:root{--bg:#07080c;--s0:#0e1018;--s1:#14171f;--s2:#1c2030;--bd:#252b3b;--bd2:#2e3650;--amber:#8b5cf6;--amber-d:#7c3aed;--amber-g:rgba(139,92,246,.12);--amber-gb:rgba(139,92,246,.06);--cyan:#a78bfa;--green:#10b981;--green-g:rgba(16,185,129,.12);--red:#f43f5e;--red-g:rgba(244,63,94,.12);--yellow:#fbbf24;--t0:#f8fafc;--t1:#cbd5e1;--t2:#64748b;--t3:#374151;--syne:'Syne',sans-serif;--fig:'Figtree',sans-serif;--mono:'JetBrains Mono',monospace;--r-sm:8px;--r-md:14px;--r-lg:20px;--r-xl:28px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;height:100%}
body{background:var(--bg);color:var(--t0);font-family:var(--fig);min-height:100%;overflow-x:hidden;-webkit-font-smoothing:antialiased}
button{font-family:var(--fig)}
img{max-width:100%}

body::before{content:'';position:fixed;inset:0;background-image:linear-gradient(var(--s0) 1px,transparent 1px),linear-gradient(90deg,var(--s0) 1px,transparent 1px);background-size:48px 48px;opacity:.35;pointer-events:none;z-index:0}
body::after{content:'';position:fixed;inset:0;background:radial-gradient(ellipse 70% 50% at 50% 0%,rgba(139,92,246,.05) 0%,transparent 70%);pointer-events:none;z-index:0}

#app{position:relative;z-index:1;min-height:100vh;display:flex;flex-direction:column}

/* ── TOPBAR ── */
.topbar{position:sticky;top:0;z-index:200;background:rgba(7,8,12,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--bd);height:58px;display:flex;align-items:center;padding:0 1.5rem;gap:1rem;justify-content:space-between}
.topbar-logo{display:flex;align-items:center;gap:.75rem;cursor:pointer}
.logo-chip{background:linear-gradient(135deg,var(--amber),var(--amber-d));color:#000;font-family:var(--mono);font-weight:700;font-size:.72rem;letter-spacing:.06em;padding:.25rem .55rem;border-radius:6px}
.logo-title{font-family:var(--syne);font-size:.95rem;font-weight:700;color:var(--t0)}
.logo-title span{color:var(--t2);font-weight:600}
.topbar-right{display:flex;align-items:center;gap:1rem}

#timer-wrap{display:flex;align-items:center;gap:.5rem;background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-sm);padding:.3rem .7rem;font-family:var(--mono);font-size:.85rem;color:var(--t2);transition:all .3s}
#timer-wrap .dot{width:7px;height:7px;border-radius:50%;background:var(--t3);transition:background .3s}
#timer-wrap.running .dot{background:var(--green);animation:blink 1.2s ease-in-out infinite}
#timer-wrap.warn{border-color:rgba(251,191,36,.4);color:var(--yellow)}
#timer-wrap.warn .dot{background:var(--yellow)}
#timer-wrap.danger{border-color:rgba(244,63,94,.5);color:var(--red)}
#timer-wrap.danger .dot{background:var(--red);animation:blink .6s ease-in-out infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}
#timer-val{font-variant-numeric:tabular-nums}

/* ── SCREENS ── */
.screen{display:none;flex:1}
.screen.active{display:flex}

/* ── HOME ── */
#home{flex-direction:column;align-items:center;padding:2.5rem 1.5rem 4rem}
.home-hero{text-align:center;margin-bottom:3rem;animation:fadeUp .5s ease both}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.hero-eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--amber);margin-bottom:.9rem;display:flex;align-items:center;justify-content:center;gap:.5rem}
.hero-eyebrow::before,.hero-eyebrow::after{content:'';width:28px;height:1px;background:var(--amber);opacity:.5}
.hero-title{font-family:var(--syne);font-size:clamp(2.2rem,5vw,3.4rem);font-weight:800;line-height:1.1;letter-spacing:-.02em;margin-bottom:.75rem}
.hero-title em{font-style:normal;color:var(--amber)}
.hero-sub{color:var(--t2);font-size:1rem;max-width:480px;margin:0 auto;line-height:1.65}

