/* ===== RESET & VARS ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f1117;
  --bg2:#161b27;
  --bg3:#1e2436;
  --bg4:#252d42;
  --border:#2a3350;
  --border2:#323d5a;
  --text:#e8ecf4;
  --text2:#8892b0;
  --text3:#4a5578;
  --accent:#7c6af7;
  --accent-soft:rgba(124,106,247,.15);
  --accent-glow:rgba(124,106,247,.35);
  --green:#2dd4a0;
  --green-soft:rgba(45,212,160,.13);
  --blue:#4a9eff;
  --blue-soft:rgba(74,158,255,.13);
  --orange:#f97316;
  --orange-soft:rgba(249,115,22,.13);
  --pink:#f472b6;
  --pink-soft:rgba(244,114,182,.13);
  --red:#f87171;
  --topbar:60px;
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 4px 24px rgba(0,0,0,.4);
  --font:'Plus Jakarta Sans',sans-serif;
  --mono:'JetBrains Mono',monospace;
}
html,body{height:100%;overflow:hidden;font-family:var(--font);background:var(--bg);color:var(--text);font-size:14px}

/* ===== LAYOUT ===== */
.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}

/* TOPBAR */
.topbar{
  height:var(--topbar);flex-shrink:0;
  background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;padding:0 16px;gap:14px;
  z-index:20;
}
.topbar-brand{
  display:flex;align-items:center;flex-shrink:0;cursor:pointer;
  padding:6px 8px;margin-right:6px;border-radius:var(--radius-sm);
  transition:background .18s;
}
.topbar-brand:hover{background:var(--bg3)}
.brand-logo{
  font-size:22px;font-weight:800;
  color:var(--text);letter-spacing:-.5px;line-height:1;
}
.brand-logo span{color:var(--accent)}

.topbar-nav{
  display:flex;align-items:center;justify-content: center; gap:5px;flex:1;min-width:0;
  overflow-x:auto;overflow-y:hidden;
  scrollbar-width:none;-ms-overflow-style:none;
}
.topbar-nav::-webkit-scrollbar{display:none}

.nav-item{
  display:flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:var(--radius-sm);
  cursor:pointer;transition:all .18s;
  color:var(--text2);font-size:13px;font-weight:500;
  border:1px solid transparent;
  white-space:nowrap;flex-shrink:0;
}
.nav-item svg{flex-shrink:0;opacity:.7}
.nav-item:hover{background:var(--bg3);color:var(--text)}
.nav-item.active{background:var(--accent-soft);color:var(--accent);border-color:rgba(124,106,247,.3)}
.nav-item.active svg{opacity:1}

.topbar-right{display:flex;align-items:center;gap:8px;flex-shrink:0}
.search-box{
  display:flex;align-items:center;gap:8px;
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:7px 10px;
  width:200px;transition:border-color .18s;
}
.search-box:focus-within{border-color:var(--accent)}
.search-box input{background:none;border:none;outline:none;color:var(--text);font-family:var(--font);font-size:13px;flex:1;min-width:0}
.search-box input::placeholder{color:var(--text3)}
.search-kbd{font-family:var(--mono);font-size:10px;color:var(--text3);background:var(--bg4);border:1px solid var(--border2);border-radius:4px;padding:2px 5px}
.icon-btn{width:34px;height:34px;border-radius:var(--radius-sm);background:var(--bg3);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .18s;color:var(--text2)}
.icon-btn:hover{border-color:var(--border2);color:var(--text)}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;cursor:pointer}

/* Compactação responsiva: em telas estreitas, esconde os rótulos da nav */
@media (max-width: 1180px){
  .nav-item span{display:none}
  .nav-item{padding:8px 10px}
}
@media (max-width: 880px){
  .search-box{width:140px}
}
@media (max-width: 720px){
  .search-box{display:none}
}

/* CONTENT AREA */
.content{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:20px;min-width:0}
.content::-webkit-scrollbar{width:6px}
.content::-webkit-scrollbar-track{background:transparent}
.content::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}

/* CALC CARD */
.calc-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.calc-card-header{
  padding:18px 20px 14px;
  border-bottom:1px solid var(--border);
  display:flex;align-items:flex-start;gap:12px;
}
.calc-card-header-text{flex:1}
.calc-card-header-text h2{font-size:16px;font-weight:700;color:var(--text)}
.calc-card-header-text p{font-size:12px;color:var(--text2);margin-top:2px}
.header-actions{display:flex;gap:6px}
.hbtn{width:30px;height:30px;border-radius:var(--radius-sm);background:var(--bg3);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text2);transition:all .18s}
.hbtn:hover{border-color:var(--border2);color:var(--text)}

.calc-body{display:grid;grid-template-columns:280px 1fr;gap:0;min-height:400px}

/* LEFT INPUTS */
.calc-inputs{padding:20px;border-right:1px solid var(--border);display:flex;flex-direction:column;gap:16px;overflow-y:auto}
.input-section{}
.input-label{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text2);margin-bottom:8px;display:flex;align-items:center;gap:6px}
.input-label-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);flex-shrink:0}
.input-label-dot.green{background:var(--green)}
.input-label-dot.blue{background:var(--blue)}
.xyz-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px}
.xyz-input{display:flex;flex-direction:column;gap:3px}
.xyz-input label{font-size:10px;font-weight:600;color:var(--text3);font-family:var(--mono);text-align:center}
.xyz-input input{
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:8px 6px;
  color:var(--text);font-family:var(--mono);font-size:15px;font-weight:500;
  text-align:center;outline:none;width:100%;
  transition:border-color .18s,background .18s;
}
.xyz-input input:focus{border-color:var(--accent);background:var(--bg4)}

.op-select-wrap{position:relative}
.op-select{
  width:100%;padding:9px 32px 9px 12px;
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--radius-sm);color:var(--text);
  font-family:var(--font);font-size:13px;font-weight:500;
  outline:none;cursor:pointer;-webkit-appearance:none;
  transition:border-color .18s;
}
.op-select:focus{border-color:var(--accent)}
.op-select-arrow{position:absolute;right:10px;top:50%;transform:translateY(-50%);pointer-events:none;color:var(--text3)}

