:root {
  --bg: var(--tg-theme-bg-color, #ffffff);
  --text: var(--tg-theme-text-color, #16181d);
  --hint: var(--tg-theme-hint-color, #6b7280);
  --link: var(--tg-theme-link-color, #1d4ed8);
  --btn: var(--tg-theme-button-color, #1d4ed8);
  --btn-text: var(--tg-theme-button-text-color, #ffffff);
  --card: var(--tg-theme-secondary-bg-color, #f2f4f7);
  --line: color-mix(in srgb, var(--text) 12%, transparent);
  --ok: #15803d;
  --ok-bg: color-mix(in srgb, #16a34a 14%, var(--bg));
  --bad: #b91c1c;
  --bad-bg: color-mix(in srgb, #dc2626 12%, var(--bg));
  --warn-bg: color-mix(in srgb, #f59e0b 16%, var(--bg));
  --radius: 14px;
  /* Luôn ưu tiên font Unicode, không để máy dùng font Zawgyi cài sẵn */
  --font-my: "Noto Sans Myanmar", "Padauk", "Pyidaungsu", "Myanmar Text", sans-serif;
  --font-ko: system-ui, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font-family: var(--font-my);
  font-size: 16px;
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
  overflow-wrap: anywhere;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--link); }

.ko, [lang="ko"] { font-family: var(--font-ko); line-height: 1.6; }
.hint { color: var(--hint); font-size: 14px; }
.small { font-size: 13px; }
.center { text-align: center; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.stack > * + * { margin-top: 12px; }

#app { max-width: 640px; margin: 0 auto; padding: 12px 14px 96px; }
.loading { padding: 48px 0; text-align: center; color: var(--hint); }
.offline {
  position: sticky; top: 0; z-index: 10; padding: 6px 12px; text-align: center; font-size: 14px;
  background: var(--warn-bg); border-bottom: 1px solid var(--line);
}

.topbar { display: flex; align-items: center; gap: 8px; margin: 0 0 10px; min-height: 36px; }
.topbar h1 { font-size: 18px; margin: 0; line-height: 1.5; }
.backlink { background: none; border: 0; padding: 4px 6px 4px 0; color: var(--link); font-size: 15px; flex: none; white-space: nowrap; }

.hero { padding: 6px 0 10px; }
.hero-title { font-size: 20px; font-weight: 700; line-height: 1.5; }
.hero-sub { color: var(--hint); font-size: 14px; }

.card {
  background: var(--card); border-radius: var(--radius); padding: 14px; border: 0; width: 100%;
  text-align: left; display: block; margin: 0 0 12px;
}
button.card:active { opacity: .8; }
.card-title { font-weight: 700; font-size: 16px; line-height: 1.6; }
.card-alert { background: var(--warn-bg); font-weight: 700; }
.plan-card { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.badge {
  display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 99px;
  background: color-mix(in srgb, var(--btn) 15%, transparent); color: var(--link); line-height: 1.7;
}
.badge-ok { background: var(--ok-bg); color: var(--ok); }
.badge-bad { background: var(--bad-bg); color: var(--bad); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
.tile {
  background: var(--card); border: 0; border-radius: var(--radius); padding: 14px 12px; text-align: left;
  min-height: 108px; display: flex; flex-direction: column; gap: 2px;
}
.tile-icon { font-size: 26px; line-height: 1.2; }
.tile-title { font-weight: 700; line-height: 1.6; }
.tile-sub { color: var(--hint); font-size: 13px; line-height: 1.6; }

.btn {
  border: 0; border-radius: 12px; padding: 11px 16px; background: var(--card); color: var(--text);
  font-weight: 700; line-height: 1.5; min-height: 46px;
}
.btn-primary { background: var(--btn); color: var(--btn-text); }
.btn-block { display: block; width: 100%; }
.btn-small { min-height: 34px; padding: 4px 12px; font-size: 14px; font-weight: 600; }
.btn:disabled { opacity: .5; }

.tabs { display: flex; gap: 6px; margin-bottom: 12px; overflow-x: auto; }
.tab { flex: 1; border: 0; background: var(--card); border-radius: 10px; padding: 8px 10px; font-size: 14px; white-space: nowrap; }
.tab.active { background: var(--btn); color: var(--btn-text); font-weight: 700; }

.list-item { display: flex; align-items: center; gap: 12px; }
.list-num {
  flex: none; width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--btn) 14%, transparent); color: var(--link); font-weight: 700;
}

