/* Physics Lab — site (home e páginas de experimentos). Tema “laboratório à noite”. */
:root {
  --bg: #070b14; --bg2: #0a101d; --card: #0e1626; --card2: #121c30;
  --ink: #e8eef8; --muted: #95a5bd; --dim: #62728c; --line: rgba(148,163,184,.14); --line2: rgba(148,163,184,.24);
  --cyan: #22d3ee; --cyan2: #67e8f9; --amber: #f59e0b; --amber2: #fbbf24; --green: #34d399;
  --display: "Bricolage Grotesque", "IBM Plex Sans", system-ui, sans-serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --r: 18px; --wrap: 1180px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { max-width: 100%; display: block; }
a { color: inherit; }
.mi { font-size: 1.2em; }
.wrap { width: min(var(--wrap), 100% - 32px); margin-inline: auto; }
.narrow { width: min(820px, 100% - 32px); }
.small { font-size: .86rem; color: var(--muted); }
.center { text-align: center; margin-top: 28px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--cyan); color: #04121a; padding: 8px 14px; border-radius: 10px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }

/* ── botões ── */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 999px; font: 600 15px/1 var(--sans); text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform .15s, background .2s, border-color .2s, box-shadow .2s; white-space: nowrap; }
.btn:hover { transform: translateY(-1px); }
.btn-p { background: linear-gradient(135deg, var(--cyan), #06b6d4 55%, #0891b2); color: #03141b; box-shadow: 0 8px 30px -8px rgba(34,211,238,.55), inset 0 1px 0 rgba(255,255,255,.35); }
.btn-p:hover { box-shadow: 0 12px 38px -8px rgba(34,211,238,.75), inset 0 1px 0 rgba(255,255,255,.35); }
.btn-g { background: rgba(255,255,255,.04); border-color: var(--line2); color: var(--ink); }
.btn-g:hover { border-color: var(--cyan); background: rgba(34,211,238,.08); }
.btn.sm { padding: 9px 14px; font-size: 14px; }
.btn.lg { padding: 16px 26px; font-size: 17px; }

/* ── navegação ── */
.nav { position: sticky; top: 0; z-index: 50; backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px); background: rgba(7,11,20,.72); border-bottom: 1px solid var(--line); }
.nav-in { display: flex; align-items: center; gap: 24px; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 700 19px/1 var(--display); letter-spacing: -.01em; text-decoration: none; }
.brand-ic { width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; color: #04121a; background: linear-gradient(135deg, #0891b2, var(--cyan) 60%, var(--amber)); box-shadow: 0 4px 16px rgba(34,211,238,.3); }
.brand-ic .mi { font-size: 22px; }
.nav-links { display: flex; gap: 22px; margin-left: 12px; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--ink); }
.nav-r { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.langs { display: inline-flex; border: 1px solid var(--line2); border-radius: 999px; padding: 3px; }
.langs a { font: 600 12px/1 var(--mono); padding: 7px 9px; border-radius: 999px; text-decoration: none; color: var(--muted); }
.langs a[aria-current] { background: rgba(34,211,238,.14); color: var(--cyan2); }
@media (max-width: 900px) { .nav-links { display: none; } }
@media (max-width: 520px) { .nav-r .btn > span:not(.mi) { display: none; } .nav-r .btn { padding: 9px; } .nav .brand > span:last-child { display: none; } }

/* ── hero ── */
.hero { position: relative; padding: 72px 0 84px; overflow: hidden; isolation: isolate; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -2; background:
  linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 40px 40px,
  linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 40px 40px;
  mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 30%, transparent 75%); -webkit-mask-image: radial-gradient(ellipse 80% 70% at 60% 40%, #000 30%, transparent 75%); opacity: .55; }
.hero::after { content: ""; position: absolute; z-index: -1; width: 900px; height: 900px; right: -260px; top: -320px; background: radial-gradient(circle, rgba(34,211,238,.20), transparent 60%); filter: blur(10px); }
.hero-in { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font: 500 13px/1 var(--mono); letter-spacing: .04em; text-transform: uppercase; color: var(--amber2); background: rgba(245,158,11,.1); border: 1px solid rgba(245,158,11,.28); padding: 8px 12px; border-radius: 999px; }
.eyebrow .mi { font-size: 16px; }
.hero h1 { font: 800 clamp(2.6rem, 6.2vw, 5rem)/1.02 var(--display); letter-spacing: -.035em; margin: 22px 0 22px; }
.hero h1 span { display: block; }
.hero h1 em { font-style: normal; display: block; background: linear-gradient(100deg, var(--cyan2) 0%, var(--cyan) 40%, var(--amber2) 95%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 1.15rem; color: #b8c6da; max-width: 620px; }
.ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; align-items: center; }
.stats { display: grid; grid-template-columns: repeat(4, auto); gap: 8px 32px; margin-top: 40px; justify-content: start; }
.stats div { border-left: 2px solid var(--line2); padding-left: 14px; }
.stats dt { font: 700 2rem/1 var(--display); color: var(--ink); }
.stats dd { font-size: .82rem; color: var(--muted); margin-top: 6px; max-width: 120px; line-height: 1.3; }
.hero-viz { margin: 0; }
.viz-frame { position: relative; aspect-ratio: 1 / 1; border-radius: 26px; background: radial-gradient(120% 90% at 50% 0%, #10203a 0%, #0a1222 55%, #080d18 100%); border: 1px solid var(--line2); box-shadow: 0 40px 90px -30px rgba(0,0,0,.8), inset 0 1px 0 rgba(255,255,255,.06); overflow: hidden; }
.viz-frame canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.viz-hud { position: absolute; left: 16px; right: 16px; bottom: 14px; display: flex; gap: 10px; flex-wrap: wrap; font: 500 12px/1 var(--mono); color: var(--muted); }
.viz-hud span { background: rgba(7,11,20,.7); border: 1px solid var(--line); padding: 7px 10px; border-radius: 8px; }
.viz-hud b { color: var(--cyan2); font-weight: 500; }
.hero-viz figcaption { margin-top: 12px; font: 13px/1.4 var(--mono); color: var(--dim); text-align: center; }
@media (max-width: 960px) { .hero-in { grid-template-columns: 1fr; gap: 40px; } .hero { padding-top: 44px; } .viz-frame { aspect-ratio: 4 / 3; } }
@media (max-width: 560px) { .stats { grid-template-columns: repeat(2, auto); gap: 18px 28px; } .lead { font-size: 1.05rem; } }