.calc-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.btn-calc{
  padding:10px;border-radius:var(--radius-sm);
  font-family:var(--font);font-size:13px;font-weight:600;
  cursor:pointer;transition:all .18s;display:flex;align-items:center;justify-content:center;gap:6px;
  border:none;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#8e7df9;transform:translateY(-1px);box-shadow:0 4px 16px var(--accent-glow)}
.btn-secondary{background:var(--bg3);color:var(--text2);border:1px solid var(--border)!important;}
.btn-secondary:hover{border-color:var(--border2)!important;color:var(--text)}

/* 3D VIEWER */
.viewer-area{position:relative;background:var(--bg);overflow:hidden;display:flex;flex-direction:column}
.viewer-toolbar{
  display:flex;align-items:center;gap:8px;padding:10px 14px;
  background:var(--bg2);border-bottom:1px solid var(--border);
  flex-shrink:0;
}
.view-label{font-size:11px;font-weight:600;color:var(--text2);margin-right:4px;letter-spacing:.05em}
.vbtn{
  padding:4px 10px;border-radius:5px;font-size:11px;font-weight:500;
  background:var(--bg3);border:1px solid var(--border);color:var(--text2);
  cursor:pointer;transition:all .15s;font-family:var(--font);
}
.vbtn:hover{border-color:var(--border2);color:var(--text)}
.vbtn.on{background:var(--accent-soft);border-color:rgba(124,106,247,.4);color:var(--accent)}
.vbtn-interact{
  margin-left:auto;padding:5px 12px;
  background:var(--bg3);border:1px solid var(--border);
  border-radius:var(--radius-sm);font-size:11px;font-weight:500;color:var(--text2);
  cursor:pointer;display:flex;align-items:center;gap:5px;font-family:var(--font);
  transition:all .18s;
}
.vbtn-interact:hover{border-color:var(--border2);color:var(--text)}
.canvas-host{flex:1;position:relative;min-height:0}
.canvas-host canvas{display:block;width:100%!important;height:100%!important}
.viewer-legend{
  position:absolute;bottom:10px;left:12px;
  display:flex;flex-direction:column;gap:4px;
  pointer-events:none;
}
.leg-item{display:flex;align-items:center;gap:6px;font-size:11px;color:var(--text2);font-weight:500}
.leg-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.viewer-hint{position:absolute;bottom:10px;right:12px;font-size:10px;color:var(--text3);font-family:var(--mono)}

/* RIGHT PANEL */
.right-panel{width:240px;flex-shrink:0;background:var(--bg2);border-left:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}
.result-panel{padding:16px;border-bottom:1px solid var(--border);flex-shrink:0}
.result-panel-title{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text2);display:flex;align-items:center;gap:6px;margin-bottom:14px}
.result-main{margin-bottom:14px}
.result-main-label{font-size:11px;color:var(--text2);margin-bottom:4px}
.result-main-val{font-size:22px;font-weight:800;color:var(--accent);font-family:var(--mono);line-height:1.2}
.result-rows{display:flex;flex-direction:column;gap:5px}
.result-row{display:flex;justify-content:space-between;align-items:center;font-size:12px;padding:5px 8px;background:var(--bg3);border-radius:6px;border:1px solid var(--border)}
.result-row-key{color:var(--text2)}
.result-row-val{font-family:var(--mono);font-weight:600;color:var(--text)}
.result-row-val.accent{color:var(--accent)}
.result-row-val.green{color:var(--green)}
.result-row-val.blue{color:var(--blue)}
.steps-panel{flex:1;padding:16px;overflow-y:auto}
.steps-panel::-webkit-scrollbar{width:4px}
.steps-panel::-webkit-scrollbar-thumb{background:var(--border2);border-radius:2px}
.steps-title{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text2);display:flex;align-items:center;gap:6px;margin-bottom:12px}
.step-list{display:flex;flex-direction:column;gap:8px}
.step-item{display:flex;gap:8px;font-size:12px;color:var(--text2);line-height:1.5}
.step-num{width:18px;height:18px;border-radius:50%;background:var(--accent-soft);border:1px solid rgba(124,106,247,.3);color:var(--accent);font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.step-content{flex:1}
.step-highlight{color:var(--accent);font-family:var(--mono);font-weight:600}

/* TABS */
.tabs{display:flex;gap:0;border-bottom:1px solid var(--border);flex-shrink:0}
.tab{
  padding:10px 16px;font-size:12px;font-weight:600;color:var(--text2);
  cursor:pointer;border-bottom:2px solid transparent;transition:all .18s;
  white-space:nowrap;
}
.tab:hover{color:var(--text)}
.tab.active{color:var(--accent);border-bottom-color:var(--accent)}

/* TOPIC CARDS */
.explore-section{flex-shrink:0}
.explore-section h2{font-size:15px;font-weight:700;color:var(--text);margin-bottom:14px}
.topic-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.topic-card{
  background:var(--bg2);border:1px solid var(--border);
  border-radius:var(--radius);padding:16px;
  cursor:pointer;transition:all .2s;
}
.topic-card:hover{border-color:var(--border2);transform:translateY(-2px);box-shadow:var(--shadow)}
.topic-icon{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:10px;font-size:18px}
.topic-icon.purple{background:var(--accent-soft)}
.topic-icon.green{background:var(--green-soft)}
.topic-icon.orange{background:var(--orange-soft)}
.topic-icon.blue{background:var(--blue-soft)}
.topic-icon.pink{background:var(--pink-soft)}
.topic-card h3{font-size:13px;font-weight:700;color:var(--text);margin-bottom:4px}
.topic-card p{font-size:11px;color:var(--text2);line-height:1.5;margin-bottom:10px}
.topic-link{font-size:11px;font-weight:600;color:var(--accent);display:flex;align-items:center;gap:3px}
.topic-link.green{color:var(--green)}
.topic-link.blue{color:var(--blue)}
.topic-link.orange{color:var(--orange)}
.topic-link.pink{color:var(--pink)}

