/* Kiểm tra đầu vào · IELTS Ngọc Tỉnh — trang công khai, mobile-first. Cùng hệ màu với Mind Study. */
:root{
  --navy:#003d82; --navy-2:#0b4f9e; --navy-deep:#012453; --orange:#fb8f2c; --orange-2:#ff9f45; --orange-ink:#3a1c00;
  --bg:#f2f5fa; --surface:#fff; --surface-2:#eaf0f8; --surface-3:#f7f9fc; --line:#dbe3ee; --ink:#12223a; --muted:#5b6a83; --faint:#8c99ae;
  --ok:#14995a; --ok-bg:#e2f6ec; --bad:#d23b2f; --bad-bg:#fde8e6; --warn:#b06200; --warn-bg:#fff2de;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --r:16px; --r-lg:22px; --shadow:0 1px 2px rgba(1,36,83,.06),0 6px 20px rgba(1,36,83,.06);
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--navy)}
h1,h2,h3{margin:0;line-height:1.25;text-wrap:balance}
p{margin:0}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px}
[hidden]{display:none!important}
.muted{color:var(--muted)} .small{font-size:14px}
.num{font-variant-numeric:tabular-nums}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.boot{min-height:100vh;display:grid;place-items:center;background:var(--navy)}
.boot-mark{width:64px;height:64px;border-radius:18px;background:var(--orange);color:var(--orange-ink);display:grid;place-items:center;font-weight:800;font-size:22px;animation:pulse 1.2s ease-in-out infinite}
@keyframes pulse{50%{transform:scale(.92);opacity:.8}}

/* buttons & fields */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1.5px solid transparent;border-radius:14px;padding:12px 20px;font-weight:700;font-size:16px;min-height:50px;text-decoration:none;transition:transform .08s,background .15s;text-align:center}
.btn:active{transform:scale(.98)}
.btn svg{width:20px;height:20px;flex:none}
.btn-primary{background:var(--orange);color:var(--orange-ink);box-shadow:0 3px 0 #d87412}
.btn-primary:hover{background:var(--orange-2)}
.btn-navy{background:var(--navy);color:#fff;box-shadow:0 3px 0 var(--navy-deep)}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:var(--surface-3)}
.btn-quiet{background:none;color:var(--navy);padding:8px 10px;min-height:0;font-weight:600}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none}
.field{display:flex;flex-direction:column;gap:6px}
.field>span{font-weight:600;font-size:14px}
.field>span em{font-style:normal;color:var(--faint);font-weight:500}
.input,.select{width:100%;border:1.5px solid var(--line);background:var(--surface);border-radius:12px;padding:12px 14px;font-size:16px;min-height:50px}
.input:focus,.select:focus{border-color:var(--navy);outline:none;box-shadow:0 0 0 3px rgba(0,61,130,.15)}
.grid2{display:grid;gap:14px}
@media (min-width:560px){.grid2{grid-template-columns:1fr 1fr}}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted)}
.check input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--navy);flex:none}
.err{background:var(--bad-bg);color:var(--bad);border-radius:12px;padding:10px 14px;font-weight:600;font-size:14px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* header */
.top{background:var(--navy);color:#fff;position:sticky;top:0;z-index:30;padding-top:env(safe-area-inset-top,0px)}
.top-in{max-width:1180px;margin:0 auto;height:60px;display:flex;align-items:center;gap:12px;padding:0 max(16px,env(safe-area-inset-right,0px)) 0 max(16px,env(safe-area-inset-left,0px))}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;min-width:0}
.brand-mark{width:34px;height:34px;border-radius:10px;background:var(--orange);color:var(--orange-ink);display:grid;place-items:center;font-weight:800;font-size:13px;flex:none;overflow:hidden}
.brand-mark img{width:100%;height:100%;object-fit:cover}
.brand-txt b{display:block;font-size:15px;line-height:1.2;white-space:nowrap}
.brand-txt small{display:block;font-size:12px;opacity:.75;line-height:1.2;white-space:nowrap}
.top-right{margin-left:auto;display:flex;gap:8px;align-items:center}
.home-link{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:99px;background:rgba(255,255,255,.12);color:#fff;font-weight:600;font-size:14px;text-decoration:none;white-space:nowrap}
.home-link:hover{background:rgba(255,255,255,.2)}
.home-link svg{width:16px;height:16px}
.timer{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:99px;background:var(--orange);color:var(--orange-ink);font-weight:800;font-size:15px;font-variant-numeric:tabular-nums}
.timer svg{width:16px;height:16px}
.timer.low{background:#ffd8d4;color:var(--bad);animation:pulse 1s ease-in-out infinite}
@media (max-width:420px){.brand-txt small{display:none}.home-link span{display:none}.home-link{padding:7px}}

