/* ════════════════════════════════════════════════════════════════
   SENAI · MVF v5 — Stylesheet
   Estrutura:
     1. Variáveis e Reset
     2. Layout (topbar, nav, drawer, content)
     3. Tipografia (h1, sub, sec, texto)
     4. Grid e Espaçamento
     5. Componentes Base (cards, alerts, highlights, expanders, tabelas)
     6. Botões
     7. Módulos de Estudo (formula cards, cenários)
     8. Prática (flashcards, quiz, calculadora)
     9. Simuladores (inputs, previews)
    10. Utilitários
    11. Tema Claro (.light)
    12. Transição de tema
    13. Botão de tema
    14. Responsivo Mobile (≤900px) e Desktop médio (901–1300px)
════════════════════════════════════════════════════════════════ */

/* ── 1. VARIÁVEIS E RESET ─────────────────────────────────────── */
*{box-sizing:border-box;margin:0;padding:0}

:root{
  /* Backgrounds */
  --bg:#0a0c10; --bg2:#12151e; --bg3:#181d28; --bg4:#1e2535;
  /* Cores de ênfase */
  --p:#00d4ff;  /* ciano  — pressão */
  --g:#00ff9d;  /* verde  — nível   */
  --y:#ffc040;  /* amarelo — vazão  */
  --r:#ff5566;  /* vermelho — erro  */
  --pu:#c084ff; /* roxo  — temperatura */
  --or:#ff9040; /* laranja — relações  */
  /* Texto */
  --t1:#f0f2f8; --t2:#b0bac8; --t3:#6a7585;
  /* Borda */
  --bd:rgba(255,255,255,0.09);
  /* Fontes */
  --f:'IBM Plex Sans',sans-serif;
  --fm:'IBM Plex Mono',monospace;
  --radius:10px;
  /* Sombra de card */
  --shadow:0 2px 12px rgba(0,0,0,0.35);
}

/* ── TEMA CLARO ──────────────────────────────────────────────── */
.light{
  --bg:#f0f4fb;
  --bg2:#ffffff;
  --bg3:#ffffff;
  --bg4:#eef2f9;
  --t1:#0d1117;
  --t2:#374151;
  --t3:#6b7280;
  --bd:rgba(0,0,0,0.09);
  --shadow:0 2px 12px rgba(0,0,0,0.10);
  /* Ajusta tons de ênfase para contraste no fundo claro */
  --p:#0099cc;
  --g:#00a366;
  --y:#d4880a;
  --r:#cc2233;
  --pu:#8b44e0;
  --or:#c75e00;
}

/* ── TRANSIÇÃO DE TEMA ───────────────────────────────────────── */
/* Aplica transição só nas propriedades visuais — NÃO inclui display/visibility */
html{
  transition: background-color .25s, color .25s;
}
.topbar,.brand,.content,.card,.blk,.alert,.hl,.xb,
.fcard,.scen-card,.cb-calc,.qz-box,.score-wrap,
.drawer,.drawer-brand,.d-group,.d-item,
.tgroup,.hamburger,.theme-btn,
.fc-f,.fc-b,.qz-opt,.qz-fb,.res,
.ig input, select, .sim-input, table, th, td,
.fcard-formula,.step,.var-pill{
  transition:
    background-color .2s,
    border-color .2s,
    color .15s,
    box-shadow .2s;
}
/* Interativos hover/flip — transição curta */
.titem,.d-item,.btn,.nav-arrow{
  transition:
    background-color .15s,
    border-color .15s,
    color .15s;
}
.fc-inner{
  transition: transform .5s;
  transform-style: preserve-3d;
}

/* ── BASE ────────────────────────────────────────────────────── */
html,body{
  width:100%; min-height:100vh;
  font-family:var(--f);
  background:var(--bg); color:var(--t1);
  /* Tipografia fluida — escala entre 14px (mobile) e 15px (desktop) */
  font-size:clamp(13px, 1.2vw + 10px, 15px);
  line-height:1.65;
  overflow-x:hidden;
}

/* ── 2. LAYOUT ────────────────────────────────────────────────── */

/* Topbar */
.topbar{
  background:var(--bg2);
  border-bottom:2px solid rgba(0,212,255,0.15);
  display:flex; align-items:center;
  padding:0 10px; position:sticky; top:0; z-index:200;
  min-height:48px;
  box-shadow:var(--shadow);
}
.light .topbar{
  border-bottom-color:rgba(0,153,204,0.2);
}

.brand{
  font-family:var(--fm); font-size:12px; color:var(--p);
  white-space:nowrap; padding-right:10px;
  border-right:1px solid var(--bd);
  margin-right:2px; font-weight:600; flex-shrink:0; letter-spacing:.5px;
}

/* Nav desktop */
.nav-desktop{
  display:flex; align-items:center;
  overflow-x:auto; scrollbar-width:none; flex:1; scroll-behavior:smooth;
}
.nav-desktop::-webkit-scrollbar{display:none}
.tgroup{
  font-size:8px; text-transform:uppercase; letter-spacing:1.5px;
  color:rgba(255,255,255,0.28);
  padding:0 4px 0 8px; flex-shrink:0; white-space:nowrap;
}
.light .tgroup{color:rgba(0,0,0,0.3)}

.titem{
  padding:0 8px; height:48px; display:flex; align-items:center;
  cursor:pointer; font-size:12px; color:var(--t2);
  white-space:nowrap; border-bottom:2px solid transparent;
  font-weight:500; flex-shrink:0;
}
.titem:hover{color:var(--t1);background:rgba(255,255,255,0.04)}
.titem.active{color:var(--t1);border-bottom-color:var(--p);background:rgba(0,212,255,0.07)}
.light .titem:hover{background:rgba(0,0,0,0.04)}
.light .titem.active{background:rgba(0,153,204,0.08)}

/* Setas de scroll do nav */
.nav-arrow{
  background:none; border:none; color:var(--t3); cursor:pointer;
  padding:0 4px; height:48px; font-size:16px;
  flex-shrink:0; display:none;
}
.nav-arrow:hover{color:var(--t1)}

/* Botão hambúrguer mobile */
.hamburger{
  display:none; background:none; border:1px solid var(--bd);
  border-radius:6px; color:var(--t2); cursor:pointer;
  padding:6px 9px; margin-left:6px; font-size:15px; line-height:1;
}

