:root{--bg:#f6f1e7;--paper:#fffdf8;--ink:#2b2520;--muted:#6b615a;--accent:#8b2f2f;--line:#d9cfbf;--ok:#3a7d44}
@media (prefers-color-scheme:dark){:root{--bg:#1c1917;--paper:#26221f;--ink:#ede6da;--muted:#a89f93;--accent:#e08a7a;--line:#3d3631;--ok:#7fc98a}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Georgia,"Times New Roman",serif;line-height:1.65;font-size:1.08rem}
a{color:var(--accent)}

.topo{max-width:720px;margin:0 auto;padding:1.4rem 1rem .6rem;display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:.6rem}
.marca{font-size:1.5rem;text-decoration:none;color:var(--ink);letter-spacing:.02em}
.marca span{color:var(--accent)}
.topo nav a{margin-left:1.2rem;text-decoration:none;color:var(--muted);font-size:.95rem;text-transform:uppercase;letter-spacing:.08em}
.topo nav a:hover{color:var(--accent)}

main{max-width:720px;margin:0 auto 3rem;padding:0 1rem}
.enigma,.registar{padding:2.5rem 2rem;background:var(--paper);border:1px solid var(--line);border-radius:6px;box-shadow:0 2px 12px rgba(0,0,0,.06);margin-top:1rem}
@media (max-width:600px){.enigma,.registar{padding:1.6rem 1.1rem}}

h1{font-size:2rem;margin:0 0 .25rem;letter-spacing:.01em;line-height:1.2}
.sub{color:var(--muted);font-style:italic;margin:0 0 2rem}
.sub .data{font-style:normal;font-size:.9rem}
h2{font-size:1.2rem;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);margin:2.2rem 0 .8rem;border-bottom:1px solid var(--line);padding-bottom:.3rem}
.registar h2{margin-top:0}
h3{font-size:1.05rem;margin:0 0 .5rem}
p{margin:0 0 1rem}
blockquote{margin:1.2rem 0;padding:.9rem 1.2rem;background:var(--bg);border-left:4px solid var(--accent);font-family:"Courier New",monospace;font-size:.95rem;white-space:pre-line}
.suspeito{margin-bottom:1.2rem}
.suspeito b{color:var(--accent)}

.pergunta{margin-top:2.5rem;padding-top:1.5rem;border-top:2px solid var(--line)}
.opcoes{list-style:none;padding:0;display:grid;gap:.5rem;margin:1rem 0}
.opcoes li{padding:.7rem 1rem;border:1px solid var(--line);border-radius:4px}
.nota{font-size:.9rem;color:var(--muted);margin-top:1rem}
.centro{text-align:center}

.lista{list-style:none;padding:0;margin:0}
.lista li{padding:.7rem 0;border-bottom:1px solid var(--line);display:flex;gap:1rem;align-items:baseline}
.lista .data{color:var(--muted);font-size:.9rem;font-family:"Courier New",monospace;white-space:nowrap}
.lista a{text-decoration:none}
.lista a:hover{text-decoration:underline}

.registar form{display:flex;gap:.5rem;flex-wrap:wrap;margin:1rem 0 .5rem}
.registar input[type=email]{flex:1;min-width:220px;font:inherit;padding:.7rem 1rem;border:1px solid var(--line);border-radius:4px;background:var(--bg);color:var(--ink)}
.registar button{font:inherit;padding:.7rem 1.4rem;border:none;border-radius:4px;background:var(--accent);color:#fff;cursor:pointer}
.registar button:hover{filter:brightness(1.1)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}

.solucao .resposta{font-size:1.3rem;padding:1rem 1.2rem;border:2px solid var(--ok);border-radius:4px;margin:1rem 0 2rem}
.opcao{margin:0 0 1.2rem;padding:1rem 1.2rem;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:4px}
.opcao.certa{border-left-color:var(--ok)}
.opcao h3 span{font-weight:normal;color:var(--muted);font-size:.9rem;margin-left:.5rem}
.camadas li{margin-bottom:.7rem}

.rodape{max-width:720px;margin:0 auto;padding:1rem 1rem 3rem;color:var(--muted);font-size:.9rem;text-align:center}
.rodape p{margin:.3rem 0}