: #e1e6f2; }
.tgt-tool { background: var(--tgt-card); border-radius: 22px; padding: 20px; box-shadow: var(--tgt-shadow); border: 2px solid var(--tgt-line); }
.tgt-tool__head { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 14px; padding-right: 44px; }
.tgt-tool__icon { font-size: 2.4rem; line-height: 1; }
.tgt-tool__title { margin: 0 0 4px; font-size: 1.35rem; font-weight: 800; color: var(--tgt-ink); }
.tgt-tool__intro { margin: 0; color: var(--tgt-muted); }

.tgt-form__fields { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.tgt-form__fields--inner { display: contents; }
.tgt-field { display: flex; flex-direction: column; gap: 4px; flex: 1 1 160px; min-width: 0; }
.tgt-field--wide { flex: 1 1 100%; }
.tgt-field__label { font-weight: 700; font-size: .92rem; color: var(--tgt-muted); }
.tgt-field--swatch .tgt-field__label::before { content: ""; display: inline-block; width: 12px; height: 12px; border-radius: 50%; background: var(--tgt-swatch); margin-right: 6px; vertical-align: -1px; }
.tgt .tgt-input {
	width: 100%; font: inherit; font-size: 1.1rem; color: var(--tgt-ink);
	padding: 11px 14px; border: 2px solid var(--tgt-line); border-radius: 14px; background: #fbfcff;
	transition: border-color .15s ease, box-shadow .15s ease; min-height: 48px;
}
.tgt .tgt-input:focus { outline: none; border-color: var(--tgt-blue); box-shadow: 0 0 0 4px color-mix(in srgb, var(--tgt-blue) 18%, transparent); background: #fff; }
.tgt-form__actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }

.tgt-btn {
	display: inline-flex; align-items: center; justify-content: center; gap: 6px;
	font-weight: 800; font-size: 1.02rem; line-height: 1.2; padding: 12px 22px; min-height: 48px;
	border-radius: 999px; border: 2px solid transparent; cursor: pointer; text-decoration: none;
	transition: transform .1s ease, background .15s ease;
}
.tgt-btn:active { transform: scale(.97); }
.tgt-btn--primary { background: var(--tgt-primary); color: #fff; box-shadow: 0 5px 0 var(--tgt-primary-dark); }
.tgt-btn--primary:hover { background: var(--tgt-primary-dark); }
.tgt-btn--ghost { background: #eef1f8; color: var(--tgt-ink); }
.tgt-btn--ghost:hover { background: #e1e6f2; }
.tgt-btn--big { font-size: 1.15rem; padding: 14px 28px; }
.tgt-btn:focus-visible { outline: 3px solid var(--tgt-blue); outline-offset: 3px; }

.tgt-examples { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 14px; }
.tgt-examples__label { font-weight: 700; color: var(--tgt-muted); font-size: .92rem; }
.tgt-chip { border: 2px dashed var(--tgt-line); background: #fff; color: var(--tgt-ink); border-radius: 999px; padding: 6px 14px; font-weight: 700; font-size: .92rem; cursor: pointer; }
.tgt-chip:hover { border-color: var(--tgt-primary); color: var(--tgt-primary-dark); }