/* PAGE VIEWS */
#pages-wrap{flex:1;position:relative;overflow:hidden;min-height:0}
.page{display:none;position:absolute;inset:0;flex-direction:column;overflow:hidden}
.page.active{display:flex}

/* FORMULA PAGE */
.formula-page{padding:24px;overflow-y:auto;flex:1}
.formula-page::-webkit-scrollbar{width:6px}
.formula-page::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
.formula-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin-top:16px}
.formula-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.formula-card h3{font-size:13px;font-weight:700;color:var(--text);margin-bottom:4px;display:flex;align-items:center;gap:6px}
.formula-card p{font-size:11px;color:var(--text2);margin-bottom:10px;line-height:1.5}
.formula-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;font-family:var(--mono);font-size:12px;color:var(--accent);line-height:1.8}
.formula-tag{font-size:9px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:2px 6px;border-radius:4px;background:var(--accent-soft);color:var(--accent)}

/* EXERCISES PAGE */
.exercises-page{padding:24px;overflow-y:auto;flex:1}
.exercises-page::-webkit-scrollbar{width:6px}
.exercises-page::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
.ex-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px;margin-top:16px}
.ex-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:18px;cursor:pointer;transition:all .18s}
.ex-card:hover{border-color:var(--border2)}
.ex-card-top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:10px}
.ex-badge{font-size:10px;font-weight:700;padding:3px 8px;border-radius:20px;text-transform:uppercase;letter-spacing:.06em}
.ex-badge.easy{background:var(--green-soft);color:var(--green)}
.ex-badge.med{background:var(--orange-soft);color:var(--orange)}
.ex-badge.hard{background:rgba(248,113,113,.13);color:var(--red)}
.ex-card h3{font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px}
.ex-card p{font-size:12px;color:var(--text2);line-height:1.5;margin-bottom:12px}
.ex-problem{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;font-family:var(--mono);font-size:12px;color:var(--text2);margin-bottom:12px;line-height:1.6}
.ex-resolve{
  width:100%;padding:8px;border-radius:var(--radius-sm);
  background:var(--accent-soft);border:1px solid rgba(124,106,247,.3);
  color:var(--accent);font-family:var(--font);font-size:12px;font-weight:600;
  cursor:pointer;transition:all .18s;
}
.ex-resolve:hover{background:var(--accent);color:#fff}

/* LEARN PAGE */
.learn-page{padding:24px;overflow-y:auto;flex:1}
.learn-page::-webkit-scrollbar{width:6px}
.learn-page::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
.learn-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:16px}
.learn-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:all .18s}
.learn-card:hover{border-color:var(--border2);transform:translateY(-2px)}
.learn-card-top{height:80px;display:flex;align-items:center;justify-content:center;font-size:32px;position:relative;overflow:hidden}
.learn-card-body{padding:14px}
.learn-card h3{font-size:13px;font-weight:700;color:var(--text);margin-bottom:4px}
.learn-card p{font-size:11px;color:var(--text2);line-height:1.5;margin-bottom:10px}
.learn-progress{height:3px;background:var(--bg4);border-radius:2px;overflow:hidden}
.learn-progress-fill{height:100%;border-radius:2px;transition:width .4s}

/* ABOUT PAGE */
.about-page{padding:24px;overflow-y:auto;flex:1;max-width:700px}
.about-page h2{font-size:22px;font-weight:800;margin-bottom:8px}
.about-page p{font-size:13px;color:var(--text2);line-height:1.7;margin-bottom:16px}
.about-section-title{font-size:13px;font-weight:700;color:var(--text);margin-bottom:8px;margin-top:20px}
.feature-list{display:flex;flex-direction:column;gap:8px}
.feature-item{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm)}
.feature-icon{width:28px;height:28px;border-radius:6px;background:var(--accent-soft);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.feature-text h4{font-size:12px;font-weight:600;color:var(--text);margin-bottom:2px}
.feature-text p{font-size:11px;color:var(--text2);line-height:1.5}

/* NOTIFICATIONS */
.toast{
  position:fixed;bottom:24px;right:24px;z-index:999;
  background:var(--bg2);border:1px solid var(--border2);
  border-radius:var(--radius);padding:12px 16px;
  font-size:13px;color:var(--text);
  transform:translateY(80px);opacity:0;
  transition:all .3s;pointer-events:none;
  box-shadow:var(--shadow);
  display:flex;align-items:center;gap:8px;
}
.toast.show{transform:translateY(0);opacity:1}
.toast-dot{width:8px;height:8px;border-radius:50%;background:var(--green);flex-shrink:0}

/* RESPONSIVE */
@media(max-width:900px){.right-panel{display:none}.topic-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.calc-body{grid-template-columns:1fr;grid-template-rows:auto 300px}.right-panel{display:none}.topic-grid{grid-template-columns:1fr 1fr}}

/* ===== HOME PAGE ===== */
.home-page{flex:1;overflow-y:auto;display:flex;flex-direction:column;min-height:0}
.home-page::-webkit-scrollbar{width:6px}
.home-page::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}

