/* SolarSystem.com — shared design system. One file, cached on every page. */
:root{
  --bg:#050913;--bg2:#0a1224;--panel:rgba(14,24,46,.82);--line:rgba(0,229,255,.18);
  --cyan:#00e5ff;--amber:#ffb627;--red:#ff5c3a;--green:#3dffa2;
  --text:#e6f0ff;--muted:#8fa3c4;--r:14px;--max:1200px;
  --f-head:Orbitron,system-ui,sans-serif;--f-body:Rajdhani,system-ui,sans-serif;--f-mono:"Space Mono",ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg) radial-gradient(ellipse at top,#0d1a38 0,var(--bg) 60%) fixed;color:var(--text);font-family:var(--f-body);font-size:18px;line-height:1.55;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{font-family:var(--f-head);line-height:1.15;letter-spacing:.02em}
h1{font-size:clamp(32px,5vw,56px);font-weight:900}
h2{font-size:clamp(22px,3.2vw,32px);margin-bottom:6px}
h3{font-size:17px}
p{margin-bottom:12px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 18px}
.kicker{display:block;font-family:var(--f-mono);font-size:11px;letter-spacing:.2em;color:var(--cyan);text-transform:uppercase;margin-bottom:8px}
.muted{color:var(--muted)}
.mono{font-family:var(--f-mono)}
.sec{padding:56px 0}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.sec-head a{font-family:var(--f-mono);font-size:12px;color:var(--cyan);letter-spacing:.1em}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r)}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:999px;font-family:var(--f-head);font-size:12px;font-weight:700;letter-spacing:.08em;border:1px solid var(--cyan);color:var(--cyan);cursor:pointer;background:none;transition:.2s}
.btn:hover{background:rgba(0,229,255,.1)}
.btn.solid{background:var(--cyan);color:#001018}
.btn.solid:hover{box-shadow:0 0 24px rgba(0,229,255,.5)}
.btn.amber{border-color:var(--amber);color:var(--amber)}
.tag{display:inline-block;font-family:var(--f-mono);font-size:10px;letter-spacing:.12em;padding:3px 8px;border-radius:4px;background:rgba(0,229,255,.1);color:var(--cyan)}
.tag.amber{background:rgba(255,182,39,.12);color:var(--amber)}
.tag.green{background:rgba(61,255,162,.1);color:var(--green)}
.skeleton{color:var(--muted);font-family:var(--f-mono);font-size:12px;padding:18px}

/* ---------- universal header ---------- */
.ss-ticker{background:rgba(0,229,255,.05);border-bottom:1px solid var(--line);font-family:var(--f-mono);font-size:10px;letter-spacing:.14em;color:var(--muted);padding:6px 0;white-space:nowrap;overflow:hidden}
.ss-ticker b{color:var(--green);font-weight:400}
.ss-nav{position:sticky;top:0;z-index:100;background:rgba(5,9,19,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.ss-nav .wrap{display:flex;align-items:center;gap:20px;height:62px}
.ss-logo{font-family:var(--f-head);font-weight:900;font-size:17px;white-space:nowrap;display:flex;align-items:center;gap:9px}
.ss-logo i{width:22px;height:22px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#ffe08a,#ffb627 45%,#c45a00);box-shadow:0 0 14px rgba(255,182,39,.6);display:inline-block}
.ss-logo span{color:var(--amber)}
.ss-links{display:flex;gap:4px;flex:1;justify-content:center}
.ss-links a{padding:7px 11px;border-radius:8px;font-weight:600;font-size:15px;color:var(--muted);white-space:nowrap}
.ss-links a:hover,.ss-links a.on{color:var(--text);background:rgba(0,229,255,.08)}
.ss-links a.on{color:var(--cyan)}
.ss-links a.ext{color:var(--amber)}
.ss-burger{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--cyan);border-radius:8px;padding:5px 10px;font-size:20px;cursor:pointer}
.ss-worlds{border-bottom:1px solid var(--line);background:rgba(10,18,36,.7);overflow-x:auto;scrollbar-width:none}
.ss-worlds::-webkit-scrollbar{display:none}
.ss-worlds .wrap{display:flex;gap:4px;padding-top:6px;padding-bottom:6px}
.ss-worlds a{font-size:14px;font-weight:600;color:var(--muted);padding:4px 10px;border-radius:999px;white-space:nowrap}
.ss-worlds a:hover,.ss-worlds a.on{color:var(--text);background:rgba(255,255,255,.06)}
.ss-worlds a.on{color:var(--amber)}