/* ── seções ── */
.sec { padding: 96px 0; }
.sec.alt { background: linear-gradient(180deg, var(--bg2), var(--bg)); border-block: 1px solid var(--line); }
.sec-h { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.sec-h.left { text-align: left; margin: 0; }
.sec-h h2, .final h2, .page-h h1 { font: 800 clamp(1.9rem, 3.8vw, 3rem)/1.08 var(--display); letter-spacing: -.03em; }
.sec-h p { color: var(--muted); margin-top: 14px; font-size: 1.08rem; }
@media (max-width: 640px) { .sec { padding: 68px 0; } }

/* áreas */
.fields { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.field { background: linear-gradient(180deg, var(--card), #0b1220); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; transition: border-color .2s, transform .2s; }
.field:hover { border-color: rgba(34,211,238,.4); transform: translateY(-2px); }
.field-h { display: flex; gap: 12px; align-items: center; }
.field-h h3 { font: 700 1.12rem/1.2 var(--display); }
.field-h small { font: 12px var(--mono); color: var(--amber2); }
.field-ic, .feat-ic { width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center; background: rgba(34,211,238,.1); color: var(--cyan); flex-shrink: 0; border: 1px solid rgba(34,211,238,.2); }
.field-ic .mi, .feat-ic .mi { font-size: 24px; }
.field p { color: var(--muted); font-size: .94rem; margin: 12px 0 14px; }
.field-l { display: flex; flex-direction: column; gap: 6px; }
.field-l a { font-size: .88rem; text-decoration: none; color: #c7d3e4; padding-left: 14px; position: relative; }
.field-l a::before { content: ""; position: absolute; left: 0; top: .6em; width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); opacity: .6; }
.field-l a:hover { color: var(--cyan2); }
@media (max-width: 1080px) { .fields { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .fields { grid-template-columns: 1fr; } }

/* cartões de experimentos */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.card { display: flex; flex-direction: column; text-decoration: none; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; transition: transform .2s, border-color .2s, box-shadow .2s; }
.card:hover { transform: translateY(-3px); border-color: rgba(34,211,238,.45); box-shadow: 0 24px 50px -24px rgba(34,211,238,.35); }
.card-img { position: relative; aspect-ratio: 16 / 10; background: #0b1220; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .card-img img { transform: scale(1.04); }
.card-img .ph { width: 100%; height: 100%; display: grid; place-items: center; color: var(--cyan); }
.card-img .ph .mi { font-size: 56px; }
.card-tag { position: absolute; left: 10px; top: 10px; display: inline-flex; align-items: center; gap: 5px; font: 500 11px/1 var(--mono); background: rgba(7,11,20,.82); color: var(--cyan2); padding: 6px 9px; border-radius: 999px; border: 1px solid var(--line2); }
.card-tag .mi { font-size: 14px; }
.card-b { padding: 16px 18px 20px; }
.card-b h3 { font: 700 1.05rem/1.25 var(--display); letter-spacing: -.01em; }
.card-b p { color: var(--muted); font-size: .9rem; margin-top: 6px; }

/* recursos */
.feats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feat { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 26px; }
.feat h3 { font: 700 1.15rem/1.25 var(--display); margin: 16px 0 8px; }
.feat p { color: var(--muted); font-size: .95rem; }
@media (max-width: 980px) { .feats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .feats { grid-template-columns: 1fr; } }