/* ── Botão de tema ──────────────────────────────────────────── */
.theme-btn{
  background:none;
  border:1px solid var(--bd);
  border-radius:6px;
  color:var(--t2);
  cursor:pointer;
  padding:6px 9px;
  margin-left:6px;
  font-size:14px;
  line-height:1;
  flex-shrink:0;
}
.theme-btn:hover{color:var(--t1);border-color:var(--p)}

/* Drawer mobile */
.drawer{
  position:fixed; top:0; left:-280px; width:280px; height:100vh;
  background:var(--bg2); border-right:1px solid var(--bd);
  z-index:300; transition:left .25s; overflow-y:auto; padding:16px 0;
  box-shadow:4px 0 20px rgba(0,0,0,0.4);
}
.drawer.open{left:0}
.drawer-overlay{
  position:fixed; inset:0; background:rgba(0,0,0,0.6);
  z-index:299; display:none;
}
.drawer-overlay.open{display:block}
.drawer-brand{
  font-family:var(--fm); font-size:13px; color:var(--p);
  padding:0 16px 14px; border-bottom:1px solid var(--bd);
  margin-bottom:6px; font-weight:600;
}
.drawer-close{float:right;background:none;border:none;color:var(--t3);font-size:18px;cursor:pointer;line-height:1}
.d-group{
  font-size:9px; text-transform:uppercase; letter-spacing:2px;
  color:rgba(255,255,255,0.28); padding:10px 16px 4px;
}
.light .d-group{color:rgba(0,0,0,0.3)}
.d-item{
  padding:11px 16px; cursor:pointer; font-size:14px; color:var(--t2);
  border-left:3px solid transparent; font-weight:500;
}
.d-item:hover{background:rgba(255,255,255,0.04);color:var(--t1)}
.d-item.active{color:var(--p);border-left-color:var(--p);background:rgba(0,212,255,0.06)}
.light .d-item:hover{background:rgba(0,0,0,0.04)}

/* Área de conteúdo */
.content{padding:24px 20px;width:100%;max-width:1100px;margin:0 auto}
.screen{display:none}
.screen.active{display:block}

/* ── 3. TIPOGRAFIA ────────────────────────────────────────────── */
.h1{font-size:clamp(18px, 2.5vw, 26px);font-weight:600;margin-bottom:4px;color:var(--t1)}
.sub{font-size:clamp(10px, 1vw, 12px);color:var(--t3);margin-bottom:22px;font-family:var(--fm)}
.sec{
  font-size:10px;font-weight:600;text-transform:uppercase;
  letter-spacing:2px;color:var(--t3);margin:24px 0 12px;font-family:var(--fm);
}

/* ── 4. GRID E ESPAÇAMENTO ────────────────────────────────────── */
.grid{display:grid;gap:12px}
.g2{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}

/* ── 5. COMPONENTES BASE ──────────────────────────────────────── */

/* Card genérico */
.card{background:var(--bg3);border:1px solid var(--bd);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.card.click{cursor:pointer}
.card.click:hover{border-color:var(--p);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,212,255,0.12)}
.sc{font-size:10px;text-transform:uppercase;letter-spacing:1.5px;color:var(--t3);margin-bottom:6px;font-family:var(--fm)}
.sv{font-size:26px;font-weight:600;color:var(--p);font-family:var(--fm)}
.ss{font-size:11px;color:var(--t3);margin-top:3px}
.mn{font-size:10px;font-family:var(--fm);color:var(--t3);margin-bottom:4px}
.mt{font-size:14px;font-weight:600;margin-bottom:8px}
.pb{height:3px;background:rgba(255,255,255,0.07);border-radius:2px;margin-top:6px;overflow:hidden}
.light .pb{background:rgba(0,0,0,0.07)}
.pf{height:100%;background:var(--p);border-radius:2px}
.ps{font-size:11px;color:var(--t3);margin-top:4px;font-family:var(--fm)}

/* Bloco de conteúdo teórico */
.blk{background:var(--bg3);border:1px solid var(--bd);border-radius:var(--radius);padding:18px;margin-bottom:10px;box-shadow:var(--shadow)}
.blk h3{font-size:14px;font-weight:600;color:var(--p);margin-bottom:10px}
.blk p{font-size:13px;color:var(--t2);line-height:1.7;margin-bottom:6px}
.blk ul{list-style:none;padding:0}
.blk li{font-size:13px;color:var(--t2);padding:4px 0 4px 16px;position:relative;line-height:1.6}
.blk li::before{content:"›";position:absolute;left:0;color:var(--p);font-size:15px}

/* Alertas */
.alert{padding:11px 15px;border-radius:8px;font-size:13px;margin:10px 0;line-height:1.6}
.ai{background:rgba(0,212,255,0.06);border:1px solid rgba(0,212,255,0.2);color:var(--p)}
.aw{background:rgba(255,85,102,0.06);border:1px solid rgba(255,85,102,0.2);color:#ff7080}
.ag{background:rgba(0,255,157,0.06);border:1px solid rgba(0,255,157,0.2);color:var(--g)}
.ay{background:rgba(255,192,64,0.06);border:1px solid rgba(255,192,64,0.2);color:var(--y)}
.light .aw{color:var(--r)}
.light .ag{color:var(--g)}
.light .ay{color:var(--y)}

/* Highlight boxes */
.hl{border-radius:9px;padding:14px 16px;margin-bottom:8px}
.hl-p{background:rgba(0,212,255,0.05);border:1px solid rgba(0,212,255,0.18)}
.hl-g{background:rgba(0,255,157,0.05);border:1px solid rgba(0,255,157,0.18)}
.hl-y{background:rgba(255,192,64,0.05);border:1px solid rgba(255,192,64,0.18)}
.hl-pu{background:rgba(192,132,255,0.05);border:1px solid rgba(192,132,255,0.18)}
.hl-hdr{font-size:13px;font-weight:600;margin-bottom:5px}
.hl-p .hl-hdr{color:var(--p)} .hl-g .hl-hdr{color:var(--g)}
.hl-y .hl-hdr{color:var(--y)} .hl-pu .hl-hdr{color:var(--pu)}
.hl p{font-size:13px;color:var(--t2);line-height:1.65}