/* steps bar */
.steps{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:calc(60px + env(safe-area-inset-top,0px));z-index:20}
.steps-in{max-width:1180px;margin:0 auto;display:flex;gap:6px;padding:10px 16px;overflow-x:auto}
.step{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--faint);white-space:nowrap;padding:4px 10px 4px 4px;border-radius:99px}
.step i{width:26px;height:26px;border-radius:99px;display:grid;place-items:center;background:var(--surface-2);font-style:normal;font-size:13px;font-weight:800}
.step.on{color:var(--navy);background:var(--surface-2)}
.step.on i{background:var(--navy);color:#fff}
.step.done{color:var(--ok)}
.step.done i{background:var(--ok-bg);color:var(--ok)}
.steps-meta{margin-left:auto;font-size:13px;color:var(--muted);white-space:nowrap;align-self:center}

/* landing */
.hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff;padding:36px 16px 96px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-90px;top:-90px;width:300px;height:300px;border-radius:50%;border:44px solid rgba(251,143,44,.16)}
.hero-in{max-width:1080px;margin:0 auto;position:relative;z-index:1}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#ffc58f}
.hero h1{font-size:clamp(28px,6vw,44px);font-weight:800;letter-spacing:-.02em;margin:10px 0 12px;max-width:680px}
.hero p.lead{font-size:17px;opacity:.88;max-width:620px}
.facts{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.fact{display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.14);padding:8px 14px;border-radius:99px;font-size:14px;font-weight:600}
.fact svg{width:18px;height:18px;color:#ffc58f}
.land{max-width:1080px;margin:-64px auto 40px;padding:0 16px;display:grid;gap:18px;position:relative;z-index:2}
@media (min-width:900px){.land{grid-template-columns:minmax(0,1fr) minmax(0,440px);align-items:start}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:20px;box-shadow:var(--shadow);min-width:0}
.card h2{font-size:20px}
.parts{display:grid;gap:12px;margin-top:6px}
.part{display:grid;grid-template-columns:44px 1fr;gap:12px;align-items:start}
.part-ic{width:44px;height:44px;border-radius:14px;background:var(--surface-2);color:var(--navy);display:grid;place-items:center;font-weight:800}
.part div>b{display:block}
.part span b{display:inline;color:var(--ink,inherit)}
.part span{font-size:14px;color:var(--muted)}
.ladder{display:grid;gap:6px;margin-top:4px}
.ladder a{display:flex;justify-content:space-between;gap:10px;padding:10px 12px;border-radius:12px;background:var(--surface-3);border:1px solid var(--line);text-decoration:none;color:var(--ink);font-size:14px}
.ladder a b{color:var(--navy)}
.ladder a span{color:var(--muted);font-variant-numeric:tabular-nums}
.note{background:var(--warn-bg);color:#6b3b00;border-radius:12px;padding:10px 14px;font-size:14px}
.resume{border:2px solid var(--orange)}

/* test layout */
.wrap{max-width:820px;margin:0 auto;padding:18px 16px 120px}
.part-head{margin-bottom:14px}
.part-head h2{font-size:22px}
.part-head p{color:var(--muted);font-size:15px;margin-top:4px}
.q{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px;margin-bottom:12px;scroll-margin-top:130px}
.q.miss{border-color:var(--orange);box-shadow:0 0 0 3px rgba(251,143,44,.18)}
.q-n{flex:none;display:inline-grid;place-items:center;min-width:28px;height:28px;border-radius:9px;background:var(--surface-2);color:var(--navy);font-weight:800;font-size:13px;margin-right:8px;padding:0 6px}
.q-t{font-weight:600;font-size:17px;display:flex;align-items:flex-start}
.q-t>span:not(.q-n){flex:1;padding-top:2px}
.opts{display:grid;gap:8px;margin-top:12px}
@media (min-width:600px){.opts.two{grid-template-columns:1fr 1fr}}
.opt{display:flex;align-items:center;gap:10px;text-align:left;width:100%;background:var(--surface-3);border:1.5px solid var(--line);border-radius:12px;padding:11px 12px;min-height:48px;font-size:16px}
.opt:hover{border-color:#b9c7da}
.opt i{width:26px;height:26px;border-radius:8px;border:1.5px solid var(--line);display:grid;place-items:center;font-style:normal;font-weight:800;font-size:13px;color:var(--muted);background:#fff;flex:none}
.opt.on{border-color:var(--navy);background:#e8f0fb}
.opt.on i{background:var(--navy);border-color:var(--navy);color:#fff}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip{border:1.5px solid var(--line);background:var(--surface-3);border-radius:10px;padding:8px 14px;font-weight:700;font-size:14px;min-height:42px}
.chip.on{background:var(--navy);border-color:var(--navy);color:#fff}
.txt{margin-top:10px;max-width:360px}
.gapline{font-size:17px;line-height:2}
.gapline input{display:inline-block;width:170px;max-width:60%;min-height:40px;padding:6px 10px;margin:0 4px;border:1.5px solid var(--line);border-radius:10px;font-size:16px;vertical-align:baseline}
.gapline input:focus{border-color:var(--navy);outline:none;box-shadow:0 0 0 3px rgba(0,61,130,.15)}
.instr{background:var(--surface-2);border-radius:12px;padding:10px 14px;font-size:14px;font-weight:600;color:var(--navy-deep);margin:18px 0 10px}

