/* ============================================================
   VERTCA — Sistema de calculadoras NATIVAS (design tokens + layout)
   Identidade dark-tech (grafite + ciano). Compartilhado por todas as ferramentas.
   ★ REBRAND Arqpedia→Vertca: os NOMES das vars são preservados (creme/terracota) para não quebrar
   nenhuma tela; só os VALORES mudam para a paleta escura. --cream=fundo, --paper=card elevado,
   --ink=tinta gelo, --terracota=ciano primário, --accent=lima. Contraste AA garantido sobre o grafite.
   ============================================================ */
:root{
  /* superfícies (grafite frio com profundidade em camadas) */
  --cream:#0a0e17;--cream-2:#111826;--cream-3:#18212f;--paper:#0e1524;
  /* tinta */
  --ink:#eaf1f9;--ink-2:#a6b4c6;--warm:#8394a8;--warm-2:#6f8298;
  /* ciano Vertca (primária) + lima (spark) */
  --terracota:#22d3ee;--terracota-2:#67e8f9;--terracota-3:#0b2a33;--accent:#a3e635;
  /* veredito */
  --good:#34d399;--warn:#fbbf24;--bad:#fb7185;
  /* linhas / profundidade / brilho */
  --line:rgba(148,180,214,.12);--line-2:rgba(148,180,214,.22);
  --shadow:0 2px 6px rgba(0,0,0,.45),0 22px 48px -26px rgba(0,0,0,.85);
  --glow:0 0 24px -6px rgba(34,211,238,.55);--ring:0 0 0 3px rgba(34,211,238,.28);
  --grad-cyan:linear-gradient(135deg,#22d3ee,#0891b2);
  --serif:'Fraunces',Georgia,serif;--sans:'Inter Tight',-apple-system,BlinkMacSystemFont,system-ui,sans-serif;--mono:'JetBrains Mono',ui-monospace,monospace}
/* a11y sobre grafite #0a0e17: --ink #eaf1f9 = 16,7:1 · --terracota #22d3ee = 10,4:1 · --warm #8394a8 = 6,0:1 (AA ok). */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{font-family:var(--sans);background:var(--cream);color:var(--ink);line-height:1.6;letter-spacing:-.011em;display:flex;flex-direction:column;min-height:100vh}
a{color:inherit;text-decoration:none;transition:color .15s}
.container{max-width:1080px;margin:0 auto;padding:0 24px;width:100%}
.topbar{background:var(--ink);color:var(--cream);padding:10px 0;text-align:center;font-size:.8125rem}
.topbar a{display:inline-flex;align-items:center;gap:10px;color:var(--cream)}
.topbar em{color:var(--terracota);font-family:var(--serif);font-style:italic;font-weight:500}
.header{background:color-mix(in srgb,var(--cream) 90%,transparent);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:62px;gap:20px}
.logo img{height:40px;width:auto;display:block}
.nav{display:flex;gap:22px}
.nav a{font-size:.875rem;color:var(--warm);font-weight:450}
.nav a:hover{color:var(--ink)}
@media(max-width:820px){.nav{display:none}}
main{flex:1;padding:32px 0 56px}
.breadcrumbs{font-size:.8rem;color:var(--warm-2);margin-bottom:16px;display:flex;gap:7px;flex-wrap:wrap}
.breadcrumbs a{color:var(--warm-2);text-decoration:underline;text-underline-offset:2px}
.breadcrumbs a:hover{color:var(--terracota-2)}
.eyebrow{font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--terracota-2);margin-bottom:12px}
h1{font-family:var(--serif);font-weight:400;font-variation-settings:'opsz' 144,'SOFT' 40;font-size:clamp(2rem,4.5vw,3.1rem);line-height:1.04;letter-spacing:-.025em;margin-bottom:14px}
.lede{font-size:1.0625rem;color:var(--warm);max-width:660px;margin-bottom:34px}
.lede strong{color:var(--ink)}
.app{display:grid;grid-template-columns:1fr .9fr;gap:22px;align-items:start;margin-bottom:18px}
@media(max-width:820px){.app{grid-template-columns:1fr}}
.panel{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}
.panel-h{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--warm-2);margin-bottom:16px;display:flex;align-items:center;gap:8px}