/* Expanders */
.xb{
  background:var(--bg4); border:1px solid var(--bd); border-radius:8px;
  padding:13px 15px; margin-bottom:7px; cursor:pointer;
}
.xb:hover{border-color:rgba(255,255,255,0.15)}
.light .xb:hover{border-color:rgba(0,0,0,0.18)}
.xh{display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:500;color:var(--t2)}
.xa{font-size:11px;color:var(--t3);transition:transform .2s}
.xb.open .xa{transform:rotate(90deg)}
.xbody{display:none;margin-top:11px;font-size:13px;color:var(--t3);line-height:1.7}
.xb.open .xbody{display:block}

/* Tabelas */
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th{
  background:rgba(0,212,255,0.08); color:var(--p); padding:9px 10px;
  text-align:left; font-weight:600; font-size:11px;
  text-transform:uppercase; letter-spacing:.8px; font-family:var(--fm);
}
.light .tbl th{background:rgba(0,153,204,0.08)}
.tbl td{padding:9px 10px;border-bottom:1px solid var(--bd);color:var(--t2);font-size:13px}
.tbl tr:last-child td{border:none}
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin-bottom:4px;border-radius:6px}
.tbl-wrap .tbl{min-width:480px}

/* ── 6. BOTÕES ────────────────────────────────────────────────── */
.btn{
  padding:9px 16px; border:1px solid rgba(255,255,255,0.15);
  border-radius:7px; background:transparent; color:var(--t2);
  font-size:13px; cursor:pointer;
  font-family:var(--f); touch-action:manipulation;
}
.btn:hover{background:rgba(255,255,255,0.06);color:var(--t1)}
.light .btn{border-color:rgba(0,0,0,0.15)}
.light .btn:hover{background:rgba(0,0,0,0.05);color:var(--t1)}
.btn-p{border-color:rgba(0,212,255,0.4);color:var(--p)}   .btn-p:hover{background:rgba(0,212,255,0.1)}
.btn-g{border-color:rgba(0,255,157,0.4);color:var(--g)}   .btn-g:hover{background:rgba(0,255,157,0.08)}
.btn-y{border-color:rgba(255,192,64,0.4);color:var(--y)}  .btn-y:hover{background:rgba(255,192,64,0.08)}
.btn-r{border-color:rgba(255,85,102,0.35);color:var(--r)} .btn-r:hover{background:rgba(255,85,102,0.08)}
.btn-pu{border-color:rgba(192,132,255,0.4);color:var(--pu)}.btn-pu:hover{background:rgba(192,132,255,0.08)}

/* ── 7. MÓDULOS DE ESTUDO ─────────────────────────────────────── */

/* Formula cards */
.fcard{background:var(--bg3);border:1px solid var(--bd);border-radius:12px;padding:20px;margin-bottom:14px;overflow:hidden;box-shadow:var(--shadow)}
.fcard-top{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}
.fcard-left{flex:1;min-width:200px}
.fcard-right{width:180px;flex-shrink:0}
.fcard-title{font-size:11px;text-transform:uppercase;letter-spacing:1.5px;color:var(--t3);font-family:var(--fm);margin-bottom:10px}
.fcard-formula{
  background:var(--bg); border:1px solid rgba(0,212,255,0.2); border-radius:8px;
  padding:14px 18px; font-family:var(--fm); font-size:20px; font-weight:600;
  margin-bottom:14px; line-height:1.5; letter-spacing:0.5px;
}
.fcard-desc{font-size:12px;color:var(--t2);line-height:1.6;margin-bottom:12px}
.vleg{width:100%;border-collapse:collapse;font-size:12px;margin-top:4px}
.vleg td{padding:6px 8px;border-bottom:1px solid rgba(255,255,255,0.05);vertical-align:top}
.light .vleg td{border-bottom-color:rgba(0,0,0,0.05)}
.vleg tr:last-child td{border:none}
.vleg .vsym{font-family:var(--fm);font-weight:600;font-size:14px;white-space:nowrap;padding-right:10px}
.vleg .vname{color:var(--t1);font-weight:500;white-space:nowrap;padding-right:8px}
.vleg .vunit{color:var(--t3);font-family:var(--fm);font-size:11px;white-space:nowrap;padding-right:8px}
.vleg .vdesc{color:var(--t3);font-size:11px;line-height:1.45}
.fdiag{background:var(--bg4);border:1px solid var(--bd);border-radius:8px;padding:10px;display:flex;align-items:center;justify-content:center}
.fdiag svg{width:100%;height:auto}
.fdiv{height:1px;background:var(--bd);margin:14px 0}
.fapps{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.fapp{background:var(--bg4);border:1px solid var(--bd);border-radius:6px;padding:5px 10px;font-size:11px;color:var(--t2)}

/* Cenários reais */
.scen-card{background:var(--bg3);border:1px solid var(--bd);border-radius:var(--radius);padding:18px;margin-bottom:12px;box-shadow:var(--shadow)}
.scen-hdr{display:flex;justify-content:space-between;align-items:flex-start;cursor:pointer}
.scen-title{font-size:15px;font-weight:600;color:var(--t1)}
.scen-sub{font-size:11px;color:var(--t3);margin-top:3px;font-family:var(--fm)}
.scen-arrow{font-size:13px;color:var(--t3);transition:transform .2s;margin-top:3px}
.scen-card.open .scen-arrow{transform:rotate(90deg)}
.scen-body{display:none;margin-top:14px}
.scen-card.open .scen-body{display:block}
.scen-vars{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}
.var-pill{padding:5px 12px;border-radius:20px;font-size:11px;font-family:var(--fm);font-weight:600}
.step{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--bd)}
.step:last-child{border:none}
.step-num{
  width:24px;height:24px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-family:var(--fm);font-weight:600;flex-shrink:0;margin-top:2px;
}
.step-txt{font-size:13px;color:var(--t2);line-height:1.65}
.step-eq{
  font-family:var(--fm);font-size:11px;color:var(--p);
  background:var(--bg);padding:3px 8px;border-radius:4px;
  margin-top:5px;display:inline-block;
}

