:root{
  --bg:#0e0d1a; --bg2:#16142a; --card:#1c1a33; --card2:#232142;
  --ink:#efedff; --ink-dim:#a9a5cf; --line:#322e5c;
  --acc:#6d5cff; --acc2:#9d8bff; --ok:#34d399; --warn:#fbbf24; --bad:#f87171;
  --radius:16px; --shadow:0 10px 30px rgba(0,0,0,.35);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:radial-gradient(1200px 600px at 80% -10%,#241f4d 0%,var(--bg) 55%);
  color:var(--ink); font-family:var(--font); min-height:100vh; display:flex; flex-direction:column;
}
a{color:var(--acc2); text-decoration:none}
a:hover{text-decoration:underline}
.hidden{display:none !important}

/* ---------- top bar ---------- */
.topbar{
  position:sticky; top:0; z-index:50; display:flex; align-items:center; gap:14px;
  padding:10px 16px; background:rgba(14,13,26,.85); backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex; align-items:center; gap:10px; color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-icon{width:34px; height:34px; border-radius:9px}
.brand-name{font-weight:800; font-size:1.15rem; letter-spacing:.3px}
.brand-tag{font-size:.68rem; color:var(--ink-dim); border:1px solid var(--line); padding:2px 8px; border-radius:99px; white-space:nowrap}
.search{flex:1; display:flex; gap:8px; max-width:640px; margin:0 auto}
.search input{
  flex:1; background:var(--card); border:1px solid var(--line); color:var(--ink);
  border-radius:12px; padding:10px 14px; font-size:.95rem; outline:none; min-width:0;
}
.search input:focus{border-color:var(--acc); box-shadow:0 0 0 3px rgba(109,92,255,.25)}
.search button{
  background:var(--acc); color:#fff; border:none; border-radius:12px; padding:0 16px;
  font-size:1rem; cursor:pointer;
}
.search button:hover{background:#5b46f0}
.top-actions{display:flex; align-items:center; gap:10px}
.pill{font-size:.7rem; padding:4px 10px; border-radius:99px; border:1px solid var(--line); color:var(--ink-dim)}
.pill-ok{color:var(--ok); border-color:rgba(52,211,153,.4)}
.pill-off{color:var(--warn); border-color:rgba(251,191,36,.5)}
.btn-install{
  background:linear-gradient(135deg,var(--acc),#9333ea); color:#fff; border:none;
  border-radius:12px; padding:9px 14px; font-weight:700; cursor:pointer; font-size:.85rem; white-space:nowrap;
}
.btn-install:hover{filter:brightness(1.1)}

/* ---------- dock ---------- */
.dock{
  display:flex; justify-content:center; gap:6px; padding:8px;
  position:sticky; top:57px; z-index:40; background:rgba(14,13,26,.75); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.dock a{
  display:flex; flex-direction:column; align-items:center; gap:2px; color:var(--ink-dim);
  font-size:1.15rem; padding:6px 18px; border-radius:12px; min-width:76px;
}
.dock a span{font-size:.68rem; font-weight:600}
.dock a.active{color:#fff; background:var(--card2)}
.dock a:hover{text-decoration:none; color:#fff}

/* ---------- layout ---------- */
.view{flex:1; width:100%; max-width:960px; margin:0 auto; padding:22px 16px 60px; outline:none}
.view:focus{outline:none}

/* ---------- hero ---------- */
.hero{text-align:center; padding:34px 10px 26px}
.hero h1{font-size:clamp(1.6rem,4.5vw,2.5rem); margin:0 0 10px; line-height:1.15}
.hero h1 em{font-style:normal; background:linear-gradient(90deg,var(--acc2),#e879f9); -webkit-background-clip:text; background-clip:text; color:transparent}
.hero p{color:var(--ink-dim); max-width:640px; margin:0 auto 20px}
.ask-box{display:flex; gap:10px; max-width:640px; margin:0 auto}
.ask-box input{
  flex:1; background:var(--card); border:1px solid var(--line); color:var(--ink);
  border-radius:14px; padding:14px 16px; font-size:1rem; outline:none;
}
.ask-box input:focus{border-color:var(--acc); box-shadow:0 0 0 3px rgba(109,92,255,.25)}
.ask-box button{background:var(--acc); color:#fff; border:none; border-radius:14px; padding:0 22px; font-weight:700; cursor:pointer; font-size:1rem}
.chips{display:flex; flex-wrap:wrap; gap:8px; justify-content:center; margin-top:16px}
.chip{
  background:var(--card); border:1px solid var(--line); color:var(--ink-dim);
  border-radius:99px; padding:7px 14px; font-size:.82rem; cursor:pointer;
}
.chip:hover{color:#fff; border-color:var(--acc)}

