:root{
      --bg:#10120f;
      --panel:#171a17;
      --panel-2:#20231f;
      --text:#f5f3eb;
      --muted:#a9ada5;
      --line:rgba(255,255,255,.11);
      --blue:#7ad9d2;
      --lime:#d8aa2f;
      --orange:#e7bd4f;
      --red:#ef727c;
      --shadow:0 24px 70px rgba(0,0,0,.42);
      --radius:24px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      min-height:100vh;
      color:var(--text);
      background:
        radial-gradient(circle at 10% -10%, rgba(122,217,210,.18), transparent 34%),
        radial-gradient(circle at 92% 8%, rgba(216,170,47,.13), transparent 28%),
        var(--bg);
      font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
    }
    button,input,select{font:inherit}
    button{color:inherit}
    .app{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:24px 0 42px}
    .topbar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:24px}
    .brand{display:flex;align-items:center;min-height:44px}
    .brand-title{font-size:clamp(15px,2.25vw,22px);font-weight:950;letter-spacing:.15em;line-height:1.1;color:var(--text);white-space:nowrap}
    .brand-title span{color:var(--lime)}
    .top-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
    .icon-btn,.btn,.pill{border:1px solid var(--line);background:rgba(255,255,255,.035);border-radius:14px;cursor:pointer;transition:.2s ease}
    .icon-btn{width:44px;height:44px;display:grid;place-items:center}.icon-btn:hover,.btn:hover,.pill:hover{transform:translateY(-1px);border-color:rgba(255,255,255,.22)}
    .hero{display:grid;grid-template-columns:1.35fr .65fr;gap:18px;margin-bottom:18px}
    .hero-main,.stats-card,.toolbar,.stage,.info-panel{border:1px solid var(--line);background:rgba(18,22,28,.87);backdrop-filter:blur(12px);box-shadow:var(--shadow)}
    .hero-main{border-radius:30px;padding:28px;position:relative;overflow:hidden}
    .hero-main:after{content:"";position:absolute;width:210px;height:210px;border-radius:50%;right:-70px;bottom:-90px;background:linear-gradient(135deg,var(--blue),transparent);opacity:.32;filter:blur(1px)}
    .eyebrow{font-size:12px;font-weight:850;letter-spacing:.16em;color:var(--lime);text-transform:uppercase}
    h1{font-size:clamp(34px,5vw,62px);line-height:.95;margin:13px 0 16px;max-width:760px;letter-spacing:-.055em}
    .hero p{color:#bec6ce;line-height:1.55;margin:0;max-width:680px}
    .stats-card{border-radius:30px;padding:22px;display:flex;flex-direction:column;justify-content:space-between;min-height:210px}
    .stats-big{font-size:48px;font-weight:900;letter-spacing:-.04em}.stats-label{color:var(--muted);font-size:13px}.mini-progress{height:10px;background:#11130f;border-radius:999px;overflow:hidden;margin:16px 0}.mini-progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--lime));transition:.3s}
    .stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.stat-box{background:rgba(255,255,255,.035);border:1px solid var(--line);padding:10px;border-radius:14px}.stat-box strong{display:block;font-size:18px}.stat-box span{font-size:11px;color:var(--muted)}
    .category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}
    .category-card{border:1px solid var(--line);background:rgba(255,255,255,.035);border-radius:20px;padding:18px;cursor:pointer;text-align:left;transition:.22s ease;position:relative;overflow:hidden}
    .category-card:hover{transform:translateY(-2px);border-color:rgba(255,255,255,.24)}.category-card.active{background:linear-gradient(145deg,rgba(122,217,210,.17),rgba(216,170,47,.08));border-color:rgba(122,217,210,.58)}
    .category-card .num{font-size:12px;color:var(--lime);font-weight:850}.category-card h3{margin:8px 0 5px;font-size:18px}.category-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.4}.count-badge{position:absolute;right:14px;top:14px;padding:6px 9px;border-radius:999px;background:#11130f;border:1px solid var(--line);font-size:11px;color:#cbd2d8}
    .toolbar{border-radius:20px;padding:12px;display:grid;grid-template-columns:1.4fr repeat(3,minmax(120px,.45fr)) auto;gap:10px;margin-bottom:18px}
    .control{height:44px;border-radius:13px;border:1px solid var(--line);background:#141713;color:var(--text);padding:0 13px;outline:none;width:100%}.control:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(122,217,210,.13)}
