/* stintaxi.gr — «στην τάξη» */
:root{
  --ink:#15314b; --ink2:#3d5873; --mute:#6c8195; --paper:#fbf8f2; --card:#ffffff; --line:#e8e1d3;
  --board:#1e7a74; --board-d:#145a55; --chalk:#ffcc4d; --coral:#ff6b57; --sky:#e3f1ef; --sun:#fff4d6;
  --r:18px; --shadow:0 2px 0 rgba(21,49,75,.05),0 12px 30px rgba(21,49,75,.08);
  --head:"Comfortaa","Noto Sans",system-ui,sans-serif; --body:"Noto Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.65}
img{max-width:100%;height:auto;display:block}
a{color:var(--board-d)}
h1,h2,h3{font-family:var(--head);line-height:1.2;text-wrap:balance;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(30px,5vw,50px)}
h2{font-size:clamp(25px,3.4vw,36px)}
h3{font-size:20px}
p{margin:0 0 1em}
.wrap{max-width:1160px;margin:0 auto;padding-inline:20px}
.narrow{max-width:760px;margin:0 auto;padding-inline:20px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;z-index:99;background:#fff;padding:8px 12px;border-radius:8px}

/* header */
.top{position:sticky;top:0;z-index:30;background:rgba(251,248,242,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:18px;min-height:68px}
.logo img{height:40px;width:auto}
.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;font-weight:700;font-size:15px;padding:8px 12px;border-radius:10px}
.nav a:hover,.nav a[aria-current]{background:var(--sky);color:var(--board-d)}
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:800;font-size:16px;border-radius:14px;padding:13px 22px;border:2px solid transparent;transition:transform .15s,box-shadow .15s;line-height:1.2}
.btn:hover{transform:translateY(-2px)}
.btn-main{background:var(--coral);color:#fff;box-shadow:0 4px 0 #d9493a}
.btn-board{background:var(--board);color:#fff;box-shadow:0 4px 0 var(--board-d)}
.btn-line{background:#fff;color:var(--ink);border-color:var(--line)}
.top .btn{padding:9px 16px;font-size:14px}
.menu-t{display:none;margin-left:auto;background:none;border:2px solid var(--line);border-radius:10px;padding:6px 10px;font-size:20px;cursor:pointer;color:var(--ink)}
@media(max-width:900px){
  .menu-t{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:68px;background:var(--paper);flex-direction:column;padding:10px 20px 18px;border-bottom:1px solid var(--line)}
  .nav.open{display:flex}
  .top .btn-main{display:none}
}

/* hero */
.hero{padding:56px 0 40px;background:radial-gradient(1200px 400px at 85% -10%,#e3f1ef 0,transparent 60%),radial-gradient(700px 300px at -10% 110%,#fff1cc 0,transparent 60%)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:44px;align-items:center}
.kicker{display:inline-flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--line);border-radius:999px;padding:6px 14px;font-weight:800;font-size:13px;color:var(--board-d);margin-bottom:16px}
.hero h1 em{font-style:normal;color:var(--board)}
.lead{font-size:19px;color:var(--ink2);max-width:58ch}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 14px}
.small{font-size:14px;color:var(--mute)}
.board-frame{position:relative;background:var(--ink);border-radius:22px;padding:14px;box-shadow:0 24px 50px rgba(21,49,75,.25);transform:rotate(-1deg)}
.board-frame img{border-radius:12px}
.board-frame::after{content:"";position:absolute;left:44%;right:44%;bottom:-34px;height:34px;background:var(--ink);border-radius:0 0 6px 6px}
.board-frame::before{content:"";position:absolute;left:30%;right:30%;bottom:-44px;height:12px;background:var(--ink);border-radius:8px}
.tap{position:absolute;right:-10px;bottom:30px;background:var(--chalk);color:var(--ink);font-weight:800;font-size:14px;border-radius:14px;padding:8px 12px;box-shadow:var(--shadow);transform:rotate(3deg)}
@media(max-width:900px){.hero .wrap{grid-template-columns:1fr}.hero{padding-top:34px}.board-frame{margin:0 6px 50px}}

/* strip */
.strip{background:var(--ink);color:#fff}
.strip .wrap{display:flex;gap:26px;flex-wrap:wrap;justify-content:center;padding-block:16px;font-weight:700;font-size:15px}
.strip span{display:flex;align-items:center;gap:8px}

/* sections */
section.s{padding:70px 0}
section.alt{background:#fff;border-block:1px solid var(--line)}
.s-head{max-width:720px;margin:0 0 30px}
.s-head p{color:var(--ink2);font-size:18px}
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(auto-fill,minmax(270px,1fr))}
.g2{grid-template-columns:repeat(auto-fill,minmax(400px,1fr))}
@media(max-width:480px){.g2{grid-template-columns:1fr}}
.card{background:var(--card);border:2px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:6px;min-width:0}
.card h3{margin:4px 0 2px}
.card p{color:var(--ink2);font-size:16px;margin:0}
.card .ico{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:28px;background:var(--sky)}
.card a.more{margin-top:auto;padding-top:10px;font-weight:800;text-decoration:none;color:var(--board-d)}
.card a.more::after{content:" →"}
.tag{display:inline-block;font-size:12px;font-weight:800;color:var(--board-d);background:var(--sky);border-radius:999px;padding:3px 10px;align-self:flex-start}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:44px;align-items:center}
.split.rev>:first-child{order:2}
@media(max-width:900px){.split{grid-template-columns:1fr}.split.rev>:first-child{order:0}}
.shot{border-radius:16px;border:2px solid var(--line);box-shadow:var(--shadow);background:#fff}
.steps{counter-reset:s;list-style:none;margin:0;padding:0;display:grid;gap:14px}
.steps li{counter-increment:s;position:relative;padding-left:58px;min-height:44px}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:42px;height:42px;border-radius:12px;background:var(--chalk);font-family:var(--head);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:20px}
.steps b{display:block}
.modes{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:20px}
.mode{border-radius:16px;padding:16px;background:var(--sun)}
.mode.b{background:var(--sky)}
.mode b{display:block;font-family:var(--head)}
.mode span{font-size:15px;color:var(--ink2)}
.checks{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:8px}
.checks li{padding-left:30px;position:relative}
.checks li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;border-radius:50%;background:var(--board);color:#fff;font-size:13px;font-weight:900;display:flex;align-items:center;justify-content:center;margin-top:3px}

