/* Loopa — giao diện theo GUI2 (nền sáng xanh nhạt, nút chính xanh dương, thẻ bo tròn). Hỗ trợ sáng / tối / tự động. */
:root{
  --fs:1;
  --bg:#f3f7ff; --surface:#ffffff; --surface-2:#eaf1ff; --text:#0f1b33; --text-soft:#55637d; --line:#d9e4f7;
  --primary:#2563eb; --primary-d:#1d4ed8; --primary-soft:#dbe8ff; --accent:#f97316;
  --ok:#16a34a; --ok-soft:#dcfce7; --warn:#d97706; --warn-soft:#fef3c7; --bad:#dc2626; --bad-soft:#fee2e2;
  --shadow:0 2px 12px rgba(30,64,175,.08); --radius:16px;
  --font:"Be Vietnam Pro","Segoe UI",system-ui,-apple-system,"Noto Sans","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --font-cjk:"Noto Sans CJK SC","PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  /* tên cũ dùng bởi các tệp CSS khác */
  --paper:var(--surface); --paper-deep:var(--surface-2); --ink:var(--text); --ink-soft:var(--text-soft); --seal:var(--primary); --seal-deep:var(--primary-d); --jade:var(--ok); --gold:var(--accent);
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0b1220; --surface:#121b2e; --surface-2:#1a2640; --text:#e8eefc; --text-soft:#9fb0d0; --line:#26344f;
  --primary:#4f8cff; --primary-d:#3b78ee; --primary-soft:#1d2f55; --ok:#4ade80; --ok-soft:#12301f; --warn:#fbbf24; --warn-soft:#3a2d0b; --bad:#f87171; --bad-soft:#3b1717;
  --shadow:0 2px 14px rgba(0,0,0,.45); color-scheme:dark;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]):not([data-theme="dark"]){
    --bg:#0b1220; --surface:#121b2e; --surface-2:#1a2640; --text:#e8eefc; --text-soft:#9fb0d0; --line:#26344f;
    --primary:#4f8cff; --primary-d:#3b78ee; --primary-soft:#1d2f55; --ok:#4ade80; --ok-soft:#12301f; --warn:#fbbf24; --warn-soft:#3a2d0b; --bad:#f87171; --bad-soft:#3b1717;
    --shadow:0 2px 14px rgba(0,0,0,.45); color-scheme:dark;
  }
}

*{box-sizing:border-box;}
html{font-size:calc(16px * var(--fs));}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.45;padding-bottom:calc(76px + env(safe-area-inset-bottom));}
button,input,select{font-family:inherit;color:inherit;}
[hidden]{display:none!important;}
h1,h2,h3,p{margin:0;}
body.booting > *:not(.toast){visibility:hidden;}

/* ---------- Thanh trên + điều hướng ---------- */
.appbar{position:sticky;top:0;z-index:30;background:var(--surface);border-bottom:1px solid var(--line);}
.appbar-in{max-width:1280px;margin:0 auto;padding:10px max(16px,env(safe-area-inset-right)) 10px max(16px,env(safe-area-inset-left));display:flex;align-items:center;gap:14px;}
.brand{display:flex;align-items:center;gap:10px;}
.logo{width:34px;height:34px;border-radius:50%;border:5px solid var(--primary);border-top-color:var(--accent);flex:0 0 auto;}
.brand-name{font-weight:800;font-size:1.35rem;color:var(--primary);letter-spacing:-.01em;}
.brand-tag{display:block;font-size:.72rem;color:var(--text-soft);line-height:1.1;}
.topnav{display:none;margin-left:auto;gap:4px;}
.streak{margin-left:auto;display:flex;align-items:center;gap:6px;background:var(--warn-soft);color:var(--warn);border-radius:999px;padding:4px 12px;font-weight:700;font-size:.9rem;}
.tab{border:none;background:transparent;cursor:pointer;color:var(--text-soft);display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 8px;border-radius:12px;font-size:.7rem;font-weight:600;flex:1;min-height:52px;}
.tab-icon{font-size:1.25rem;line-height:1;}
.tab.active{color:var(--primary);background:var(--primary-soft);}
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:40;background:var(--surface);border-top:1px solid var(--line);display:flex;padding:6px max(8px,env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left));box-shadow:0 -2px 12px rgba(30,64,175,.08);}
@media (min-width:900px){
  body{padding-bottom:32px;}
  .tabbar{display:none;}
  .topnav{display:flex;}
  .topnav .tab{flex-direction:row;gap:6px;font-size:.9rem;padding:8px 12px;min-height:0;flex:0 0 auto;}
  .streak{margin-left:12px;}
}