/* Bài học */
.lesson-head .ko { font-size: 22px; font-weight: 700; }
.audio-box { background: var(--card); border-radius: var(--radius); padding: 10px; margin: 10px 0; }
.audio-box audio { width: 100%; }
.speed { display: flex; gap: 6px; margin-top: 6px; align-items: center; }
.speed button { border: 0; border-radius: 8px; background: var(--bg); padding: 2px 10px; font-size: 14px; }
.speed button.active { background: var(--btn); color: var(--btn-text); }
.section { margin: 18px 0; }
.section h3 { font-size: 15px; margin: 0 0 8px; color: var(--hint); font-weight: 700; }
.line { padding: 8px 0; border-bottom: 1px solid var(--line); }
.line .ko { font-size: 18px; }
.line .my { color: var(--hint); font-size: 15px; }
.speaker {
  display: inline-block; min-width: 26px; text-align: center; margin-right: 6px; border-radius: 6px;
  background: var(--card); font-size: 13px; font-family: var(--font-ko);
}
.hide-my .my { display: none; }
.vocab { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.vocab-item { background: var(--card); border-radius: 10px; padding: 8px 10px; white-space: pre-line; }
.vocab-item .ko { font-size: 17px; font-weight: 600; }
.vocab-item .my { font-size: 14px; color: var(--hint); }
.grammar { background: var(--card); border-radius: 10px; padding: 10px 12px; }
.grammar .pattern { font-size: 18px; font-weight: 700; }
.tts { border: 0; background: none; padding: 0 4px; font-size: 15px; }
.source { margin-top: 24px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 12px; color: var(--hint); }

/* Thi */
.exam-bar {
  position: sticky; top: 0; z-index: 5; background: var(--bg); padding: 6px 0 8px; margin-bottom: 6px;
  border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 10px;
}
.timer { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 18px; font-family: var(--font-ko); }
.timer.low { color: var(--bad); }
.q-prompt { font-size: 16px; font-weight: 600; }
.q-prompt-my { color: var(--hint); font-size: 14px; }
.q-image { font-size: 84px; text-align: center; line-height: 1.3; margin: 8px 0; }
.q-image img { max-width: 100%; max-height: 240px; border-radius: 10px; }
.q-passage {
  white-space: pre-line; background: var(--card); border-radius: 10px; padding: 12px; margin: 10px 0; font-size: 17px;
}
.options { display: grid; gap: 8px; margin: 12px 0; }
.options-img { grid-template-columns: 1fr 1fr; }
.opt {
  display: flex; gap: 10px; align-items: center; text-align: left; width: 100%;
  border: 2px solid var(--line); background: var(--bg); border-radius: 12px; padding: 10px 12px; min-height: 52px;
}
.options-img .opt { justify-content: center; min-height: 96px; }
.opt-n { flex: none; font-size: 18px; color: var(--hint); font-family: var(--font-ko); }
.opt-text { font-size: 17px; }
.opt-img { font-size: 52px; line-height: 1.2; }
.opt-img img { max-width: 100%; max-height: 110px; }
.opt.chosen { border-color: var(--btn); background: color-mix(in srgb, var(--btn) 10%, var(--bg)); }
.opt.is-correct { border-color: var(--ok); background: var(--ok-bg); }
.opt.is-wrong { border-color: var(--bad); background: var(--bad-bg); }
/* Ô số câu: tối thiểu 44×44 px cho dễ bấm (khung 375 px → 7 ô một hàng) */
.qnav { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 6px; margin: 14px 0; }
.qnav button {
  border: 1px solid var(--line); background: var(--bg); border-radius: 8px; padding: 0; font-size: 15px;
  min-height: 44px; min-width: 44px; font-family: var(--font-ko);
}
.qnav button.done { background: color-mix(in srgb, var(--btn) 18%, var(--bg)); }
.qnav button.current { outline: 2px solid var(--btn); }
.play-btn { width: 100%; }

/* Kết quả */
.score-big { font-size: 46px; font-weight: 800; text-align: center; line-height: 1.2; font-family: var(--font-ko); }
.score-sub { display: flex; gap: 10px; justify-content: center; margin: 8px 0 14px; }
.review-item { border-left: 4px solid var(--bad); }
.review-item.ok { border-left-color: var(--ok); }
.answer-line { font-size: 14px; }
.expl { background: var(--bg); border-radius: 10px; padding: 8px 10px; margin-top: 8px; font-size: 15px; }
.transcript { white-space: pre-line; font-size: 14px; color: var(--hint); }