/* ---------- universal footer ---------- */
.ss-foot{border-top:1px solid var(--line);margin-top:40px;padding:44px 0 26px;background:rgba(5,9,19,.6)}
.ss-foot .cols{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:24px}
.ss-foot h4{font-family:var(--f-mono);font-size:11px;letter-spacing:.18em;color:var(--cyan);margin-bottom:12px;font-weight:400}
.ss-foot ul{list-style:none}
.ss-foot li{margin-bottom:7px;font-size:15px}
.ss-foot li a{color:var(--muted)}
.ss-foot li a:hover{color:var(--text)}
.ss-foot .fine{margin-top:30px;padding-top:18px;border-top:1px solid rgba(255,255,255,.06);font-family:var(--f-mono);font-size:10px;color:var(--muted);letter-spacing:.08em;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.ss-news-form{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;margin-top:12px;max-width:340px}
.ss-news-form input{flex:1;min-width:0;background:none;border:0;color:var(--text);padding:10px 14px;font-family:var(--f-body);font-size:15px;outline:none}
.ss-news-form button{border:0;background:var(--cyan);color:#001018;font-family:var(--f-head);font-weight:700;font-size:10px;padding:0 14px;cursor:pointer;letter-spacing:.08em}

/* ---------- page hero (topic pages) ---------- */
.crumbs{font-family:var(--f-mono);font-size:11px;color:var(--muted);letter-spacing:.1em;padding:18px 0 0}
.crumbs a{color:var(--cyan)}
.topic-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center;padding:30px 0 40px}
.topic-hero .lead{font-size:20px;color:var(--muted);max-width:620px;margin:14px 0 22px}
.planet-orb{aspect-ratio:1;max-width:380px;margin:0 auto;width:100%;border-radius:50%;box-shadow:inset -40px -30px 80px rgba(0,0,0,.75),0 0 80px var(--glow,rgba(255,92,58,.35))}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:6px}
.stat{padding:12px 14px}
.stat small{display:block;font-family:var(--f-mono);font-size:10px;letter-spacing:.14em;color:var(--muted)}
.stat b{font-family:var(--f-head);font-size:16px;color:var(--amber)}

/* ---------- layout: article + sidebar ---------- */
.layout{display:grid;grid-template-columns:1fr 340px;gap:28px;align-items:start}
.article h2{margin:34px 0 10px}
.article h2:first-child{margin-top:0}
.article ul{margin:0 0 14px 22px}
.article li{margin-bottom:6px}
.fact{padding:16px 18px;border-left:3px solid var(--amber);margin:18px 0}
.sidebar{position:sticky;top:80px;display:flex;flex-direction:column;gap:16px}

/* ---------- modules ---------- */
.m-book{display:flex;gap:16px;padding:18px}
.cover{flex-shrink:0;width:96px;aspect-ratio:2/3;border-radius:3px 8px 8px 3px;padding:9px 8px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:-4px 6px 16px rgba(0,0,0,.6),inset 4px 0 0 rgba(0,0,0,.25)}
.cover .s{font-family:var(--f-mono);font-size:6px;letter-spacing:.12em;opacity:.85}
.cover .t{font-family:var(--f-head);font-weight:900;font-size:10px;line-height:1.15}
.cover .n{font-family:var(--f-head);font-weight:900;font-size:20px;opacity:.35}
.m-book h3{margin:6px 0}
.m-book p{font-size:15px;color:var(--muted);margin-bottom:10px}
.shelf{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.shelf .item{text-align:center}
.shelf .cover{width:100%;padding:14px 11px;transition:.25s}
.shelf .cover .s{font-size:8px}.shelf .cover .t{font-size:14px}.shelf .cover .n{font-size:28px}
.shelf .item:hover .cover{transform:translateY(-6px) rotate(-1deg)}
.shelf .item p{font-size:14px;color:var(--muted);margin:8px 0 0}
.m-course{padding:18px;border-color:rgba(255,182,39,.35)}
.m-course .orion{display:flex;gap:10px;align-items:center;margin-bottom:10px}
.m-course .orion i{width:34px;height:34px;border-radius:50%;background:radial-gradient(circle at 50% 45%,#7ff4ff,#00a8c2 40%,#032433 75%);box-shadow:0 0 14px var(--cyan);flex-shrink:0}
.m-course p{font-size:15px;color:var(--muted);margin-bottom:12px}
.m-list{padding:18px}
.m-list h3{margin-bottom:12px;display:flex;justify-content:space-between;align-items:center}
.m-list .row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-top:1px solid rgba(255,255,255,.06);font-size:15px}
.m-list .row small{display:block;color:var(--muted);font-size:13px}
.m-list .more{display:block;margin-top:12px;font-family:var(--f-mono);font-size:11px;color:var(--cyan);letter-spacing:.08em}
.m-list a.row.prod:hover{color:var(--cyan)}
.shop-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.shop-tabs button{padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:none;color:var(--muted);font-family:var(--f-body);font-weight:700;font-size:15px;cursor:pointer}
.shop-tabs button.on{background:var(--amber);border-color:var(--amber);color:#1a1000}
.shop-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.pcard{padding:18px;display:flex;flex-direction:column;gap:8px;transition:.2s}
.pcard:hover{border-color:var(--amber);transform:translateY(-3px)}
.pcard .tag{align-self:flex-start}
.pcard b{font-family:var(--f-head);font-size:14px;line-height:1.3}
.pcard p{color:var(--muted);font-size:15px;margin:0 0 6px}
.m-sponsor{padding:16px;text-align:center;border-style:dashed}
.m-sponsor small{font-family:var(--f-mono);font-size:10px;letter-spacing:.16em;color:var(--muted)}
.m-sponsor b{display:block;font-family:var(--f-head);margin:6px 0;font-size:15px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
.card{padding:14px;transition:.2s}
.card:hover{border-color:var(--cyan);transform:translateY(-3px)}
.card .e{font-size:28px}
.card b{display:block;font-family:var(--f-head);font-size:13px;margin-top:6px}
.card small{color:var(--muted);font-size:13px}