.config-grid{width:100%;max-width:720px;display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem;animation:fadeUp .5s .1s ease both}
@media(max-width:640px){.config-grid{grid-template-columns:1fr}}

.config-card{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-lg);padding:1.5rem;transition:border-color .2s}
.config-card:hover{border-color:var(--bd2)}
.config-card-title{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--t2);margin-bottom:1rem;display:flex;align-items:center;gap:.5rem}

.pill-group{display:flex;flex-wrap:wrap;gap:.5rem}
.pill{background:var(--s2);border:1px solid var(--bd);border-radius:9999px;padding:.4rem .95rem;font-size:.82rem;font-weight:500;color:var(--t1);cursor:pointer;transition:all .18s;white-space:nowrap}
.pill:hover{border-color:var(--amber);color:var(--amber)}
.pill.on{background:var(--amber-g);border-color:var(--amber);color:var(--amber);font-weight:600}

.select-wrap{position:relative}
.select-wrap select{appearance:none;width:100%;background:var(--s2);border:1px solid var(--bd);border-radius:var(--r-sm);padding:.55rem .9rem;color:var(--t0);font-family:var(--fig);font-size:.88rem;cursor:pointer;outline:none;transition:border-color .18s}
.select-wrap select:focus{border-color:var(--amber)}
.select-wrap::after{content:'▾';position:absolute;right:.75rem;top:50%;transform:translateY(-50%);color:var(--t2);pointer-events:none;font-size:.75rem}

.db-bar{width:100%;max-width:720px;background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-md);padding:1rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1.5rem;animation:fadeUp .5s .15s ease both}
.db-stat{display:flex;align-items:center;gap:.5rem;font-size:.82rem}
.db-stat-val{font-family:var(--mono);font-weight:700;color:var(--amber);font-size:.95rem}
.db-stat-lbl{color:var(--t2)}
.db-sep{width:1px;height:24px;background:var(--bd)}
@media(max-width:480px){.db-sep{display:none}}

.start-btn{width:100%;max-width:720px;background:linear-gradient(135deg,var(--amber) 0%,var(--amber-d) 100%);color:#000;border:none;border-radius:var(--r-lg);padding:1.05rem 2rem;font-family:var(--syne);font-size:1.05rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.6rem;transition:all .2s;animation:fadeUp .5s .2s ease both;letter-spacing:.01em;position:relative;overflow:hidden}
.start-btn::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.15) 0%,transparent 60%);opacity:0;transition:opacity .2s}
.start-btn:hover::before{opacity:1}
.start-btn:hover{transform:translateY(-2px);box-shadow:0 8px 32px rgba(139,92,246,.3)}
.start-btn:active{transform:translateY(0)}
.start-btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}

/* ── QUIZ ── */
#quiz{flex-direction:column;max-width:820px;width:100%;margin:0 auto;padding:1.75rem 1.5rem 4rem}

.quiz-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:.9rem;gap:1rem;flex-wrap:wrap}
.quiz-pos{font-family:var(--mono);font-size:.78rem;color:var(--t2)}
.quiz-pos strong{color:var(--t0)}
.quiz-live{display:flex;align-items:center;gap:.75rem;font-family:var(--mono);font-size:.78rem}
.live-item{display:flex;align-items:center;gap:.35rem}
.live-dot{width:8px;height:8px;border-radius:50%}
.live-dot.g{background:var(--green)}
.live-dot.r{background:var(--red)}
.live-dot.y{background:var(--yellow)}
.live-n{color:var(--t2)}

