/* Phòng luyện HSK. Nhận diện lấy từ phiếu tô đáp án: mực in xanh, ô [A] tô bằng chì, lỗi đánh dấu cam. */
@font-face { font-family: 'Be Vietnam Pro'; font-weight: 400; font-display: swap; src: url('../fonts/be-vietnam-pro-vietnamese-400-normal.woff2') format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; }
@font-face { font-family: 'Be Vietnam Pro'; font-weight: 600; font-display: swap; src: url('../fonts/be-vietnam-pro-vietnamese-600-normal.woff2') format('woff2'); unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB; }
@font-face { font-family: 'Be Vietnam Pro'; font-weight: 400; font-display: swap; src: url('../fonts/be-vietnam-pro-latin-400-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Be Vietnam Pro'; font-weight: 600; font-display: swap; src: url('../fonts/be-vietnam-pro-latin-600-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

:root {
  --ink: #017114;        /* mực in của phiếu */
  --ink-d: #01540f;
  --tint: #e6f3e8;
  --rule: #b9d3be;
  --rule-soft: #dde6de;
  --lead: #1a211c;       /* chì 2B */
  --text: #0f1a12;
  --text-2: #56645a;
  --miss: #f77e2d;
  --miss-d: #a8470c;
  --miss-soft: #fff1e7;
  --bg: #f3f7f3;
  --paper: #fff;
  --zh: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', STSong, SimSun, serif;
  --num: 'Cascadia Mono', Consolas, 'SF Mono', Menlo, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 15px/1.55 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif; }
h1, h2, h3 { margin: 0; font-weight: 600; line-height: 1.3; }
h1 { font-size: 20px; }
h2 { font-size: 15px; }
h3 { font-size: 13px; }
p { margin: 0 0 8px; }
a { color: var(--ink); }
:focus-visible { outline: 2px solid var(--miss-d); outline-offset: 2px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; z-index: 50; background: #fff; padding: 8px; }
.muted { color: var(--text-2); }
.tiny { font-size: 12.5px; }
.n, .num { font-family: var(--num); font-variant-numeric: tabular-nums; }
.zh { font-family: var(--zh); }
.row { display: flex; gap: 8px; align-items: center; }
.wrap { flex-wrap: wrap; }
[hidden] { display: none !important; }

/* Khung */
#nav { position: sticky; top: 0; z-index: 20; display: flex; align-items: stretch; gap: 16px; padding: 0 max(16px, calc((100vw - 980px) / 2)); background: var(--ink); color: #fff; }
.brand { display: flex; align-items: baseline; gap: 8px; padding: 10px 0; color: #fff; text-decoration: none; white-space: nowrap; }
.brand b { font-size: 16px; }
.brand span { font-size: 12px; opacity: .85; }
.tabs { display: flex; margin-left: auto; }
.tab { display: flex; align-items: center; gap: 6px; padding: 0 12px; color: #fff; text-decoration: none; font-size: 14px; border-bottom: 3px solid transparent; }
.tab:hover { background: var(--ink-d); }
.tab.on { font-weight: 600; border-bottom-color: var(--miss); background: var(--ink-d); }
.badge { min-width: 18px; padding: 0 5px; border-radius: 9px; background: var(--miss); color: var(--text); font: 600 11px/18px var(--num); text-align: center; }
#main { outline: none; }
.page { max-width: 980px; margin: 0 auto; padding: 16px 16px 40px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.focus-mode #nav { display: none; }
.page-head { display: flex; gap: 8px; align-items: flex-start; }
.page-head p { margin: 2px 0 0; font-size: 13.5px; }
.back { display: grid; place-items: center; width: 32px; height: 32px; flex: none; color: var(--ink); }
.ico { display: inline-grid; width: 20px; height: 20px; }
.ico svg { width: 100%; height: 100%; }

/* Tờ phiếu */
.form-sheet, .card { background: var(--paper); border: 1px solid var(--rule); border-radius: 2px; padding: 14px 16px; display: block; }
.form-sheet > * + *, .card > * + * { margin-top: 8px; }
.form-sheet.flush { padding: 0; }
.form-sheet.flush > * + * { margin-top: 0; }
.sec-h { padding: 8px 12px; background: var(--tint); color: var(--ink-d); border-bottom: 1px solid var(--rule); }
.sec-foot { margin: 0; padding: 8px 12px; border-top: 1px solid var(--rule-soft); }
.card-link { display: grid; gap: 2px; color: inherit; text-decoration: none; }
.card-link:hover { border-color: var(--ink); }
.card-link > * + * { margin-top: 0; }
.empty { text-align: center; padding: 28px 16px; }
.empty .btn { margin-top: 8px; }
.disclaimer { margin-top: 4px; }
.table-wrap { overflow-x: auto; }