/* ---------- Kết quả ---------- */
.tgt-result:empty { display: none; }
.tgt-result { margin-top: 18px; display: grid; gap: 14px; }
.tgt-alert { background: var(--tgt-warn-bg); border: 2px solid #ffd98a; border-radius: 14px; padding: 12px 16px; font-weight: 600; }
.tgt-answer { background: linear-gradient(135deg, #e9fbf2, #eef5ff); border: 2px solid #b9ebd3; border-radius: 16px; padding: 14px 18px; }
.tgt-answer__label { font-weight: 800; color: var(--tgt-ok); margin-bottom: 4px; }
.tgt-answer__value { font-size: 1.2rem; overflow-x: auto; }
.tgt-steps-wrap { background: #fbfcff; border: 2px solid var(--tgt-line); border-radius: 16px; padding: 10px 16px; }
.tgt-steps-wrap summary, .tgt-solution summary { cursor: pointer; font-weight: 800; padding: 4px 0; }
/* Số thứ tự tự vẽ: marker mặc định bị cắt khi li có overflow (công thức dài cuộn ngang) */
.tgt .tgt-steps { margin: 8px 0 4px; padding: 0; list-style: none; counter-reset: tgt-step; }
.tgt .tgt-steps li { position: relative; margin: 10px 0; padding: 1px 0 1px 2.3em; min-height: 1.7em; overflow-x: auto; overflow-y: hidden; counter-increment: tgt-step; }
.tgt .tgt-steps li::before {
	content: counter(tgt-step); position: absolute; left: 0; top: 0;
	width: 1.7em; height: 1.7em; border-radius: 50%; display: grid; place-items: center;
	background: color-mix(in srgb, var(--tgt-primary) 16%, #fff); color: var(--tgt-primary-dark); font-weight: 900; font-size: .85em;
}

/* Đặt tính theo cột */
.tgt-column { display: inline-grid; justify-self: start; font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; font-size: 1.5rem; font-weight: 700; background: #fffdf5; border: 2px solid #f5e6b8; border-radius: 14px; padding: 12px 18px; }
.tgt-row { display: flex; }
.tgt-cell { width: 1.1em; text-align: center; }
.tgt-row--line { border-bottom: 3px solid var(--tgt-ink); }
.tgt-row--result { color: var(--tgt-primary-dark); }
.tgt-column--div { grid-template-columns: auto auto; column-gap: 0; }
.tgt-div__left { padding-right: 12px; }
.tgt-div__right { border-left: 3px solid var(--tgt-ink); padding-left: 12px; }
.tgt-div__divisor { border-bottom: 3px solid var(--tgt-ink); }
.tgt-div__quot { color: var(--tgt-primary-dark); }
.tgt-div__rem { grid-column: 1 / -1; font-size: 1rem; color: var(--tgt-muted); margin-top: 6px; }

.tgt-table-wrap { overflow-x: auto; }
.tgt-table { border-collapse: collapse; background: #fff; }
.tgt-table th, .tgt-table td { border: 1px solid var(--tgt-line); padding: 6px 12px; text-align: center; }
.tgt-table th { background: #f2f5fc; }

/* Đồ thị */
.tgt-graph { position: relative; margin-top: 14px; }
.tgt-graph__canvas { display: block; width: 100%; height: 380px; border-radius: 16px; border: 2px solid var(--tgt-line); touch-action: none; cursor: grab; background: var(--tgt-canvas); }
.tgt-graph__canvas:active { cursor: grabbing; }
.tgt-graph__controls { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.tgt-graph__controls .tgt-btn { padding: 8px 14px; min-height: 40px; font-size: .95rem; }
.tgt-graph__inputs { display: grid; gap: 10px; }
.tgt-graph__info { margin-top: 12px; display: grid; gap: 6px; font-size: .97rem; }
.tgt-graph__line { display: flex; gap: 8px; align-items: baseline; }
.tgt-dot { width: 12px; height: 12px; border-radius: 50%; flex: none; display: inline-block; }

/* ---------- Bộ đề: thẻ ---------- */
.tgt-sets { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.tgt-set-card {
	display: flex; flex-direction: column; gap: 6px; padding: 16px 18px; border-radius: var(--tgt-radius);
	background: var(--tgt-card); border: 2px solid var(--tgt-line); box-shadow: var(--tgt-shadow);
	color: var(--tgt-ink); text-decoration: none !important; transition: transform .15s ease, border-color .15s ease;
}
.tgt-set-card:hover { transform: translateY(-3px); border-color: var(--tgt-primary); }
.tgt-set-card__grade { align-self: flex-start; background: #eef4ff; color: var(--tgt-blue); font-weight: 800; font-size: .8rem; padding: 2px 10px; border-radius: 999px; }
.tgt-set-card__title { font-weight: 800; font-size: 1.07rem; }
.tgt-set-card__meta { display: flex; flex-wrap: wrap; gap: 4px 12px; color: var(--tgt-muted); font-size: .88rem; }
.tgt-set-card__go { margin-top: auto; font-weight: 800; color: var(--tgt-primary-dark); }
.tgt-empty { color: var(--tgt-muted); font-weight: 700; grid-column: 1 / -1; }

