:root{
  --bg:#f4f8f5; --card:#fff; --ink:#1f2d2a; --muted:#6b7b76; --brand:#1f9d6b; --brand-d:#157a52;
  --line:#dfe9e4; --good:#e6f7ee; --good-b:#34b27a; --bad:#fdecec; --bad-b:#e25b5b; --half:#fff6e0; --half-b:#e0a82e;
  --radius:14px;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--brand-d)}
header.top{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;align-items:center;justify-content:space-between;padding:.8rem 1.2rem;background:#fff;border-bottom:1px solid var(--line)}
.brand{font-weight:800;font-size:1.25rem;text-decoration:none;color:var(--brand-d)}
nav{display:flex;flex-wrap:wrap;gap:.3rem 1.1rem;align-items:center}
nav a{text-decoration:none;font-weight:600}
nav .who{color:var(--muted)}
main{max-width:860px;margin:0 auto;padding:1.2rem}
footer{max-width:860px;margin:0 auto;padding:1rem 1.2rem 2rem;color:var(--muted);font-size:.85rem;text-align:center}
h1{font-size:1.7rem;margin:.4rem 0 1rem} h2{font-size:1.25rem;margin:.2rem 0 .8rem} h3{font-size:1.05rem}
.muted{color:var(--muted);font-size:.9rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem;margin:0 0 1rem;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.card.narrow{max-width:460px;margin:2rem auto}
.hero{text-align:center;padding:2.5rem 1rem}.hero h1{font-size:2.3rem}.hero p{max-width:620px;margin:1rem auto}
.cta{display:flex;flex-wrap:wrap;gap:.7rem;justify-content:center;margin:1.2rem 0 0}
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:999px;padding:.6rem 1.3rem;font:inherit;font-weight:700;text-decoration:none;cursor:pointer}
.btn:hover{background:var(--brand-d)} .btn:disabled{opacity:.6;cursor:wait}
.btn.big{padding:.85rem 1.8rem;font-size:1.1rem}
.btn.ghost{background:transparent;color:var(--brand-d);border:2px solid var(--brand)}
.btn.danger{background:var(--bad-b)}
button.link{background:none;border:0;color:var(--brand-d);text-decoration:underline;cursor:pointer;font:inherit;padding:0}
label{display:block;margin:.7rem 0;font-weight:600}
input[type=text],input[type=password],input[type=number],input:not([type]),input[type=file],select,textarea{
  display:block;width:100%;margin-top:.3rem;padding:.6rem .7rem;border:1px solid #c7d6cf;border-radius:10px;font:inherit;background:#fff}
.inline input[type=number]{display:inline-block;width:6.5rem;margin:0 .3rem}
textarea{resize:vertical}
.flash{padding:.7rem 1rem;border-radius:10px;margin:0 0 1rem;background:#eaf3ff;border:1px solid #b9d4f5}
.flash.ok{background:var(--good);border-color:var(--good-b)} .flash.err{background:var(--bad);border-color:var(--bad-b)}
.choices{display:flex;flex-wrap:wrap;gap:.6rem}
.chip{padding:.5rem 1rem;border-radius:999px;border:2px solid var(--line);background:#fff;text-decoration:none;font-weight:700;color:var(--ink)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.checklist{display:flex;flex-direction:column;gap:.1rem;margin:.3rem 0 .8rem 1.4rem;max-height:340px;overflow:auto}
.checklist.row{flex-direction:row;flex-wrap:wrap;gap:.3rem 1.4rem;margin-left:0}
.checklist label,label.radio{font-weight:500;margin:.25rem 0} label.radio{font-weight:700}
.checklist input,label.radio input{margin-right:.4rem}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:1rem} @media(max-width:560px){.grid2{grid-template-columns:1fr}}
fieldset{border:1px solid var(--line);border-radius:10px;margin:.8rem 0}
.row{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.7rem 0;border-bottom:1px solid var(--line)}
