@import url('https://fonts.googleapis.com/css2?family=Sora:wght@500;600;700;800&family=Karla:wght@400;500;700&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root{
  --bg:#171b22;
  --panel:#1d2330;
  --panel2:#242b38;
  --border:#313b49;
  --text:#eef1f5;
  --muted:#8fa0b3;
  --accent:#ef8544;
  --accent-dim:#7a4a2c;
  --blue:#5b9bd5;
  --success:#57cc8a;
  --error:#e8636b;
}

*{box-sizing:border-box;}
[hidden]{display:none !important;}
html,body{height:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:'Karla',system-ui,sans-serif;
  padding:32px 16px 48px;
  min-height:100vh;
}
h1,h2,h3{font-family:'Sora',system-ui,sans-serif;text-wrap:balance;margin:0;}
.mono{font-family:'IBM Plex Mono',ui-monospace,monospace;}
a{color:inherit;}

.wrap{max-width:640px;margin:0 auto;}

.head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-bottom:6px;
  flex-wrap:wrap;
}
.head h1{font-size:1.5rem;font-weight:800;letter-spacing:-0.01em;}
.tag{
  font-size:0.72rem;
  color:var(--accent);
  letter-spacing:0.08em;
  text-transform:uppercase;
  border:1px solid var(--accent-dim);
  background:rgba(239,133,68,0.08);
  padding:3px 8px;
  border-radius:4px;
}
.sub{color:var(--muted);font-size:0.95rem;margin-bottom:22px;}

.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:14px;
  padding:26px 24px 22px;
}

/* Name gate */
.name-form{display:flex;flex-direction:column;gap:14px;}
.name-form label{
  font-size:0.78rem;
  letter-spacing:0.05em;
  text-transform:uppercase;
  color:var(--muted);
}
.name-row{display:flex;gap:10px;}
input[type="text"], input[type="password"], input[type="email"]{
  flex:1;
  background:var(--panel2);
  border:1px solid var(--border);
  color:var(--text);
  border-radius:9px;
  padding:12px 14px;
  font-family:'Karla',sans-serif;
  font-size:1rem;
}
input[type="text"]:focus, input[type="password"]:focus, input[type="email"]:focus{outline:none;border-color:var(--blue);}
button{font-family:'IBM Plex Mono',monospace;cursor:pointer;}
.btn-primary{
  background:var(--accent);
  color:#20130a;
  border:none;
  border-radius:9px;
  padding:0 22px;
  font-weight:600;
  font-size:0.9rem;
}
.btn-primary:active{transform:scale(0.98);}
.btn-primary:disabled{opacity:0.5;cursor:default;}
.err-msg{
  color:var(--error);
  font-size:0.88rem;
  min-height:1.2em;
}
.hint{color:var(--muted);font-size:0.82rem;}
.whoami{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:0.85rem;
  color:var(--muted);
  margin-bottom:22px;
}
.whoami b{color:var(--text);}
.whoami button{
  background:transparent;
  border:1px solid var(--border);
  color:var(--muted);
  border-radius:6px;
  padding:4px 9px;
  font-size:0.75rem;
}
.whoami button:hover{border-color:var(--blue);color:var(--text);}

/* Test list */
.test-list{display:flex;flex-direction:column;gap:10px;}
.test-item{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  background:var(--panel2);
  border:1px solid var(--border);
  border-radius:10px;
  padding:16px 16px;
  text-decoration:none;
  color:var(--text);
  transition:border-color .15s;
}
.test-item:hover{border-color:var(--blue);}
.test-item h3{font-size:1.02rem;font-weight:700;}
.test-item p{margin:4px 0 0;color:var(--muted);font-size:0.85rem;}
.test-item .go{
  font-family:'IBM Plex Mono',monospace;
  color:var(--accent);
  font-size:0.8rem;
  flex:none;
}
.empty{color:var(--muted);font-size:0.9rem;}

footer.note{
  text-align:center;
  color:var(--border);
  font-size:0.7rem;
  margin-top:24px;
  letter-spacing:0.03em;
}

/* Quiz */
.ports{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:10px;
  padding:12px;
  margin-bottom:22px;
}
.port{
  flex:1 1 0;
  min-width:26px;
  height:30px;
  border-radius:4px;
  background:var(--panel2);
  border:1px solid var(--border);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:0.68rem;
  color:var(--muted);
  position:relative;
  cursor:pointer;
  transition:background .25s,border-color .25s,color .25s;
}
.port::before{
  content:'';
  position:absolute;
  top:3px;left:50%;
  transform:translateX(-50%);
  width:3px;height:3px;
  border-radius:50%;
  background:var(--muted);
  opacity:0.5;
}
.port.current{border-color:var(--blue);color:var(--blue);}
.port.correct{background:rgba(87,204,138,0.18);border-color:var(--success);color:var(--success);}
.port.correct::before{background:var(--success);opacity:1;box-shadow:0 0 4px var(--success);}
.port.wrong{background:rgba(232,99,107,0.18);border-color:var(--error);color:var(--error);}
.port.wrong::before{background:var(--error);opacity:1;box-shadow:0 0 4px var(--error);}
.port.answered{background:rgba(91,155,213,0.16);border-color:var(--blue);color:var(--blue);}
.port.answered::before{background:var(--blue);opacity:1;box-shadow:0 0 4px var(--blue);}