/* ---------- Khung màn hình ---------- */
/* Chiều rộng linh hoạt: khung ngoài rộng, từng loại nội dung tự giới hạn bề rộng đọc được (xem khối RESPONSIVE cuối tệp) */
#app{max-width:1280px;margin:0 auto;padding:18px max(16px,env(safe-area-inset-right)) 10px max(16px,env(safe-area-inset-left));}
.screen{display:block;}
.screen-title{font-size:1.5rem;font-weight:800;margin:6px 0 4px;}
.screen-sub{color:var(--text-soft);font-size:.95rem;margin-bottom:10px;}
.section-title{font-size:1.1rem;font-weight:700;margin:20px 0 10px;}
.fine-print{font-size:.8rem;color:var(--text-soft);margin:6px 0;}
.draft-label{display:inline-block;font-size:.75rem;font-weight:700;color:var(--warn);background:var(--warn-soft);border-radius:999px;padding:2px 10px;margin:2px 0 8px;}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:12px 0;box-shadow:var(--shadow);}
.card h3{font-size:1.02rem;font-weight:700;margin-bottom:8px;}
.card p+p{margin-top:6px;}
.card-accent{border-color:var(--primary);background:var(--primary-soft);}
.card-next{border-left:6px solid var(--primary);}
.card-warn{background:var(--warn-soft);border-color:var(--warn);}
.plain-list{margin:0 0 8px;padding-left:20px;}
.plain-list li{margin:3px 0;}

/* ---------- Nút, ô nhập, nhãn ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 18px;border-radius:12px;border:1.5px solid transparent;font-weight:700;font-size:1rem;cursor:pointer;background:var(--surface-2);color:var(--text);margin:6px 6px 6px 0;text-align:center;}
.btn:disabled{opacity:.45;cursor:not-allowed;}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover:not(:disabled){background:var(--primary-d);}
.btn-soft{background:var(--primary-soft);color:var(--primary);}
.btn-ghost{background:transparent;color:var(--text-soft);border-color:var(--line);}
.btn-light{background:#fff;color:var(--primary);}
.btn-danger{background:var(--bad-soft);color:var(--bad);}
.btn-big{min-height:64px;font-size:1.2rem;border-radius:18px;}
.chip{display:inline-block;background:var(--primary-soft);color:var(--primary);border-radius:999px;padding:2px 10px;font-size:.75rem;font-weight:700;}
.chip-token{border:1.5px solid var(--line);background:var(--surface);color:var(--text);font-size:1.05rem;padding:8px 14px;cursor:pointer;margin:4px;border-radius:12px;font-weight:600;}
.badge{display:inline-block;border-radius:999px;padding:2px 10px;font-size:.72rem;font-weight:700;}
.badge-ok{background:var(--ok-soft);color:var(--ok);} .badge-info{background:var(--primary-soft);color:var(--primary);} .badge-muted{background:var(--surface-2);color:var(--text-soft);}
.input{width:100%;min-height:46px;padding:10px 12px;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);font-size:1rem;}
.input:focus,.btn:focus-visible,.tab:focus-visible,.quiz-opt:focus-visible{outline:3px solid var(--primary);outline-offset:2px;}
.input-big{min-height:54px;font-size:1.15rem;}
.field{display:flex;flex-direction:column;gap:4px;margin:10px 0;font-size:.9rem;font-weight:600;}
.mini-bar{height:6px;border-radius:4px;background:var(--surface-2);overflow:hidden;flex:1;}
.mini-fill{height:100%;background:var(--primary);width:0;}