/* ── 8. PRÁTICA ───────────────────────────────────────────────── */

/* Flashcards */
.fc-wrap{perspective:900px;height:190px;cursor:pointer;margin-bottom:12px}
.fc-inner{width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d;position:relative}
.fc-inner.flip{transform:rotateY(180deg)}
.fc-f,.fc-b{
  position:absolute;width:100%;height:100%;
  backface-visibility:hidden;border-radius:var(--radius);
  padding:20px;display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;
}
.fc-f{background:var(--bg3);border:1px solid var(--bd)}
.fc-b{background:var(--bg4);border:1px solid rgba(0,212,255,0.25);transform:rotateY(180deg)}
.fc-cat{font-size:10px;text-transform:uppercase;letter-spacing:1.5px;color:var(--t3);font-family:var(--fm);margin-bottom:8px}
.fc-q{font-size:15px;font-weight:500;color:var(--t1);line-height:1.45}
.fc-a{font-size:13px;color:var(--t2);line-height:1.55}
.fc-hint{font-size:11px;color:var(--t3);margin-top:10px}
.fc-nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.fc-info{font-size:12px;color:var(--t3);font-family:var(--fm)}
.fc-bar{height:3px;background:var(--bd);border-radius:2px;margin-bottom:14px;overflow:hidden}
.fc-bfill{height:100%;background:var(--p);border-radius:2px;transition:width .3s}
.fc-btns{display:flex;gap:7px;justify-content:center;flex-wrap:wrap;margin-top:10px}

/* Quiz */
.qz-hdr{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px;align-items:center}
.qz-box{background:var(--bg3);border:1px solid var(--bd);border-radius:var(--radius);padding:18px;margin-bottom:14px;box-shadow:var(--shadow)}
.qz-meta{font-size:11px;color:var(--t3);font-family:var(--fm);margin-bottom:10px}
.qz-q{font-size:15px;font-weight:500;line-height:1.55;margin-bottom:14px;color:var(--t1)}
.qz-opt{
  padding:12px 14px;border:1px solid rgba(255,255,255,0.1);
  border-radius:8px;margin-bottom:8px;cursor:pointer;
  font-size:13px;color:var(--t2);
  display:flex;gap:10px;align-items:flex-start;
}
.light .qz-opt{border-color:rgba(0,0,0,0.1)}
.qz-opt:hover:not(.dis){border-color:var(--p);background:rgba(0,212,255,0.05);color:var(--t1)}
.qz-opt.ok{border-color:var(--g);background:rgba(0,255,157,0.06);color:var(--g);pointer-events:none}
.qz-opt.err{border-color:var(--r);background:rgba(255,85,102,0.06);color:var(--r);pointer-events:none}
.qz-opt.dis{pointer-events:none}
.qz-ltr{font-family:var(--fm);font-size:11px;color:var(--t3);min-width:16px;margin-top:1px}
.qz-fb{padding:11px 14px;border-radius:8px;font-size:13px;margin-top:10px;line-height:1.65}
.fb-ok{background:rgba(0,255,157,0.06);border:1px solid rgba(0,255,157,0.18);color:var(--g)}
.fb-err{background:rgba(255,85,102,0.06);border:1px solid rgba(255,85,102,0.18);color:#ff7080}
.light .fb-err{color:var(--r)}
.score-wrap{text-align:center;padding:32px;background:var(--bg3);border-radius:var(--radius)}
.score-big{font-size:52px;font-weight:600;color:var(--p);font-family:var(--fm)}

/* Calculadora */
.cb-calc{background:var(--bg3);border:1px solid var(--bd);border-radius:var(--radius);padding:16px;margin-bottom:10px;box-shadow:var(--shadow)}
.calc-label{font-size:10px;text-transform:uppercase;letter-spacing:1.5px;color:var(--t3);font-family:var(--fm);margin-bottom:5px}
.calc-eq{font-family:var(--fm);font-size:14px;color:var(--p);margin-bottom:12px}
.inp-row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end;margin-bottom:10px}
.ig{display:flex;flex-direction:column;gap:4px}
.ig label{font-size:11px;color:var(--t3);font-family:var(--fm)}
.ig input{
  background:var(--bg);border:1px solid rgba(255,255,255,0.12);
  border-radius:6px;padding:9px 10px;color:var(--t1);font-size:13px;
  width:110px;font-family:var(--fm);
}
.light .ig input{border-color:rgba(0,0,0,0.12);background:var(--bg4)}
.ig input:focus{outline:none;border-color:var(--p)}
.res{
  background:rgba(0,212,255,0.06);border:1px solid rgba(0,212,255,0.18);
  border-radius:7px;padding:10px 14px;font-family:var(--fm);font-size:13px;color:var(--p);
}

/* ── 9. SIMULADORES ───────────────────────────────────────────── */
.sim-input{
  background:var(--bg); border-radius:6px;
  padding:10px 12px; color:var(--t1); font-size:15px;
  width:100%; font-family:var(--fm);
}
.sim-input-p{border:1px solid rgba(0,212,255,0.3)}
.sim-input-g{border:1px solid rgba(0,255,157,0.3)}
.sim-input-n{border:1px solid rgba(255,255,255,0.1)}
.light .sim-input-n{border-color:rgba(0,0,0,0.1)}

/* ── 10. UTILITÁRIOS ──────────────────────────────────────────── */
.lst{list-style:none;padding:0}
.lbl{font-size:11px;color:var(--t3);display:block;margin-bottom:3px}
.mcard{background:var(--bg3);border-radius:5px;padding:8px;text-align:center}
.mlbl{font-size:9px;color:var(--t3)}

/* ── 12. RESPONSIVO ───────────────────────────────────────────── */

/* Mobile (≤ 900px) */
@media(max-width:900px){
  .nav-desktop{display:none}
  .nav-arrow{display:none!important}
  .hamburger{display:flex;align-items:center;margin-left:auto}

  .content{padding:12px 10px}
  .h1{font-size:clamp(16px,5vw,20px)}
  .sub{font-size:11px}
  .blk{padding:14px}

  .fcard-right{display:none}
  .fcard-formula{font-size:14px;padding:10px 11px}
  .vleg td{padding:4px 6px}
  .vleg .vsym{font-size:12px}
  .vleg .vname,.vleg .vunit,.vleg .vdesc{font-size:10px}