/* validação */
.split { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: center; }
.tbl { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--card); }
.tbl table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.tbl th, .tbl td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.tbl th { font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--muted); background: rgba(255,255,255,.02); }
.tbl tr:last-child td { border-bottom: 0; }
.tbl .num { font-family: var(--mono); white-space: nowrap; }
.tbl td.num:nth-child(2) { color: var(--cyan2); } .tbl td.num:nth-child(3) { color: var(--amber2); }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 28px; } }

/* professores */
.steps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.step { display: flex; gap: 16px; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 24px; }
.step h3 { font: 700 1.1rem/1.25 var(--display); margin-bottom: 6px; }
.step p { color: var(--muted); font-size: .95rem; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }

/* FAQ */
.faq { display: grid; gap: 10px; }
.qa { background: var(--card); border: 1px solid var(--line); border-radius: 14px; }
.qa summary { list-style: none; cursor: pointer; padding: 18px 20px; font-weight: 600; display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary .mi { transition: transform .2s; color: var(--cyan); }
.qa[open] summary .mi { transform: rotate(180deg); }
.qa p { padding: 0 20px 18px; color: var(--muted); }

/* chamada final */
.final { padding: 100px 0; text-align: center; background: radial-gradient(60% 120% at 50% 100%, rgba(34,211,238,.18), transparent 70%), radial-gradient(40% 80% at 80% 0%, rgba(245,158,11,.12), transparent 70%); border-top: 1px solid var(--line); }
.final p { color: var(--muted); margin: 14px 0 30px; font-size: 1.1rem; }

/* rodapé */
.foot { border-top: 1px solid var(--line); padding: 56px 0 30px; background: #060912; }
.foot h4 { font: 600 12px var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--dim); margin: 0 0 12px; }
.foot ul { list-style: none; display: grid; gap: 8px; margin-bottom: 22px; }
.foot a { text-decoration: none; color: #b7c4d8; font-size: .92rem; }
.foot a:hover { color: var(--cyan2); }
.foot-top { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; padding-bottom: 32px; border-bottom: 1px solid var(--line); margin-bottom: 32px; }
.foot-about p { color: var(--muted); margin-top: 14px; max-width: 460px; }
.foot-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.foot-b { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
@media (max-width: 860px) { .foot-grid { grid-template-columns: repeat(2, 1fr); } .foot-top { grid-template-columns: 1fr; } }

/* páginas internas */
.page main { padding-bottom: 80px; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font: 13px var(--mono); color: var(--dim); padding: 28px 0 0; }
.crumbs a { color: var(--muted); text-decoration: none; } .crumbs a:hover { color: var(--cyan2); }
.page-h { padding: 26px 0 36px; max-width: 780px; }
.page-h .lead { margin-top: 14px; }
.grp { margin-bottom: 52px; }
.grp h2 { display: flex; align-items: center; gap: 10px; font: 700 1.5rem/1.2 var(--display); margin-bottom: 18px; }
.grp h2 .mi { color: var(--cyan); }
.grp h2 small { font: 13px var(--mono); color: var(--amber2); }
.exp-art { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; padding-top: 22px; align-items: start; }
.exp-h { grid-column: 1; }
.exp-h h1 { font: 800 clamp(2rem, 4.4vw, 3.3rem)/1.06 var(--display); letter-spacing: -.03em; margin: 18px 0 14px; }
.exp-h .note { display: inline-flex; gap: 6px; align-items: center; color: var(--muted); font-size: .88rem; }
.exp-shot { grid-column: 2; grid-row: 1 / span 2; position: sticky; top: 90px; display: block; border-radius: 22px; overflow: hidden; border: 1px solid var(--line2); background: #0b1220; box-shadow: 0 40px 80px -36px rgba(0,0,0,.9); aspect-ratio: 16 / 10; }
.exp-shot img { width: 100%; height: 100%; object-fit: cover; }
.exp-shot .play { position: absolute; inset: 0; margin: auto; width: 76px; height: 76px; border-radius: 50%; display: grid; place-items: center; background: rgba(34,211,238,.92); color: #04121a; box-shadow: 0 10px 40px rgba(34,211,238,.5); transition: transform .2s; }
.exp-shot .play .mi { font-size: 40px; }
.exp-shot:hover .play { transform: scale(1.08); }
.exp-body { grid-column: 1; }
.exp-body h2 { display: flex; align-items: center; gap: 10px; font: 700 1.3rem/1.2 var(--display); margin: 28px 0 12px; }
.exp-body h2 .mi { color: var(--cyan); }
.exp-body .theory { font-size: 1.06rem; color: #c9d5e6; }
.exp-body ul { padding-left: 22px; display: grid; gap: 8px; color: #c2cee0; }
.exp-body li::marker { color: var(--cyan); }
.others { margin-top: 28px; }
.others a { color: var(--cyan2); }
.sec-rel { margin-top: 70px; }
.sec-rel h2 { font: 700 1.5rem/1.2 var(--display); margin-bottom: 18px; }
.katex { font-size: 1.05em; }
@media (max-width: 900px) { .exp-art { grid-template-columns: 1fr; } .exp-shot { grid-column: 1; grid-row: auto; position: relative; top: 0; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
[hidden] { display: none !important; }