/* ---------- subject grid ---------- */
.section-title{font-size:1.25rem; margin:28px 0 14px; display:flex; align-items:center; gap:10px}
.grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(200px,1fr)); gap:12px}
.card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:16px; cursor:pointer; transition:transform .12s, border-color .12s; display:block; color:var(--ink);
}
.card:hover{transform:translateY(-3px); border-color:var(--acc); text-decoration:none}
.card .emoji{font-size:1.7rem}
.card h3{margin:8px 0 4px; font-size:1rem}
.card p{margin:0; color:var(--ink-dim); font-size:.8rem; line-height:1.4}
.card .count{margin-top:8px; font-size:.7rem; color:var(--acc2); font-weight:700}

/* ---------- topic list ---------- */
.topic-item{
  display:block; background:var(--card); border:1px solid var(--line); border-radius:14px;
  padding:14px 16px; margin-bottom:10px; color:var(--ink);
}
.topic-item:hover{border-color:var(--acc); text-decoration:none}
.topic-item h3{margin:0 0 4px; font-size:.98rem}
.topic-item p{margin:0; color:var(--ink-dim); font-size:.82rem}
.mat-pill{display:inline-block; font-size:.68rem; font-weight:700; padding:2px 9px; border-radius:99px; margin-bottom:6px}

/* ---------- article ---------- */
.article{background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow)}
.article-head{display:flex; justify-content:space-between; align-items:flex-start; gap:12px; flex-wrap:wrap}
.article h1{font-size:1.5rem; margin:6px 0 10px; line-height:1.25}
.star-btn{
  background:var(--card2); border:1px solid var(--line); border-radius:12px; font-size:1.2rem;
  padding:8px 12px; cursor:pointer; color:var(--ink-dim);
}
.star-btn.on{color:var(--warn); border-color:rgba(251,191,36,.5)}
.article .body{line-height:1.65; font-size:.97rem}
.article .body h2{font-size:1.12rem; margin:22px 0 8px; color:var(--acc2)}
.article .body h3{font-size:1rem; margin:18px 0 6px}
.article .body p{margin:10px 0}
.article .body ul,.article .body ol{margin:10px 0; padding-left:22px}
.article .body li{margin:5px 0}
.article .body blockquote{
  margin:14px 0; padding:10px 14px; border-left:4px solid var(--acc);
  background:var(--card2); border-radius:0 10px 10px 0; color:var(--ink-dim);
}
.article .body code, .formula{
  font-family:var(--mono); background:#0b0a17; border:1px solid var(--line);
  padding:2px 7px; border-radius:7px; font-size:.88em; color:#c4b5fd;
}
.formula-box{
  background:#0b0a17; border:1px solid var(--acc); border-radius:12px; padding:14px 16px;
  margin:14px 0; font-family:var(--mono); font-size:1rem; color:#e9d5ff; overflow-x:auto; white-space:pre;
}
.exemplo{
  background:linear-gradient(135deg,rgba(52,211,153,.08),rgba(52,211,153,.02));
  border:1px solid rgba(52,211,153,.35); border-radius:12px; padding:14px 16px; margin:14px 0;
}
.exemplo .ex-t{font-weight:800; color:var(--ok); font-size:.8rem; text-transform:uppercase; letter-spacing:.6px; margin-bottom:6px}
.related{display:flex; flex-wrap:wrap; gap:8px; margin-top:20px}
.related a{background:var(--card2); border:1px solid var(--line); padding:7px 13px; border-radius:99px; font-size:.8rem; color:var(--ink)}
.related a:hover{border-color:var(--acc); text-decoration:none}
.back{display:inline-block; margin-bottom:14px; font-size:.85rem; color:var(--ink-dim)}