/* bottom action bar */
.bar{position:fixed;left:0;right:0;bottom:0;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-top:1px solid var(--line);z-index:25;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px))}
.bar-in{max-width:1180px;margin:0 auto;display:flex;gap:12px;align-items:center}
.bar-info{font-size:14px;color:var(--muted);flex:1;min-width:0}
.bar-info b{color:var(--ink)}
.saved{font-size:12px;color:var(--faint)}

/* reading split view */
.read{max-width:1180px;margin:0 auto;padding:12px 16px 120px}
.ptabs{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.ptab{border:1.5px solid var(--line);background:var(--surface);border-radius:99px;padding:8px 16px;font-weight:700;font-size:14px}
.ptab.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.ptab small{font-weight:600;opacity:.75;margin-left:4px}
.split{display:grid;gap:16px}
.passage{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:20px 22px;font-family:var(--serif);font-size:18px;line-height:1.75}
.passage h3{font-family:var(--serif);font-size:23px;margin-bottom:4px}
.passage .by{font-family:var(--sans);font-size:13px;color:var(--muted);margin-bottom:12px}
.passage p{margin:0 0 14px}
.passage p .pl{font-family:var(--sans);font-weight:800;color:var(--navy);margin-right:8px;font-size:15px}
.mob-switch{display:none}
@media (min-width:960px){
  .split{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);align-items:start}
  .split .passage,.split .qs{max-height:calc(100vh - 200px);overflow:auto;position:sticky;top:130px}
  .split .qs{padding-right:4px}
}
@media (max-width:959px){
  .mob-switch{display:flex;position:fixed;left:50%;transform:translateX(-50%);bottom:calc(84px + env(safe-area-inset-bottom,0px));z-index:26;background:var(--navy-deep);border-radius:99px;padding:4px;box-shadow:0 6px 20px rgba(1,36,83,.3)}
  .mob-switch button{border:0;background:none;color:#fff;font-weight:700;font-size:14px;padding:9px 16px;border-radius:99px}
  .mob-switch button.on{background:var(--orange);color:var(--orange-ink)}
  .split[data-view="q"] .passage{display:none}
  .split[data-view="p"] .qs{display:none}
}

/* writing */
.tasks{display:grid;gap:12px}
@media (min-width:700px){.tasks{grid-template-columns:1fr 1fr}}
.task-pick{text-align:left;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--r-lg);padding:18px;display:flex;flex-direction:column;gap:6px}
.task-pick:hover{border-color:var(--navy)}
.task-pick b{font-size:17px;color:var(--navy)}
.task-pick span{font-size:14px;color:var(--muted)}
.prompt{background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--orange);border-radius:var(--r);padding:16px 18px;white-space:pre-line;font-family:var(--serif);font-size:17px;line-height:1.65}
.essay{width:100%;min-height:340px;border:1.5px solid var(--line);border-radius:var(--r);padding:16px 18px;font-family:var(--serif);font-size:18px;line-height:1.7;background:#fff;resize:vertical}
.essay:focus{border-color:var(--navy);outline:none;box-shadow:0 0 0 3px rgba(0,61,130,.15)}
.wc{display:flex;justify-content:space-between;gap:10px;font-size:14px;color:var(--muted);margin-top:6px}
.wc b.ok{color:var(--ok)} .wc b.low{color:var(--warn)}