/* Dải vạch định vị ở mép phiếu tô */
.timing { position: relative; padding-left: 30px; }
.timing::before { content: ''; position: absolute; left: 9px; top: 12px; bottom: 12px; width: 9px; background: repeating-linear-gradient(to bottom, var(--lead) 0 5px, transparent 5px 14px); }

/* Bảng */
.grid { width: 100%; border-collapse: collapse; font-size: 14px; }
.grid th, .grid td { padding: 7px 12px; border-bottom: 1px solid var(--rule-soft); text-align: left; font-weight: 400; vertical-align: top; }
.grid thead th { color: var(--text-2); font-size: 12.5px; border-bottom: 1px solid var(--rule); }
.grid tbody th { font-weight: 600; }
.grid tbody tr:last-child > * { border-bottom: 0; }
.grid .n { text-align: right; white-space: nowrap; }
.bar { display: block; height: 8px; margin-top: 7px; background: var(--rule-soft); }
.bar i { display: block; height: 100%; background: var(--ink); }
.words-table .py, .words-table .hv { white-space: nowrap; }
.hv { color: var(--ink-d); font-weight: 600; }

/* Đầu trang tổng quan */
.exam-head h1 { font-size: 20px; }
.exam-set { display: flex; gap: 16px; align-items: center; }
.exam-set > * + * { margin-top: 0; }
.count { flex: none; display: grid; justify-items: center; padding: 6px 14px; border: 1px solid var(--ink); border-radius: 2px; }
.count b { font: 600 34px/1.1 var(--num); color: var(--ink-d); }
.count span { font-size: 11.5px; color: var(--text-2); }
.plan-form { display: grid; grid-template-columns: minmax(90px, .6fr) 2fr minmax(120px, 1fr) auto; gap: 10px; align-items: end; }
.tasks { display: grid; grid-template-columns: repeat(5, 1fr); }
.task { display: grid; gap: 2px; padding: 10px 12px; color: inherit; text-decoration: none; border-left: 1px solid var(--rule-soft); }
.task:first-child { border-left: 0; }
.task:hover { background: var(--tint); }
.task-n { font: 600 26px/1.15 var(--num); color: var(--ink-d); }
.task-l { font-size: 13px; }
.task-l small { display: block; color: var(--miss-d); font-size: 11.5px; }
.task-none .task-n { color: var(--rule); }

/* Ô tô: chi tiết nhận diện chính */
.mark { display: inline-flex; align-items: center; justify-content: center; flex: none; min-width: 34px; height: 22px; color: var(--ink); font: 400 13px/1 var(--num); }
.mark::before { content: '['; }
.mark::after { content: ']'; }
.mark.is-on { background: var(--lead); color: var(--lead); }
.mark.is-right { background: var(--ink); color: #fff; }
.mark.is-wrong { background: var(--miss); color: var(--text); }
.mark.is-on::before, .mark.is-on::after, .mark.is-right::before, .mark.is-right::after, .mark.is-wrong::before, .mark.is-wrong::after { color: transparent; }

.omr-group { display: grid; grid-template-columns: 130px 1fr; gap: 10px; padding-top: 8px; border-top: 1px solid var(--rule-soft); }
.omr-group h3 small { display: block; font: 400 12px var(--num); color: var(--text-2); }
.omr { display: flex; flex-wrap: wrap; gap: 3px; align-content: flex-start; }
.omr i, .legend i { display: inline-block; width: 13px; height: 16px; border: 1px solid var(--ink); border-top-width: 2px; border-bottom-width: 2px; border-left-width: 2px; border-right-width: 2px; border-top-color: var(--ink); clip-path: polygon(0 0, 35% 0, 35% 2px, 2px 2px, 2px calc(100% - 2px), 35% calc(100% - 2px), 35% 100%, 0 100%, 0 0, 100% 0, 100% 100%, 65% 100%, 65% calc(100% - 2px), calc(100% - 2px) calc(100% - 2px), calc(100% - 2px) 2px, 65% 2px, 65% 0); }
.omr i.omr-right, .legend i.omr-right { background: var(--lead); border-color: var(--lead); clip-path: none; }
.omr i.omr-wrong, .legend i.omr-wrong { background: var(--miss); border-color: var(--miss); clip-path: none; }
.omr i.omr-held, .legend i.omr-held { border-color: var(--rule); }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; color: var(--text-2); }
.legend span { display: inline-flex; align-items: center; gap: 5px; }