.panel-h b{width:22px;height:22px;border-radius:7px;background:var(--terracota-3);color:var(--terracota-2);display:inline-flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:.72rem;font-weight:600}
.shapes{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.shape{border:1px solid var(--line-2);background:transparent;color:var(--warm);font-family:var(--sans);font-size:.85rem;font-weight:500;padding:8px 15px;border-radius:999px;cursor:pointer;transition:all .15s;display:inline-flex;align-items:center;gap:6px}
.shape:hover{border-color:var(--terracota);color:var(--ink)}
.shape.on{background:var(--ink);border-color:var(--ink);color:var(--cream)}
.shape .ic{font-size:.95rem;line-height:1}
.field{margin-bottom:15px}
.field label{display:block;font-size:.8rem;font-weight:500;color:var(--warm);margin-bottom:7px}
.field .hint{color:var(--warm-2);font-weight:400}
.inp{width:100%;font-family:var(--sans);font-size:1.05rem;color:var(--ink);background:var(--cream);border:1px solid var(--line-2);border-radius:11px;padding:13px 14px;transition:border-color .15s,box-shadow .15s}
.inp:focus{outline:0;border-color:var(--terracota);box-shadow:0 0 0 3px color-mix(in srgb,var(--terracota) 18%,transparent)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:13px}
select.inp{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%238b8275' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:38px}
.margin-row{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:4px}
.margin-row input[type=range]{flex:1;accent-color:var(--terracota)}
.margin-val{font-family:var(--mono);font-size:.9rem;color:var(--terracota-2);font-weight:600;min-width:42px;text-align:right}
.result{position:sticky;top:80px}
.res-vol{text-align:center;padding:6px 0 20px;border-bottom:1px solid var(--line);margin-bottom:14px}
.res-vol .lbl{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--warm-2);margin-bottom:6px}
.res-vol .val{font-family:var(--serif);font-weight:400;font-variation-settings:'opsz' 144,'SOFT' 30;font-size:3rem;letter-spacing:-.03em;color:var(--terracota-2);line-height:1}
.res-vol .val small{font-size:1.2rem;color:var(--warm);font-family:var(--sans);letter-spacing:0}
.res-vol .sub{font-size:.8rem;color:var(--warm-2);margin-top:6px}
.mat{display:flex;align-items:center;gap:13px;padding:12px 2px;border-bottom:1px solid var(--line)}
.mat:last-of-type{border-bottom:0}
.mat .mi{width:38px;height:38px;border-radius:10px;background:var(--cream-2);display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.mat .mk{flex:1;font-size:.92rem;color:var(--warm)}
.mat .mk small{display:block;font-size:.72rem;color:var(--warm-2)}
.mat .mv{font-family:var(--mono);font-weight:600;font-size:1.08rem;color:var(--ink);text-align:right}
.mat .mv small{font-size:.72rem;color:var(--warm-2);font-weight:400}
.copy-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;margin-top:16px;border:1px solid var(--line-2);background:transparent;color:var(--ink);font-family:var(--sans);font-size:.875rem;font-weight:500;padding:11px;border-radius:11px;cursor:pointer;transition:all .15s}
.copy-btn:hover{border-color:var(--terracota);color:var(--terracota-2)}
.copy-btn svg{width:15px;height:15px}
.res-empty{color:var(--warm-2);font-style:italic;font-family:var(--serif);text-align:center;padding:38px 10px;line-height:1.5}
.tbl-wrap{margin:26px 0 8px;overflow-x:auto}
.tbl-cap{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--warm-2);margin-bottom:12px}
.traco-table{width:100%;border-collapse:collapse;font-size:.88rem;min-width:520px}
.traco-table th,.traco-table td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line)}
.traco-table th{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--warm-2);font-weight:500}