/* modal */
.overlay{position:fixed;inset:0;background:rgba(1,20,48,.55);z-index:60;display:flex;align-items:flex-end;justify-content:center;padding:16px}
@media (min-width:640px){.overlay{align-items:center}}
.modal{background:#fff;border-radius:22px;padding:22px;max-width:460px;width:100%;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.modal h3{font-size:20px;margin-bottom:8px}
.toast{position:fixed;left:50%;top:76px;transform:translateX(-50%);background:var(--navy-deep);color:#fff;padding:10px 18px;border-radius:12px;font-weight:600;z-index:70;box-shadow:0 8px 24px rgba(0,0,0,.2);max-width:calc(100% - 32px);text-align:center}

/* result */
.res-hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-deep) 100%);color:#fff;padding:30px 16px 90px;text-align:center}
.res-hero h1{font-size:clamp(24px,5vw,34px);margin:6px 0}
.res{max-width:760px;margin:-70px auto 40px;padding:0 16px;display:grid;gap:16px;position:relative;z-index:1}
/* 3.16.1: trang chào bài kiểm tra tại trung tâm — tách khối giới thiệu và thẻ nội dung, thêm khoảng thở */
.hero:has(+ .res){padding:52px 16px 60px}
.hero + .res{margin:36px auto 56px}
@media (max-width:600px){.hero:has(+ .res){padding:36px 16px 44px}.hero + .res{margin:24px auto 40px}}
.lvl{text-align:center;padding:26px 20px}
.lvl small{display:block;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.lvl b{display:block;font-size:clamp(34px,8vw,48px);font-weight:800;color:var(--navy);letter-spacing:-.02em;line-height:1.1;margin:8px 0 4px}
.lvl .band{display:inline-block;background:var(--orange);color:var(--orange-ink);font-weight:800;border-radius:99px;padding:5px 14px;font-size:15px}
.ladder-v{display:flex;gap:4px;margin:18px auto 0;max-width:420px}
.ladder-v i{flex:1;height:8px;border-radius:99px;background:var(--surface-2)}
.ladder-v i.on{background:var(--orange)}
.ladder-v i.me{background:var(--navy)}
.scores{display:grid;gap:12px}
.score{display:grid;grid-template-columns:1fr auto;gap:6px 12px;align-items:center}
.score .barx{grid-column:1/-1;height:10px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.score .barx em{display:block;height:100%;background:var(--navy);border-radius:99px}
.score b{font-variant-numeric:tabular-nums}
.fb{white-space:pre-line;font-size:16px;line-height:1.7}
.errs{width:100%;border-collapse:collapse;font-size:15px}
.errs td{padding:8px;border-bottom:1px solid var(--line);vertical-align:top}
.errs .o{color:var(--bad);text-decoration:line-through;text-decoration-color:rgba(210,59,47,.4)}
.errs .f{color:var(--ok);font-weight:600}
.tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{background:var(--surface-2);border-radius:99px;padding:5px 12px;font-size:14px;font-weight:600;color:var(--navy-deep)}
.cta{display:grid;gap:10px}
@media (min-width:560px){.cta{grid-template-columns:1fr 1fr}}
.foot{text-align:center;color:var(--faint);font-size:13px;padding:10px 16px 30px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- 3.7: bài online / bài tại trung tâm ---------- */
.btn-sm{min-height:40px;padding:8px 14px;font-size:15px;border-radius:12px}
.btn-danger{background:var(--bad);color:#fff;box-shadow:0 3px 0 #9e2a21}
.hint{color:var(--muted);font-size:14px}
.hint svg{width:16px;height:16px;vertical-align:-3px;margin-right:5px}
.tag.more{background:none;border:1px dashed var(--line);color:var(--muted)}
.full-test{border:1.5px dashed var(--orange);background:#fffaf4}
.full-test h2{display:flex;align-items:center;gap:8px}
.full-test h2 svg{width:22px;height:22px;color:var(--orange)}
.full-test .btn{align-self:flex-start}

/* Listening */
.l-player{display:flex;flex-wrap:wrap;align-items:center;gap:12px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;margin:14px 0 18px;box-shadow:var(--shadow);position:sticky;top:8px;z-index:5}
.l-player.on{border-color:var(--navy);background:#f4f8fe}
.l-live{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-variant-numeric:tabular-nums}
.l-prog{flex:1 1 160px;height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.l-prog i{display:block;height:100%;width:0;background:var(--navy);transition:width .4s linear}
.l-done{display:inline-flex;align-items:center;gap:8px;color:var(--ok);font-weight:700}
.l-done svg{width:20px;height:20px}
.l-qs{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;box-shadow:var(--shadow)}
.l-title{margin:10px 0 6px;font-size:18px;text-align:center}
.l-notes p{margin:6px 0;line-height:2.1}
.l-notes h5{font-size:16px;margin:16px 0 4px;color:var(--navy)}
.l-gap{display:inline-flex;align-items:center;gap:6px;margin:0 2px;border-radius:8px;padding:0 2px}
.l-gap i{font-style:normal;font-weight:700;font-size:13px;min-width:24px;height:24px;border-radius:7px;background:var(--navy);color:#fff;display:inline-grid;place-items:center}
.l-gap input{width:150px;max-width:44vw;border:1.5px solid var(--line);border-radius:8px;padding:4px 8px;background:#fff;line-height:1.4}
.l-gap input:focus{border-color:var(--navy);outline:none;box-shadow:0 0 0 3px rgba(0,61,130,.12)}
.l-gap.miss{background:var(--bad-bg)}
.recdot{width:10px;height:10px;border-radius:50%;background:var(--bad);flex:none;animation:pulse 1s ease-in-out infinite}