/* Danh sách dạng */
.type-row { display: grid; grid-template-columns: 1fr 76px 64px; gap: 10px; align-items: center; padding: 10px 12px; border-bottom: 1px solid var(--rule-soft); color: inherit; text-decoration: none; }
.type-row:last-child { border-bottom: 0; }
.type-row:hover { background: var(--tint); }
.type-name { display: grid; }
.type-row .num { text-align: right; font-size: 15px; }
.type-row small { display: block; font: 400 11px 'Be Vietnam Pro', sans-serif; color: var(--text-2); }

/* Câu hỏi */
.stage { display: grid; gap: 12px; }
.q-head { display: flex; justify-content: space-between; align-items: baseline; }
.q-num { font: 600 13px var(--num); color: var(--ink-d); }
.q-num-big { font-size: 15px; }
.zh-body { font-size: 19px; line-height: 1.85; }
.zh-q { font-size: 18px; line-height: 1.7; font-weight: 600; }
.zh-word { font-size: 22px; }
.blank { display: inline-block; min-width: 2.4em; padding: 0 4px; margin: 0 2px; border-bottom: 2px solid var(--ink); color: var(--ink); text-align: center; font-family: var(--num); font-size: .8em; }
.blank-on { background: var(--marker, #ffdf7e); border-bottom-color: var(--lead); color: var(--text); font-weight: 600; }
.options { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 4px; }
.option { width: 100%; display: flex; gap: 10px; align-items: flex-start; padding: 7px 8px; background: none; border: 1px solid transparent; border-radius: 2px; text-align: left; color: inherit; font: inherit; cursor: pointer; }
.option .zh { font-size: 18px; line-height: 1.5; }
.options-long .option .zh { font-size: 16.5px; }
.option:not(:disabled):hover { background: var(--tint); border-color: var(--rule); }
.option:disabled { cursor: default; color: inherit; }
.option.is-on { border-color: var(--lead); }
.option.is-on .mark { background: var(--lead); color: var(--lead); }
.option.is-on .mark::before, .option.is-on .mark::after, .option.is-right .mark::before, .option.is-right .mark::after, .option.is-wrong .mark::before, .option.is-wrong .mark::after { color: transparent; }
.option.is-right { background: var(--tint); border-color: var(--ink); }
.option.is-right .mark { background: var(--ink); color: #fff; }
.option.is-wrong { background: var(--miss-soft); border-color: var(--miss); }
.option.is-wrong .mark { background: var(--miss); color: var(--text); }
.listen { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; padding: 10px 12px; background: var(--tint); }
.script { width: 100%; padding: 8px 12px; border-left: 3px solid var(--rule); }
.script p { margin: 0 0 4px; font-size: 17px; line-height: 1.7; }
.who { display: inline-block; margin-right: 6px; color: var(--text-2); font-size: .85em; }
.scene { padding: 8px 12px; background: var(--tint); }
.scene small { color: var(--text-2); }

/* Giải thích */
.explain { margin-top: 12px; padding-top: 10px; border-top: 2px solid var(--rule); display: grid; gap: 8px; }
.explain p { margin: 0; }
.verdict { font-weight: 600; color: var(--ink-d); }
.explain-no .verdict { color: var(--miss-d); }
.trans { color: var(--text-2); }
.why { list-style: none; margin: 0; padding: 0; display: grid; gap: 3px; font-size: 14px; }
.why li { display: flex; gap: 8px; }
.why-l { flex: none; width: 16px; font-family: var(--num); color: var(--text-2); }
.why-right { font-weight: 600; }
.why-chosen { color: var(--miss-d); }
.trap-note { padding: 8px 12px; background: var(--miss-soft); border-left: 3px solid var(--miss); font-size: 14px; }
.trap-line { font-size: 14.5px; }
.words-here summary { cursor: pointer; font-size: 13.5px; color: var(--ink-d); }
.word-rows { list-style: none; margin: 6px 0 0; padding: 0; display: grid; gap: 3px; font-size: 14px; }
.word-rows li { display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; }
.say { background: none; border: 0; padding: 0; color: var(--ink-d); font-size: 17px; cursor: pointer; }
.py { color: var(--text-2); }
.py-line { color: var(--text-2); font-size: 14px; }
.explain-tools { display: flex; gap: 16px; }
.link-btn { background: none; border: 0; padding: 0; color: var(--ink); font: inherit; font-size: 13px; text-decoration: underline; cursor: pointer; }
.btn-next { margin-top: 12px; }

