/* HT Deutsch · Kiểm tra trình độ */
body{min-height:100vh}
.w{width:min(880px,calc(100% - 32px));margin:0 auto;padding-bottom:60px}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 0;flex-wrap:wrap}
.top-links{display:flex;gap:8px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:11px;color:#fff;text-decoration:none}
.brand .sun{width:32px;height:32px;border-radius:50%;background:radial-gradient(circle at 34% 30%,#FFF3C8 0,#F5C451 30%,#D98B16 70%,#8A4A07 100%);box-shadow:0 0 20px rgba(245,196,81,.5);flex:none}
.brand b{display:block;font-family:var(--f-d);font-size:19px;font-weight:600;line-height:1.1}
.brand small{display:block;font-size:10.5px;color:var(--ink3);letter-spacing:.18em;text-transform:uppercase}
.glass{background:var(--glass);border:1px solid var(--line);border-radius:var(--r);backdrop-filter:blur(10px)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:999px;border:1px solid var(--line2);background:transparent;color:#fff;font-weight:600;text-decoration:none;cursor:pointer;transition:border-color .15s,background .15s,transform .15s}
.btn:hover{border-color:var(--gold);color:#fff}
.btn.gold{background:var(--gold);border-color:var(--gold);color:#1a1300}
.btn.gold:hover{background:var(--gold2)}
.btn.ghost{border-color:transparent;color:var(--ink3)}
.btn.small{min-height:36px;font-size:14px;padding:0 12px}
.btn.big{min-height:54px;padding:0 28px;font-size:17px}
.btn:active{transform:scale(.97)}
.kick{color:var(--gold);letter-spacing:.16em;font-size:12px;font-weight:700;text-transform:uppercase;margin:0}
.lead{color:var(--ink2);font-size:16.5px;max-width:620px;margin:12px 0 0}

.kt-hero{padding:38px clamp(20px,5vw,48px);margin-top:14px;text-align:left}
.kt-hero h1{font-size:clamp(30px,5.4vw,50px);margin:10px 0 0;font-weight:600}
.kt-hero h1 em{font-style:normal;color:var(--teal)}
.kt-facts{display:flex;gap:10px;flex-wrap:wrap;list-style:none;padding:0;margin:22px 0 0}
.kt-facts li{display:flex;flex-direction:column;padding:10px 16px;border-radius:14px;background:var(--card);border:1px solid var(--line);min-width:110px}
.kt-facts b{font-family:var(--f-d);font-size:20px;color:#fff}
.kt-facts span{font-size:12.5px;color:var(--ink3)}
.kt-cta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:26px}
.kt-last{font-size:14px;color:var(--ink3)}

.kt-prog{display:grid;grid-template-columns:1fr auto;gap:8px 14px;align-items:center;margin:18px 0 12px}
.kt-lv{display:flex;gap:6px;grid-column:1/-1}
.kt-lv span{font-size:12px;font-weight:700;letter-spacing:.06em;padding:4px 10px;border-radius:999px;border:1px solid var(--line);color:var(--ink3)}
.kt-lv span.now{border-color:var(--teal);color:var(--teal);background:rgba(94,234,212,.1)}
.kt-lv span.ok{border-color:var(--gold);color:var(--gold)}
.kt-bar{height:8px;border-radius:99px;background:var(--card2);overflow:hidden}
.kt-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--violet));transition:width .35s}
.kt-count{font-size:13px;color:var(--ink3);font-variant-numeric:tabular-nums}
.kt-card{padding:clamp(20px,4vw,34px)}
.kt-q{font-family:var(--f-d);font-size:clamp(20px,3.4vw,27px);color:#fff;line-height:1.35;margin:0 0 18px;font-weight:600}
.kt-opts{display:grid;gap:10px}
@media (min-width:640px){.kt-opts{grid-template-columns:1fr 1fr}}
.kt-opt{display:flex;align-items:center;gap:12px;text-align:left;padding:14px 16px;border-radius:14px;border:1px solid var(--line2);background:var(--card);color:#fff;font-size:17px;cursor:pointer;transition:border-color .15s,transform .15s}
.kt-opt kbd{flex:none;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:rgba(255,255,255,.08);font:700 12px var(--f-b);color:var(--ink3)}
.kt-opt:hover{border-color:var(--teal)}
.kt-opt:disabled{cursor:default}
.kt-opt.ok{border-color:var(--ok);background:rgba(94,234,212,.14)}
.kt-opt.no{border-color:var(--bad);background:rgba(255,107,127,.14);animation:kt-shake .3s}
@keyframes kt-shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.kt-fb{margin-top:16px;padding:14px 16px;border-radius:14px;background:rgba(255,255,255,.05);border-left:3px solid var(--teal);font-size:15px;line-height:1.55}
.kt-fb.no{border-left-color:var(--bad)}
.kt-fb b{color:#fff}
.kt-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:16px}
.kt-row.center{justify-content:center}