.pbar-wrap{height:3px;background:var(--bd);border-radius:99px;margin-bottom:1.5rem;overflow:hidden}
.pbar-fill{height:100%;background:linear-gradient(90deg,var(--amber),var(--amber-d));border-radius:99px;transition:width .5s cubic-bezier(.4,0,.2,1)}

.qnav-row{display:flex;align-items:flex-start;gap:.5rem;margin-bottom:1.5rem}
.qnav{display:flex;flex-wrap:wrap;gap:5px;flex:1;max-height:62px;overflow:hidden;transition:max-height .3s ease}
.qnav.expanded{max-height:380px;overflow-y:auto;padding-right:4px}
.qn-dot{width:24px;height:24px;border-radius:5px;background:var(--s2);border:1px solid var(--bd);cursor:pointer;font-family:var(--mono);font-size:.58rem;color:var(--t2);display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}
.qn-dot:hover{border-color:var(--amber)}
.qn-dot.current{border-color:var(--amber);background:var(--amber-g);color:var(--amber)}
.qn-dot.ok{background:rgba(16,185,129,.15);border-color:rgba(16,185,129,.4);color:var(--green)}
.qn-dot.bad{background:rgba(244,63,94,.12);border-color:rgba(244,63,94,.4);color:var(--red)}
.qnav-toggle{background:var(--s1);border:1px solid var(--bd);border-radius:5px;color:var(--t2);font-size:.65rem;cursor:pointer;padding:0 8px;height:24px;white-space:nowrap;flex-shrink:0}
.qnav-toggle:hover{border-color:var(--bd2);color:var(--t1)}

.q-card{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-xl);padding:2rem;margin-bottom:1rem;position:relative;overflow:hidden;animation:qSlide .22s ease both}
@keyframes qSlide{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:none}}
.q-card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--amber),transparent);opacity:0;transition:opacity .3s}
.q-card.answered::before{opacity:1}

.q-text{font-size:1.05rem;line-height:1.7;color:var(--t0);font-weight:500}
.q-img{margin-top:1.25rem;border-radius:10px;border:1px solid var(--bd);max-height:300px;object-fit:contain;display:block}

.answers{display:flex;flex-direction:column;gap:.625rem;margin-bottom:1.1rem}
.ans-btn{display:flex;align-items:center;gap:.9rem;background:var(--s1);border:1.5px solid var(--bd);border-radius:var(--r-md);padding:.9rem 1.1rem;cursor:pointer;text-align:left;color:var(--t1);font-family:var(--fig);font-size:.93rem;line-height:1.5;transition:border-color .15s,background .15s,transform .12s;width:100%}
.ans-btn:not(:disabled):hover{border-color:var(--amber);background:var(--amber-gb);transform:translateX(3px)}
.ans-btn:not(:disabled):hover .ans-key{background:var(--amber-g);border-color:var(--amber);color:var(--amber)}
.ans-btn:disabled{cursor:default}
.ans-key{flex-shrink:0;width:32px;height:32px;border-radius:8px;background:var(--s2);border:1.5px solid var(--bd);color:var(--t2);font-family:var(--mono);font-weight:700;font-size:.78rem;display:flex;align-items:center;justify-content:center;transition:all .15s}

.ans-btn.is-correct{border-color:var(--green)!important;background:var(--green-g)!important;transform:none!important;animation:popIn .2s ease}
.ans-btn.is-correct .ans-key{background:var(--green);border-color:var(--green);color:#fff}
.ans-btn.is-wrong{border-color:var(--red)!important;background:var(--red-g)!important;color:var(--t2)}
.ans-btn.is-wrong .ans-key{background:var(--red);border-color:var(--red);color:#fff}
.ans-btn.reveal{border-color:rgba(16,185,129,.5)!important;background:rgba(16,185,129,.06)!important}
.ans-btn.reveal .ans-key{background:var(--green);border-color:var(--green);color:#fff}
@keyframes popIn{0%{transform:scale(.97)}60%{transform:scale(1.015)}100%{transform:scale(1)}}