/* ---------- Trang chủ ---------- */
.hero{background:linear-gradient(135deg,#2563eb,#1d4ed8 60%,#3b82f6);color:#fff;border-radius:20px;padding:22px 20px;margin:12px 0;box-shadow:0 6px 20px rgba(37,99,235,.35);}
.hero h2{font-size:1.4rem;font-weight:800;}
.hero p{opacity:.9;margin:6px 0 12px;}
.tile-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
@media (min-width:600px){.tile-grid{grid-template-columns:repeat(3,1fr);}}
.tile{position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:8px;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;cursor:pointer;box-shadow:var(--shadow);min-height:104px;}
.tile:hover{border-color:var(--primary);}
.tile-icon{font-size:1.7rem;line-height:1;}
.tile-text{display:flex;flex-direction:column;gap:2px;}
.tile-text strong{font-size:.98rem;} .tile-text span{font-size:.8rem;color:var(--text-soft);}
.tile .badge{position:absolute;top:10px;right:10px;}

/* ---------- Khóa học ---------- */
.stage-block{margin:22px 0;}
.stage-toggle{width:100%;display:flex;align-items:center;gap:10px;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;cursor:pointer;box-shadow:var(--shadow);}
.stage-toggle .stage-title{flex:1;}
.stage-count{font-size:.8rem;font-weight:700;color:var(--ok);}
.stage-caret{color:var(--text-soft);transition:transform .2s;}
.stage-toggle[aria-expanded="false"] .stage-caret{transform:rotate(-90deg);}
.stage-body{padding:6px 2px 0;}
.stage-title{font-size:1.15rem;font-weight:800;}
.stage-range{font-size:.8rem;font-weight:700;color:var(--text-soft);background:var(--surface-2);border-radius:999px;padding:2px 8px;}
.stage-goal{color:var(--text-soft);font-size:.9rem;margin:2px 0 10px;}
.stage-planned{color:var(--text-soft);font-style:italic;background:var(--surface-2);border-radius:12px;padding:10px 12px;}
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;}
.lesson-card{display:flex;flex-direction:column;gap:6px;text-align:left;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:14px;cursor:pointer;box-shadow:var(--shadow);}
.lesson-card:hover:not(:disabled){border-color:var(--primary);}
.lesson-card.st-locked{opacity:.55;cursor:not-allowed;}
.lesson-card.st-completed{border-color:var(--ok);}
.lesson-card-top{display:flex;align-items:center;justify-content:space-between;}
.lesson-num{font-weight:800;color:var(--primary);font-size:1.1rem;}
.lesson-card-title{font-size:1rem;font-weight:700;}
.lesson-card-info{font-size:.8rem;color:var(--text-soft);}
.lesson-card-draft{font-size:.7rem;color:var(--warn);font-weight:600;}