/* HERO */
.home-hero{
  position:relative;padding:72px 56px 68px;
  background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:60px;flex-shrink:0;overflow:hidden;
  min-height:420px;
}
.hero-bg-glow{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(ellipse 60% 100% at 76% 50%,rgba(124,106,247,.18) 0%,transparent 65%),
    radial-gradient(ellipse 40% 60% at 14% 90%,rgba(45,212,160,.09) 0%,transparent 55%),
    radial-gradient(ellipse 30% 40% at 50% 0%,rgba(74,158,255,.06) 0%,transparent 60%);
}
.hero-bg-grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(42,51,80,.6) 1px,transparent 1px),linear-gradient(90deg,rgba(42,51,80,.6) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(ellipse 70% 100% at 76% 50%,black 0%,transparent 72%);
  mask-image:radial-gradient(ellipse 70% 100% at 76% 50%,black 0%,transparent 72%);
  opacity:.6;
}
.hero-content{flex:1;position:relative;z-index:1;min-width:0}
.hero-badge{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 15px;border-radius:20px;
  background:var(--accent-soft);border:1px solid rgba(124,106,247,.35);
  font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);margin-bottom:28px;
}
.hero-badge-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:hbpulse 2.2s ease-in-out infinite}
@keyframes hbpulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}
.hero-title{font-size:54px;font-weight:800;color:var(--text);line-height:1.06;letter-spacing:-.04em;margin-bottom:20px}
.hero-title-grad{
  background:linear-gradient(130deg,#a78bfa 0%,var(--accent) 45%,#60a5fa 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero-desc{font-size:15px;color:var(--text2);line-height:1.8;margin-bottom:34px;max-width:460px}
.hero-ctas{display:flex;gap:12px;margin-bottom:44px;flex-wrap:wrap}
.hero-btn-p,
.hero-btn-s{
  padding:13px 26px;border-radius:var(--radius);background:var(--accent);color:#fff;border:none;
  font-family:var(--font);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;
  display:flex;align-items:center;gap:8px;
}
.hero-btn-p:hover{background:#8e7df9;transform:translateY(-1px);box-shadow:0 8px 28px rgba(124,106,247,.5)}
.hero-btn-s{
  padding:13px 26px;border-radius:var(--radius);background:transparent;
  color:var(--text2);border:1px solid var(--border2);
  font-family:var(--font);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s;
}
.hero-btn-s:hover{border-color:var(--accent);color:var(--accent)}
.hero-stats{display:flex;gap:36px}
.hero-stat-n{font-size:32px;font-weight:800;font-family:var(--mono);color:var(--text);line-height:1;display:block}
.hero-stat-l{font-size:10px;color:var(--text3);font-weight:500;margin-top:4px;display:block;letter-spacing:.04em;text-transform:uppercase}

/* 3D SVG Visual */
.hero-visual{flex-shrink:0;width:480px;height:380px;position:relative;z-index:1}
@media(max-width:1150px){.hero-visual{width:360px;height:280px}}
@media(max-width:980px){.hero-visual{display:none}}
@media(max-width:700px){.home-hero{padding:44px 24px 40px;min-height:auto}.hero-title{font-size:36px}}

/* HOME BODY */
.home-body{padding:38px 48px 48px;display:flex;flex-direction:column;gap:40px}
@media(max-width:700px){.home-body{padding:28px 20px 36px}}
.home-sh{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.home-sh h2{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--text3);white-space:nowrap}
.home-sh-line{flex:1;height:1px;background:var(--border)}

/* FEATURE CARDS */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media(max-width:1050px){.feat-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.feat-grid{grid-template-columns:1fr}}
.feat-card{
  background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px 20px 18px;cursor:pointer;transition:all .22s;position:relative;overflow:hidden;
}
.feat-card::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse 80% 60% at 50% 0%,var(--fglow,rgba(124,106,247,.08)) 0%,transparent 70%);
  opacity:0;transition:opacity .22s;
}
.feat-card::after{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--fc,var(--accent));transform:scaleX(0);transform-origin:left;transition:transform .22s;
}
.feat-card:hover{border-color:var(--border2);transform:translateY(-3px);box-shadow:0 10px 32px rgba(0,0,0,.3)}
.feat-card:hover::before{opacity:1}
.feat-card:hover::after{transform:scaleX(1)}
.feat-icon{
  width:44px;height:44px;border-radius:12px;background:var(--fi,var(--accent-soft));
  display:flex;align-items:center;justify-content:center;margin-bottom:14px;
}
.feat-card h3{font-size:14px;font-weight:700;color:var(--text);margin-bottom:5px}
.feat-card p{font-size:12px;color:var(--text2);line-height:1.68;margin-bottom:14px}
.feat-link{font-size:11px;font-weight:600;color:var(--fc,var(--accent));display:flex;align-items:center;gap:4px}

/* OPERATIONS CHIPS */
.ops-grid{display:flex;flex-wrap:wrap;gap:8px}
.op-chip{
  padding:7px 14px;border-radius:20px;background:var(--bg2);border:1px solid var(--border);
  font-size:11px;font-weight:500;color:var(--text2);cursor:pointer;transition:all .18s;
  display:flex;align-items:center;gap:7px;font-family:var(--mono);
}
.op-chip:hover{border-color:var(--oc,var(--accent));color:var(--oc,var(--accent));background:var(--accent-soft)}
.op-chip-dot{width:6px;height:6px;border-radius:50%;background:var(--oc,var(--accent));flex-shrink:0}