/* Nút */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 8px 16px; border: 1px solid transparent; border-radius: 2px; font: 600 14px 'Be Vietnam Pro', sans-serif; text-decoration: none; cursor: pointer; }
.btn:disabled { opacity: .5; cursor: default; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:not(:disabled):hover { background: var(--ink-d); }
.btn-ghost { background: #fff; border-color: var(--ink); color: var(--ink); }
.btn-ghost:not(:disabled):hover { background: var(--tint); }
.btn-danger { background: #fff; border-color: #c62828; color: #c62828; }
.btn-orange, .btn-listen { background: var(--miss); color: var(--text); }
.btn-full { width: 100%; }
.btn-sm { min-height: 32px; padding: 4px 10px; font-size: 13px; }

/* Thẻ từ */
.flash { display: grid; gap: 10px; }
.flash > * + * { margin-top: 0; }
.flash-word { justify-self: center; padding: 16px 12px; background: none; border: 0; color: var(--text); font-size: 54px; line-height: 1.2; cursor: pointer; }
.flash-back { display: grid; gap: 4px; text-align: center; }
.flash-back p { margin: 0; }
.py-big { font-size: 18px; color: var(--text-2); }
.hv-big { font-size: 18px; font-weight: 600; color: var(--ink-d); }
.hv-big small { font-weight: 400; color: var(--text-2); font-size: 12px; }
.vi-big { font-size: 16px; }
.flash-back .trap-note { text-align: left; margin-top: 8px; }
.rate { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 12px; }
.rate-btn { display: grid; gap: 1px; justify-items: center; padding: 8px 2px; background: #fff; border: 1px solid var(--rule); border-radius: 2px; font: inherit; cursor: pointer; }
.rate-btn small { font-family: var(--num); font-size: 11px; color: var(--text-2); }
.rate-btn:hover { background: var(--tint); }
.r-again { border-color: var(--miss); color: var(--miss-d); }
.r-good { border-color: var(--ink); color: var(--ink-d); }
.stat-line { font-size: 15px; }
.num-big { font: 600 22px var(--num); color: var(--ink-d); }
.filter input, .filter select, .plan-form select, .field input, textarea { font: inherit; padding: 8px 10px; background: #fff; border: 1px solid var(--rule); border-radius: 2px; color: inherit; }
.filter input { flex: 1 1 240px; }
textarea { width: 100%; }
textarea.zh { font-size: 18px; line-height: 1.7; }
select { max-width: 100%; }

/* Phòng thi */
.run-head { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px; padding: 8px max(16px, calc((100vw - 1100px) / 2)); background: var(--lead); color: #fff; }
.run-title { font-size: 14px; font-weight: 600; margin-right: auto; }
.clock { font: 600 22px var(--num); letter-spacing: .03em; }
.clock-low { color: var(--miss); }
.run-body { max-width: 1100px; margin: 0 auto; padding: 12px 16px 40px; display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 12px; align-items: start; }
.run-q > * + * { margin-top: 10px; }
.run-nav { justify-content: space-between; margin-top: 14px; }
.ok-count { color: var(--ink-d); font-weight: 600; }
.answer-sheet { position: sticky; top: 60px; max-height: calc(100vh - 72px); overflow-y: auto; background: var(--paper); border: 1px solid var(--ink); border-radius: 2px; padding: 8px 10px; }
.answer-sheet h2 { font-size: 12.5px; color: var(--ink-d); padding-bottom: 6px; border-bottom: 1px solid var(--rule); }
.sheet-rows { display: grid; }
.sheet-row { display: flex; align-items: center; gap: 0; width: 100%; padding: 1px 2px; background: none; border: 0; border-bottom: 1px solid var(--rule-soft); font: inherit; cursor: pointer; }
.sheet-row .n { width: 24px; flex: none; text-align: right; margin-right: 4px; font-size: 12px; color: var(--ink-d); }
.sheet-row .mark { min-width: 30px; height: 18px; font-size: 11.5px; margin-right: 2px; }
.sheet-row:hover { background: var(--tint); }
.sheet-row-now { background: var(--marker, #ffdf7e); }
.sheet-row-done .tiny { font-weight: 600; color: var(--lead); }