  .grid.g4{grid-template-columns:repeat(2,1fr)}
  .grid.g3{grid-template-columns:1fr 1fr}
  .grid.g2{grid-template-columns:1fr}

  .ig input{width:88px;font-size:12px}
  .qz-opt{font-size:12px;padding:10px 11px}
  .score-big{font-size:38px}
  .xbody{font-size:12px;line-height:1.6}

  .blk .tbl{display:block;width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:normal}
  .blk .tbl th{font-size:10px;padding:7px 8px;min-width:80px}
  .blk .tbl td{font-size:11px;padding:7px 8px;min-width:80px;word-break:break-word}
  .blk .tbl td:first-child,.blk .tbl th:first-child{min-width:110px}

  .hl{padding:10px 12px}
  .hl p{font-size:12px}
}

/* Desktop médio (901–1300px): mostra setas de scroll do nav */
@media(min-width:901px) and (max-width:1300px){
  .nav-arrow{display:flex;align-items:center}
}

/* ═══════════════════════════════════════════════════════════════
   FASE 2 — Fórmulas Visuais interativas + Simuladores melhorados
═══════════════════════════════════════════════════════════════ */

/* ── Variáveis coloridas interativas (fórmula) ── */
.fv{
  cursor:pointer;
  border-radius:3px;
  padding:1px 3px;
  transition:background-color .15s, opacity .15s;
}
.fv-p{color:var(--p)}
.fv-g{color:var(--g)}
.fv-y{color:var(--y)}
.fv-r{color:var(--r)}
.fv-pu{color:var(--pu)}
.fv-or{color:var(--or)}

/* hover da fórmula acende a variável */
.fv:hover{ filter:brightness(1.3) }

/* highlight sincronizado diagrama ↔ legenda */
.fv-hl-p{background:rgba(0,212,255,0.18)!important; outline:1px solid rgba(0,212,255,0.4)}
.fv-hl-g{background:rgba(0,255,157,0.18)!important; outline:1px solid rgba(0,255,157,0.4)}
.fv-hl-y{background:rgba(255,192,64,0.18)!important; outline:1px solid rgba(255,192,64,0.4)}
.fv-hl-r{background:rgba(255,85,102,0.18)!important; outline:1px solid rgba(255,85,102,0.4)}
.fv-hl-pu{background:rgba(192,132,255,0.18)!important; outline:1px solid rgba(192,132,255,0.4)}
.fv-hl-or{background:rgba(255,144,64,0.18)!important; outline:1px solid rgba(255,144,64,0.4)}

/* Linhas da legenda acendem no hover */
.vleg tr[data-var]{cursor:pointer;border-radius:4px}
.vleg tr[data-var]:hover td{background:rgba(255,255,255,0.04)}
.vleg tr.leg-hl td{background:rgba(0,212,255,0.06)!important}

/* ── Botão e bloco de resolução ── */
.fex-btn-row{ margin-top:10px }
.fex-btn{ font-size:12px; padding:7px 14px }

.fsolve{
  display:none;
  margin-top:10px;
  background:var(--bg4);
  border:1px solid var(--bd);
  border-radius:8px;
  padding:14px;
}
.fsolve.open{ display:block }
.fsolve-hdr{
  font-size:11px; color:var(--t3); font-family:var(--fm);
  margin-bottom:10px; padding-bottom:8px;
  border-bottom:1px solid var(--bd);
}
.fsolve-step{
  display:flex; gap:10px; align-items:flex-start;
  padding:7px 0; border-bottom:1px solid rgba(255,255,255,0.04);
  font-size:13px; color:var(--t2); line-height:1.5;
}
.fsolve-step:last-child{ border:none }
.fsolve-res{ background:rgba(0,212,255,0.04); border-radius:6px; padding:8px 10px; margin-top:4px }
.fsolve-num{
  width:20px; height:20px; border-radius:50%;
  background:rgba(0,212,255,0.12); border:1px solid rgba(0,212,255,0.3);
  display:flex; align-items:center; justify-content:center;
  font-size:10px; font-family:var(--fm); font-weight:700; color:var(--p);
  flex-shrink:0; margin-top:1px;
}
.fsolve-eq{
  font-family:var(--fm); font-size:13px; color:var(--p);
  background:var(--bg); padding:2px 7px; border-radius:4px;
  display:inline-block; margin-left:4px;
}

/* Stevin — animação da água */
.stv-water{
  animation: stv-fill 3s ease-in-out infinite alternate;
  transform-origin: bottom;
}
@keyframes stv-fill{
  0%{ opacity:0.8; transform:scaleY(1) }
  100%{ opacity:0.5; transform:scaleY(0.88) }
}
.stv-surface{
  animation: stv-wave 2.5s ease-in-out infinite alternate;
}
@keyframes stv-wave{
  0%{ d: path("M31,50 Q71,44 111,50 Q151,56 149,50") }
  100%{ d: path("M31,52 Q71,58 111,52 Q151,46 149,52") }
}

/* ── Simuladores Fase 2 ── */
.sim-card{
  background:var(--bg3);
  border-radius:12px;
  padding:20px;
  margin-bottom:20px;
  box-shadow:var(--shadow);
}
.sim-card-p{ border:2px solid rgba(0,212,255,0.28) }
.sim-card-g{ border:2px solid rgba(0,255,157,0.28) }

.sim-hdr{
  display:flex; align-items:center; gap:12px; margin-bottom:16px;
}
.sim-badge{
  width:38px; height:38px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--fm); font-size:16px; font-weight:700; flex-shrink:0;
}
.sim-badge-p{ background:rgba(0,212,255,0.14); border:2px solid var(--p); color:var(--p) }
.sim-badge-g{ background:rgba(0,255,157,0.12); border:2px solid var(--g); color:var(--g) }
.sim-title{ font-size:16px; font-weight:600 }
.sim-title-p{ color:var(--p) }
.sim-title-g{ color:var(--g) }
.sim-sub{ font-family:var(--fm); font-size:11px; color:var(--t3); margin-top:2px }

.sim-svg-wrap{
  background:var(--bg4); border:1px solid var(--bd); border-radius:8px;
  padding:10px 12px; margin-bottom:14px; overflow:hidden;
}