/* ---------- answers ---------- */
.answer-hero{border:1px solid var(--acc); background:linear-gradient(135deg,rgba(109,92,255,.14),rgba(109,92,255,.03)); border-radius:var(--radius); padding:20px; margin-bottom:18px; box-shadow:var(--shadow)}
.answer-hero .k{font-size:.72rem; font-weight:800; letter-spacing:1px; text-transform:uppercase; color:var(--acc2)}
.answer-hero h2{margin:6px 0 8px; font-size:1.3rem}
.answer-hero .body{line-height:1.6}
.result-item{display:block; background:var(--card); border:1px solid var(--line); border-radius:14px; padding:13px 16px; margin-bottom:10px; color:var(--ink)}
.result-item:hover{border-color:var(--acc); text-decoration:none}
.result-item h3{margin:0 0 4px; font-size:.95rem}
.result-item p{margin:0; color:var(--ink-dim); font-size:.82rem}
.empty{
  text-align:center; padding:40px 20px; background:var(--card); border:1px dashed var(--line);
  border-radius:var(--radius); color:var(--ink-dim);
}
.empty .big{font-size:2.4rem; display:block; margin-bottom:10px}

/* ---------- quiz ---------- */
.quiz-card{background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow)}
.quiz-progress{height:8px; background:var(--card2); border-radius:99px; overflow:hidden; margin-bottom:8px}
.quiz-progress > div{height:100%; background:linear-gradient(90deg,var(--acc),#e879f9); width:0; transition:width .3s}
.quiz-meta{display:flex; justify-content:space-between; font-size:.78rem; color:var(--ink-dim); margin-bottom:14px}
.quiz-q{font-size:1.12rem; font-weight:700; line-height:1.45; margin:0 0 18px}
.opt{
  display:block; width:100%; text-align:left; background:var(--card2); color:var(--ink);
  border:1px solid var(--line); border-radius:12px; padding:13px 15px; margin-bottom:10px;
  font-size:.95rem; cursor:pointer; transition:border-color .12s, background .12s;
}
.opt:hover:not(:disabled){border-color:var(--acc)}
.opt:disabled{cursor:default}
.opt.correct{background:rgba(52,211,153,.15); border-color:var(--ok); color:#d1fae5}
.opt.wrong{background:rgba(248,113,113,.13); border-color:var(--bad); color:#fecaca}
.opt .letter{font-weight:800; color:var(--acc2); margin-right:8px}
.quiz-exp{margin-top:14px; padding:13px 15px; border-radius:12px; background:#0b0a17; border:1px solid var(--line); font-size:.88rem; color:var(--ink-dim); line-height:1.55}
.quiz-exp b{color:var(--ink)}
.quiz-actions{display:flex; gap:10px; margin-top:16px; flex-wrap:wrap}
.btn{background:var(--acc); color:#fff; border:none; border-radius:12px; padding:11px 20px; font-weight:700; cursor:pointer; font-size:.92rem}
.btn:hover{background:#5b46f0}
.btn.ghost{background:var(--card2); color:var(--ink); border:1px solid var(--line)}
.score-ring{text-align:center; padding:30px 0 10px}
.score-ring .num{font-size:3rem; font-weight:900; background:linear-gradient(90deg,var(--acc2),#e879f9); -webkit-background-clip:text; background-clip:text; color:transparent}