/* Xem lại đề */
.rev { border-bottom: 1px solid var(--rule-soft); }
.rev:last-child { border-bottom: 0; }
.rev summary { display: flex; gap: 8px; align-items: center; padding: 6px 12px; cursor: pointer; list-style: none; }
.rev summary::-webkit-details-marker { display: none; }
.rev summary .n { width: 26px; flex: none; text-align: right; font-size: 13px; color: var(--ink-d); }
.rev-text { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rev-body { padding: 8px 12px 14px; }
.only-wrong .rev[data-ok="1"] { display: none; }
.write-rev { padding: 10px 0; border-top: 1px solid var(--rule-soft); }
.write-rev p { margin-bottom: 6px; }
.your { padding: 8px 10px; background: var(--bg); font-size: 17px; white-space: pre-wrap; }
.sample { font-size: 16px; }
.sample small { font-family: 'Be Vietnam Pro', sans-serif; color: var(--text-2); }
.self { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 13.5px; }

/* Biểu mẫu tài khoản */
.auth { max-width: 460px; }
.auth-form { display: grid; gap: 10px; }
.field { display: grid; gap: 4px; }
.field > span:first-child { font-size: 13.5px; font-weight: 600; }
.field input, .field select, .plan-form select { width: 100%; }
.field-hint { font-weight: 400; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; }
.check input { margin-top: 4px; }
.form-err { margin: 0; color: #c62828; font-size: 14px; }
.form-err:empty { display: none; }
.form-ok, .ok-line { color: var(--ink-d); }
.auth-links { font-size: 14px; }
.set-row { display: flex; justify-content: space-between; gap: 12px; }
.sync-row { align-items: center; }
.book-group summary { cursor: pointer; font-size: 14px; padding: 4px 0; }
.account-actions { margin-top: 8px; }
.account-keep { margin-top: 8px; }
.plain-list { margin: 0; padding-left: 18px; display: grid; gap: 4px; }
.notice { margin: 0; padding: 8px 12px; background: var(--miss-soft); border-left: 3px solid var(--miss); font-size: 14px; }
.eyebrow { font-size: 12px; color: var(--miss-d); font-weight: 600; }
.steps-list { margin: 0; padding-left: 20px; display: grid; gap: 4px; }
.install { display: grid; gap: 12px; }
.note-pen { font-size: 14px; }

/* Hộp thoại, thông báo */
.sheet-wrap { position: fixed; inset: 0; z-index: 40; display: grid; place-items: center; padding: 16px; background: rgba(15, 26, 18, .5); }
.sheet { position: relative; width: min(480px, 100%); max-height: 90vh; overflow-y: auto; padding: 18px; background: #fff; border-top: 4px solid var(--ink); outline: none; }
.sheet-x { position: absolute; top: 6px; right: 6px; display: grid; place-items: center; width: 36px; height: 36px; background: none; border: 0; cursor: pointer; }
.sheet-body > div > * + * { margin-top: 10px; }
.sheet-body h2 { font-size: 17px; padding-right: 28px; }
.toast { position: fixed; left: 50%; bottom: 76px; z-index: 60; transform: translateX(-50%); padding: 9px 14px; background: var(--lead); color: #fff; font-size: 14px; border-radius: 2px; transition: opacity .3s; }
.toast.out { opacity: 0; }