/* news */
.news{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.news a{display:flex;flex-direction:column;overflow:hidden;transition:.2s}
.news a:hover{border-color:var(--cyan)}
.news .img{aspect-ratio:16/9;background:#0d1a33 center/cover}
.news .body{padding:14px 16px 16px}
.news .body h3{font-family:var(--f-body);font-size:17px;font-weight:700;line-height:1.3;margin:6px 0}
.news .src{font-family:var(--f-mono);font-size:10px;color:var(--muted);letter-spacing:.1em}

/* homepage briefing */
.brief{display:grid;grid-template-columns:1.3fr 1fr;gap:16px}
.apod{overflow:hidden;display:flex;flex-direction:column}
.apod .img{aspect-ratio:16/10;background:#0d1a33 center/cover}
.apod .body{padding:16px 18px}
.brief-side{display:grid;gap:16px}
.live{padding:18px}
.live .big{font-family:var(--f-head);font-size:22px;color:var(--amber);margin:4px 0}
.count{display:flex;gap:10px;margin-top:8px}
.count div{text-align:center;flex:1;padding:8px 0;background:rgba(0,229,255,.06);border-radius:8px}
.count b{display:block;font-family:var(--f-head);font-size:22px}
.count small{font-family:var(--f-mono);font-size:9px;color:var(--muted)}
.quiz button{display:block;width:100%;text-align:left;margin-top:8px;padding:9px 12px;border-radius:8px;border:1px solid var(--line);background:none;color:var(--text);font-family:var(--f-body);font-size:15px;cursor:pointer}
.quiz button:hover{border-color:var(--cyan)}
.quiz button.right{border-color:var(--green);background:rgba(61,255,162,.1)}
.quiz button.wrong{border-color:var(--red);background:rgba(255,92,58,.1)}
.learn-band{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center;padding:34px}
.dot-live{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green);margin-right:6px;animation:blink 1.6s infinite}
@keyframes blink{50%{opacity:.3}}

/* ---------- responsive ---------- */
@media(max-width:1020px){
  .ss-links{display:none;position:absolute;top:62px;left:0;right:0;flex-direction:column;background:rgba(5,9,19,.98);padding:14px;border-bottom:1px solid var(--line)}
  .ss-links.open{display:flex}
  .ss-burger{display:block}
  .layout,.topic-hero,.brief,.learn-band{grid-template-columns:1fr}
  .sidebar{position:static}
  .shelf{grid-template-columns:repeat(3,1fr)}
  .news,.g4{grid-template-columns:repeat(2,1fr)}
  .ss-foot .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:620px){
  body{font-size:17px}
  .sec{padding:40px 0}
  .news,.g2,.g3,.g4{grid-template-columns:1fr}
  .shelf{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .planet-orb{max-width:240px}
  .ss-foot .cols{grid-template-columns:1fr}
}
.m-list .row .tag{white-space:nowrap;flex-shrink:0}

/* ---------- ad slots (reserved height prevents page jumping) ---------- */
.ad-box{margin:8px auto;text-align:center}
.ad-box small{display:block;font-family:var(--f-mono);font-size:9px;letter-spacing:.2em;color:var(--muted);margin-bottom:4px;opacity:.7}
.ad-top,.ad-bottom,.ad-infeed{min-height:100px;max-width:970px}
.ad-sidebar{min-height:260px}
.ad-ph{border:1px dashed var(--line);border-radius:10px;display:grid;place-items:center;height:90px;color:var(--muted);font-family:var(--f-mono);font-size:11px;padding:0 12px}
.ad-sidebar .ad-ph{height:250px}
@media(min-width:1021px){.ad-top,.ad-bottom{min-height:110px}}