.sim-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:12px;
}
.sim-col-lbl{
  font-size:10px; text-transform:uppercase; letter-spacing:1px;
  font-family:var(--fm); margin-bottom:8px; font-weight:600;
}
.sim-col-lbl-p{ color:var(--p) }
.sim-col-lbl-g{ color:var(--g) }

.sim-hint{ font-size:10px; color:var(--t3); margin-bottom:8px; margin-top:3px }

.sim-result-box{
  background:var(--bg); border:1px solid var(--bd);
  border-radius:8px; padding:10px 12px;
}
.sim-result-lbl{ font-size:10px; color:var(--t3); margin-bottom:4px }
.sim-result-val{ font-family:var(--fm); font-size:15px; font-weight:700 }
.sim-result-val-g{ color:var(--g) }
.sim-result-val-p{ color:var(--p) }
.sim-result-sub{ font-family:var(--fm); font-size:11px; color:var(--t3); margin-top:3px }

.sim-err{
  background:rgba(255,85,102,0.08); border:1px solid rgba(255,85,102,0.25);
  border-radius:7px; padding:10px; font-size:12px; color:#ff7080;
  margin-bottom:10px;
}
.sim-alert-ctx{
  border-radius:7px; padding:10px 12px; font-size:12px;
  margin-bottom:10px; line-height:1.55;
}
.sim-alert-warn{
  background:rgba(255,192,64,0.08); border:1px solid rgba(255,192,64,0.3); color:var(--y);
}
.sim-alert-danger{
  background:rgba(255,85,102,0.08); border:1px solid rgba(255,85,102,0.3); color:var(--r);
}
.sim-alert-info{
  background:rgba(0,212,255,0.06); border:1px solid rgba(0,212,255,0.22); color:var(--p);
}

.sim-solve-btn{
  display:block; width:100%; padding:10px; font-size:13px; font-weight:600;
  background:rgba(0,212,255,0.06); border:1px solid rgba(0,212,255,0.2);
  border-radius:8px; color:var(--p); cursor:pointer; margin-bottom:10px;
  text-align:left;
}
.sim-solve-btn-g{
  background:rgba(0,255,157,0.06); border-color:rgba(0,255,157,0.2); color:var(--g);
}
.sim-solve-btn:hover{ filter:brightness(1.15) }

.sim-solve{
  background:var(--bg4); border:1px solid var(--bd); border-radius:8px;
  padding:14px; margin-bottom:12px;
}
.sim-solve-step{
  display:flex; gap:10px; align-items:flex-start;
  padding:9px 0; border-bottom:1px solid rgba(255,255,255,0.04);
  font-size:13px; color:var(--t2); line-height:1.55;
}
.sim-solve-step:last-child{ border:none }
.sim-solve-num{
  width:22px; height:22px; border-radius:50%; flex-shrink:0; margin-top:1px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--fm); font-size:11px; font-weight:700;
}
.sim-solve-num-p{ background:rgba(0,212,255,0.14); border:1px solid rgba(0,212,255,0.35); color:var(--p) }
.sim-solve-num-g{ background:rgba(0,255,157,0.12); border:1px solid rgba(0,255,157,0.35); color:var(--g) }
.sim-val-box{
  display:grid; gap:6px; margin:6px 0;
}
.sim-val-card{
  background:var(--bg3); border-radius:6px; padding:8px 10px; text-align:center;
}
.sim-val-lbl{ font-size:9px; color:var(--t3); margin-bottom:3px }
.sim-val-num{ font-size:14px; font-weight:600; font-family:var(--fm) }
.sim-eq-box{
  background:var(--bg); border:1px solid rgba(0,212,255,0.18);
  border-radius:6px; padding:9px 12px; font-size:13px;
  font-family:var(--fm); color:var(--t2); margin:5px 0; line-height:1.7;
}
.sim-eq-box-g{ border-color:rgba(0,255,157,0.18) }
.sim-res-final{
  background:rgba(0,255,157,0.07); border:1px solid rgba(0,255,157,0.3);
  border-radius:8px; padding:12px; display:flex;
  justify-content:space-between; align-items:center; flex-wrap:wrap; gap:8px;
}
.sim-res-final-p{ background:rgba(0,212,255,0.07); border-color:rgba(0,212,255,0.3) }
.sim-res-label{ font-size:13px; color:var(--t2) }
.sim-res-value{ font-size:22px; font-weight:700; font-family:var(--fm); color:var(--g) }
.sim-res-value-p{ color:var(--p) }
.sim-res-sub{ font-size:11px; color:var(--t3) }
.sim-dp-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:6px; margin-top:8px;
}
.sim-dp-cell{
  background:var(--bg3); border-radius:6px; padding:9px; text-align:center;
}
.sim-dp-lbl{ font-size:10px; color:var(--t3); margin-bottom:3px }
.sim-dp-val{ font-size:14px; font-weight:600; font-family:var(--fm) }

.sim-actions{ display:flex; justify-content:flex-end; margin-top:4px }

/* Exemplos prontos */
.sim-ex-card{
  background:var(--bg4); border:1px solid var(--bd);
  border-radius:8px; padding:12px; cursor:pointer;
}
.sim-ex-card:hover{ border-color:var(--p); transform:translateY(-2px); box-shadow:0 4px 14px rgba(0,212,255,0.1) }
.sim-ex-title{ font-size:11px; font-weight:600; margin-bottom:4px }
.sim-ex-desc{ font-size:10px; color:var(--t3); line-height:1.6 }

/* Mobile Fase 2 */
@media(max-width:900px){
  .sim-grid{ grid-template-columns:1fr }
  .sim-svg-wrap svg{ max-height:90px }
  .fcard-right{ display:block }
}

/* ── Changelog / Timeline ─────────────────────────────────────── */
.cl-entry{
  display:flex; gap:16px; margin-bottom:0;
  padding-left:4px;
  position:relative;
}
.cl-entry:not(.cl-entry-last)::before{
  content:'';
  position:absolute;
  left:11px; top:28px; bottom:0;
  width:2px;
  background:var(--bd);
}
.cl-dot{
  width:22px; height:22px; border-radius:50%;
  flex-shrink:0; margin-top:4px;
  border:2px solid; position:relative; z-index:1;
}
.cl-dot-p{ background:rgba(0,212,255,0.15); border-color:var(--p) }
.cl-dot-g{ background:rgba(0,255,157,0.15); border-color:var(--g) }
.cl-dot-y{ background:rgba(255,192,64,0.15); border-color:var(--y) }

