:root {
  --bg: #f5f6fa; --card: #fff; --txt: #1c2033; --mut: #667; --bord: #dde0ea;
  --pri: #3b5bdb; --pri-t: #fff; --ok: #2b9348; --bad: #d62839; --warn: #f4a300;
  --c0: #e21b3c; --c1: #1368ce; --c2: #d89e00; --c3: #26890c; --c4: #864cbf; --c5: #0aa3a3;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14161f; --card: #1e2130; --txt: #eceef7; --mut: #9aa0b8; --bord: #32364d; --pri: #6c8cff; --pri-t: #0b0d16; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--txt); font: 16px/1.45 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 20px 16px 48px; }
main.largo { max-width: 1100px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; } h2 { font-size: 1.15rem; margin: 24px 0 8px; }
.mut { color: var(--mut); } .centro { text-align: center; }
.card { background: var(--card); border: 1px solid var(--bord); border-radius: 12px; padding: 16px; margin: 12px 0; }
label { display: block; font-weight: 600; margin: 12px 0 4px; }
input, textarea { width: 100%; padding: 12px; font: inherit; color: var(--txt); background: var(--bg); border: 1px solid var(--bord); border-radius: 8px; }
textarea { min-height: 260px; font-family: ui-monospace, Consolas, monospace; font-size: .9rem; }
button, .btn { display: inline-block; padding: 12px 18px; font: inherit; font-weight: 600; color: var(--pri-t); background: var(--pri); border: 0; border-radius: 8px; cursor: pointer; text-decoration: none; }
button.sec, .btn.sec { background: transparent; color: var(--pri); border: 1px solid var(--pri); }
button.bad { background: var(--bad); color: #fff; }
button:disabled { opacity: .5; cursor: default; }
button.grande, .btn.grande { display: block; width: 100%; padding: 16px; font-size: 1.1rem; margin-top: 16px; }
.linha { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.msg { padding: 12px; border-radius: 8px; margin: 12px 0; }
.msg.erro { background: color-mix(in srgb, var(--bad) 15%, transparent); color: var(--bad); }
.msg.ok { background: color-mix(in srgb, var(--ok) 15%, transparent); color: var(--ok); }
.oculto { display: none !important; }
.matricula { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; font-family: ui-monospace, Consolas, monospace; font-size: 1.1rem; font-weight: 700; }
.matricula input { width: 4.6em; text-align: center; font: inherit; font-weight: 600; }
.matricula input:last-child { width: 5.4em; }
table { width: 100%; border-collapse: collapse; } td, th { padding: 6px 8px; border-bottom: 1px solid var(--bord); text-align: left; }
a { color: var(--pri); }
/* projetor */
.qrbox { background: #fff; padding: 16px; border-radius: 16px; display: inline-block; line-height: 0; }
.qrbox svg { width: min(70vh, 80vw, 520px); height: auto; }
.grade { display: grid; grid-template-columns: minmax(280px, 560px) 1fr; gap: 24px; align-items: start; }
@media (max-width: 800px) { .grade { grid-template-columns: 1fr; } }
.barra { height: 8px; background: var(--bord); border-radius: 4px; overflow: hidden; margin: 8px 0; }
.barra > i { display: block; height: 100%; background: var(--pri); }
.contador { font-size: 3rem; font-weight: 800; }
.pin { font-size: 3.2rem; font-weight: 800; letter-spacing: .15em; }
/* quiz */
.opcoes { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
@media (max-width: 520px) { .opcoes { grid-template-columns: 1fr; } }
.op { display: flex; align-items: center; gap: 10px; padding: 18px 14px; border: 0; border-radius: 10px; color: #fff; font-size: 1.05rem; text-align: left; position: relative; }
.op b { font-size: 1.4rem; }
.op.c0 { background: var(--c0); } .op.c1 { background: var(--c1); } .op.c2 { background: var(--c2); }
.op.c3 { background: var(--c3); } .op.c4 { background: var(--c4); } .op.c5 { background: var(--c5); }
.op.apagada { opacity: .35; }
.op.certa { outline: 5px solid var(--ok); }
.op .n { margin-left: auto; font-weight: 800; font-size: 1.3rem; }
.ranking { list-style: none; margin: 0; padding: 0; counter-reset: r; }
.ranking li { counter-increment: r; display: flex; gap: 10px; padding: 10px 12px; margin: 6px 0; background: var(--card); border: 1px solid var(--bord); border-radius: 8px; }
.ranking li::before { content: counter(r); font-weight: 800; min-width: 1.5em; color: var(--mut); }
.ranking li span:last-child { margin-left: auto; font-weight: 700; }
.pergunta { font-size: 1.4rem; font-weight: 700; margin: 8px 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }