/* Material de Estudos — visual inspirado no Hyperspace (HTML5 UP)
   Design responsivo, acessível e sem dependências externas. */
:root{
  --bg:#151521;
  --bg2:#1d1d2b;
  --panel:rgba(255,255,255,.065);
  --panel-strong:rgba(255,255,255,.10);
  --text:#f7f7fb;
  --muted:#b7b7c8;
  --accent:#7c5cff;
  --accent2:#5d8cff;
  --line:rgba(255,255,255,.12);
  --shadow:0 18px 50px rgba(0,0,0,.28);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  color:var(--text);
  background:
    radial-gradient(circle at 85% 10%,rgba(124,92,255,.20),transparent 30rem),
    radial-gradient(circle at 15% 80%,rgba(93,140,255,.13),transparent 28rem),
    linear-gradient(135deg,#101018 0%,#171725 48%,#101018 100%);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.6;
}
body:before{
  content:"";position:fixed;inset:0;pointer-events:none;opacity:.035;
  background-image:linear-gradient(rgba(255,255,255,.8) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.8) 1px,transparent 1px);
  background-size:40px 40px;mask-image:linear-gradient(to bottom,black,transparent 75%);
}
a{color:inherit}
#sidebar{
  position:fixed;z-index:20;left:0;top:0;width:260px;height:100vh;
  padding:34px 24px;background:rgba(12,12,19,.72);border-right:1px solid var(--line);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
}
.brand{display:flex;gap:12px;align-items:center;text-decoration:none;margin-bottom:42px}
.brand-mark{
  width:42px;height:42px;border-radius:13px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 10px 30px rgba(124,92,255,.28);
  font-weight:900
}
.brand strong{font-size:1rem;letter-spacing:.04em}.brand span{display:block;color:var(--muted);font-size:.72rem}
.nav{display:flex;flex-direction:column;gap:8px}
.nav a{
  text-decoration:none;color:#d7d7e4;padding:12px 14px;border-radius:10px;
  transition:.2s ease;display:block
}
.nav a:hover,.nav a.active{background:var(--panel-strong);color:#fff;transform:translateX(3px)}
.sidebar-foot{position:absolute;bottom:26px;left:24px;right:24px;color:#858599;font-size:.72rem}
.menu-toggle{display:none}
#wrapper{margin-left:260px;min-height:100vh}
section.wrapper{padding:88px clamp(24px,5vw,76px)}
.hero{min-height:72vh;display:flex;align-items:center;position:relative;overflow:hidden}
.hero .inner{max-width:1050px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;color:#dcd9ff;font-size:.78rem;
  text-transform:uppercase;letter-spacing:.16em;font-weight:800;margin-bottom:18px
}
.eyebrow:before{content:"";width:28px;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent2))}
h1,h2,h3{line-height:1.12;margin:0 0 18px}
h1{font-size:clamp(2.7rem,7vw,6.2rem);letter-spacing:-.055em}
h2{font-size:clamp(2rem,4vw,3.1rem);letter-spacing:-.035em}
h3{font-size:1.15rem}
.lead{font-size:clamp(1rem,1.6vw,1.25rem);color:var(--muted);max-width:760px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.button{
  appearance:none;border:1px solid var(--line);border-radius:999px;
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:46px;padding:10px 18px;text-decoration:none;font-weight:750;
  background:var(--panel);color:#fff;transition:.2s ease;cursor:pointer
}
.button:hover{transform:translateY(-2px);background:var(--panel-strong);border-color:rgba(255,255,255,.24)}
.button.primary{border:0;background:linear-gradient(135deg,var(--accent),var(--accent2));box-shadow:0 12px 30px rgba(93,140,255,.18)}
.button.danger{background:rgba(255,91,121,.12);border-color:rgba(255,91,121,.3)}
.section-dark{background:rgba(0,0,0,.10);border-top:1px solid rgba(255,255,255,.05);border-bottom:1px solid rgba(255,255,255,.05)}
.grid{display:grid;gap:18px}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{
  background:linear-gradient(145deg,rgba(255,255,255,.085),rgba(255,255,255,.035));
  border:1px solid var(--line);border-radius:var(--radius);padding:25px;
  box-shadow:var(--shadow);transition:.25s ease
}
.card:hover{transform:translateY(-5px);border-color:rgba(124,92,255,.4)}
.card-icon{