.traco-table td{font-family:var(--mono);font-size:.85rem;color:var(--ink-2)}
.traco-table tr td:first-child{font-weight:600;color:var(--terracota-2)}
.traco-table tr.hl td{background:var(--terracota-3)}
.prose{max-width:720px;margin:46px auto 0;font-size:1.0625rem;color:var(--ink-2)}
.prose h2{font-family:var(--serif);font-weight:500;font-size:1.6rem;letter-spacing:-.02em;margin:40px 0 14px;color:var(--ink)}
.prose h3{font-family:var(--serif);font-weight:500;font-size:1.2rem;margin:26px 0 10px;color:var(--ink)}
.prose p{margin-bottom:16px;line-height:1.72}
.prose ul{margin:0 0 16px 22px}.prose li{margin-bottom:8px}
.prose strong{color:var(--ink)}
.formula{background:var(--cream-2);border-left:3px solid var(--terracota);border-radius:0 11px 11px 0;padding:14px 18px;margin:14px 0;font-family:var(--mono);font-size:.9rem;color:var(--ink)}
.faq{max-width:720px;margin:0 auto}
.faq h2{font-family:var(--serif);font-weight:500;font-size:1.6rem;margin-bottom:8px;text-align:center}
.faq details{border-bottom:1px solid var(--line);padding:16px 2px}
.faq summary{font-family:var(--serif);font-weight:500;font-size:1.1rem;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:12px;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--terracota);font-weight:300;font-size:1.4rem;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq p{margin-top:11px;color:var(--warm);line-height:1.65}
.related{max-width:720px;margin:46px auto 0}
.related h2{font-family:var(--serif);font-weight:500;font-size:1.35rem;margin-bottom:16px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:11px}
.related-grid a{display:block;background:var(--paper);border:1px solid var(--line);border-radius:13px;padding:15px 17px;font-weight:500;font-size:.92rem;color:var(--ink);transition:transform .15s,border-color .15s}
.related-grid a:hover{transform:translateY(-2px);border-color:var(--terracota)}
.related-grid a span{display:block;font-size:.78rem;color:var(--warm-2);font-weight:400;margin-top:3px}
.footer{background:var(--ink);color:var(--cream-3);padding:46px 0 26px;margin-top:60px;font-size:.875rem}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px;border-bottom:1px solid rgba(245,240,230,.1)}
@media(max-width:780px){.footer-top{grid-template-columns:1fr 1fr}}
.footer .logo img{height:38px;filter:brightness(0) invert(1);opacity:.9}
.footer-brand p{color:#9e9486;margin-top:12px;line-height:1.55;max-width:280px}
.footer-col h4{font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:var(--cream-2);margin-bottom:13px}
.footer-col ul{list-style:none}.footer-col li{margin-bottom:8px}
.footer-col a{color:var(--cream-3);opacity:.8}.footer-col a:hover{color:var(--terracota);opacity:1}
.footer-bottom{padding-top:22px;color:#9e9486;text-align:center}
.skip-link{position:absolute;top:-100px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--cream);padding:12px 24px;z-index:9999;border-radius:0 0 12px 12px;font-weight:500}
.skip-link:focus{top:0}
*:focus-visible{outline:2px solid var(--terracota);outline-offset:2px;border-radius:5px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:var(--cream);padding:12px 22px;border-radius:999px;font-size:.875rem;font-weight:500;opacity:0;pointer-events:none;transition:all .25s;z-index:200}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.hl-note{max-width:720px;margin:18px auto 0;font-size:.85rem;color:var(--warm-2);text-align:center;font-style:italic;font-family:var(--serif)}

/* ═══════════════════════════════════════════════════════════════════════════
   ★ VERTCA — camada dark-tech premium (profundidade + vidro + brilho ciano)
   Aplicada por cima dos componentes base; só propriedades VISUAIS (0 mudança de layout).