/* ---------- Làm bài ---------- */
.tgt-quiz { margin: 24px auto; }
.tgt-quiz__title { font-size: 1.4rem; font-weight: 800; }
.tgt-quiz__intro { display: flex; gap: 18px; align-items: center; background: linear-gradient(135deg, #fff1e8, #eef4ff); border-radius: 22px; padding: 22px; }
.tgt-quiz__badge { font-size: 3rem; }
.tgt-quiz__meta { margin: 0 0 6px; font-weight: 700; color: var(--tgt-muted); }
.tgt-quiz__best { margin: 0 0 12px; font-weight: 800; color: var(--tgt-primary-dark); }
.tgt-quiz__top {
	position: sticky; top: 0; z-index: 5; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px;
	background: rgba(255, 255, 255, .96); padding: 10px 4px; border-bottom: 2px solid var(--tgt-line); margin-bottom: 12px;
}
.admin-bar .tgt-quiz__top { top: 32px; }
.tgt-quiz__counter { font-weight: 800; }
.tgt-quiz__clock { font-weight: 800; background: #eef4ff; padding: 2px 12px; border-radius: 999px; }
.tgt-quiz__clock.is-low { background: var(--tgt-bad-bg); color: var(--tgt-bad); }
.tgt-progress { flex: 1 1 100%; height: 10px; background: #eef1f8; border-radius: 999px; overflow: hidden; }
.tgt-progress__fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--tgt-green), var(--tgt-blue)); transition: width .3s ease; }

.tgt-questions { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.tgt-q { background: var(--tgt-card); border: 2px solid var(--tgt-line); border-radius: 20px; padding: 16px 18px; box-shadow: var(--tgt-shadow); }
.tgt-q.is-correct { border-color: #9be3bd; }
.tgt-q.is-wrong { border-color: #f6b4b4; }
.tgt-q.is-partial { border-color: #ffd98a; }
.tgt-q__head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 8px; }
.tgt-q__num { background: var(--tgt-primary); color: #fff; font-weight: 800; padding: 2px 12px; border-radius: 999px; }
.tgt-q__type { color: var(--tgt-muted); font-weight: 700; font-size: .88rem; }
.tgt-q__mark { margin-left: auto; font-weight: 800; }
.tgt-q__text { font-size: 1.08rem; margin-bottom: 10px; overflow-x: auto; }
.tgt-q__text img { max-width: 100%; height: auto; }

.tgt-options { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.tgt-option {
	position: relative; display: flex; align-items: center; gap: 10px; padding: 10px 14px; min-height: 52px;
	border: 2px solid var(--tgt-line); border-radius: 14px; cursor: pointer; background: #fbfcff; transition: border-color .15s ease, background .15s ease;
}
.tgt-option:hover { border-color: var(--tgt-blue); }
.tgt-option__letter { flex: none; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; font-weight: 900; background: #eef1f8; }
.tgt-option:has(input:checked) { border-color: var(--tgt-blue); background: #eef4ff; }
.tgt-option:has(input:checked) .tgt-option__letter { background: var(--tgt-blue); color: #fff; }
.tgt-option:has(input:focus-visible) { outline: 3px solid var(--tgt-blue); outline-offset: 2px; }
.tgt-option.is-correct { border-color: var(--tgt-ok); background: var(--tgt-ok-bg); }
.tgt-option.is-correct .tgt-option__letter { background: var(--tgt-ok); color: #fff; }
.tgt-option.is-wrong { border-color: var(--tgt-bad); background: var(--tgt-bad-bg); }
.tgt-option.is-wrong .tgt-option__letter { background: var(--tgt-bad); color: #fff; }

