/* ==========================================================================
   Practice hub — level / group / subject / chapter (site + app)
   ========================================================================== */
.ste-segmented [aria-selected="true"]{background:var(--lime-400);color:#002417;box-shadow:none}

/* Stepper */
.stt-stepper{list-style:none;margin:0 0 24px;padding:0;display:flex;gap:6px;overflow-x:auto;scrollbar-width:none}
.stt-stepper::-webkit-scrollbar{display:none}
.stt-stepper li{flex:1 1 0;min-width:0}
.stt-stepper li>a,.stt-stepper li>span{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:12px;background:var(--surface);border:1px solid var(--line);color:var(--muted);text-decoration:none;font-size:var(--fs-sm);font-weight:600;min-width:0}
.stt-stepper__n{flex:none;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:var(--surface-2);font-size:12px}
.stt-stepper__l{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.stt-stepper .is-done>a{color:var(--text)}
.stt-stepper .is-done .stt-stepper__n{background:rgba(189,245,22,.16);color:var(--lime-400)}
.stt-stepper .is-done>a:hover{border-color:rgba(189,245,22,.4)}
.stt-stepper .is-current>span{background:rgba(189,245,22,.1);border-color:rgba(189,245,22,.45);color:var(--text)}
.stt-stepper .is-current .stt-stepper__n{background:var(--lime-400);color:#002417}
@media (max-width:560px){.stt-stepper li:not(.is-current) .stt-stepper__l{display:none}.stt-stepper li:not(.is-current){flex:0 0 auto}.stt-stepper li.is-current{flex:1 1 auto}}

.stt-hub-alert{margin:0 0 20px;display:flex;gap:10px;align-items:center}
.stt-hub-q{font-size:clamp(1.125rem,1rem + .5vw,1.375rem);margin:0 0 16px;font-weight:700}
.stt-hub-headrow{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-bottom:16px}
.stt-hub-headrow .stt-hub-q{margin:0}
.stt-hub-sub{font-size:1.0625rem;margin:28px 0 12px}

/* Level cards */
.stt-levels{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.stt-level-card{position:relative;display:flex;flex-direction:column;gap:4px;padding:26px 24px;border-radius:22px;text-decoration:none;color:var(--text);overflow:hidden;border:1px solid rgba(189,245,22,.18);background:radial-gradient(120% 90% at 100% 0%,rgba(189,245,22,.16) 0%,rgba(189,245,22,0) 55%),linear-gradient(160deg,#06432c 0%,#022a1b 100%);transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;min-height:200px}
.stt-level-card__tag{font-size:12px;color:var(--lime-400);font-weight:600;letter-spacing:.02em}
.stt-level-card__name{font-family:Inter,system-ui,sans-serif;font-size:clamp(2.75rem,2rem + 3vw,4rem);line-height:1;letter-spacing:-.03em;margin-top:10px}
.stt-level-card__sub{font-size:1.0625rem;font-weight:600;color:var(--text-2)}
.stt-level-card__meta{margin-top:auto;padding-top:18px;font-size:var(--fs-sm);color:var(--muted)}
.stt-level-card__go{position:absolute;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--lime-400);color:#002417;transition:transform .25s ease}
.stt-level-card:hover{transform:translateY(-3px);border-color:rgba(189,245,22,.5);box-shadow:0 24px 50px -24px rgba(0,0,0,.7)}
.stt-level-card:hover .stt-level-card__go{transform:translateX(4px)}
.stt-level-card--hsc{background:radial-gradient(120% 90% at 100% 0%,rgba(124,156,255,.18) 0%,rgba(124,156,255,0) 55%),linear-gradient(160deg,#06432c 0%,#022a1b 100%)}