.qmeta{
  display:flex;
  justify-content:space-between;
  color:var(--muted);
  font-size:0.78rem;
  letter-spacing:0.05em;
  text-transform:uppercase;
  margin-bottom:12px;
}
.qtext{font-size:1.2rem;font-weight:600;line-height:1.4;margin-bottom:20px;}

.opts{display:flex;flex-direction:column;gap:10px;}
.opt{
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  text-align:left;
  background:var(--panel2);
  border:1px solid var(--border);
  color:var(--text);
  border-radius:9px;
  padding:12px 14px;
  font-family:'Karla',sans-serif;
  font-size:0.98rem;
  cursor:pointer;
  transition:border-color .15s,background .15s,transform .1s;
}
.opt:hover:not(:disabled){border-color:var(--blue);}
.opt:active:not(:disabled){transform:scale(0.995);}
.opt .tag-letter{
  font-family:'IBM Plex Mono',monospace;
  font-size:0.78rem;
  color:var(--muted);
  border:1px solid var(--border);
  border-radius:4px;
  width:24px;height:24px;
  display:flex;align-items:center;justify-content:center;
  flex:none;
}
.opt.chosen{border-color:var(--blue);background:rgba(91,155,213,0.12);}
.opt.right{border-color:var(--success);background:rgba(87,204,138,0.14);}
.opt.right .tag-letter{border-color:var(--success);color:var(--success);}
.opt.miss{border-color:var(--error);background:rgba(232,99,107,0.14);}
.opt.miss .tag-letter{border-color:var(--error);color:var(--error);}
.opt.correct-hint{border-color:var(--blue);background:transparent;border-style:dashed;}
.opt.correct-hint .tag-letter{border-color:var(--blue);color:var(--blue);}
.opt-hint{margin-left:auto;font-size:0.72rem;letter-spacing:0.03em;flex:none;}
.opt.right .opt-hint{color:var(--success);}
.opt.correct-hint .opt-hint{color:var(--blue);}
.opt.miss .opt-hint{color:var(--error);}
.opt:disabled{cursor:default;}

.qimg{
  display:flex;
  justify-content:center;
  background:var(--panel2);
  border:1px solid var(--border);
  border-radius:10px;
  padding:20px;
  margin-bottom:18px;
}
.qimg img{max-width:220px;width:100%;height:auto;display:block;}

.combo-wrap{position:relative;}
.combo-input{
  width:100%;
  background:var(--panel2);
  border:1px solid var(--border);
  color:var(--text);
  border-radius:9px;
  padding:12px 14px;
  font-family:'Karla',sans-serif;
  font-size:0.98rem;
}
.combo-input:focus{outline:none;border-color:var(--blue);}
.combo-input.chosen{border-color:var(--blue);background:rgba(91,155,213,0.12);}
.combo-input.right{border-color:var(--success);background:rgba(87,204,138,0.14);}
.combo-input.miss{border-color:var(--error);background:rgba(232,99,107,0.14);}
.combo-list{
  position:absolute;
  top:100%;left:0;right:0;
  margin-top:6px;
  background:var(--panel2);
  border:1px solid var(--border);
  border-radius:9px;
  max-height:240px;
  overflow-y:auto;
  z-index:10;
  box-shadow:0 8px 24px rgba(0,0,0,0.35);
}
.combo-item{
  padding:10px 14px;
  cursor:pointer;
  font-size:0.95rem;
}
.combo-item:hover{background:rgba(91,155,213,0.15);}
.combo-feedback{margin-top:10px;font-size:0.82rem;min-height:1.2em;}

.foot{display:flex;align-items:center;justify-content:space-between;margin-top:22px;gap:12px;}
.score-readout{font-size:0.85rem;color:var(--muted);letter-spacing:0.03em;}
.score-readout b{color:var(--text);}
button.next{
  background:var(--accent);
  color:#20130a;
  border:none;
  border-radius:8px;
  padding:11px 20px;
  font-weight:600;
  font-size:0.85rem;
  letter-spacing:0.04em;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s,transform .1s;
}
button.next.show{opacity:1;pointer-events:auto;}
button.next:active{transform:scale(0.97);}

button.prev{
  background:transparent;
  color:var(--muted);
  border:1px solid var(--border);
  border-radius:8px;
  padding:11px 16px;
  font-weight:600;
  font-size:0.85rem;
  letter-spacing:0.04em;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s,border-color .15s,color .15s;
}
button.prev.show{opacity:1;pointer-events:auto;}
button.prev:hover{border-color:var(--blue);color:var(--text);}
button.prev:active{transform:scale(0.97);}