.tgt-tf { display: grid; gap: 8px; }
.tgt-tf__row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; padding: 8px 12px; border: 2px solid var(--tgt-line); border-radius: 14px; background: #fbfcff; }
.tgt-tf__row.is-correct { border-color: var(--tgt-ok); background: var(--tgt-ok-bg); }
.tgt-tf__row.is-wrong { border-color: var(--tgt-bad); background: var(--tgt-bad-bg); }
.tgt-tf__text { flex: 1 1 260px; }
.tgt-tf__btns { display: flex; gap: 8px; }
.tgt-tf__btn { position: relative; cursor: pointer; }
.tgt-tf__btn span { display: inline-block; padding: 8px 16px; border-radius: 999px; border: 2px solid var(--tgt-line); font-weight: 800; background: #fff; min-width: 70px; text-align: center; }
.tgt-tf__btn--true input:checked + span { background: var(--tgt-ok); border-color: var(--tgt-ok); color: #fff; }
.tgt-tf__btn--false input:checked + span { background: var(--tgt-bad); border-color: var(--tgt-bad); color: #fff; }
.tgt-tf__btn input:focus-visible + span { outline: 3px solid var(--tgt-blue); outline-offset: 2px; }
.tgt-tf__key { flex-basis: 100%; font-weight: 700; font-size: .9rem; color: var(--tgt-muted); }

.tgt-short { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.tgt .tgt-input--short { max-width: 280px; }
.tgt-short__key { font-weight: 800; color: var(--tgt-ok); }

.tgt-solution { margin-top: 12px; background: #fffaf0; border: 2px dashed #f4d58d; border-radius: 14px; padding: 8px 14px; }
.tgt-solution > div { padding: 6px 0; overflow-x: auto; }

.tgt-quiz__actions { display: flex; justify-content: center; gap: 12px; margin: 22px 0 8px; }
.tgt-score { display: flex; align-items: center; gap: 18px; background: var(--tgt-bad-bg); border: 2px solid #f6b4b4; border-radius: 22px; padding: 18px 22px; margin-bottom: 16px; }
.tgt-score.is-pass { background: var(--tgt-ok-bg); border-color: #9be3bd; }
.tgt-score__emoji { font-size: 3.4rem; line-height: 1; }
.tgt-score__value { font-size: 2rem; font-weight: 900; }
.tgt-score__text { font-weight: 700; margin-bottom: 10px; }

.tgt-error { color: var(--tgt-bad); }

/* ---------- Matrix & Scientific Lab ---------- */
.tgt-form__fields.tgt-lab { display: block; }
.tgt-lab .tgt-lab-modsel { display: none; }
.tgt-lab-tabs { display: flex; gap: 8px; overflow-x: auto; padding: 2px 2px 10px; margin-bottom: 6px; scrollbar-width: thin; }
.tgt-lab-tab {
	flex: none; display: inline-flex; align-items: center; gap: 6px; border: 2px solid var(--tgt-line); background: #fff; color: var(--tgt-ink);
	border-radius: 999px; padding: 8px 14px; font-weight: 800; font-size: .95rem; cursor: pointer; white-space: nowrap;
}
.tgt-lab-tab:hover { border-color: var(--tgt-teal); }
.tgt-lab-tab:focus-visible { outline: 3px solid var(--tgt-teal); outline-offset: 2px; }
.tgt-lab-tab.is-active { background: var(--tgt-teal); border-color: var(--tgt-teal); color: #fff; }
.tgt-lab-panel { display: grid; gap: 12px; }
.tgt-lab-fields { margin: 0; }
.tgt-lab-fields > .tgt-field:not(.tgt-field--wide), .tgt-lab-slot > .tgt-field { flex: 0 1 240px; }
.tgt-lab-sub { display: grid; gap: 12px; }
.tgt-lab-slot { display: contents; }
.tgt-lab-swap { align-self: flex-end; min-height: 46px; padding: 8px 14px; font-size: 1.2rem; }
.tgt-lab-hint { margin: 0; color: var(--tgt-muted); font-size: .9rem; }
.tgt-lab-hint code { background: #eef1f8; border-radius: 6px; padding: 1px 6px; font-size: .88em; }
.tgt-lab-examples { margin-top: 12px; }