    .btn{height:44px;padding:0 15px;font-weight:750}.btn.primary{background:var(--lime);color:#10120f;border-color:transparent}.btn.blue{background:var(--blue);border-color:transparent;color:#fff}.btn.danger{color:#ff9aa6}.btn.active{background:rgba(122,217,210,.17);border-color:rgba(122,217,210,.5)}
    .stage{border-radius:30px;padding:22px;min-height:570px;display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:18px}
    .study-area{min-width:0;display:flex;flex-direction:column}
    .card-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.meta-left,.meta-right{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.pill{padding:7px 10px;font-size:11px;color:#cbd2d8;cursor:default}.pill.level{color:var(--lime)}
    .flashcard-wrap{perspective:1400px;flex:1;min-height:350px;cursor:pointer;outline:none}.flashcard{height:100%;min-height:350px;position:relative;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.2,.72,.2,1)}.flashcard.flipped{transform:rotateY(180deg)}
    .face{position:absolute;inset:0;backface-visibility:hidden;border:1px solid var(--line);border-radius:28px;padding:28px;background:
      linear-gradient(145deg,rgba(255,255,255,.05),rgba(255,255,255,.015)),#11161c;display:flex;flex-direction:column;justify-content:space-between;overflow:auto}
    .face.back{transform:rotateY(180deg);background:linear-gradient(145deg,rgba(122,217,210,.13),rgba(216,170,47,.06)),#11161c}
    .face-label{font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--muted);font-weight:800}
    .front-word{font-size:clamp(38px,7vw,74px);line-height:1.02;letter-spacing:-.055em;margin:auto 0;font-weight:930;overflow-wrap:anywhere}.front-hint{color:var(--muted);font-size:13px}
    .translation-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0}.translation{border:1px solid var(--line);border-radius:17px;padding:14px;background:rgba(0,0,0,.14)}.translation span{display:block;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.12em;margin-bottom:7px}.translation strong{font-size:clamp(16px,2.4vw,22px);line-height:1.3}
    .forms{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}.form-box{border:1px solid var(--line);border-radius:15px;padding:11px;background:rgba(0,0,0,.16)}.form-box span{font-size:10px;color:var(--muted);display:block;margin-bottom:5px}.form-box strong{font-size:17px}
    .example{border-left:3px solid var(--lime);padding:12px 14px;background:rgba(216,170,47,.06);border-radius:0 13px 13px 0;line-height:1.5;color:#e5e9ed;margin-top:10px}.note{font-size:12px;line-height:1.45;color:#c7ced5;background:rgba(216,170,47,.08);border:1px solid rgba(216,170,47,.24);border-radius:12px;padding:10px;margin-top:10px}
    .actions{display:grid;grid-template-columns:auto 1fr 1fr auto;gap:10px;margin-top:14px}.actions .btn{height:48px}
    .side{border-left:1px solid var(--line);padding-left:18px;display:flex;flex-direction:column;gap:14px}.side h3{font-size:14px;margin:0}.side p{font-size:12px;color:var(--muted);line-height:1.45;margin:4px 0 0}.side-block{border:1px solid var(--line);background:rgba(255,255,255,.025);border-radius:17px;padding:14px}.shortcut{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-bottom:1px solid rgba(255,255,255,.06);font-size:12px}.shortcut:last-child{border-bottom:0}.key{border:1px solid var(--line);background:#11130f;border-radius:7px;padding:2px 7px;color:#dce2e7;font-size:11px}
    .quiz{display:none;flex:1;flex-direction:column}.quiz.active{display:flex}.study-area.quiz-mode .flashcard-wrap,.study-area.quiz-mode .card-meta,.study-area.quiz-mode .actions{display:none}.study-area.quiz-mode .quiz{display:flex}
    .quiz-question{border:1px solid var(--line);border-radius:24px;padding:26px;background:rgba(255,255,255,.025);margin-bottom:12px}.quiz-question small{color:var(--muted);text-transform:uppercase;letter-spacing:.12em}.quiz-question h2{font-size:clamp(30px,5vw,52px);margin:16px 0 0;letter-spacing:-.04em}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.quiz-option{min-height:82px;padding:14px;border:1px solid var(--line);border-radius:16px;background:#141713;text-align:left;cursor:pointer}.quiz-option:hover{border-color:rgba(255,255,255,.25)}.quiz-option.correct{border-color:rgba(216,170,47,.82);background:rgba(216,170,47,.11)}.quiz-option.wrong{border-color:rgba(255,102,119,.8);background:rgba(255,102,119,.09)}.quiz-feedback{min-height:50px;padding:12px 2px;color:#d6dce2}.quiz-next{align-self:flex-start}