/* ---------- Một bài ---------- */
.step-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 0;border-top:1px solid var(--line);}
.step-row:first-of-type{border-top:none;}
.step-text{display:flex;flex-direction:column;gap:2px;} .step-stat{font-size:.82rem;color:var(--text-soft);}
.learn-card{text-align:center;padding:24px 16px;}
.learn-count{font-size:.8rem;color:var(--text-soft);margin-bottom:8px;}
.learn-text{font-size:2.2rem;font-weight:800;line-height:1.25;font-family:var(--font-cjk);word-break:break-word;}
.learn-pinyin{color:var(--primary);font-size:1.15rem;margin-top:4px;}
.learn-meaning{font-size:1.2rem;color:var(--ok);font-weight:700;margin-top:10px;}
.learn-audio,.learn-nav,.result-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:12px;}
.learn-nav{justify-content:space-between;}
.result-card{text-align:center;}
.result-pct{font-size:3rem;font-weight:800;} .result-pct.ok{color:var(--ok);} .result-pct.mid{color:var(--warn);} .result-pct.bad{color:var(--bad);}
.result-score{color:var(--text-soft);} .result-level{font-size:1.5rem;font-weight:800;color:var(--primary);margin:4px 0;}
.advice{background:var(--primary-soft);border-radius:12px;padding:10px 12px;margin-top:10px;text-align:left;}
.advice-passed{background:var(--ok-soft);} .advice-retry,.advice-review-then-retry,.advice-practice-low{background:var(--warn-soft);}
.skill-row,.attempt-row,.vocab-row,.wrong-row,.tr-line{display:flex;align-items:center;gap:10px;padding:6px 0;}
.skill-row span:first-child{min-width:110px;} .skill-pct{min-width:42px;text-align:right;font-weight:700;}
.attempt-row{justify-content:space-between;flex-wrap:wrap;} .attempt-row .ok{color:var(--ok);} .attempt-row .mid{color:var(--warn);} .attempt-row .bad{color:var(--bad);}
.wrong-row{border-top:1px solid var(--line);flex-wrap:wrap;} .wrong-text{font-weight:700;font-family:var(--font-cjk);} .wrong-meaning{color:var(--text-soft);flex:1;}
.vocab-tools{display:flex;gap:8px;margin-bottom:8px;} .vocab-tools .input:first-child{flex:1;} .vocab-tools .input:last-child{width:auto;}
.vocab-row{border-top:1px solid var(--line);} .vocab-text{display:flex;flex-direction:column;flex:1;}
.vocab-text strong{font-family:var(--font-cjk);}

/* ---------- Bài tập ---------- */
.quiz{max-width:640px;margin:0 auto;}
.quiz-head{margin-bottom:12px;} .quiz-bar{height:8px;border-radius:5px;background:var(--surface-2);overflow:hidden;}
.quiz-fill{height:100%;background:var(--primary);transition:width .3s;}
.quiz-meta{display:flex;align-items:center;gap:10px;margin-top:8px;font-size:.85rem;color:var(--text-soft);} .quiz-count{flex:1;}
.quiz-exit{border:none;background:transparent;color:var(--text-soft);cursor:pointer;text-decoration:underline;}
.quiz-body{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);}
.quiz-label{font-weight:700;color:var(--text-soft);font-size:.9rem;margin-bottom:8px;}
.quiz-text{font-size:1.9rem;font-weight:800;font-family:var(--font-cjk);line-height:1.3;word-break:break-word;}
.quiz-sub{color:var(--primary);font-size:1.05rem;margin-top:2px;}
.quiz-notice{color:var(--bad);font-size:.85rem;margin-top:8px;}
.quiz-options{display:grid;gap:10px;margin-top:14px;}
.quiz-opt{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;border:1.5px solid var(--line);background:var(--surface);border-radius:14px;padding:12px 14px;font-size:1.02rem;font-weight:600;cursor:pointer;min-height:52px;font-family:var(--font-cjk);}
.quiz-opt:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft);}
.quiz-opt.ok{border-color:var(--ok);background:var(--ok-soft);} .quiz-opt.bad{border-color:var(--bad);background:var(--bad-soft);} .quiz-opt.sel{border-color:var(--primary);background:var(--primary-soft);}
.quiz-opt:disabled{cursor:default;}
.quiz-opt-sub{font-size:.8rem;color:var(--primary);font-weight:500;}
.quiz-feedback{margin-top:14px;font-weight:700;} .quiz-feedback.ok{color:var(--ok);} .quiz-feedback.bad{color:var(--bad);}
.quiz-next{width:100%;margin:12px 0 0;}
.quiz-answer-area{min-height:58px;border:2px dashed var(--line);border-radius:14px;padding:6px;margin:14px 0 8px;}
.quiz-pool{display:flex;flex-wrap:wrap;margin-bottom:10px;}
.quiz-match{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px;} .quiz-match-col{display:grid;gap:8px;align-content:start;}
.quiz-audio{margin:10px 0;}