.tgt-lab-grids { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: flex-start; }
.tgt-lab-gridwrap { display: grid; gap: 6px; max-width: 100%; }
.tgt-lab-gridscroll { overflow-x: auto; max-width: 100%; padding: 2px; }
.tgt-lab-grid { border-collapse: separate; border-spacing: 6px; border-left: 3px solid var(--tgt-ink); border-right: 3px solid var(--tgt-ink); border-radius: 10px; margin: 0; }
.tgt .tgt-lab-grid { width: auto; table-layout: auto; background: none; }
.tgt .tgt-lab-grid th, .tgt .tgt-lab-grid td { border: 0; background: none; vertical-align: middle; }
.tgt .tgt-lab-grid th { font-weight: 800; color: var(--tgt-muted); font-size: .9rem; padding: 0 2px; text-align: center; }
.tgt .tgt-lab-grid td { padding: 0; }
.tgt .tgt-lab-grid--aug .is-split { border-left: 2px dashed var(--tgt-muted); padding-left: 8px; }
.tgt .tgt-lab-cell {
	width: 64px; height: 42px; padding: 4px 6px; text-align: center; font: inherit; font-weight: 700; font-size: 1rem; color: var(--tgt-ink);
	border: 2px solid var(--tgt-line); border-radius: 10px; background: #fbfcff;
}
.tgt .tgt-lab-cell:focus { outline: none; border-color: var(--tgt-teal); box-shadow: 0 0 0 3px color-mix(in srgb, var(--tgt-teal) 20%, transparent); background: #fff; }
.tgt .tgt-lab-cell::placeholder { color: #b8c0d4; }

.tgt .tgt-lab-expr { font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; font-size: 1.15rem; }
.tgt-lab-keypad { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; max-width: 560px; }
.tgt-lab-key {
	min-height: 44px; border: 0; border-radius: 10px; background: #eef1f8; color: var(--tgt-ink); font-weight: 800; font-size: .98rem;
	cursor: pointer; box-shadow: 0 3px 0 #d6dceb; padding: 4px 2px;
}
.tgt-lab-key:active { transform: translateY(2px); box-shadow: 0 1px 0 #d6dceb; }
.tgt-lab-key:focus-visible { outline: 3px solid var(--tgt-blue); outline-offset: 2px; }
.tgt-lab-key.is-digit { background: #fff; border: 2px solid var(--tgt-line); font-size: 1.1rem; }
.tgt-lab-key.is-danger { background: #fdecec; color: var(--tgt-bad); box-shadow: 0 3px 0 #f3c9c9; }
.tgt-lab-key.is-run { background: var(--tgt-primary); color: #fff; box-shadow: 0 3px 0 var(--tgt-primary-dark); font-size: 1.2rem; }
.tgt-lab-key.is-wide { grid-column: span 2; }

.tgt-lab-extra { display: grid; gap: 12px; }
.tgt-lab-figure { margin: 0; background: #fff; border: 2px solid var(--tgt-line); border-radius: 16px; padding: 10px; }
.tgt-lab-figure figcaption { font-size: .88rem; color: var(--tgt-muted); margin-top: 4px; }
.tgt-lab-chart { display: block; width: 100%; height: auto; }
.tgt-lab-chart__grid { stroke: var(--tgt-grid); stroke-width: 1; }
.tgt-lab-chart__tick { fill: var(--tgt-muted); font-size: 12px; font-family: var(--tgt-font); }
.tgt-lab-chart__line { fill: none; stroke: var(--tgt-primary); stroke-width: 3; stroke-linejoin: round; }
.tgt-lab-chart__dot { fill: var(--tgt-blue); stroke: #fff; stroke-width: 2; }
.tgt-lab-chart__pred { fill: var(--tgt-green); stroke: #fff; stroke-width: 2; }
.tgt-lab-chart__box { fill: color-mix(in srgb, var(--tgt-teal) 18%, #fff); stroke: var(--tgt-teal); stroke-width: 2.5; }
.tgt-lab-chart__whisker { stroke: var(--tgt-axis); stroke-width: 2.5; }
.tgt-lab-chart__median { stroke: var(--tgt-primary-dark); stroke-width: 4; }
.tgt-lab-dot--data { background: var(--tgt-blue); }
.tgt-lab-dot--pred { background: var(--tgt-green); }
.tgt-lab-key-line { display: inline-block; width: 22px; height: 3px; border-radius: 2px; background: var(--tgt-primary); vertical-align: middle; }