/* Điện thoại */
.vi-opt { font-size: 15.5px; }
@media (max-width: 760px) {
  .hide-m { display: none; }
  body { padding-bottom: 60px; }
  .focus-mode { padding-bottom: 0; }
  #nav { position: static; padding: 0 16px; }
  .tabs { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; margin: 0; background: var(--ink); padding-bottom: env(safe-area-inset-bottom); }
  .tab { flex: 1; justify-content: center; gap: 3px; padding: 11px 0; font-size: 12px; border-bottom: 0; border-top: 3px solid transparent; text-align: center; }
  .tab.on { border-top-color: var(--miss); }
  .focus-mode .tabs { display: none; }
  .tasks { grid-template-columns: repeat(2, 1fr); }
  .task { border-left: 0; border-bottom: 1px solid var(--rule-soft); }
  .task:nth-child(even) { border-left: 1px solid var(--rule-soft); }
  .plan-form { grid-template-columns: 1fr; }
  .omr-group { grid-template-columns: 1fr; gap: 4px; }
  .run-body { grid-template-columns: 1fr; padding: 8px; }
  .answer-sheet { position: static; max-height: none; }
  .sheet-rows { grid-template-columns: repeat(auto-fill, minmax(164px, 1fr)); column-gap: 8px; }
  .run-head { padding: 6px 10px; gap: 8px; }
  .run-title { font-size: 12.5px; }
  .clock { font-size: 18px; }
  .flash-word { font-size: 46px; }
  .words-table .py { white-space: normal; }
}
@media (prefers-reduced-motion: reduce) { .toast { transition: none; } }

/* Khóa học theo bài */
.py-under { display: block; margin: 0; color: var(--text-2); font-size: 13.5px; line-height: 1.45; }
.q-vi { font-weight: 600; font-size: 15px; }
.opt-stack { display: grid; gap: 1px; }
.pic-opt { font-size: 34px; line-height: 1.2; }
.lesson-row { display: grid; grid-template-columns: 34px 1fr auto; gap: 10px; align-items: center; padding: 10px 12px; border-bottom: 1px solid var(--rule-soft); color: inherit; text-decoration: none; }
.lesson-row:last-child { border-bottom: 0; }
.lesson-row:hover { background: var(--tint); }
.lesson-n { font: 600 15px var(--num); color: var(--ink-d); text-align: center; }
.lesson-row b { display: block; }
.lesson-meta { font-size: 12.5px; color: var(--text-2); }
.lesson-score { font: 400 13px var(--num); text-align: right; white-space: nowrap; color: var(--text-2); }
.lesson-done .lesson-n { background: var(--lead); color: #fff; }
.goal { margin: 0; padding-left: 18px; }
.talk-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; }
.talk-line { display: grid; grid-template-columns: 62px 1fr; gap: 2px 8px; padding: 6px 0; border-top: 1px solid var(--rule-soft); }
.talk-who { color: var(--text-2); font-size: 12.5px; padding-top: 5px; }
.talk-z { background: none; border: 0; padding: 0; font: inherit; font-family: var(--zh); font-size: 19px; line-height: 1.5; color: var(--text); text-align: left; cursor: pointer; }
.talk-z:hover { color: var(--ink-d); }
.talk-line .py-under, .talk-vi { grid-column: 2; }
.talk-vi { color: var(--text-2); font-size: 14px; }
.hide-py .py-under { display: none; }
.hide-vi .talk-vi { display: none; }
.g-card { padding: 12px 0; border-top: 1px solid var(--rule-soft); }
.g-card:first-of-type { border-top: 0; }
.g-card h3 { font-size: 15px; }
.g-pattern { margin: 4px 0; padding: 4px 8px; background: var(--tint); font-family: var(--zh); font-size: 16px; }
.g-trap { padding: 6px 10px; background: var(--miss-soft); border-left: 3px solid var(--miss); font-size: 14px; margin: 6px 0; }
.g-ex { list-style: none; margin: 6px 0 0; padding: 0; display: grid; gap: 6px; }
.g-ex .zh { font-size: 17px; }
.g-ex .ex-word { display: block; font-size: 13px; font-weight: 600; color: var(--text-2); }
.ex-section .g-ex { gap: 12px; }
.ex-section .say { text-align: left; }
.hv-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 14.5px; }
.lesson-nav { justify-content: space-between; }
.sound-row { display: flex; flex-wrap: wrap; gap: 6px; }
.sound-btn { display: grid; gap: 0; justify-items: center; min-width: 58px; padding: 6px 8px; background: #fff; border: 1px solid var(--rule); border-radius: 2px; font: inherit; cursor: pointer; }
.sound-btn:hover { background: var(--tint); }
.sound-btn b { font-size: 16px; }
.sound-btn small { color: var(--text-2); font-size: 11.5px; }
.grid .zh { font-size: 17px; }
.course-note { font-size: 13px; color: var(--text-2); }
@media (max-width: 760px) {
  .tab { font-size: 11px; line-height: 1.2; }
  .talk-line { grid-template-columns: 1fr; }
  .talk-line .py-under, .talk-vi { grid-column: 1; }
  .talk-who { padding-top: 0; }
}