/* ---------- Tiến độ ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin:12px 0;}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px;text-align:center;box-shadow:var(--shadow);}
.stat-n{display:block;font-size:1.6rem;color:var(--primary);} .stat-l{font-size:.78rem;color:var(--text-soft);}
.bars{display:flex;align-items:flex-end;justify-content:space-between;gap:8px;height:150px;padding-top:6px;}
.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%;gap:2px;}
.bar{width:100%;max-width:34px;min-height:3px;background:var(--primary);border-radius:6px 6px 0 0;} .bar-n{font-size:.7rem;color:var(--text-soft);} .bar-l{font-size:.68rem;color:var(--text-soft);}

/* ---------- Tra cứu ---------- */
.tr-list{margin-top:10px;} .tr-row{padding:10px 14px;} .tr-lang{font-size:.7rem;font-weight:800;color:var(--text-soft);min-width:26px;} .tr-text{flex:1;font-family:var(--font-cjk);}

/* ---------- Flashcard (chủ đề cũ) ---------- */
.lang-picker{display:flex;align-items:center;gap:8px;padding:6px 0 10px;}
.lang-row{flex:1;display:flex;flex-direction:column;gap:6px;}
.lang-row-label{font-size:.66rem;color:var(--text-soft);text-transform:uppercase;letter-spacing:.04em;}
.lang-chips{display:flex;gap:6px;}
.lang-chip{border:1.5px solid var(--line);background:var(--surface);border-radius:10px;padding:6px 9px;font-size:1.05rem;line-height:1;cursor:pointer;min-height:38px;}
.lang-chip.active{border-color:var(--primary);background:var(--primary-soft);}
.lang-chip[disabled]{opacity:.25;cursor:not-allowed;}
.lang-swap{align-self:flex-end;margin-bottom:6px;width:34px;height:34px;border-radius:50%;background:var(--surface-2);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-soft);}
.lang-swap:active{transform:scale(.9);}
.topics{display:flex;gap:6px;padding:6px 0 4px;overflow-x:auto;}
.topic-btn{flex:0 0 auto;border:none;background:transparent;font-size:.9rem;font-weight:600;color:var(--text-soft);padding:8px 8px;position:relative;cursor:pointer;white-space:nowrap;}
.topic-btn::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--primary);border-radius:2px;transform:scaleX(0);transition:transform .25s ease;}
.topic-btn.active{color:var(--primary);} .topic-btn.active::after{transform:scaleX(1);}
.stage{padding:10px 0 6px;display:flex;flex-direction:column;align-items:center;}
.progress-track{width:100%;height:6px;background:var(--surface-2);border-radius:4px;overflow:hidden;}
.progress-fill{height:100%;width:0%;background:var(--primary);transition:width .3s ease;}
.progress-label{align-self:flex-end;font-size:.75rem;color:var(--text-soft);margin:4px 2px 12px;}
.card-wrap{width:100%;display:flex;align-items:center;gap:8px;}
.nav-arrow{flex:0 0 auto;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--text-soft);font-size:1.3rem;line-height:1;cursor:pointer;}
.nav-arrow:active{background:var(--surface-2);}
.stage .card{flex:1;position:relative;height:280px;border-radius:var(--radius);cursor:pointer;perspective:1200px;padding:0;margin:0;background:transparent;border:none;box-shadow:none;}
.card-face{position:absolute;inset:0;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:20px;backface-visibility:hidden;transition:transform .5s cubic-bezier(.4,.2,.2,1);}
.card-front{transform:rotateY(0deg);}
.card-back{transform:rotateY(180deg);background:linear-gradient(160deg,var(--surface),var(--surface-2));}
.card.flipped .card-front{transform:rotateY(-180deg);} .card.flipped .card-back{transform:rotateY(0deg);}
.audio-btn{position:absolute;top:12px;right:12px;border:none;background:var(--primary-soft);border-radius:50%;width:42px;height:42px;font-size:1.2rem;cursor:pointer;}
.target-text{font-family:var(--font-cjk);font-weight:800;font-size:2.3rem;text-align:center;line-height:1.3;}
.pinyin{font-size:1.05rem;color:var(--primary);}
.known-text{font-size:1.4rem;font-weight:700;text-align:center;color:var(--ok);}
.flip-hint{position:absolute;bottom:14px;font-size:.72rem;color:var(--text-soft);opacity:.8;}
.actions{width:100%;display:flex;gap:12px;margin-top:20px;}
.seal{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 8px 10px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface);cursor:pointer;transition:transform .12s ease;min-height:76px;}
.seal:active{transform:scale(.95);}
.seal-mark{font-weight:900;font-size:1.3rem;width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;}
.seal-text{font-size:.82rem;font-weight:700;color:var(--text-soft);}
.seal-no .seal-mark{color:var(--bad);background:var(--bad-soft);} .seal-yes .seal-mark{color:#fff;background:var(--ok);}
.foot{margin:24px 0 8px;text-align:center;color:var(--text-soft);font-size:.8rem;} .brush-rule{display:none;}