/* ---------- misc ---------- */
.foot{border-top:1px solid var(--line); padding:18px 22px 30px; color:var(--ink-dim); font-size:.8rem; text-align:center; line-height:1.6}
.foot-small{font-size:.7rem; opacity:.7}
.toast{
  position:fixed; bottom:22px; left:50%; transform:translateX(-50%); z-index:99;
  background:#0b0a17; border:1px solid var(--acc); color:var(--ink); padding:11px 20px;
  border-radius:99px; font-size:.85rem; box-shadow:var(--shadow);
}
@media (max-width:640px){
  .brand-tag{display:none}
  .topbar{flex-wrap:wrap}
  .search{order:3; flex-basis:100%; max-width:none}
  .dock{top:0; position:fixed; bottom:0; left:0; right:0; top:auto; border-top:1px solid var(--line); border-bottom:none; background:rgba(14,13,26,.95)}
  .view{padding-bottom:110px}
  .foot{padding-bottom:90px}
}
/* Interface editorial • Sábio */
:root{--bg:#0d1018;--bg2:#141823;--card:#171c29;--card2:#202438;--ink:#f0f1f8;--ink-dim:#969db3;--line:#2a3041;--acc:#8c76ff;--acc2:#b1a0ff;--radius:18px}
body{background:radial-gradient(ellipse 75% 30% at 85% 8%,#26203955,transparent),var(--bg);line-height:1.6}
.topbar{background:#0d1018ed;padding:17px 5%;gap:24px;backdrop-filter:blur(20px)}
.brand-icon{width:38px;height:38px}.brand-name{font-size:1.5rem;letter-spacing:-1px}.brand-tag{display:none}.search{max-width:440px}.search input{background:#161a25;border-radius:10px;font-size:.82rem}.search button{background:#26223e;color:#c2b4ff}.pill{font-size:.7rem}.dock{top:73px;background:#0d1018ed;justify-content:flex-start;padding:9px 5%;gap:20px}.dock a{flex-direction:row;gap:9px;padding:8px 14px;min-width:0;font-size:1rem}.dock a span{font-size:.78rem}.dock a.active{background:#29243e;color:#c5b7ff}.view{width:min(1160px,90%);margin:0 auto;padding:0 0 50px;min-height:60vh}.foot{border-top:1px solid var(--line);padding:24px 5% 30px;color:var(--ink-dim);font-size:.75rem;text-align:center;max-width:none;margin-top:auto}.foot p{max-width:850px;margin:8px auto}.eyebrow{font-size:.65rem;font-weight:700;letter-spacing:1.8px;color:#b2a1f7}.hero-new{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;min-height:440px;gap:30px;padding:58px 0 46px}.hero-new h1{font-size:clamp(2.6rem,4.7vw,4.4rem);line-height:1.12;letter-spacing:-2.7px;font-weight:750;margin:25px 0 20px}.hero-new h1 span{color:#b6a5fc}.hero-new p{font-size:.95rem;line-height:1.9;color:var(--ink-dim);margin-bottom:27px}.live-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#9a84f7;margin-right:9px;box-shadow:0 0 12px #9a84f7}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:20px;border-radius:9px;padding:12px 18px;font:600 .82rem var(--font);cursor:pointer;text-decoration:none;border:1px solid transparent}.primary{background:#a28aef;color:#161122;box-shadow:0 4px 20px #8470d11c}.primary:hover{background:#b9a2ff;text-decoration:none}.secondary{color:#ded9f5;background:#202332;border-color:#35364b}.secondary:hover{text-decoration:none;background:#292b40}.hero-proof{display:flex;gap:20px;margin-top:22px;font-size:.7rem;color:#8e96a9}.orbit-art{height:330px;position:relative;display:grid;place-items:center}.orbit{position:absolute;border:1px solid #63538745;width:310px;height:310px;border-radius:50%;transform:rotate(-25deg) scaleY(.72)}.ring-two{width:355px;height:355px;transform:rotate(38deg) scaleY(.76);border-style:dashed;border-color:#63538740}.planet{position:relative;width:175px;height:175px;border-radius:36%;display:grid;place-items:center;font-size:95px;font-weight:700;font-family:Georgia,serif;color:#d3c3ff;transform:rotate(-12deg);background:linear-gradient(140deg,#5f4b89,#27233f 68%);border:1px solid #80709680;box-shadow:inset 8px 10px 35px #ccbaff12,0 0 90px #9371e622}.planet span{position:absolute;right:10px;top:-17px;font:42px var(--font);color:#e4d5ff}.float-tag{position:absolute;background:#1f2132ec;border:1px solid #55506a;border-radius:12px;padding:10px 17px;font-size:.8rem;box-shadow:0 10px 25px #0003}.tag-a{top:38px;left:21px;transform:rotate(-8deg);font-family:Georgia,serif;font-size:1.1rem;color:#c4b0ff}.tag-b{right:0;top:133px;transform:rotate(7deg)}.tag-c{bottom:11px;left:38px;font-size:.7rem;color:#b6adc8}.star{position:absolute;color:#9f8cce;font-size:26px}.star-a{right:46px;top:8px}.star-b{left:0;bottom:70px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:14px;background:#15192480;margin-bottom:51px}.metrics>div,.metrics>a{padding:21px 25px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:2px}.metrics>:last-child{border:0}.metrics b{font-size:1.15rem;color:#e5dff8;font-weight:650}.metrics