  width:50px;height:50px;border-radius:14px;display:grid;place-items:center;
  background:rgba(124,92,255,.16);font-size:1.35rem;margin-bottom:18px
}
.card p{color:var(--muted);margin:0 0 20px}
.stat{font-size:2rem;font-weight:850;letter-spacing:-.04em}
.muted{color:var(--muted)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:30px}
.section-head p{max-width:650px;color:var(--muted);margin:0}
.search-wrap{position:relative;margin:10px 0 28px}
.search{
  width:100%;padding:16px 18px 16px 48px;border-radius:14px;border:1px solid var(--line);
  background:rgba(0,0,0,.22);color:#fff;outline:none;font:inherit
}
.search:focus{border-color:rgba(124,92,255,.75);box-shadow:0 0 0 3px rgba(124,92,255,.12)}
.search-icon{position:absolute;left:17px;top:50%;transform:translateY(-50%);opacity:.65}
.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.course{
  min-height:175px;display:flex;flex-direction:column;justify-content:space-between;
  background:linear-gradient(145deg,rgba(255,255,255,.075),rgba(255,255,255,.025));
  border:1px solid var(--line);border-radius:16px;padding:20px;text-decoration:none;
  transition:.22s ease
}
.course:hover{transform:translateY(-4px);border-color:rgba(124,92,255,.55);background:rgba(124,92,255,.08)}
.course small{color:#8f8fa5;text-transform:uppercase;letter-spacing:.12em;font-weight:800}
.course strong{font-size:1.03rem;line-height:1.35;margin:10px 0}
.course .open{font-size:.84rem;color:#c8c5ff}
.resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:24px}
.resource{
  text-decoration:none;display:flex;align-items:center;gap:14px;padding:18px;
  border:1px solid var(--line);border-radius:14px;background:var(--panel);transition:.2s ease
}
.resource:hover{transform:translateY(-3px);border-color:rgba(124,92,255,.55);background:var(--panel-strong)}
.resource .ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;background:rgba(124,92,255,.15);flex:0 0 auto}
.resource b{display:block}.resource span{font-size:.78rem;color:var(--muted)}
.course-hero{min-height:48vh}
.course-hero h1{font-size:clamp(2.3rem,5vw,4.8rem);max-width:950px}
.breadcrumb{display:flex;gap:8px;flex-wrap:wrap;color:#9696aa;font-size:.85rem;margin-bottom:28px}
.breadcrumb a{color:#d5d2ff;text-decoration:none}
.notice{
  padding:16px 18px;border:1px solid rgba(124,92,255,.25);background:rgba(124,92,255,.08);
  border-radius:14px;color:#dcd9ee;margin-top:20px
}
.footer{padding:35px clamp(24px,5vw,76px);color:#77778c;border-top:1px solid var(--line);font-size:.82rem}
.empty{padding:35px;text-align:center;color:var(--muted);display:none}
.back-top{
  position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  display:grid;place-items:center;background:rgba(20,20,30,.82);border:1px solid var(--line);
  color:#fff;text-decoration:none;opacity:0;pointer-events:none;transition:.2s;z-index:15
}
.back-top.show{opacity:1;pointer-events:auto}
@media(max-width:1100px){
  #sidebar{width:220px}.grid.three,.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  #wrapper{margin-left:220px}
}
@media(max-width:760px){
  #sidebar{
    width:100%;height:auto;position:sticky;top:0;padding:12px 16px;display:flex;align-items:center;
    justify-content:space-between;z-index:50
  }
  .brand{margin:0}.brand-mark{width:38px;height:38px}.sidebar-foot{display:none}
  .menu-toggle{display:block;border:1px solid var(--line);background:var(--panel);color:#fff;border-radius:10px;padding:9px 11px;font-size:1.1rem}
  .nav{
    display:none;position:absolute;top:64px;left:0;right:0;padding:10px 16px 16px;
    background:rgba(12,12,19,.96);border-bottom:1px solid var(--line)
  }
  .nav.open{display:flex}
  #wrapper{margin-left:0}
  section.wrapper{padding:65px 18px}
  .hero{min-height:68vh}
  .grid.three,.grid.four,.course-grid,.resource-grid{grid-template-columns:1fr}
  .section-head{display:block}.section-head p{margin-top:10px}
  h1{font-size:clamp(2.6rem,14vw,4.3rem)}
  .course-hero{min-height:50vh}
}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important}
}