.feedback-box{border-radius:var(--r-md);padding:.85rem 1.1rem;font-size:.88rem;font-weight:500;display:none;align-items:flex-start;gap:.7rem;margin-bottom:1.1rem;animation:fadeUp .2s ease;line-height:1.55}
.feedback-box.show{display:flex}
.feedback-box.ok{background:var(--green-g);border:1px solid rgba(16,185,129,.3);color:var(--green)}
.feedback-box.err{background:var(--red-g);border:1px solid rgba(244,63,94,.3);color:#f87171}
.feedback-box.info{background:var(--amber-g);border:1px solid rgba(139,92,246,.3);color:var(--amber)}
.fb-icon{font-size:1rem;flex-shrink:0;margin-top:.05rem}
.fb-body{color:var(--t1)}
.fb-body strong{color:var(--green)}

.quiz-controls{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.kbd-hint{font-family:var(--mono);font-size:.68rem;color:var(--t2);display:flex;gap:.3rem;align-items:center;flex-wrap:wrap}
kbd{background:var(--s2);border:1px solid var(--bd);border-radius:4px;padding:.1rem .32rem;font-size:.65rem;color:var(--t1)}
.ctrl-btns{display:flex;gap:.6rem;align-items:center}

.btn-ghost{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-sm);padding:.6rem 1.1rem;color:var(--t1);font-size:.85rem;font-weight:500;cursor:pointer;transition:all .18s}
.btn-ghost:hover{border-color:var(--bd2);color:var(--t0)}
.btn-amber{background:linear-gradient(135deg,var(--amber),var(--amber-d));border:none;border-radius:var(--r-sm);padding:.65rem 1.3rem;color:#000;font-family:var(--syne);font-size:.88rem;font-weight:700;cursor:pointer;display:flex;align-items:center;gap:.4rem;transition:all .18s}
.btn-amber:hover{opacity:.9;transform:translateY(-1px);box-shadow:0 4px 16px rgba(139,92,246,.3)}
.btn-amber:active{transform:none}
.btn-amber:disabled{opacity:.35;cursor:not-allowed;transform:none;box-shadow:none}

/* ── RESULTS ── */
#results{flex-direction:column;align-items:center;padding:2.5rem 1.5rem 5rem;gap:1.5rem;max-width:720px;width:100%;margin:0 auto}
#results.active{display:flex}

.result-hero{text-align:center;animation:fadeUp .4s ease both}
.result-ring{width:140px;height:140px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 1.25rem;position:relative}
.result-ring svg{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:var(--s2);stroke-width:6}
.ring-fill{fill:none;stroke-width:6;stroke-linecap:round;transition:stroke-dashoffset 1.2s cubic-bezier(.4,0,.2,1)}
.ring-fill.pass{stroke:var(--green)}
.ring-fill.fail{stroke:var(--red)}
.ring-inner{position:relative;z-index:1;text-align:center}
.ring-pct{font-family:var(--syne);font-size:2rem;font-weight:800;line-height:1}
.ring-pct.pass{color:var(--green)}
.ring-pct.fail{color:var(--red)}
.ring-lbl{font-size:.7rem;color:var(--t2);margin-top:.2rem;font-family:var(--mono)}
.result-verdict{font-family:var(--syne);font-size:1.7rem;font-weight:800;margin-bottom:.35rem}
.result-verdict.pass{color:var(--green)}
.result-verdict.fail{color:var(--red)}
.result-note{color:var(--t2);font-size:.88rem}

.res-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:.75rem;width:100%;animation:fadeUp .4s .1s ease both}
@media(max-width:520px){.res-stats{grid-template-columns:repeat(2,1fr)}}
.res-stat{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-md);padding:1rem;text-align:center}
.res-stat-val{font-family:var(--syne);font-size:1.8rem;font-weight:800;line-height:1;margin-bottom:.25rem}
.res-stat-val.g{color:var(--green)}
.res-stat-val.r{color:var(--red)}
.res-stat-val.y{color:var(--yellow)}
.res-stat-lbl{font-size:.75rem;color:var(--t2)}