/* ===== MODULE LAYOUT ===== */
.mod-wrap{display:flex;flex-direction:column;height:100%}
.mod-header{display:flex;align-items:center;gap:16px;padding:0 20px;height:52px;flex-shrink:0;background:var(--bg2);border-bottom:1px solid var(--border)}
.mod-back-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;border-radius:var(--radius-sm);background:var(--bg3);border:1px solid var(--border);color:var(--text2);font-family:var(--font);font-size:12px;font-weight:500;cursor:pointer;transition:all .18s;flex-shrink:0}
.mod-back-btn:hover{border-color:var(--border2);color:var(--text)}
.mod-header-info{display:flex;align-items:center;gap:8px;flex:1}
.mod-badge{font-size:9px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;padding:3px 8px;border-radius:20px;background:var(--accent-soft);color:var(--accent);flex-shrink:0}
.mod-header-title{font-size:13px;font-weight:600;color:var(--text)}
.mod-header-prog{display:flex;align-items:center;gap:10px;flex-shrink:0}
.mod-prog-bar{width:140px;height:5px;background:var(--bg4);border-radius:3px;overflow:hidden}
.mod-prog-fill{height:100%;background:var(--accent);border-radius:3px;width:0%;transition:width .4s}
.mod-prog-txt{font-size:11px;color:var(--text3);font-family:var(--mono);white-space:nowrap}
.mod-body{display:flex;flex:1;overflow:hidden;min-height:0}
.mod-sidenav{width:210px;flex-shrink:0;background:var(--bg2);border-right:1px solid var(--border);overflow-y:auto;padding:12px 10px;display:flex;flex-direction:column;gap:2px}
.mod-sidenav::-webkit-scrollbar{width:4px}
.mod-sidenav::-webkit-scrollbar-thumb{background:var(--border2);border-radius:2px}
.mod-nav-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:var(--radius-sm);cursor:pointer;transition:all .15s;color:var(--text3);font-size:12px;font-weight:500;border:1px solid transparent;white-space:nowrap}
.mod-nav-item:hover{background:var(--bg3);color:var(--text2)}
.mod-nav-item.active{background:var(--accent-soft);color:var(--accent);border-color:rgba(124,106,247,.3)}
.mod-nav-item.done{color:var(--text2)}
.mod-nav-num{width:20px;height:20px;border-radius:50%;background:var(--bg4);border:1px solid var(--border);font-size:10px;font-weight:700;font-family:var(--mono);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--text3)}
.mod-nav-item.active .mod-nav-num{background:var(--accent);border-color:var(--accent);color:#fff}
.mod-nav-item.done .mod-nav-num{background:var(--green);border-color:var(--green);color:#fff}
.mod-content-area{flex:1;overflow-y:auto;display:flex;flex-direction:column}
.mod-content-area::-webkit-scrollbar{width:6px}
.mod-content-area::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
/* Section */
.mod-section{padding:30px 40px;max-width:1000px;width:100%}
.mod-section-title{font-size:30px;font-weight:800;color:var(--text);margin-bottom:6px;letter-spacing:-.02em}
.mod-section-sub{font-size:15px;color:var(--text2);margin-bottom:24px;line-height:1.7}
.mod-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:14px}
.mod-card h4{font-size:17px;font-weight:700;color:var(--text);margin-bottom:6px}
.mod-card p{font-size:13px;color:var(--text2);line-height:1.7}
.mod-two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.mod-canvas-wrap{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:14px;position:relative}
.mod-canvas-wrap canvas{display:block}
.mod-canvas-controls{padding:10px 14px;background:var(--bg2);border-top:1px solid var(--border);display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.mod-slider-wrap{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--text2)}
.mod-slider-wrap label{white-space:nowrap;font-size:11px;color:var(--text2)}
.mod-slider-wrap input[type=range]{width:110px;cursor:pointer;accent-color:var(--accent)}
.mod-slider-val{font-family:var(--mono);font-size:12px;color:var(--accent);min-width:36px}
.mod-formula-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:15px 14px;font-family:var(--mono);font-size:17px;color:var(--accent);margin:10px 0;text-align:center;line-height:1.9;align-items: center;display: flex;justify-content: center;}
.mod-hl{color:var(--accent);font-weight:700;font-family:var(--mono)}
.mod-green{color:var(--green)}
.mod-blue{color:var(--blue)}
.mod-orange{color:var(--orange)}
.mod-info-row{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;font-size:12px;color:var(--text2);line-height:1.6}
.mod-info-icon{font-size:14px;flex-shrink:0}
/* Nav buttons */
.mod-nav-btns{display:flex;gap:10px;padding:16px 40px 32px;margin-top:auto;flex-shrink:0}
.mod-btn{padding:10px 22px;border-radius:var(--radius-sm);font-family:var(--font);font-size:13px;font-weight:600;cursor:pointer;transition:all .18s;border:none}
.mod-btn-primary{background:var(--accent);color:#fff}
.mod-btn-primary:hover{background:#8e7df9;transform:translateY(-1px)}
.mod-btn-secondary{background:var(--bg3);color:var(--text2);border:1px solid var(--border)!important}
.mod-btn-secondary:hover{border-color:var(--border2)!important;color:var(--text)}
/* Toggle */
.mod-toggle-group{display:flex;gap:6px;margin-bottom:10px;flex-wrap:wrap}
.mod-toggle-btn{padding:6px 14px;border-radius:20px;background:var(--bg3);border:1px solid var(--border);color:var(--text2);font-size:11px;font-weight:600;cursor:pointer;transition:all .15s;font-family:var(--font)}
.mod-toggle-btn.on{background:var(--accent-soft);border-color:rgba(124,106,247,.4);color:var(--accent)}
/* Flip cards */
.flip-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:14px}
.flip-card{height:156px;perspective:800px;cursor:pointer}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flip-card.flipped .flip-inner{transform:rotateY(180deg)}
.flip-front,.flip-back{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius);padding:14px;display:flex;flex-direction:column;justify-content:center;gap:6px}
.flip-front{background:var(--bg2);border:1px solid var(--border)}
.flip-back{background:var(--bg3);border:1px solid var(--border2);transform:rotateY(180deg)}
.flip-label{font-size:9px;font-weight:700;text-transform:uppercase;letter-spacing:.12em}
.flip-label.err{color:var(--red)}
.flip-label.fix{color:var(--green)}
.flip-front h4,.flip-back h4{font-size:12px;font-weight:700;color:var(--text);line-height:1.4}
.flip-back p{font-size:11px;color:var(--text2);line-height:1.5}
.flip-hint{font-size:10px;color:var(--text3);margin-top:auto;padding-top:6px}
/* Exercises */
.mod-exercise{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:12px}
.mod-ex-num{font-size:9px;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:var(--text3);margin-bottom:5px}
.mod-exercise h4{font-size:13px;font-weight:700;color:var(--text);margin-bottom:4px}
.mod-exercise p{font-size:12px;color:var(--text2);line-height:1.6;margin-bottom:10px}
.mod-ex-problem{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 12px;font-family:var(--mono);font-size:12px;color:var(--text2);margin-bottom:12px;line-height:1.7}
.mod-ex-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.mod-ex-input{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;color:var(--text);font-family:var(--mono);font-size:13px;font-weight:500;outline:none;width:80px;text-align:center;transition:border-color .18s}
.mod-ex-input:focus{border-color:var(--accent)}
.mod-ex-btn{padding:8px 16px;border-radius:var(--radius-sm);background:var(--accent);color:#fff;border:none;font-family:var(--font);font-size:12px;font-weight:600;cursor:pointer;transition:all .18s}
.mod-ex-btn:hover{background:#8e7df9}
.mod-ex-fb{font-size:12px;font-weight:600;margin-top:8px;padding:6px 10px;border-radius:var(--radius-sm);display:none}
.mod-ex-fb.ok{background:rgba(45,212,160,.12);color:var(--green);border:1px solid rgba(45,212,160,.3);display:block}
.mod-ex-fb.no{background:rgba(248,113,113,.1);color:var(--red);border:1px solid rgba(248,113,113,.3);display:block}
/* Accordion */
.mod-accordion{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin-bottom:14px}
.mod-acc-item{border-bottom:1px solid var(--border)}
.mod-acc-item:last-child{border-bottom:none}
.mod-acc-header{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;cursor:pointer;transition:background .15s;font-size:13px;font-weight:600;color:var(--text)}
.mod-acc-header:hover{background:var(--bg3)}
.mod-acc-header svg{transition:transform .25s;flex-shrink:0}
.mod-acc-item.open .mod-acc-header svg{transform:rotate(180deg)}
.mod-acc-body{display:none;padding:4px 16px 16px}
.mod-acc-item.open .mod-acc-body{display:block}
.mod-step{display:flex;gap:10px;margin-bottom:8px}
.mod-step-n{width:22px;height:22px;border-radius:50%;background:var(--accent-soft);border:1px solid rgba(124,106,247,.3);color:var(--accent);font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}
.mod-step p{font-size:12px;color:var(--text2);line-height:1.6;padding-top:2px}
/* Cheat sheet */
.mod-cheat{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-bottom:14px}
.mod-cheat-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:14px}
.mod-cheat-card h5{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text3);margin-bottom:6px}
.mod-cheat-card .mod-formula-box{font-size:11px;margin:0;padding:7px 10px}
/* Confetti */
@keyframes cffall{to{transform:translateY(100vh) rotate(720deg);opacity:0}}

/* ===== KATEX OVERRIDES ===== */
.formula-box .katex, .formula-box .katex-display,
.mod-formula-box .katex, .mod-formula-box .katex-display {
  font-size: 1em;
  color: var(--accent);
}
.formula-box .katex-display, .mod-formula-box .katex-display { margin: 0; }
.formula-box, .mod-formula-box { overflow: visible; }
#c-res-label .katex, #c-res-val .katex { color: inherit; }
.result-row-key .katex, .result-row-val .katex, .step-highlight .katex {
  color: inherit;
  font-size: 0.95em;
}
.cf-piece{position:fixed;width:8px;height:8px;border-radius:2px;animation:cffall 1.2s ease-in forwards;pointer-events:none;z-index:9999}

/* ===== APRENDER — Geometria Analítica (estrutura de navegação) ===== */
.learn-wrap{display:flex;flex-direction:column;height:100%;flex:1;overflow:hidden}
.learn-header{display:flex;align-items:center;gap:16px;padding:0 20px;height:52px;flex-shrink:0;background:var(--bg2);border-bottom:1px solid var(--border)}
.learn-header-info{display:flex;align-items:center;gap:10px;flex:1;min-width:0}
.learn-badge{font-size:9px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;padding:3px 8px;border-radius:20px;background:var(--accent-soft);color:var(--accent);flex-shrink:0}
.learn-header-title{font-size:13px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.learn-header-prog{display:flex;align-items:center;gap:10px;flex-shrink:0}
.learn-prog-bar{width:140px;height:5px;background:var(--bg4);border-radius:3px;overflow:hidden}
.learn-prog-fill{height:100%;background:var(--accent);border-radius:3px;width:0%;transition:width .4s}
.learn-prog-txt{font-size:11px;color:var(--text3);font-family:var(--mono);white-space:nowrap}
.learn-body{display:flex;flex:1;overflow:hidden;min-height:0}

.learn-sidenav{width:260px;flex-shrink:0;background:var(--bg2);border-right:1px solid var(--border);overflow-y:auto;padding:8px 6px}
.learn-sidenav::-webkit-scrollbar{width:5px}
.learn-sidenav::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}

.learn-topic{margin-bottom:2px}
.learn-topic-header{display:flex;align-items:center;gap:8px;padding:7px 9px;border-radius:var(--radius-sm);cursor:pointer;transition:background .15s;color:var(--text2);font-size:12px;font-weight:600;border:1px solid transparent;user-select:none}
.learn-topic-header:hover{background:var(--bg3);color:var(--text)}
.learn-topic.open > .learn-topic-header{color:var(--text)}
.learn-topic-num{width:22px;height:22px;border-radius:50%;background:var(--bg4);border:1px solid var(--border);font-size:10px;font-weight:700;font-family:var(--mono);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--text3)}
.learn-topic.has-active > .learn-topic-header > .learn-topic-num{background:var(--accent);border-color:var(--accent);color:#fff}
.learn-topic-title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.25}
.learn-topic-chevron{flex-shrink:0;width:14px;height:14px;color:var(--text3);transition:transform .2s}
.learn-topic.open > .learn-topic-header > .learn-topic-chevron{transform:rotate(90deg);color:var(--accent)}

.learn-topic-subs{display:none;padding:2px 0 4px 18px;border-left:1px dashed var(--border);margin:2px 0 4px 19px}
.learn-topic.open > .learn-topic-subs{display:block}
.learn-sub-item{display:flex;align-items:center;gap:8px;padding:6px 9px;border-radius:var(--radius-sm);cursor:pointer;transition:all .15s;color:var(--text3);font-size:11.5px;font-weight:500;border:1px solid transparent;line-height:1.3}
.learn-sub-item:hover{background:var(--bg3);color:var(--text2)}
.learn-sub-item.active{background:var(--accent-soft);color:var(--accent);border-color:rgba(124,106,247,.3)}
.learn-sub-item.done{color:var(--text2)}
.learn-sub-num{font-family:var(--mono);font-size:10px;font-weight:700;color:var(--text3);flex-shrink:0;min-width:28px}
.learn-sub-item.active .learn-sub-num{color:var(--accent)}
.learn-sub-item.done .learn-sub-num{color:var(--green)}
.learn-sub-title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.learn-content-area{flex:1;overflow-y:auto;display:flex;flex-direction:column}
.learn-content-area::-webkit-scrollbar{width:6px}
.learn-content-area::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
.learn-section{padding:30px 40px 16px;max-width:1000px;width:100%}
.learn-section-eyebrow{font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--text3);margin-bottom:6px}
.learn-section-title{font-size:28px;font-weight:800;color:var(--text);margin-bottom:6px;letter-spacing:-.02em;line-height:1.2}
.learn-section-sub{font-size:13px;color:var(--text3);margin-bottom:22px}