.cl-body{
  flex:1;
  background:var(--bg3); border:1px solid var(--bd);
  border-radius:var(--radius); padding:16px 18px;
  margin-bottom:16px;
  box-shadow:var(--shadow);
}
.cl-header{
  display:flex; align-items:center; gap:10px;
  flex-wrap:wrap; margin-bottom:12px;
}
.cl-tag{
  font-size:10px; font-weight:700; font-family:var(--fm);
  padding:3px 9px; border-radius:20px; letter-spacing:.5px;
}
.cl-tag-p{ background:rgba(0,212,255,0.12); color:var(--p); border:1px solid rgba(0,212,255,0.3) }
.cl-tag-g{ background:rgba(0,255,157,0.12); color:var(--g); border:1px solid rgba(0,255,157,0.3) }
.cl-tag-y{ background:rgba(255,192,64,0.12); color:var(--y); border:1px solid rgba(255,192,64,0.3) }

.cl-title{ font-size:15px; font-weight:600; color:var(--t1); flex:1 }
.cl-date{ font-size:11px; color:var(--t3); font-family:var(--fm) }

.cl-section{
  font-size:10px; font-weight:600; text-transform:uppercase;
  letter-spacing:1.8px; color:var(--t3); font-family:var(--fm);
  margin:12px 0 6px;
}
.cl-body > .cl-section:first-of-type{ margin-top:0 }

.cl-list{
  list-style:none; padding:0; margin:0 0 4px;
}
.cl-list li{
  font-size:13px; color:var(--t2); line-height:1.65;
  padding:4px 0 4px 18px; position:relative;
  border-bottom:1px solid rgba(255,255,255,0.03);
}
.cl-list li:last-child{ border:none }
.cl-list li::before{
  content:'›'; position:absolute; left:0;
  color:var(--p); font-size:14px; top:4px;
}
.cl-list code{
  font-family:var(--fm); font-size:12px;
  background:var(--bg4); padding:1px 5px; border-radius:3px;
  color:var(--p);
}

/* ═══════════════════════════════════════════════════════════════
   FASE 3 — Conteúdo: analogias, mapa de variáveis, cotidiano
═══════════════════════════════════════════════════════════════ */

/* Caixa de analogia dentro do hl */
.analogy-box{
  margin-top:8px; padding:8px 10px;
  background:var(--bg); border-radius:6px;
  font-size:12px; color:var(--t2); line-height:1.55;
  border-left:3px solid rgba(255,255,255,0.12);
}

/* Mapa de variáveis */
.varmap-card{
  border-radius:var(--radius); padding:14px 16px;
  border:1px solid var(--bd); background:var(--bg4);
}
.varmap-p{ border-color:rgba(0,212,255,0.25) }
.varmap-g{ border-color:rgba(0,255,157,0.25) }
.varmap-y{ border-color:rgba(255,192,64,0.25) }
.varmap-pu{ border-color:rgba(192,132,255,0.25) }
.varmap-icon{
  font-size:22px; margin-bottom:6px;
}
.varmap-name{
  font-size:14px; font-weight:600; color:var(--t1); margin-bottom:6px;
}
.varmap-p .varmap-name{ color:var(--p) }
.varmap-g .varmap-name{ color:var(--g) }
.varmap-y .varmap-name{ color:var(--y) }
.varmap-pu .varmap-name{ color:var(--pu) }
.varmap-where{
  font-size:11px; color:var(--t3); line-height:1.5; margin-bottom:4px;
}
.varmap-where::before{ content:'📍 '; }
.varmap-why{
  font-size:11px; color:var(--t2); line-height:1.5;
}
.varmap-why::before{ content:'💡 '; }

/* Cards "Você já viu isso" */
.everyday-card{
  background:var(--bg3); border:1px solid var(--bd);
  border-radius:var(--radius); padding:16px;
  box-shadow:var(--shadow);
}
.everyday-p{ border-top:3px solid var(--p) }
.everyday-g{ border-top:3px solid var(--g) }
.everyday-y{ border-top:3px solid var(--y) }
.everyday-pu{ border-top:3px solid var(--pu) }
.everyday-icon{ font-size:26px; margin-bottom:6px }
.everyday-title{
  font-size:13px; font-weight:600; color:var(--t1);
  margin-bottom:8px;
}
.everyday-body{
  font-size:12px; color:var(--t2); line-height:1.65;
}

/* ═══════════════════════════════════════════════════════════════
   FASE 4 — Dashboard + Seletor Bernoulli
═══════════════════════════════════════════════════════════════ */

/* Dashboard stat cards clickáveis */
.dash-stat{ cursor:pointer }
.dash-stat:hover{ border-color:var(--p); transform:translateY(-2px); box-shadow:0 6px 20px rgba(0,212,255,0.12) }

/* Acesso rápido */
.dash-quick{
  display:flex; gap:8px; flex-wrap:wrap; margin-bottom:20px;
}
.dash-qbtn{
  padding:8px 16px; border-radius:8px; font-size:13px; font-weight:500;
  cursor:pointer; border:1px solid var(--bd); background:var(--bg4);
  color:var(--t2); font-family:var(--f);
}
.dash-qbtn:hover{ transform:translateY(-1px); box-shadow:0 3px 10px rgba(0,0,0,0.3) }
.dash-qbtn-p{ border-color:rgba(0,212,255,0.35); color:var(--p); background:rgba(0,212,255,0.06) }
.dash-qbtn-g{ border-color:rgba(0,255,157,0.35); color:var(--g); background:rgba(0,255,157,0.06) }
.dash-qbtn-y{ border-color:rgba(255,192,64,0.35); color:var(--y); background:rgba(255,192,64,0.06) }
.dash-qbtn-pu{ border-color:rgba(192,132,255,0.35); color:var(--pu); background:rgba(192,132,255,0.06) }