.cat-card{width:100%;background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-lg);padding:1.5rem;animation:fadeUp .4s .15s ease both}
.cat-card h3{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--t2);margin-bottom:1.1rem}
.cat-row{display:grid;grid-template-columns:140px 1fr 52px;align-items:center;gap:.75rem;margin-bottom:.65rem}
@media(max-width:420px){.cat-row{grid-template-columns:100px 1fr 44px}}
.cat-name{font-size:.8rem;color:var(--t1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cat-track{height:6px;background:var(--s2);border-radius:99px;overflow:hidden}
.cat-fill{height:100%;border-radius:99px;transition:width .8s cubic-bezier(.4,0,.2,1)}
.cat-pct{font-family:var(--mono);font-size:.75rem;text-align:right;color:var(--t2)}

.res-actions{display:flex;gap:.75rem;flex-wrap:wrap;justify-content:center;width:100%;animation:fadeUp .4s .2s ease both}

/* ── REVIEW ── */
#review{flex-direction:column;max-width:720px;width:100%;margin:0 auto;padding:2rem 1.5rem 4rem;gap:1rem}
#review.active{display:flex}
.review-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem}
.review-header h2{font-family:var(--syne);font-size:1.3rem;font-weight:700}
.rev-filters{display:flex;gap:.5rem;flex-wrap:wrap}
.rev-filter{background:var(--s2);border:1px solid var(--bd);border-radius:99px;padding:.3rem .8rem;font-size:.78rem;color:var(--t2);cursor:pointer;transition:all .15s}
.rev-filter:hover{border-color:var(--bd2);color:var(--t1)}
.rev-filter.active{background:var(--amber-g);border-color:var(--amber);color:var(--amber)}

.rev-card{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-lg);padding:1.25rem;transition:border-color .2s}
.rev-card.ok-card{border-color:rgba(16,185,129,.25)}
.rev-card.bad-card{border-color:rgba(244,63,94,.2)}
.rev-num{font-family:var(--mono);font-size:.7rem;color:var(--t2);margin-bottom:.5rem}
.rev-q{font-size:.9rem;color:var(--t1);line-height:1.55;margin-bottom:.9rem}
.rev-opts{display:flex;flex-direction:column;gap:.35rem}
.rev-opt{font-size:.8rem;color:var(--t2);padding:.35rem .65rem;border-radius:6px;display:flex;gap:.5rem}
.rev-opt.was-correct{background:var(--green-g);color:var(--green)}
.rev-opt.was-wrong{background:var(--red-g);color:var(--red)}
.rev-tag{font-family:var(--mono);font-weight:700;font-size:.72rem}

/* ── AUTH ── */
#login,#register{
  position:fixed;
  top:58px;left:0;right:0;bottom:0;
  flex-direction:column;align-items:center;justify-content:center;
  padding:1.5rem;
  background:var(--bg);
  z-index:100;
  overflow-y:auto;
}
#login.active,#register.active{display:flex}
.auth-card{
  background:var(--s1);
  border:1px solid var(--bd);
  border-radius:var(--r-xl);
  padding:2.25rem;
  width:100%;max-width:420px;
  position:relative;z-index:2;
}
.auth-card h2{
  font-family:var(--syne);font-size:1.5rem;font-weight:800;
  margin-bottom:.3rem;color:var(--t0);
}
.auth-card>p{color:var(--t2);font-size:.85rem;margin-bottom:1.75rem;line-height:1.5}
.field{display:flex;flex-direction:column;gap:.45rem;margin-bottom:1.1rem}
.field label{font-size:.78rem;color:var(--t2);font-weight:600;letter-spacing:.02em}
.field input{
  background:var(--s2);border:1.5px solid var(--bd);
  border-radius:var(--r-sm);padding:.7rem 1rem;
  color:var(--t0);font-family:var(--fig);font-size:.95rem;
  outline:none;transition:border-color .18s;width:100%;
}
.field input:focus{border-color:var(--amber)}
.field-err{color:var(--red);font-size:.75rem;margin-top:.3rem;min-height:1rem}
.btn-auth{
  width:100%;display:flex;align-items:center;justify-content:center;
  gap:.5rem;margin-top:.75rem;
  background:linear-gradient(135deg,var(--amber),var(--amber-d));
  color:#000;border:none;border-radius:var(--r-md);
  padding:.8rem 1.5rem;
  font-family:var(--syne);font-size:.95rem;font-weight:700;
  cursor:pointer;transition:opacity .18s,transform .1s;
}
.btn-auth:hover{opacity:.9;transform:translateY(-1px)}
.btn-auth:active{transform:none}
.btn-auth:disabled{opacity:.5;cursor:not-allowed;transform:none}
.auth-divider{
  text-align:center;margin:1.25rem 0 0;
  font-size:.82rem;color:var(--t2);
  display:flex;flex-direction:column;gap:.4rem;
}
.auth-divider a{
  color:var(--amber);cursor:pointer;
  text-decoration:none;font-weight:500;
}
.auth-divider a:hover{text-decoration:underline}