   ═══════════════════════════════════════════════════════════════════════════ */
html{background:var(--cream)}
body{position:relative}
/* brilho ambiente (ciano no topo, lima na base) */
body::before{content:'';position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(1100px 560px at 82% -10%, rgba(34,211,238,.12), transparent 60%),
    radial-gradient(820px 520px at -8% 108%, rgba(163,230,53,.05), transparent 55%),
    radial-gradient(700px 700px at 50% 120%, rgba(8,145,178,.06), transparent 60%);}
/* malha de engenharia (blueprint) esmaecendo — dá a pegada técnica/estrutural */
body::after{content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.6;
  background-image:linear-gradient(rgba(148,180,214,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(148,180,214,.045) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:radial-gradient(120% 90% at 50% -5%, #000 0%, transparent 72%);
          mask-image:radial-gradient(120% 90% at 50% -5%, #000 0%, transparent 72%);}

/* CARDS em vidro: superfície translúcida + borda-fio + realce superior + sombra profunda */
.card{
  background:linear-gradient(180deg, rgba(148,180,214,.045), rgba(148,180,214,.012)), var(--paper);
  border:1px solid var(--line);
  box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.05);
  -webkit-backdrop-filter:blur(8px); backdrop-filter:blur(8px);
  transition:border-color .18s, box-shadow .18s, transform .18s;}
.card:hover{border-color:rgba(34,211,238,.24)}

/* BOTÃO primário: preenchimento ciano com brilho; ghost/secundário fica em contorno */
.btn:not(.ghost):not(.btn-mini):not(.chip){
  background:var(--grad-cyan); color:#04121a; font-weight:650; border:0;
  box-shadow:0 1px 0 rgba(255,255,255,.25) inset, 0 8px 22px -10px rgba(34,211,238,.7);
  transition:transform .14s, box-shadow .18s, filter .18s;}
.btn:not(.ghost):not(.btn-mini):not(.chip):hover{filter:brightness(1.06);
  box-shadow:0 1px 0 rgba(255,255,255,.3) inset, 0 12px 30px -10px rgba(34,211,238,.85), var(--glow);
  transform:translateY(-1px)}
.btn.ghost{background:transparent;border:1px solid var(--line-2);color:var(--ink)}
.btn.ghost:hover{border-color:var(--terracota);color:var(--terracota);box-shadow:var(--ring)}

/* CAMPOS: fundo escuro real + foco com halo ciano */
input,select,textarea,.inp,.bay{background:rgba(148,180,214,.05);border:1px solid var(--line-2);color:var(--ink)}
input:focus,select:focus,textarea:focus,.inp:focus,.bay:focus{outline:0;border-color:var(--terracota);
  box-shadow:var(--ring), 0 0 18px -6px rgba(34,211,238,.5);background:rgba(34,211,238,.06)}

/* CHIPS / BADGES em vidro ciano-tingido */
.badge,.chip{background:rgba(34,211,238,.10);border:1px solid rgba(34,211,238,.22);color:var(--terracota-2)}

/* detalhes premium: seleção, scrollbar, foco, links */
::selection{background:rgba(34,211,238,.28);color:#fff}
*:focus-visible{outline:2px solid var(--terracota);outline-offset:2px}
a:hover{color:var(--terracota)}
::-webkit-scrollbar{width:12px;height:12px}
::-webkit-scrollbar-track{background:var(--cream)}
::-webkit-scrollbar-thumb{background:linear-gradient(var(--cream-3),var(--cream-2));border:3px solid var(--cream);border-radius:10px}
::-webkit-scrollbar-thumb:hover{background:linear-gradient(#2a3446,#22d3ee)}
/* rodapé escuro coerente (não mais quase-igual ao fundo) */
.footer{background:linear-gradient(180deg,#0c1220,#070a12);border-top:1px solid var(--line)}