/* ---------- Điện thoại ---------- */
@media (max-width: 600px) {
	.tgt-hero { padding: 16px; gap: 12px; }
	.tgt-hero__mascot { font-size: 42px; }
	.tgt-grades__group { padding: 12px; }
	.tgt-grades__row { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 8px; }
	.tgt-grade-btn { min-width: 0; height: 66px; }
	.tgt-grade-btn__num { font-size: 1.6rem; }
	.tgt-cards { grid-template-columns: 1fr 1fr; gap: 10px; }
	.tgt-card { padding: 12px; }
	.tgt-card__desc { display: none; }
	.tgt-tool { padding: 16px 14px; border-radius: 18px; }
	.tgt-tool__icon { font-size: 2rem; }
	.tgt-field { flex-basis: 100%; }
	.tgt-form__actions .tgt-btn--primary { flex: 1; }
	.tgt-column { font-size: 1.25rem; }
	.tgt-graph__canvas { height: 300px; }
	.tgt-quiz__intro { flex-direction: column; text-align: center; }
	.tgt-score { flex-direction: column; text-align: center; }
	.tgt-q { padding: 14px; }
	.admin-bar .tgt-quiz__top { top: 0; }
	.tgt .tgt-lab-cell { width: 52px; height: 40px; font-size: .95rem; }
	.tgt-lab-grid { border-spacing: 4px; }
	.tgt-lab-keypad { gap: 5px; }
	.tgt-lab-key { min-height: 42px; font-size: .9rem; }
	.tgt-lab-swap { flex: 1 1 100%; }
}

/* Theme tối: giữ nền sáng cho khu vực học tập để chữ luôn dễ đọc */
@media (prefers-color-scheme: dark) {
	.tgt-hub, .tgt-quiz, .tgt-tool-standalone { color-scheme: light; }
}

/* Tiêu đề trong plugin dùng font của plugin, không lấy font tiêu đề của theme */
.tgt h2, .tgt h3, .tgt h4 { font-family: var(--tgt-font); letter-spacing: normal; line-height: 1.25; }

/* ---------- Chủ đề trên thẻ bộ đề và trong bài làm ---------- */
.tgt-set-card__topics { display: flex; flex-wrap: wrap; gap: 4px; }
.tgt-cd-tag { font-size: .74rem; font-weight: 800; padding: 2px 8px; border-radius: 999px; background: color-mix(in srgb, var(--cd, #3d7bfd) 13%, var(--tgt-card)); color: var(--tgt-ink); white-space: nowrap; }
.tgt-cd-tag.tgt-cd--orange { --cd: #ff7a45; }
.tgt-cd-tag.tgt-cd--blue { --cd: #3d7bfd; }
.tgt-cd-tag.tgt-cd--green { --cd: #16a36f; }
.tgt-cd-tag.tgt-cd--pink { --cd: #e63e82; }
.tgt-cd-tag.tgt-cd--purple { --cd: #8b5cf6; }
.tgt-cd-tag.tgt-cd--teal { --cd: #0f97a8; }
.tgt-cd-tag.tgt-cd--red { --cd: #e5484d; }
.tgt-q__topics { margin: 8px 0 0; font-size: .86rem; color: var(--tgt-muted); }
.tgt-q__topics a { color: var(--tgt-blue); font-weight: 700; }
.tgt-quiz__levels { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 12px; }
.tgt-quiz__levels .tgt-chip.is-active { border-style: solid; border-color: var(--tgt-primary); background: var(--tgt-primary); color: #fff; }