/* ── PROFIL ── */
#profile{
  flex-direction:column;
  align-items:center;
  width:100%;
  padding:2.5rem 1.5rem 4rem;
  gap:1.25rem;
  min-height:calc(100vh - 58px);
}
#profile.active{display:flex}
#profile-inner{
  width:100%;
  max-width:720px;
  display:flex;
  flex-direction:column;
  gap:1.25rem;
}
/* Gdy niezalogowany — wyśrodkuj jak auth */
#profile.active.not-logged{
  position:fixed;
  top:58px;left:0;right:0;bottom:0;
  max-width:100%;margin:0;padding:1.5rem;
  align-items:center;justify-content:center;
  background:var(--bg);z-index:100;
  flex-direction:column;
}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem}
@media(max-width:500px){.stat-grid{grid-template-columns:repeat(2,1fr)}}
.stat-box{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-md);padding:1rem;text-align:center}
.stat-box-val{font-family:var(--syne);font-size:1.7rem;font-weight:800;line-height:1}
.stat-box-val.g{color:var(--green)}
.stat-box-val.v{color:var(--amber)}
.stat-box-lbl{font-size:.72rem;color:var(--t2);margin-top:.25rem}
.section-title{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--t2);margin-bottom:.75rem}
.history-item{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-md);padding:.9rem 1.1rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.hi-score{font-family:var(--syne);font-size:1.1rem;font-weight:700}
.hi-score.pass{color:var(--green)}
.hi-score.fail{color:var(--red)}
.hi-meta{font-size:.78rem;color:var(--t2);font-family:var(--mono)}
.hi-bar{flex:1;height:5px;background:var(--s2);border-radius:99px;overflow:hidden;min-width:60px}
.hi-fill{height:100%;border-radius:99px}
.weak-item{background:var(--s1);border:1px solid rgba(244,63,94,.2);border-radius:var(--r-md);padding:.85rem 1rem}
.weak-q{font-size:.85rem;color:var(--t1);line-height:1.5;margin-bottom:.4rem}
.weak-meta{font-family:var(--mono);font-size:.72rem;color:var(--red)}

/* User button in topbar */
.user-btn{display:flex;align-items:center;gap:.5rem;background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-sm);padding:.3rem .75rem;font-size:.82rem;color:var(--t1);cursor:pointer;transition:all .18s}
.user-btn:hover{border-color:var(--bd2);color:var(--t0)}
.user-avatar{width:22px;height:22px;border-radius:50%;background:var(--amber-g);border:1px solid var(--amber);display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:700;color:var(--amber)}
.login-btn{background:none;border:1px solid var(--bd);border-radius:var(--r-sm);padding:.3rem .75rem;font-size:.82rem;color:var(--t2);cursor:pointer;transition:all .18s}
.login-btn:hover{border-color:var(--amber);color:var(--amber)}