.result{display:none;text-align:center;}
.result.show{display:block;}
.result .big{
  font-family:'IBM Plex Mono',monospace;
  font-size:3.2rem;
  font-weight:600;
  margin:6px 0 4px;
  letter-spacing:-0.01em;
}
.result .big span{color:var(--muted);font-size:1.6rem;}
.verdict{font-size:1.05rem;font-weight:600;margin-bottom:4px;}
.verdict.good{color:var(--success);}
.verdict.mid{color:var(--accent);}
.verdict.bad{color:var(--error);}
.result .desc{color:var(--muted);font-size:0.92rem;margin-bottom:20px;}
.result-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;}
.retry, .back-link{
  background:transparent;
  border:1px solid var(--border);
  color:var(--text);
  border-radius:8px;
  padding:10px 18px;
  font-size:0.85rem;
  text-decoration:none;
  display:inline-block;
}
.retry:hover, .back-link:hover{border-color:var(--blue);}

.leaderboard{margin-top:26px;text-align:left;}
.leaderboard h3{font-size:0.85rem;text-transform:uppercase;letter-spacing:0.06em;color:var(--muted);margin-bottom:10px;}
.lb-row{
  display:flex;
  justify-content:space-between;
  padding:8px 10px;
  border-bottom:1px solid var(--border);
  font-size:0.88rem;
  text-decoration:none;
  color:var(--text);
  transition:background .15s;
}
.lb-row:last-child{border-bottom:none;}
.lb-row:hover{background:rgba(91,155,213,0.08);border-radius:6px;}
.lb-row .lb-name{font-weight:600;}
.lb-row.me{background:rgba(91,155,213,0.1);border-radius:6px;}
.lb-score{font-family:'IBM Plex Mono',monospace;color:var(--muted);}

.quiz-body{display:block;}
.quiz-body.hide{display:none;}

/* Admin */
.admin-table{width:100%;border-collapse:collapse;font-size:0.88rem;min-width:480px;}
.admin-table th{
  text-align:left;
  font-family:'IBM Plex Mono',monospace;
  font-size:0.72rem;
  letter-spacing:0.05em;
  text-transform:uppercase;
  color:var(--muted);
  padding:8px 10px;
  border-bottom:1px solid var(--border);
}
.admin-table td{padding:9px 10px;border-bottom:1px solid var(--border);}
.admin-table tr:last-child td{border-bottom:none;}

.mode-toggle{display:flex;gap:6px;flex:none;}
.mode-btn{
  background:var(--panel);
  border:1px solid var(--border);
  color:var(--muted);
  border-radius:7px;
  padding:8px 12px;
  font-family:'IBM Plex Mono',monospace;
  font-size:0.76rem;
}
.mode-btn.active{border-color:var(--accent);color:var(--accent);background:rgba(239,133,68,0.1);}
.mode-btn:hover{border-color:var(--blue);}

.test-item-off{opacity:0.55;}
.test-item-off h3{color:var(--muted);}

.switch{display:flex;align-items:center;gap:8px;cursor:pointer;flex:none;}
.switch input{position:absolute;opacity:0;width:0;height:0;}
.switch-track{
  position:relative;
  width:38px;height:22px;
  background:var(--panel2);
  border:1px solid var(--border);
  border-radius:999px;
  transition:background .15s,border-color .15s;
  flex:none;
}
.switch-thumb{
  position:absolute;
  top:2px;left:2px;
  width:16px;height:16px;
  border-radius:50%;
  background:var(--muted);
  transition:transform .15s,background .15s;
}
.switch input:checked + .switch-track{background:rgba(87,204,138,0.18);border-color:var(--success);}
.switch input:checked + .switch-track .switch-thumb{transform:translateX(16px);background:var(--success);}
.switch-label{font-size:0.72rem;letter-spacing:0.04em;color:var(--muted);min-width:64px;}
.switch input:checked ~ .switch-label{color:var(--success);}

.test-item .exam-badge{
  font-family:'IBM Plex Mono',monospace;
  font-size:0.68rem;
  color:var(--error);
  border:1px solid var(--error);
  background:rgba(232,99,107,0.1);
  padding:2px 6px;
  border-radius:4px;
  margin-left:8px;
  letter-spacing:0.04em;
}

/* Login / registration */
.auth-tabs{display:flex;gap:6px;margin-bottom:20px;border-bottom:1px solid var(--border);}
.auth-tab{
  background:transparent;
  border:none;
  border-bottom:2px solid transparent;
  color:var(--muted);
  padding:8px 12px;
  margin-bottom:-1px;
  font-size:0.85rem;
}
.auth-tab.active{color:var(--text);border-bottom-color:var(--accent);}
.field{display:flex;flex-direction:column;gap:6px;flex:1;min-width:0;}
.field-row{display:flex;gap:10px;flex-wrap:wrap;}
.field-row .field{min-width:160px;}
.btn-block{height:44px;width:100%;}