/* ---------- Thông báo ---------- */
.toast{position:fixed;left:50%;bottom:calc(86px + env(safe-area-inset-bottom));transform:translate(-50%,20px);max-width:min(92vw,440px);padding:12px 16px;border-radius:12px;background:#0f1b33;color:#fff;font-size:.95rem;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:100;}
.toast.show{opacity:1;transform:translate(-50%,0);} .toast.error{background:#b91c1c;}
@media (min-width:900px){.toast{bottom:20px;}}

@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important;}}

/* ---------- Loopa Kids ---------- */
.kids-title{color:var(--accent);}
.kids-bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:8px 0;}
.kid-ages,.kid-packs{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:12px 0;}
.kid-age,.kid-pack{border:3px solid var(--primary-soft);background:var(--surface);border-radius:24px;padding:18px 10px;font-size:1.25rem;font-weight:800;cursor:pointer;min-height:96px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;box-shadow:var(--shadow);}
.kid-age:hover,.kid-pack:hover{border-color:var(--accent);}
.kid-pack-icon{font-size:2.4rem;} .kid-stars{font-size:.9rem;color:var(--warn);font-weight:700;}
.kid-choices{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:14px;}
.kid-choice{border:3px solid var(--line);background:var(--surface);border-radius:24px;padding:10px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px;min-height:140px;}
.kid-choice.ok,.kid-wordbtn.ok{border-color:var(--ok);background:var(--ok-soft);} .kid-choice.bad,.kid-wordbtn.bad{border-color:var(--bad);background:var(--bad-soft);} .kid-choice.sel,.kid-wordbtn.sel{border-color:var(--primary);}
.kid-art{width:100%;max-width:120px;aspect-ratio:1;} .kid-art svg{width:100%;height:100%;} .kid-art-big{max-width:200px;margin:10px auto;}
.kid-word{font-size:1.1rem;font-weight:700;font-family:var(--font-cjk);}
.kid-words{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:12px;}
.kid-wordbtn{border:3px solid var(--line);background:var(--surface);border-radius:18px;padding:14px 8px;font-size:1.2rem;font-weight:700;cursor:pointer;min-height:64px;font-family:var(--font-cjk);}
.kid-match{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px;} .kid-match-col{display:grid;gap:10px;align-content:start;}