.learn-block{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin-bottom:14px}
.learn-block-title{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:10px;display:flex;align-items:center;gap:8px}
.learn-block-title::before{content:"";width:3px;height:14px;background:var(--accent);border-radius:2px}
.learn-block-body{font-size:13.5px;color:var(--text2);line-height:1.7}
.learn-placeholder{color:var(--text3);font-style:italic;font-size:13px;padding:4px 0}

.learn-viz-box{background:var(--bg4);border:1px dashed var(--border2);border-radius:var(--radius);padding:22px 22px;color:var(--text2);font-size:13px;line-height:1.7;min-height:140px;display:flex;align-items:center;justify-content:center;text-align:center}
.learn-viz-box .katex{color:var(--text)}
.learn-viz-inner{max-width:760px}
.learn-viz-tag{display:inline-block;font-size:9px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--text3);margin-bottom:10px}

.learn-nav-btns{display:flex;gap:10px;padding:8px 40px 32px;margin-top:auto;flex-shrink:0}
.learn-btn{padding:10px 22px;border-radius:var(--radius-sm);font-family:var(--font);font-size:13px;font-weight:600;cursor:pointer;transition:all .18s;border:none;display:inline-flex;align-items:center;gap:6px}
.learn-btn:disabled{opacity:.4;cursor:not-allowed}
.learn-btn-prev{background:var(--bg3);color:var(--text2);border:1px solid var(--border)}
.learn-btn-prev:hover:not(:disabled){border-color:var(--border2);color:var(--text)}
.learn-btn-next{background:var(--accent);color:#fff;margin-left:auto}
.learn-btn-next:hover:not(:disabled){background:#8e7df9;transform:translateY(-1px)}

/* ===== APRENDER — Conteúdo didático (Tópico 1+) ===== */
.learn-block-body p{margin-bottom:10px}
.learn-block-body p:last-child{margin-bottom:0}
.ga-h4{font-size:13px;font-weight:700;color:var(--text);margin:12px 0 6px;letter-spacing:-.01em}
.ga-list{margin:6px 0 6px 18px;color:var(--text2);font-size:13.5px;line-height:1.75}
.ga-list li{margin-bottom:4px}
.ga-list strong{color:var(--text)}
.ga-formula{background:var(--bg4);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin:10px 0;text-align:center}
.ga-formula .katex{color:var(--text);font-size:1.08em}

/* ----- Interactive viz wrappers ----- */
.ga-viz3d, .ga-viz2d{display:grid;grid-template-columns:1.4fr 1fr;gap:14px;align-items:stretch}
@media (max-width:780px){.ga-viz3d,.ga-viz2d{grid-template-columns:1fr}}
.ga-3d-host{background:#0a0d14;border:1px solid var(--border);border-radius:var(--radius-sm);height:380px;min-height:300px;width:100%;overflow:hidden;position:relative;cursor:grab}
.ga-3d-host:active{cursor:grabbing}
.ga-3d-host canvas{display:block;width:100%;height:100%}
.ga-3d-side, .ga-2d-side{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;display:flex;flex-direction:column;gap:10px;font-size:13px}
.ga-3d-readout, .ga-2d-readout{font-family:var(--mono);font-size:13px;font-weight:600;color:var(--accent);background:var(--accent-soft);border:1px solid rgba(124,106,247,.3);border-radius:var(--radius-sm);padding:8px 10px;text-align:center}
.ga-slider-row{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px}
.ga-slider-row label{width:18px;font-weight:700;color:var(--text2)}
.ga-slider-row label.lx{color:#ef4444}
.ga-slider-row label.ly{color:#22c55e}
.ga-slider-row label.lz{color:#3b82f6}
.ga-slider-row input[type=range]{flex:1;accent-color:var(--accent)}
.ga-slider-row span{width:36px;text-align:right;color:var(--text);font-weight:600}
.ga-input-row{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px}
.ga-input-row label{width:18px;font-weight:700;color:var(--text2)}
.ga-input-row input{flex:1;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);padding:6px 8px;font-family:var(--mono);font-size:12px}
.ga-input-row input:focus{outline:none;border-color:var(--accent)}
.ga-btn{background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);padding:8px 12px;font-family:var(--font);font-size:12px;font-weight:600;cursor:pointer;transition:background .15s}
.ga-btn:hover{background:#8e7df9}
.ga-btn-toggle{background:var(--bg4);color:var(--text);border:1px solid var(--border)}
.ga-btn-toggle:hover{background:var(--bg2);border-color:var(--accent)}
.ga-hint{font-size:11.5px;color:var(--text3);line-height:1.55;padding-top:6px;border-top:1px dashed var(--border)}

/* ----- 2D canvas (1.3) ----- */
.ga-2d-canvas{display:block;width:100%;height:380px;background:#0a0d14;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:crosshair}
.ga-quad-legend{display:grid;grid-template-columns:auto 1fr;gap:4px 8px;font-size:11px;font-family:var(--mono);color:var(--text2);padding-top:6px;border-top:1px dashed var(--border)}
.ga-quad{display:inline-block;width:22px;text-align:center;font-weight:700;border-radius:4px;padding:1px 0}
.ga-quad.q1{background:rgba(124,106,247,.2);color:#a892ff}
.ga-quad.q2{background:rgba(45,212,160,.2);color:#5eebbe}
.ga-quad.q3{background:rgba(74,158,255,.2);color:#7ab8ff}
.ga-quad.q4{background:rgba(244,114,182,.2);color:#f896c8}