/* Thanh toán */
.price { font-size: 22px; font-weight: 800; font-family: var(--font-ko); }
.features { margin: 6px 0 10px; padding-left: 20px; font-size: 14px; }
.copy-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.copy-row .val { font-size: 19px; font-weight: 800; font-family: var(--font-ko); letter-spacing: .5px; }
.steps { padding-left: 20px; margin: 8px 0; }
.field { display: block; margin-bottom: 12px; }
.field span { display: block; font-size: 14px; color: var(--hint); }
.field input, .field textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--bg);
}
.field-error { color: var(--bad); font-size: 13px; }
.notice { background: var(--warn-bg); border-radius: 10px; padding: 10px 12px; font-size: 14px; margin: 10px 0; }
.footer { margin-top: 18px; font-size: 12px; color: var(--hint); }
.footer p { margin: 6px 0; }

/* Nhiều file nghe trong một bài + bản dịch tạm tiếng Anh */
.tracks { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.track { border: 1px solid var(--line); background: var(--bg); border-radius: 99px; padding: 2px 10px; font-size: 13px; }
.track.active { background: var(--btn); color: var(--btn-text); border-color: var(--btn); }
.en { font-family: system-ui, sans-serif; font-size: 14px; color: var(--hint); }
.en-tag {
  display: inline-block; font-size: 10px; font-weight: 700; padding: 0 5px; margin-right: 6px; border-radius: 4px;
  background: color-mix(in srgb, var(--hint) 20%, transparent); vertical-align: 1px;
}
.expl { margin: 4px 0 6px; font-size: 15px; }
.para { white-space: pre-line; margin-top: 8px; }
.hide-my .expl { display: none; }

/* Báo lỗi dịch: nút cờ, dấu "?" câu chưa chắc, ghi chú bản dịch AI, form dạng tấm trượt */
.tr-tools { display: inline-flex; gap: 2px; margin-left: 6px; vertical-align: 1px; }
.tr-flag, .tr-uncertain {
  border: 0; background: none; padding: 0 4px; font-size: 13px; line-height: 1.4; color: var(--hint); opacity: .7;
}
.tr-uncertain {
  font-weight: 700; color: var(--warn, #b45309); border: 1px solid currentColor; border-radius: 99px; padding: 0 6px; font-size: 11px;
}
.ai-note { color: var(--hint); margin: 8px 0 0; }
.sheet-wrap { position: fixed; inset: 0; z-index: 50; background: rgba(0, 0, 0, .35); display: flex; align-items: flex-end; }
.sheet {
  background: var(--bg); width: 100%; max-width: 640px; margin: 0 auto; border-radius: 16px 16px 0 0; padding: 16px 16px 24px;
  max-height: 90vh; overflow-y: auto;
}
.sheet textarea { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; background: var(--bg); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 10px; }
.chip { border: 1px solid var(--line); background: var(--bg); border-radius: 99px; padding: 4px 12px; font-size: 14px; }
.chip.active { background: var(--btn); color: var(--btn-text); border-color: var(--btn); }

.ko.extra { white-space: pre-line; font-size: 15px; color: var(--hint); margin-top: 4px; }

/* Góp ý khách hàng (01/11/2026): thẻ mời làm đề / mua gói, hỏi lần đầu, chế độ như thi thật, điểm theo dạng, bảng so sánh gói */
.card-cta { background: color-mix(in srgb, var(--btn) 14%, var(--card)); }
.chips-lg .chip { min-height: 44px; padding: 6px 14px; font-size: 15px; }
.check { display: flex; gap: 10px; align-items: flex-start; margin: 10px 0 14px; font-size: 15px; }
.check input { width: 22px; height: 22px; flex: none; margin-top: 4px; }
.link-like { background: none; border: 0; padding: 0; color: var(--link); text-decoration: underline; font: inherit; text-align: left; }
.skill-row { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; align-items: center; margin: 8px 0; font-size: 15px; }
.skill-num { font-family: var(--font-ko); font-weight: 700; }
.bar { grid-column: 1 / -1; height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--btn); border-radius: 99px; }
.compare { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 6px; table-layout: fixed; }
.compare th, .compare td { padding: 8px 4px; border-bottom: 1px solid var(--line); text-align: center; vertical-align: middle; line-height: 1.6; }
.compare th:first-child, .compare td:first-child { text-align: left; width: 52%; }
.compare th { font-size: 13px; }
.compare .col-hi { background: color-mix(in srgb, var(--btn) 10%, transparent); font-weight: 700; }
button.list-item:disabled { opacity: .5; }