    .empty{display:none;text-align:center;padding:70px 20px;color:var(--muted)}
    .info-panel{border-radius:24px;padding:22px;margin-top:18px}.info-panel summary{cursor:pointer;font-weight:800}.info-panel p,.info-panel li{color:#adb6bf;line-height:1.55;font-size:13px}.info-panel a{color:var(--lime)}
    .footer{color:#737e89;font-size:11px;text-align:center;padding:20px 0 0}
    dialog{border:1px solid var(--line);border-radius:22px;background:#12161c;color:var(--text);padding:0;max-width:520px;width:calc(100% - 28px);box-shadow:var(--shadow)}dialog::backdrop{background:rgba(0,0,0,.72);backdrop-filter:blur(4px)}.dialog-inner{padding:22px}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.dialog-head h2{margin:0;font-size:22px}.dialog-inner p{color:var(--muted);line-height:1.55;font-size:13px}.dialog-actions{display:flex;gap:9px;justify-content:flex-end;margin-top:18px}
    .toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,18px);opacity:0;pointer-events:none;padding:11px 16px;background:#f4f7f8;color:#10120f;border-radius:999px;font-weight:800;font-size:12px;transition:.25s;z-index:30}.toast.show{opacity:1;transform:translate(-50%,0)}
    @media(max-width:920px){.hero{grid-template-columns:1fr}.stats-card{min-height:180px}.toolbar{grid-template-columns:1fr 1fr 1fr}.toolbar .search{grid-column:1/-1}.stage{grid-template-columns:1fr}.side{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:16px;display:grid;grid-template-columns:1fr 1fr}.category-grid{grid-template-columns:1fr}.category-card{min-height:104px}}
    @media(max-width:620px){.app{width:min(100% - 20px,1180px);padding-top:14px}.topbar{align-items:flex-start}.brand-title{font-size:13px;letter-spacing:.105em;white-space:normal;max-width:240px}.hero-main{padding:22px}.toolbar{grid-template-columns:1fr 1fr}.toolbar .search{grid-column:1/-1}.toolbar .wide{grid-column:1/-1}.stage{padding:12px;border-radius:22px;min-height:610px}.face{padding:20px;border-radius:21px}.translation-grid,.quiz-options{grid-template-columns:1fr}.actions{grid-template-columns:1fr 1fr}.actions .icon-only{grid-row:2}.side{grid-template-columns:1fr}.forms{grid-template-columns:1fr}.front-word{font-size:48px}.top-actions .hide-mobile{display:none}}

.full-width{width:100%}
.mt-8{margin-top:8px}
.mt-10{margin-top:10px}
.load-error{
  margin:0 0 22px;
  padding:18px 20px;
  border:1px solid rgba(239,114,124,.55);
  border-radius:18px;
  background:rgba(239,114,124,.09);
  color:var(--text);
}
.load-error h2{margin:0 0 8px;font-size:1.05rem}
.load-error p{margin:6px 0;color:var(--muted);line-height:1.55}
.load-error code{color:var(--orange)}

.hub-back{text-decoration:none}
.form-box{position:relative;padding-right:48px}
.form-speak-btn{position:absolute;right:8px;top:50%;transform:translateY(-50%);width:34px;height:34px;border:1px solid var(--line);border-radius:10px;background:rgba(122,217,210,.1);color:var(--text);cursor:pointer;font-size:16px}
.form-speak-btn:hover{border-color:var(--blue);background:rgba(122,217,210,.18)}

/* Language switch RO / RU */
.language-switch{
  display:inline-flex;
  align-items:center;
  gap:3px;
  padding:4px;
  border:1px solid var(--line);
  border-radius:14px;
  background:rgba(255,255,255,.035);
}
.language-option{
  min-width:42px;
  height:34px;
  padding:0 10px;
  border:0;
  border-radius:10px;
  background:transparent;
  color:var(--muted);
  font-size:12px;
  font-weight:900;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.language-option:hover{color:var(--text);transform:translateY(-1px)}
.language-option.active{
  background:var(--lime);
  color:#10120f;
  box-shadow:0 7px 18px rgba(216,170,47,.16);
}
.language-option:focus-visible{outline:3px solid rgba(122,217,210,.28);outline-offset:2px}
.translation--primary{border-color:rgba(216,170,47,.42);background:rgba(216,170,47,.08)}
@media(max-width:620px){
  .top-actions{gap:6px}
  .language-switch{order:-1;width:100%;justify-content:flex-end;border:0;background:transparent;padding:0 0 4px}
  .language-option{height:32px;min-width:44px;border:1px solid var(--line);background:rgba(255,255,255,.035)}
  .language-option.active{border-color:transparent}
}