/* Seletor de variável desconhecida — Bernoulli */
.bern-solve-for{
  display:flex; align-items:center; gap:10px; flex-wrap:wrap;
  background:var(--bg4); border:1px solid var(--bd);
  border-radius:8px; padding:10px 14px; margin-bottom:14px;
}
.bern-sf-lbl{
  font-size:11px; font-weight:600; text-transform:uppercase;
  letter-spacing:1.5px; color:var(--t3); font-family:var(--fm);
  white-space:nowrap;
}
.bern-sf-btns{ display:flex; gap:6px; flex-wrap:wrap; flex:1 }
.bern-sf-btn{
  padding:7px 14px; border-radius:7px;
  border:1px solid var(--bd); background:var(--bg3);
  color:var(--t2); cursor:pointer; font-size:13px; font-weight:500;
  font-family:var(--f); display:flex; flex-direction:column;
  align-items:center; gap:1px;
}
.bern-sf-btn:hover{ border-color:var(--g); color:var(--t1) }
.bern-sf-btn.bsf-active{
  background:rgba(0,255,157,0.1); border-color:var(--g);
  color:var(--g); font-weight:700;
}
.bern-sf-sub{
  font-size:9px; color:var(--t3); font-family:var(--fm);
  font-weight:400; letter-spacing:.3px;
}
.bern-sf-btn.bsf-active .bern-sf-sub{ color:var(--g); opacity:.7 }

/* Mobile ajustes fase 4 */
@media(max-width:900px){
  .dash-quick{ gap:6px }
  .dash-qbtn{ padding:7px 12px; font-size:12px }
  .bern-sf-btns{ gap:5px }
  .bern-sf-btn{ padding:6px 10px; font-size:12px }
}

/* ── Dashboard tools row (Fase 4.1) ──────────────────────────── */
.dash-tools{
  display:flex; flex-direction:column; gap:8px; margin-bottom:4px;
}
.dash-tool{
  display:flex; align-items:center; gap:14px;
  background:var(--bg3); border:1px solid var(--bd);
  border-radius:var(--radius); padding:14px 16px;
  cursor:pointer; box-shadow:var(--shadow);
  border-left:3px solid var(--bd);
}
.dash-tool:hover{ transform:translateX(3px); box-shadow:0 4px 16px rgba(0,0,0,0.3) }
.dash-tool-p { border-left-color:var(--p) }
.dash-tool-g { border-left-color:var(--g) }
.dash-tool-r { border-left-color:var(--r) }
.dash-tool-p2{ border-left-color:var(--p); opacity:.85 }
.dash-tool-icon{ font-size:22px; flex-shrink:0; width:32px; text-align:center }
.dash-tool-body{ flex:1 }
.dash-tool-title{
  font-size:14px; font-weight:600; color:var(--t1); margin-bottom:2px;
}
.dash-tool-p .dash-tool-title{ color:var(--p) }
.dash-tool-g .dash-tool-title{ color:var(--g) }
.dash-tool-r .dash-tool-title{ color:var(--r) }
.dash-tool-sub{ font-size:12px; color:var(--t3) }
.dash-tool-arrow{
  font-size:20px; color:var(--t3); flex-shrink:0;
  transition:transform .15s;
}
.dash-tool:hover .dash-tool-arrow{ transform:translateX(4px); color:var(--t1) }

/* Variáveis com border-left no dashboard */
.card.click[style*="border-left"]{
  border-top:1px solid var(--bd);
  border-right:1px solid var(--bd);
  border-bottom:1px solid var(--bd);
}

/* ── Bernoulli resultado full-width (Fase 4.1) ───────────────── */
.bern-result-bar{
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
  background:rgba(0,255,157,0.06);
  border:2px solid rgba(0,255,157,0.3);
  border-radius:10px; padding:14px 18px;
  margin-bottom:12px;
}
.bern-result-lbl{
  font-size:11px; text-transform:uppercase; letter-spacing:1.5px;
  color:var(--t3); font-family:var(--fm); white-space:nowrap;
}
.bern-result-val{
  font-family:var(--fm); font-size:22px; font-weight:700;
  color:var(--g); flex:1; text-align:center;
}
.bern-result-sub{
  font-size:13px; color:var(--t3); font-family:var(--fm);
  white-space:nowrap;
}
/* Cor da barra muda conforme a variável alvo */
.bern-result-bar.target-s1{
  background:rgba(0,212,255,0.06);
  border-color:rgba(0,212,255,0.3);
}
.bern-result-bar.target-s1 .bern-result-val{ color:var(--p) }

/* Mobile */
@media(max-width:900px){
  .dash-tool{ padding:11px 12px; gap:10px }
  .dash-tool-title{ font-size:13px }
  .dash-tool-icon{ font-size:18px; width:24px }
  .bern-result-val{ font-size:18px }
}

/* ── Passo a passo expandido — método + dica (v5.6) ─────────── */
.fsolve-method{
  background:rgba(0,212,255,0.05);
  border:1px solid rgba(0,212,255,0.18);
  border-radius:8px;
  padding:10px 14px;
  margin-bottom:12px;
}
.fsolve-method-title{
  font-size:11px;font-weight:700;
  color:var(--p);letter-spacing:.8px;
  text-transform:uppercase;margin-bottom:8px;
}
.fsolve-method-steps{ display:flex;flex-direction:column;gap:5px }
.fsolve-mstep{
  display:flex;align-items:flex-start;gap:8px;
  font-size:12px;color:var(--t2);line-height:1.5;
}
.fsolve-mbadge{
  background:rgba(0,212,255,0.15);
  color:var(--p);border-radius:50%;
  width:18px;height:18px;min-width:18px;
  display:flex;align-items:center;justify-content:center;
  font-size:10px;font-weight:700;margin-top:1px;
}
/* Segundo header de exemplo dentro do fsolve */
.fsolve-hdr + .fsolve-hdr,
.fsolve-step + .fsolve-hdr,
.fsolve-step.fsolve-res + .fsolve-hdr{
  border-top:1px solid var(--bd);
  padding-top:8px;
}
/* Dica de armadilha */
.fsolve-tip{
  margin-top:10px;
  background:rgba(255,192,64,0.07);
  border-left:3px solid var(--y);
  border-radius:0 6px 6px 0;
  padding:8px 12px;
  font-size:12px;color:var(--t2);
  line-height:1.5;
}
.fsolve-tip strong,.fsolve-tip b{ color:var(--y) }

@media(max-width:900px){
  .fsolve-method{ padding:8px 10px }
  .fsolve-mstep{ font-size:11px }
}