@media (min-width: 761px) {
  .word-rows li { display: grid; grid-template-columns: 96px 130px 170px 1fr; gap: 8px; align-items: baseline; }
}

/* Tập viết */
.word-rows.with-write li { position: relative; }
.write-btn { background: #fff; border: 1px solid var(--ink); border-radius: 2px; color: var(--ink); font: 600 12.5px 'Be Vietnam Pro', sans-serif; padding: 3px 9px; cursor: pointer; }
.write-btn:hover { background: var(--tint); }
.write-btn-flash { justify-self: center; margin-top: 8px; padding: 6px 12px; }
.write-cta { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; margin-top: 12px; padding: 10px 12px; background: var(--tint); }
.write-cta p { margin: 0; font-size: 14px; }
.char-panel { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px 20px; align-items: start; }
.char-actions { margin-top: 8px; }
.write-msg { min-height: 22px; margin: 6px 0 0; font-size: 13.5px; color: var(--ink-d); max-width: 280px; }
.stroke-box { position: relative; background: #fff; touch-action: none; }
.stroke-under, .stroke-target { position: absolute; inset: 0; }
.stroke-target svg { display: block; }
.tian-box { fill: none; stroke: var(--ink); stroke-width: 12; }
.tian-guide { stroke: var(--rule); stroke-width: 5; stroke-dasharray: 26 22; }
.char-title { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; margin: 0 0 4px; }
.char-title .zh { font-size: 34px; line-height: 1.1; font-weight: 400; }
.rule-line { padding: 6px 10px; background: var(--tint); font-size: 14px; }
.char-right h3 { margin-top: 10px; }
.frames { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0; padding: 0; }
.frames li { display: grid; justify-items: center; gap: 1px; width: 66px; }
.frame { display: block; width: 66px; height: 66px; background: #fff; }
.frame-n { font: 400 11px var(--num); color: var(--text-2); }
.st-done { fill: var(--lead); }
.st-now { fill: var(--miss); }
.st-todo { fill: #dde6de; }
.st-start { fill: var(--ink); stroke: #fff; stroke-width: 10; }
.char-chips { display: flex; flex-wrap: wrap; gap: 4px; }
.chip-char { min-width: 38px; height: 38px; background: #fff; border: 1px solid var(--rule); border-radius: 2px; font-size: 19px; cursor: pointer; color: var(--text); }
.chip-char:hover { background: var(--tint); }
.chip-char.done { border-color: var(--ink); color: var(--ink-d); background: var(--tint); }
.chip-char.on { background: var(--lead); border-color: var(--lead); color: #fff; }
.sheet-wide { width: min(760px, 100%); }
.stroke-types { list-style: none; margin: 6px 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 6px 14px; font-size: 14px; }
.stroke-types li { display: flex; gap: 8px; align-items: baseline; }
.stroke-glyph { flex: none; align-self: flex-start; width: 26px; height: 26px; }
.stroke-glyph path { fill: none; stroke: var(--lead); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.rule-card { padding: 10px 0; border-top: 1px solid var(--rule-soft); }
.rule-card p { margin: 0 0 4px; }
details.form-sheet summary { cursor: pointer; font-weight: 600; font-size: 14px; }
@media (min-width: 761px) {
  .word-rows.with-write li { grid-template-columns: 96px 130px 170px 1fr auto; }
}
@media (max-width: 760px) {
  .char-panel { grid-template-columns: 1fr; }
  .char-left { justify-items: center; }
  .stroke-box { margin: 0 auto; }
  .char-actions { justify-content: center; }
  .write-msg { max-width: none; text-align: center; }
  .frames li, .frame { width: 56px; }
  .frame { height: 56px; }
  .word-rows.with-write .write-btn { margin-left: auto; }
}

/* Chọn cấp */
.level-tabs { display: flex; flex-wrap: wrap; gap: 4px; }
.level-tab { padding: 6px 12px; background: #fff; border: 1px solid var(--rule); border-radius: 2px; color: var(--ink-d); text-decoration: none; font: 600 13.5px 'Be Vietnam Pro', sans-serif; }
.level-tab:hover { background: var(--tint); }
.level-tab.on { background: var(--ink); border-color: var(--ink); color: #fff; }
.level-tab.off { color: var(--rule); background: transparent; border-style: dashed; cursor: default; }