/* ----- Timeline (1.2) ----- */
.ga-timeline{display:flex;gap:14px;overflow-x:auto;padding:6px 2px 14px;scroll-snap-type:x mandatory}
.ga-timeline::-webkit-scrollbar{height:6px}
.ga-timeline::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
.ga-tl-card{flex:0 0 260px;background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;scroll-snap-align:start;position:relative}
.ga-tl-card::before{content:"";position:absolute;top:-2px;left:14px;right:14px;height:2px;background:linear-gradient(90deg,var(--accent),transparent);border-radius:2px}
.ga-tl-year{font-family:var(--mono);font-size:11px;font-weight:700;color:var(--accent);letter-spacing:.05em;margin-bottom:4px}
.ga-tl-name{font-size:14px;font-weight:700;color:var(--text);margin-bottom:6px}
.ga-tl-blurb{font-size:12.5px;color:var(--text2);line-height:1.55}
.ga-tl-blurb .katex{color:var(--text)}

/* ----- Prereq cards (1.6) ----- */
.ga-prereq-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px}
.ga-prereq-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.ga-prereq-card[open]{border-color:var(--accent)}
.ga-prereq-card summary{cursor:pointer;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:13px;color:var(--text);list-style:none;user-select:none}
.ga-prereq-card summary::-webkit-details-marker{display:none}
.ga-prereq-card summary::after{content:"+";font-size:18px;color:var(--accent);font-weight:700;transition:transform .2s}
.ga-prereq-card[open] summary::after{content:"−"}
.ga-prereq-tag{font-size:10px;color:var(--text3);font-family:var(--mono);background:var(--bg4);padding:2px 6px;border-radius:10px;margin-left:auto}
.ga-prereq-body{padding:0 14px 14px;font-size:12.5px;color:var(--text2);line-height:1.65;border-top:1px dashed var(--border);padding-top:10px}
.ga-prereq-body .katex{color:var(--text)}

/* ----- Hand diagram (1.5) ----- */
.ga-hand-diagram{display:flex;flex-direction:column;gap:5px;padding-top:6px;border-top:1px dashed var(--border)}
.ga-hand-finger{font-family:var(--mono);font-size:11px;padding:5px 8px;border-radius:4px;font-weight:600}
.ga-hand-x{background:rgba(239,68,68,.13);color:#f87171}
.ga-hand-y{background:rgba(34,197,94,.13);color:#4ade80}
.ga-hand-z{background:rgba(59,130,246,.13);color:#60a5fa}

/* ===== APRENDER — Tópico 2 (Vetores: Conceitos Fundamentais) ===== */
/* ----- 2.1 split panel ----- */
.ga-split2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:780px){.ga-split2{grid-template-columns:1fr}}
.ga-svp{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;display:flex;flex-direction:column;gap:10px}
.ga-svp-canvas{display:block;width:100%;height:240px;background:#0a0d14;border:1px solid var(--border);border-radius:var(--radius-sm)}
.ga-panel-tag{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--text3);margin-bottom:2px}

/* ----- 2.5 versor readout ----- */
.ga-versor-out{background:var(--bg4);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;font-family:var(--mono);font-size:12px;color:var(--text2);line-height:1.55;text-align:center}
.ga-versor-out strong{color:#5eebbe}

/* ----- 2.7 gallery (2D / 3D toggle) ----- */
.ga-gallery-host{position:relative;width:100%;height:380px;min-height:300px}
.ga-gallery-canvas{display:block;width:100%;height:100%;background:#0a0d14;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer}
.ga-gallery-3d{background:#0a0d14;border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;height:100%;overflow:hidden;position:absolute;inset:0;cursor:grab}
.ga-gallery-3d:active{cursor:grabbing}
.ga-gallery-3d canvas{display:block;width:100%;height:100%}
.ga-vec-list{display:flex;flex-direction:column;gap:6px;max-height:220px;overflow-y:auto;padding-top:4px;border-top:1px dashed var(--border)}
.ga-vec-card{display:flex;align-items:center;gap:10px;background:var(--bg4);border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;font-family:var(--mono);font-size:11.5px;cursor:pointer;transition:background .15s,border-color .15s}
.ga-vec-card:hover{background:var(--bg2);border-color:var(--accent)}
.ga-vec-card.active{background:var(--accent-soft);border-color:var(--accent)}
.ga-vec-name{font-weight:700;width:32px;flex-shrink:0}
.ga-vec-info{color:var(--text2);font-size:11px;line-height:1.4}

/* ===== APRENDER — Tópico 3 (Operações Geométricas) ===== */
.ga-prop-tabs{display:grid;grid-template-columns:1fr 1fr;gap:5px}
.ga-prop-tab{background:var(--bg4);color:var(--text2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:6px 8px;font-family:var(--font);font-size:11px;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.ga-prop-tab:hover{background:var(--bg2);color:var(--text);border-color:var(--accent)}
.ga-prop-tab.active{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}
.ga-prop-formula{background:var(--bg4);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;text-align:center;font-family:var(--mono);font-size:12.5px;color:var(--text)}
.ga-prop-formula .katex{color:var(--text);font-size:1em}

.ga-status{font-family:var(--mono);font-size:12px;font-weight:700;text-align:center;padding:8px 10px;border-radius:var(--radius-sm);border:1px solid;letter-spacing:.02em}
.ga-status.on{background:rgba(94,235,190,.13);color:#5eebbe;border-color:rgba(94,235,190,.4)}
.ga-status.off{background:rgba(120,128,150,.10);color:var(--text3);border-color:var(--border)}

/* ===== APRENDER — Tópico 4 (Vetores em Coordenadas) ===== */
.ga-eq-pair{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.ga-eq-card{background:var(--bg4);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;display:flex;flex-direction:column;gap:5px}
.ga-eq-tag{font-family:var(--mono);font-size:11px;font-weight:700;text-align:center;text-transform:uppercase;letter-spacing:.1em;border-bottom:1px dashed var(--border);padding-bottom:4px;margin-bottom:2px}
.ga-eq-card .ga-input-row{font-size:11px}
.ga-eq-card .ga-input-row label{width:14px;color:var(--text3)}
.ga-eq-card .ga-input-row input{padding:4px 6px}

.ga-calc-steps{background:var(--bg4);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;font-family:var(--mono);font-size:11.5px;color:var(--text2);line-height:1.65;white-space:pre-wrap}
.ga-calc-steps strong{color:var(--accent)}
.ga-calc-steps .katex{color:var(--text)}