.kt-res-top{padding:clamp(24px,5vw,44px);text-align:center;margin-top:14px}
.kt-level{display:inline-grid;place-items:center;width:120px;height:120px;border-radius:50%;margin:14px auto 6px;font-family:var(--f-d);font-size:46px;font-weight:700;color:#1a1300;background:radial-gradient(circle at 34% 30%,#FFF3C8 0,#F5C451 35%,#D98B16 75%,#8A4A07 100%);box-shadow:0 0 50px rgba(245,196,81,.45);animation:kt-pop .6s cubic-bezier(.2,1.4,.4,1)}
@keyframes kt-pop{from{transform:scale(.4);opacity:0}}
.kt-res-top h2{font-size:clamp(24px,4vw,36px);margin:6px 0 0}
.kt-res-top .lead{margin:12px auto 0}
.kt-levels{display:grid;gap:8px;max-width:520px;margin:24px auto 0;text-align:left}
.kt-levels div{display:grid;grid-template-columns:38px 1fr 54px;gap:10px;align-items:center;font-size:14px}
.kt-levels b{font-family:var(--f-d);color:#fff}
.kt-levels .tr{height:10px;border-radius:99px;background:var(--card2);overflow:hidden}
.kt-levels .tr i{display:block;height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--teal),var(--violet));transition:width .8s}
.kt-levels .pass .tr i{background:linear-gradient(90deg,var(--gold),var(--gold2))}
.kt-levels small{color:var(--ink3);text-align:right;font-variant-numeric:tabular-nums}
.kt-levels .skip{opacity:.45}
.kt-h2{font-size:22px;margin:34px 0 14px}
.kt-recs{display:grid;gap:12px}
@media (min-width:700px){.kt-recs{grid-template-columns:1fr 1fr}}
.kt-rec{display:flex;flex-direction:column;gap:8px;padding:20px 22px;text-decoration:none;color:var(--ink2);position:relative;overflow:hidden;transition:border-color .2s,transform .2s}
.kt-rec:hover{border-color:var(--line2);transform:translateY(-2px);color:var(--ink2)}
.kt-rec .ic{font-size:26px}
.kt-rec b{font-family:var(--f-d);font-size:19px;color:#fff}
.kt-rec span{font-size:14.5px;line-height:1.5}
.kt-rec em{font-style:normal;color:var(--teal);font-weight:700;font-size:14px;margin-top:auto}
.kt-rec.main{border-color:rgba(255,179,71,.5);background:radial-gradient(90% 120% at 100% 0%,rgba(255,179,71,.16),transparent 55%),var(--glass)}
.kt-review{margin-top:22px;padding:14px 20px}
.kt-review summary{cursor:pointer;color:#fff;font-weight:600}
.kt-rv{padding:12px 0;border-top:1px solid var(--line);font-size:14.5px}
.kt-rv:first-child{border-top:0}
.kt-rv .q{color:#fff}
.kt-rv .lvl{font-size:11px;font-weight:700;letter-spacing:.08em;color:var(--ink3);margin-right:6px}
.kt-rv .ok{color:var(--ok)}.kt-rv .no{color:var(--bad)}
.foot{text-align:center;color:var(--ink3);font-size:13px;margin-top:40px}