/* faq */
.faq details{background:#fff;border:2px solid var(--line);border-radius:14px;padding:4px 18px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:800;padding:12px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";font-size:22px;color:var(--board)}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--ink2)}

/* final cta */
.final{background:var(--board);color:#fff;border-radius:28px;padding:44px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center}
.final h2{color:#fff}
.final p{color:#d6efeb;margin:0}
@media(max-width:760px){.final{grid-template-columns:1fr;padding:30px}}

/* blog */
.crumbs{font-size:14px;color:var(--mute);margin:26px 0 10px}
.crumbs a{color:var(--mute)}
.post-head{padding:10px 0 20px}
.post-head .meta{color:var(--mute);font-size:15px}
.post{font-size:18px}
.post h2{font-size:27px;margin-top:1.6em}
.post h3{font-size:21px;margin-top:1.3em}
.post ul,.post ol{padding-left:1.3em}
.post li{margin:.3em 0}
.post figure{margin:26px 0}
.post figcaption{font-size:14px;color:var(--mute);margin-top:8px;text-align:center}
.post .tip{background:var(--sun);border-left:5px solid var(--chalk);border-radius:12px;padding:14px 18px;margin:20px 0}
.post .box{background:var(--sky);border-radius:16px;padding:20px 22px;margin:28px 0}
.post .box .btn{margin-top:6px}
.post table{width:100%;border-collapse:collapse;font-size:16px;margin:16px 0}
.post th,.post td{border-bottom:1px solid var(--line);padding:9px 8px;text-align:left;vertical-align:top}
.post th{background:#f4efe4}
.tbl{overflow-x:auto}
.toc{background:#fff;border:2px solid var(--line);border-radius:14px;padding:14px 20px;font-size:16px}
.toc ol{margin:6px 0 0}
.related{margin:40px 0 0}
.author{display:flex;gap:14px;align-items:center;background:#fff;border:2px solid var(--line);border-radius:16px;padding:16px;margin-top:34px;font-size:15px;color:var(--ink2)}
.author img{width:48px;height:48px}
.cover{border-radius:20px;border:2px solid var(--line)}
.blog-list .card img{border-radius:12px;margin:-6px -6px 6px;width:calc(100% + 12px);max-width:none;aspect-ratio:16/10;object-fit:cover}

/* footer */
.foot{margin-top:80px;background:var(--ink);color:#c9d6e2;font-size:15px}
.foot .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;padding-block:44px}
.foot a{color:#fff;text-decoration:none}
.foot a:hover{text-decoration:underline}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.foot h4{color:#fff;font-family:var(--head);margin:0 0 10px;font-size:16px}
.foot .legal{grid-column:1/-1;border-top:1px solid #2b4a68;padding-top:18px;font-size:13px;color:#93a9be}
@media(max-width:760px){.foot .wrap{grid-template-columns:1fr}}
:focus-visible{outline:3px solid var(--coral);outline-offset:2px}
/* Α΄ Δημοτικού — Βοηθός Μαθηματικών */
.hero-sm{padding-top:20px}
.utoc{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 26px}
.utoc a{background:var(--card);border:2px solid var(--line);border-radius:999px;padding:7px 14px;text-decoration:none;color:var(--ink);font-weight:700;font-size:15px}
.utoc a:hover{border-color:var(--board)}
.units{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:20px;align-items:start}
.unit{background:var(--card);border:2px solid var(--line);border-top:6px solid var(--uc);border-radius:var(--r);padding:20px 20px 18px;min-width:0;scroll-margin-top:90px}
.unit header{display:flex;gap:12px;align-items:center;margin-bottom:12px}
.unit .uico{width:50px;height:50px;flex:none;border-radius:14px;background:var(--ub);display:grid;place-items:center;font-size:26px}
.unit .ulab{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--uc)}
.unit h3{margin:0;font-size:20px}
.lessons{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.lessons li{border-top:1px dashed var(--line);padding:8px 0 6px}
.lessons li:first-child{border-top:0}
.lessons .ls{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink);font-weight:700}
.lessons .ls:hover .t{text-decoration:underline}
.lessons .n{width:30px;height:30px;flex:none;border-radius:9px;display:grid;place-items:center;font-size:14px;font-weight:800;font-variant-numeric:tabular-nums}
.lessons .free{font-style:normal;font-size:11px;font-weight:800;background:#fff1c2;color:#7a5600;border-radius:6px;padding:2px 6px;margin-left:6px;vertical-align:2px;letter-spacing:.04em}
.tipx{margin:4px 0 0 40px;font-size:14px;line-height:1.5;color:var(--mute)}
.utest{display:block;margin-top:12px;text-align:center;background:var(--ub);color:var(--ink);border-radius:12px;padding:10px;font-weight:800;text-decoration:none}
.utest:hover{filter:brightness(.97)}
@media(max-width:480px){.tipx{margin-left:0}}