/* ── NAUKA ── */
#nauka{flex-direction:column;max-width:820px;width:100%;margin:0 auto;padding:1.5rem 1.5rem 4rem;gap:1rem}
#nauka.active{display:flex}
.nauka-search-wrap{position:sticky;top:58px;z-index:50;background:rgba(7,8,12,.9);backdrop-filter:blur(12px);padding:.75rem 0;display:flex;gap:.75rem;align-items:center}
.nauka-search{flex:1;background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-md);padding:.7rem 1rem;color:var(--t0);font-family:var(--fig);font-size:.95rem;outline:none;transition:border-color .18s}
.nauka-search:focus{border-color:var(--amber)}
.nauka-count{font-family:var(--mono);font-size:.75rem;color:var(--t2);white-space:nowrap}
.nauka-card{background:var(--s1);border:1px solid var(--bd);border-radius:var(--r-lg);padding:1.5rem;display:flex;flex-direction:column;gap:.9rem;animation:fadeUp .15s ease both}
.nauka-card:hover{border-color:var(--bd2)}
.nauka-num{font-family:var(--mono);font-size:.68rem;color:var(--t2)}
.nauka-q{font-size:.97rem;font-weight:500;line-height:1.65;color:var(--t0)}
.nauka-img{border-radius:8px;border:1px solid var(--bd);max-height:220px;object-fit:contain;display:block}
.nauka-opts{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}
@media(max-width:560px){.nauka-opts{grid-template-columns:1fr}}
.nauka-opt{display:flex;align-items:flex-start;gap:.65rem;padding:.65rem .85rem;border-radius:var(--r-sm);border:1px solid var(--bd);font-size:.85rem;color:var(--t2);line-height:1.45;background:var(--s2)}
.nauka-opt.correct{border-color:var(--green);background:var(--green-g);color:var(--t0)}
.nauka-opt.correct .nauka-key{background:var(--green);border-color:var(--green);color:#fff}
.nauka-key{flex-shrink:0;width:26px;height:26px;border-radius:6px;background:var(--s1);border:1px solid var(--bd);font-family:var(--mono);font-weight:700;font-size:.72rem;display:flex;align-items:center;justify-content:center;color:var(--t2)}
.nauka-empty{text-align:center;padding:3rem 1rem;color:var(--t2);font-size:.9rem}
mark{background:rgba(245,158,11,.25);color:var(--amber);border-radius:3px;padding:0 2px}
.hidden{display:none!important}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--bd2);border-radius:3px}
.spinner{width:18px;height:18px;border:2px solid rgba(0,0,0,.2);border-top-color:#000;border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}
@keyframes spin{to{transform:rotate(360deg)}}
#modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.75);z-index:500;display:none;align-items:center;justify-content:center;padding:1.5rem;backdrop-filter:blur(6px)}
#modal-overlay.show{display:flex}
#modal-box{background:var(--s1);border:1px solid var(--bd2);border-radius:var(--r-xl);padding:2rem 2.25rem;width:100%;max-width:400px;text-align:center;animation:fadeUp .2s ease}
#modal-box h3{font-family:var(--syne);font-size:1.2rem;font-weight:800;margin-bottom:.5rem;color:var(--t0)}
#modal-box p{color:var(--t2);font-size:.88rem;line-height:1.65;margin-bottom:1.5rem}
.modal-btns{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}
#toast{position:fixed;bottom:1.5rem;left:50%;transform:translateX(-50%) translateY(80px);background:var(--s2);border:1px solid var(--bd2);border-radius:var(--r-sm);padding:.55rem 1.1rem;font-size:.82rem;color:var(--t1);z-index:1000;transition:transform .3s cubic-bezier(.4,0,.2,1);white-space:nowrap;max-width:90vw;overflow:hidden}
#toast.up{transform:translateX(-50%) translateY(0)}