span{font-size:.68rem;color:var(--ink-dim)}.section-line{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:28px 0 22px}.section-line h2{font-size:1.5rem;letter-spacing:-.5px;margin:7px 0}.section-line>a{font-size:.78rem}.filter-label{display:flex;align-items:center;gap:10px;font-size:.73rem;color:var(--ink-dim)}select,input,textarea{font-family:var(--font)}select{background:#171b27;color:#c5c4d5;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:.75rem;max-width:100%}.subjects-new{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.subject-new{display:flex;align-items:center;gap:13px;background:linear-gradient(120deg,#191e2b,#151924);border:1px solid var(--line);border-radius:12px;padding:20px 15px;transition:transform .15s,border-color .15s;color:var(--ink)}.subject-new:hover{transform:translateY(-3px);border-color:#776095;text-decoration:none}.subject-icon{width:40px;height:42px;flex-shrink:0;display:grid;place-items:center;border-radius:10px;background:color-mix(in srgb,var(--subject) 12%,transparent);font-size:1.2rem}.subject-new h3{font-size:.84rem;margin:0 0 4px;font-weight:600}.subject-new span{font-size:.59rem;color:var(--ink-dim)}.subject-new b{margin-left:auto;font-size:1rem;color:#787990}.daily-strip{margin-top:35px;display:flex;align-items:center;gap:22px;background:linear-gradient(100deg,#29223860,#171a27);border:1px solid #45364f;border-radius:14px;padding:25px}.daily-strip>span{font-size:2rem;color:#b7a2e8}.daily-strip h3{font-size:.96rem;margin:0 0 4px}.daily-strip p{font-size:.77rem;color:var(--ink-dim);margin:0}.daily-strip>a{margin-left:auto;white-space:nowrap}.chips-new{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.chips-new a{padding:10px 16px;border:1px solid var(--line);border-radius:8px;color:#b6b4c9;font-size:.76rem;background:#141824}.chips-new a:hover{border-color:#917bb6;text-decoration:none}.scope-note{font-size:.73rem;color:#969aaf;line-height:1.8;margin:30px 0 0}.page-heading{padding:47px 0 23px;max-width:870px}.page-heading h1{font-size:clamp(1.9rem,3.5vw,2.7rem);line-height:1.2;letter-spacing:-1.2px;margin:15px 0}.page-heading p{color:var(--ink-dim);font-size:.92rem;line-height:1.85}.study-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:20px 0}.study-card{border:1px solid var(--line);padding:24px;background:var(--card);border-radius:14px;color:var(--ink);display:flex;flex-direction:column}.study-card:hover{border-color:#82709e;text-decoration:none}.study-card .eyebrow{font-size:.58rem;letter-spacing:1px}.study-card h3{font-size:1.05rem;line-height:1.5}.study-card p{font-size:.78rem;line-height:1.8;color:var(--ink-dim);display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.card-bottom{font-size:.7rem;color:#b4a4df;border-top:1px solid var(--line);padding-top:15px;margin-top:auto;display:flex;justify-content:space-between}.ask-box{display:flex;gap:12px;background:var(--card);padding:16px;border:1px solid #514461;border-radius:14px}.ask-box input{flex:1;min-width:0;border:none;background:transparent;color:var(--ink);font-size:1rem;padding:10px;outline:none}.notice{padding:16px 20px;border-left:3px solid #a08bcc;background:#242034;color:#bfb8d2;font-size:.78rem;margin:30px 0}.empty-state{padding:60px 25px;text-align:center;border:1px dashed var(--line);border-radius:15px;margin:30px 0;color:var(--ink-dim)}.empty-state>span{font-size:3rem;color:#b5a5df}.empty-state h2,.empty-state h3{color:var(--ink)}.empty-state p{max-width:650px;margin:15px auto}.back-link{display:inline-block;margin-top:27px;font-size:.8rem}.article-new{max-width:850px;margin:auto}.article-new .page-heading{padding-top:25px}.article-tools{display:flex;gap:12px;margin:0 0 32px}.prose{font-size:1rem;line-height:1.95;color:#d7d6e4}.formula-new,.example-new,.pitfall{border:1px solid var(--line);background:#171c29;border-radius:12px;padding:24px;margin:25px 0}.formula-new pre{font: .9rem/1.9 var(--mono);white-space:pre-wrap;color:#c6b4ff}.example-new p{line-height:1.9;color:#c9c7dc;font-size:.95rem}.pitfall{border-color:#655138;background:#3c2c171f}.pitfall b{color:#dfbc7d}.pitfall p{font-size:.86rem;color:#cac0a8}.lab-layout{display:grid;grid-template-columns:270px 1fr;gap:28px}.lab-menu{border:1px solid var(--line);background:var(--card);border-radius:14px;padding:24px;align-self:start;font-size:.8rem}.lab-menu label{display:block;margin-bottom:10px}.lab-menu select{width:100%}.lab-menu p{font-size:.73rem;color:var(--ink-dim)}.lab-menu 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/* Rastreabilidade editorial • v1.2 */
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