/* Bài tập EPS-TOPIK của giáo trình (cuối mỗi bài) */
.bt { margin-top: 26px; padding-top: 12px; border-top: 2px solid var(--line); }
.bt-title { font-size: 18px; margin: 0 0 4px; line-height: 1.5; }
.bt h3 { margin-top: 16px; }
.bt-q { border-left: 4px solid transparent; }
.bt-q.ok { border-left-color: var(--ok); }
.bt-q.bad { border-left-color: var(--bad); }
.bt-q .my { color: var(--hint); font-size: 14px; }
.bt-img { font-size: 0; line-height: 0; }
.bt-img img { display: block; max-height: none; width: 100%; height: auto; background: #fff; }
.options-n { grid-template-columns: repeat(4, 1fr); }
.options-n .opt { justify-content: center; min-height: 48px; }
.options-n .opt-n { font-size: 22px; color: inherit; }
.bt-script { margin-top: 8px; }
.bt-script .line .ko { font-size: 16px; }

/* Mã QR tài khoản nhận tiền */
.qr-box { text-align: center; margin: 8px 0 4px; }
.qr-img { border: 0; background: #fff; padding: 8px; border-radius: 12px; display: inline-block; }
.qr-img img { display: block; width: 200px; max-width: 70vw; height: auto; }
.qr-zoom {
  position: fixed; inset: 0; z-index: 60; background: rgba(0, 0, 0, .85); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 12px; padding: 16px; color: #fff;
}
.qr-zoom img { width: min(92vw, 520px); height: auto; background: #fff; border-radius: 12px; padding: 10px; }
.copy-row .val-sm { font-size: 15px; font-weight: 600; }
select { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--bg); }
.copy-row .val-long { font-size: 16px; letter-spacing: 0; }
.copy-row .btn { flex: none; }

/* Giữ chân người học: chuỗi ngày + vòng mục tiêu, trang mua chọn gói, bảng xếp hạng */
.streak-card { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.streak-num { font-size: 26px; font-weight: 800; line-height: 1.3; font-family: var(--font-ko); }
.streak-goal { display: flex; flex-direction: column; align-items: center; gap: 2px; text-align: center; max-width: 50%; }
.ring-bg { fill: none; stroke: var(--line); stroke-width: 6; }
.ring-fg { fill: none; stroke: var(--ok); stroke-width: 6; stroke-linecap: round; }
.plan-opt { border: 2px solid transparent; }
.plan-opt.selected { border-color: var(--btn); background: color-mix(in srgb, var(--btn) 10%, var(--card)); }
.plan-opt.best:not(.selected) { border-color: color-mix(in srgb, var(--btn) 40%, transparent); }
.plan-opt .radio { color: var(--link); font-size: 18px; }
.badge-save { background: var(--warn-bg); color: #92400e; font-weight: 700; }
.card-dim { opacity: .75; }
.lb { padding: 6px 10px; }
.lb-row { display: flex; align-items: center; gap: 10px; padding: 8px 4px; border-bottom: 1px solid var(--line); }
.lb-row:last-child { border-bottom: 0; }
.lb-row.me { background: color-mix(in srgb, var(--btn) 10%, transparent); border-radius: 8px; font-weight: 700; }
.lb-rank { width: 30px; text-align: center; font-family: var(--font-ko); }
.lb-score { font-family: var(--font-ko); font-weight: 700; }

/* Điểm sàn theo ngành (thang 100, HRD Korea) */
.floors .floor-row { display: flex; align-items: center; gap: 8px; padding: 6px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.floor-num { font-family: var(--font-ko); font-weight: 700; }
.floor-bar { position: relative; height: 12px; border-radius: 99px; background: var(--line); margin: 22px 0 10px; }
.floor-fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 99px; background: var(--btn); }
.floor-mark { position: absolute; top: -6px; bottom: -6px; width: 2px; background: var(--text); }
.floor-mark i { position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%); white-space: nowrap; font-style: normal; font-size: 11px; line-height: 1.2; font-family: var(--font-ko); color: var(--hint); }
.expl-locked { display: block; width: 100%; text-align: left; text-decoration: none; color: var(--hint); background: var(--card); }