.row:last-child{border-bottom:0} .actions{display:flex;gap:.5rem;align-items:center}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.8rem;margin-bottom:1rem}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1rem;text-align:center;color:var(--muted);font-size:.9rem}
.stat span{display:block;font-size:1.9rem;font-weight:800;color:var(--brand-d)}
.bar-row{margin:.7rem 0}.bar{position:relative;background:#e7efeb;border-radius:999px;height:22px;overflow:hidden}
.bar span{display:block;height:100%;background:var(--brand)} .bar em{position:absolute;right:.6rem;top:0;font-size:.8rem;font-style:normal;line-height:22px;font-weight:700}
.tbl{width:100%;border-collapse:collapse}.tbl th{text-align:left;color:var(--muted);font-size:.85rem;padding:.4rem}.tbl td{padding:.55rem .4rem;border-top:1px solid var(--line);vertical-align:top}
.pill{display:inline-block;padding:.15rem .7rem;border-radius:999px;font-weight:800}
.pg{background:var(--good);color:#12663f}.py{background:var(--half);color:#8a5d00}.pr{background:var(--bad);color:#a12626}
.pager{display:flex;gap:.4rem}.pager a{padding:.2rem .7rem;border-radius:8px;border:1px solid var(--line);text-decoration:none}.pager a.on{background:var(--brand);color:#fff}
/* Παιχνίδι */
.quizbar{display:flex;justify-content:space-between;gap:1rem;font-size:.95rem}.score{font-weight:800;color:var(--brand-d)}
.progress{height:10px;border-radius:999px;background:#dbe8e1;overflow:hidden;margin:.5rem 0}.progress span{display:block;height:100%;background:var(--brand);transition:width .3s}
.question h2{font-size:1.35rem;line-height:1.4}
.answers{display:grid;gap:.7rem;margin-top:1rem}.answers.two{grid-template-columns:1fr 1fr}
.ans{display:flex;align-items:center;gap:.8rem;text-align:left;width:100%;padding:.9rem 1rem;border:2px solid var(--line);border-radius:12px;background:#fff;font:inherit;font-weight:600;cursor:pointer}
.answers.two .ans{justify-content:center;font-size:1.2rem;padding:1.1rem}
.ans:hover{border-color:var(--brand);background:#f0faf5}.ans:active{transform:scale(.99)}
.letter{display:inline-grid;place-items:center;width:2rem;height:2rem;border-radius:50%;background:#e7f4ed;color:var(--brand-d);font-weight:800;flex:none}
.review{border-radius:12px;padding:1rem;margin-top:1rem;border:2px solid var(--line)}
.review.good{background:var(--good);border-color:var(--good-b)}.review.bad{background:var(--bad);border-color:var(--bad-b)}.review.half{background:var(--half);border-color:var(--half-b)}
.banner{font-size:1.25rem;font-weight:800;margin-bottom:.5rem}
.opts{list-style:none;padding:0;margin:.4rem 0}.opts li{padding:.5rem .8rem;border-radius:10px;border:2px solid transparent;margin:.3rem 0;background:rgba(255,255,255,.6)}
.opts li em{font-style:normal;font-size:.85rem;font-weight:700;margin-left:.4rem}
.opts li.correct{border-color:var(--good-b);background:#fff}.opts li.wrong{border-color:var(--bad-b);background:#fff}
.why{background:#fff;border-radius:10px;padding:.7rem .9rem;margin-top:.7rem}
.source{margin-top:.7rem;font-size:.95rem}.source blockquote{margin:.4rem 0;padding:.3rem .8rem;border-left:4px solid var(--brand);background:#fff;font-style:italic}
.fb{background:#fff;border-radius:10px;padding:.5rem .8rem}
.result{text-align:center}.bigscore{font-size:4rem;font-weight:900;color:var(--brand-d);line-height:1.1}.lead{font-size:1.2rem;font-weight:700}
.steps .card{margin-bottom:.8rem}
code{background:#eef3f0;padding:.1rem .3rem;border-radius:5px}