/* Group cards */
.stt-groups{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.stt-group-card{display:flex;align-items:center;gap:14px;padding:18px;border-radius:18px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--text);transition:transform .2s ease,border-color .2s ease,background .2s ease}
.stt-group-card:hover{transform:translateY(-2px);border-color:rgba(189,245,22,.4);background:var(--surface-2)}
.stt-group-card__ico{flex:none;width:54px;height:54px;border-radius:16px;display:grid;place-items:center;background:rgba(189,245,22,.12);color:var(--lime-400)}
.stt-group-card--humanities .stt-group-card__ico{background:rgba(251,191,36,.13);color:#fcd34d}
.stt-group-card--business .stt-group-card__ico{background:rgba(124,156,255,.15);color:#a9bcff}
.stt-group-card__body{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}
.stt-group-card__body strong{font-size:1.0625rem}
.stt-group-card__body small{color:var(--muted);font-size:var(--fs-xs);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.stt-group-card__body em{font-style:normal;color:var(--text-2);font-size:var(--fs-xs)}
.stt-group-card__chev{flex:none;color:var(--muted)}

/* Subject cards */
.stt-subjects{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
@media (max-width:480px){.stt-subjects{grid-template-columns:1fr 1fr;gap:10px}}
.stt-subject-card{position:relative;display:flex;flex-direction:column;gap:6px;padding:16px;border-radius:16px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--text);min-height:132px;transition:transform .2s ease,border-color .2s ease}
.stt-subject-card:hover{transform:translateY(-2px);border-color:rgba(189,245,22,.4)}
.stt-subject-card__ico{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:rgba(189,245,22,.12);color:var(--lime-400);margin-bottom:4px}
.stt-subject-card__name{font-weight:700;line-height:1.35}
.stt-subject-card__meta{margin-top:auto;font-size:var(--fs-xs);color:var(--muted)}
.stt-subject-card__tag{position:absolute;top:14px;right:12px;font-size:10px;font-weight:600;padding:2px 7px;border-radius:999px;background:var(--surface-2);color:var(--text-2)}
.stt-subject-card.is-empty{opacity:.6}
.stt-subject-card.is-empty .stt-subject-card__ico{background:var(--surface-2);color:var(--muted)}

/* Subject detail */
.stt-subject-hero{display:grid;grid-template-columns:auto 1fr;gap:16px 18px;align-items:center;padding:22px;border-radius:20px;background:radial-gradient(90% 120% at 100% 0%,rgba(189,245,22,.13) 0%,rgba(189,245,22,0) 60%),linear-gradient(160deg,#06432c 0%,#022a1b 100%);border:1px solid rgba(189,245,22,.18)}
.stt-subject-hero__ico{width:64px;height:64px;border-radius:18px;display:grid;place-items:center;background:var(--lime-400);color:#002417}
.stt-subject-hero__title{margin:2px 0 4px;font-size:clamp(1.375rem,1.1rem + 1vw,1.875rem)}
.stt-subject-hero__meta{margin:0;color:var(--muted);font-size:var(--fs-sm)}
.stt-subject-hero__cta{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center}
.stt-subject-hero__best{color:var(--text-2)}
@media (min-width:860px){.stt-subject-hero{grid-template-columns:auto 1fr auto}.stt-subject-hero__cta{grid-column:auto;flex-direction:column;align-items:flex-end}}
@media (max-width:560px){.stt-subject-hero__cta .stt-pform,.stt-subject-hero__cta .ste-btn{width:100%}}

.stt-chapters{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.stt-chapter{display:flex;align-items:center;gap:14px;padding:12px 14px;border-radius:14px;background:var(--surface);border:1px solid var(--line);scroll-margin-top:90px}
.stt-chapter:target{border-color:var(--lime-400)}
.stt-chapter__n{flex:none;width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--surface-2);font-weight:700;font-size:var(--fs-sm);color:var(--lime-400)}
.stt-chapter__body{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.stt-chapter__body strong{font-weight:600;line-height:1.4}
.stt-chapter__body small{color:var(--muted);font-size:var(--fs-xs)}
.stt-chapter__best.excellent{color:var(--score-excellent)}
.stt-chapter__best.good{color:var(--score-good)}
.stt-chapter__best.average{color:var(--score-average)}
.stt-chapter__best.low{color:var(--score-low)}
.stt-chapter.is-empty{opacity:.55}
.stt-pform{margin:0;flex:none}
.stt-hub-tests{margin-top:36px}
.stt-hub-back{margin-top:28px}
.stt-pagehead--hub .stt-pagehead__lead{max-width:640px}
.stt-hub{padding-top:28px}
.stt-hub-tests .stt-sec-head__title{font-size:clamp(1.0625rem,1rem + .4vw,1.25rem)}