/* Speaking */
.sp-dots{display:flex;gap:8px;flex-wrap:wrap;margin:6px 0 14px}
.sp-dot{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:14px;background:var(--surface);border:1.5px solid var(--line);color:var(--muted)}
.sp-dot.on{border-color:var(--orange);color:var(--ink);box-shadow:0 0 0 3px rgba(251,143,44,.25)}
.sp-dot.done{background:var(--ok-bg);border-color:var(--ok);color:var(--ok)}
.sp-item .eyebrow{color:var(--orange);margin:0}
.sp-q{font-family:var(--serif);font-size:22px;line-height:1.4;font-weight:600}
.sp-card{font-family:var(--serif);font-size:18px;line-height:1.5;border:1.5px solid var(--navy);border-radius:14px;padding:16px 18px;background:#f8fbff}
.sp-card b{font-size:20px}
.sp-card p{margin:8px 0 2px}
.sp-card ul{margin:2px 0 6px 20px;padding:0}
.sp-rec{min-height:58px}
.recbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;border-radius:14px;padding:12px 14px;background:var(--surface-3);border:1px solid var(--line)}
.recbar.live{background:#fff5f4;border-color:#f3b8b2}
.recbar .num{font-size:22px;min-width:52px}
.sp-meter{flex:1 1 120px;height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.sp-meter i{display:block;height:100%;width:0;background:var(--ok);transition:width .08s}
.sp-wait{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.sp-spin{width:22px;height:22px;border-radius:50%;border:3px solid var(--surface-2);border-top-color:var(--navy);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.err-line{color:var(--bad);margin-bottom:10px;font-weight:600}
.ok-line{color:var(--ok);font-weight:600;display:flex;align-items:center;gap:6px}
.ok-line svg,.sp-end h3 svg{width:20px;height:20px;color:var(--ok)}
.sp-end h3{display:flex;align-items:center;gap:8px}
@media (max-width:640px){.sp-q{font-size:19px}.l-qs{padding:14px}.l-gap input{width:120px}}

/* Xem lại Reading */
.rv-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap}
.rv-sum{font-size:15px;color:var(--muted)} .rv-sum b{font-size:22px;color:var(--navy)}
.rv-pass{border-top:1px solid var(--line);padding-top:14px}
.rv-pass h3{font-size:17px;margin-bottom:8px} .rv-pass h3 small{font-weight:600;color:var(--muted);font-size:14px}
.rv-text summary{cursor:pointer;color:var(--navy);font-weight:600;font-size:15px;padding:4px 0}
.rv-text .passage{margin:8px 0 4px;max-height:420px;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:var(--surface-3)}
.rv-list{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
.rv-list li{display:flex;gap:10px;border-radius:12px;padding:10px 12px;border:1px solid var(--line)}
.rv-list li.ok{background:var(--ok-bg);border-color:#b5e5cb} .rv-list li.no{background:var(--bad-bg);border-color:#f3c1bb}
.rv-n{flex:none;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-weight:700;font-size:14px;background:#fff}
.rv-q{font-size:15px;margin-bottom:4px}
.rv-a{font-size:14px;display:flex;flex-wrap:wrap;gap:4px 12px;align-items:baseline}
.rv-mark{font-weight:800} li.ok .rv-mark{color:var(--ok)} li.no .rv-mark{color:var(--bad)}
.rv-key{color:var(--ink)} .rv-key b{color:var(--ok)}

/* Bài theo level: band từng kỹ năng */
.bandg{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.bandc{background:var(--surface-2,#f3f6fb);border-radius:14px;padding:12px 8px;text-align:center;display:grid;gap:2px}
.bandc small{font-size:13px;color:var(--muted);font-weight:600}
.bandc b{font-size:26px;color:var(--navy);line-height:1.2}
@media (max-width:420px){.bandg{grid-template-columns:1fr 1fr}}