/* ================= RESPONSIVE: điện thoại → máy tính bàn ================= */
.tile:focus-visible,.lesson-card:focus-visible,.ot-choice:focus-visible,.stage-toggle:focus-visible,.seal:focus-visible,.kid-age:focus-visible,.kid-pack:focus-visible,.kid-choice:focus-visible,.ot-play:focus-visible,.ot-controls button:focus-visible,select:focus-visible,summary:focus-visible,.input:focus-visible{outline:3px solid var(--primary);outline-offset:2px;}
.home-top{display:grid;gap:0;}
.home-top > .card-next,.home-top > .card{margin-top:12px;}
.read-col{max-width:760px;margin-left:auto;margin-right:auto;}           /* màn hình đọc/biểu mẫu: cài đặt, góp ý */
#screen-lesson,#screen-hear,#screen-speak,#screen-translate,#screen-placement,#screen-review,#screen-progress{max-width:960px;margin-left:auto;margin-right:auto;}
#screen-settings,#screen-feedback{max-width:760px;margin-left:auto;margin-right:auto;}
.quiz{max-width:720px;}
@media (max-width:380px){
  .btn{padding:10px 12px;} .screen-title{font-size:1.3rem;} .learn-text,.quiz-text{font-size:1.6rem;} .target-text{font-size:1.9rem;}
  .tile{padding:12px;min-height:96px;} .tab{padding:6px 2px;font-size:.66rem;} .ot-controls{gap:8px;} .ot-controls .ot-big{min-width:80px;min-height:80px;}
}
@media (max-height:480px) and (orientation:landscape){
  body{padding-bottom:calc(60px + env(safe-area-inset-bottom));} .tab{min-height:40px;flex-direction:row;justify-content:center;gap:6px;} .stage .card{height:200px;}
  .toast{bottom:calc(66px + env(safe-area-inset-bottom));}
}
@media (min-width:700px){
  .tile-grid{grid-template-columns:repeat(3,1fr);} .stat-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));}
}
@media (min-width:900px){
  #app{padding-top:24px;padding-left:max(28px,env(safe-area-inset-left));padding-right:max(28px,env(safe-area-inset-right));}
  .appbar-in{padding-left:max(28px,env(safe-area-inset-left));padding-right:max(28px,env(safe-area-inset-right));}
  .home-top{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);column-gap:20px;align-items:stretch;}
  .home-top > .hero{grid-row:1 / span 2;margin:12px 0;display:flex;flex-direction:column;justify-content:center;padding:32px 28px;}
  .home-top > .hero h2{font-size:1.7rem;}
  .home-top > .card-next,.home-top > .card{grid-column:2;margin:12px 0 0;}
  .home-top > .fine-print{grid-column:2;margin:0;}
  .lesson-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;}
  .learn-card{padding:36px 28px;} .learn-text{font-size:2.8rem;}
  .stage .card{height:340px;} .quiz-options{grid-template-columns:1fr 1fr;}
  .onetap{max-width:960px;margin:0 auto;}
  .ot-grid{grid-template-columns:repeat(3,1fr);}
  .ot-now{min-height:150px;} .ot-now-target{font-size:2.6rem;}
  .kid-ages,.kid-packs{grid-template-columns:repeat(3,1fr);} .kid-choices{grid-template-columns:repeat(4,1fr);} .kid-words{grid-template-columns:repeat(4,1fr);}
}
@media (min-width:1200px){
  .tile-grid{grid-template-columns:repeat(4,1fr);}
  .lesson-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));}
}
@media (min-width:1700px){ #app,.appbar-in{max-width:1440px;} .tile-grid{grid-template-columns:repeat(5,1fr);} }
body.ot-driving .onetap{max-width:none;}

/* ---------- Góp ý & Đánh giá ---------- */
.fb-stars{display:flex;align-items:center;flex-wrap:wrap;gap:6px;}
.fb-star{min-width:48px;min-height:48px;border-radius:12px;border:1.5px solid var(--line);background:var(--surface);color:var(--text-soft);font-size:1.6rem;line-height:1;cursor:pointer;}
.fb-star.on{color:#d97706;border-color:#d97706;background:var(--warn-soft);}
.fb-star:focus-visible,.foot-link:focus-visible{outline:3px solid var(--primary);outline-offset:2px;}
.fb-clear{margin:0;min-height:48px;}
.fb-text{resize:vertical;min-height:90px;font-size:1rem;line-height:1.4;}
.fb-hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0;}
.fb-error{color:var(--bad);background:var(--bad-soft);border-radius:12px;padding:10px 12px;font-weight:600;margin:10px 0;}
.fb-send{width:100%;margin:10px 0 0;}
.fb-thanks{font-size:1.1rem;font-weight:600;line-height:1.5;margin-bottom:8px;}
.site-foot{text-align:center;padding:0 16px;}
.foot-link{border:none;background:transparent;color:var(--text-soft);text-decoration:underline;font-size:.9rem;min-height:44px;padding:8px 14px;cursor:pointer;}
body.ot-driving .site-foot{display:none;}