:root{
  --bg:#f4f6f9; --card:#fff; --ink:#1b2430; --muted:#6b7686; --line:#e3e8ef;
  --brand:#1f4e79; --brand-2:#2c6aa0; --accent:#e0a526;
  --ok:#1e7a46; --ok-bg:#e6f4ec; --err:#b3261e; --err-bg:#fbe9e7;
  --radius:12px;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#10161d; --card:#18212b; --ink:#e8edf3; --muted:#93a0b0; --line:#273341;
    --brand:#5aa2e0; --brand-2:#7bb6ea; --ok:#5fd08e; --ok-bg:#12301f; --err:#ff8a80; --err-bg:#3a1714; }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.25;margin:0 0 .4rem}
h1{font-size:1.6rem} h2{font-size:1.15rem}
.muted{color:var(--muted)} .small{font-size:.85rem} .pad{padding:.5rem 0}
.wrap{max-width:980px;margin:0 auto;padding:0 16px}

/* topo */
.topbar{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px}
.brand{font-weight:700;display:flex;align-items:center;gap:10px}
.dot{width:12px;height:12px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 25%,transparent)}
.back{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:70%}

.hero{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:28px 0 14px;flex-wrap:wrap}

/* botões */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);background:var(--card);color:var(--ink);
  padding:.55rem .95rem;border-radius:9px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;line-height:1.2}
.btn:hover{border-color:var(--brand);text-decoration:none}
.btn.sm{padding:.35rem .65rem;font-size:.85rem}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-2)}
.btn.ghost{background:transparent}
.btn.danger{color:var(--err)} .btn.danger:hover{border-color:var(--err);background:var(--err-bg)}
.btn.block{width:100%}
.btn[disabled]{opacity:.45;cursor:not-allowed}

/* cartões */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin:0 0 14px}
.form-card{padding:18px}
.form-card.inner{margin:14px 0 0;border:1px dashed var(--line);border-radius:10px}
.empty{padding:28px;text-align:center}
label{display:block;font-weight:600;font-size:.9rem;margin:.8rem 0 .3rem}
input[type=text],input[type=password],input:not([type]),input[name]{width:100%}
input[name=title],input[name=description],input[name=name],input[type=password]{
  padding:.65rem .8rem;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--ink);font:inherit}
input:focus{outline:2px solid color-mix(in srgb,var(--brand) 55%,transparent);border-color:var(--brand)}
.row{display:flex;gap:10px;align-items:center;margin-top:14px;flex-wrap:wrap}

/* alertas */
.alert{padding:.7rem .95rem;border-radius:9px;margin:0 0 10px;font-weight:500}
.alert.ok{background:var(--ok-bg);color:var(--ok)}
.alert.err{background:var(--err-bg);color:var(--err)}

/* módulo */
.module summary{list-style:none;display:flex;align-items:center;gap:14px;padding:16px 18px;cursor:pointer}
.module summary::-webkit-details-marker{display:none}
.num{flex:none;width:36px;height:36px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700}
.mt{flex:1;min-width:0;display:flex;flex-direction:column}
.mt strong{font-size:1.05rem}
.mt small{color:var(--muted)}
.count{color:var(--muted);font-size:.85rem;white-space:nowrap}
.chev{width:10px;height:10px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .15s;flex:none;margin-left:4px}
.module[open] .chev{transform:rotate(-135deg)}
.module-body{padding:0 18px 18px;border-top:1px solid var(--line)}

/* arquivos */
.files{list-style:none;margin:0;padding:0}
.files li{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}
.fn{flex:1;min-width:0;display:flex;flex-direction:column}
.fname{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink)}
.acts{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.acts form{margin:0}
.badge{flex:none;min-width:46px;text-align:center;font-size:.7rem;font-weight:800;letter-spacing:.03em;padding:.35rem .4rem;border-radius:7px;background:#64748b;color:#fff}
.b-pdf{background:#d93025}
.b-doc,.b-docx,.b-odt{background:#2a5db0}
.b-ppt,.b-pptx,.b-odp{background:#d9622b}
.b-xls,.b-xlsx,.b-ods,.b-csv{background:#1e8e50}
.b-mp4,.b-webm,.b-mov{background:#7a3db8}
.b-mp3,.b-m4a,.b-wav,.b-ogg{background:#b8379a}
.b-jpg,.b-jpeg,.b-png,.b-gif,.b-webp{background:#0e8f9b}
.b-zip,.b-rar,.b-7z{background:#8a6d1d}

/* upload */
.upload{margin-top:16px;display:flex;flex-direction:column;gap:10px}
.drop{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center;font-weight:400;
  border:2px dashed var(--line);border-radius:10px;padding:22px 14px;cursor:pointer;margin:0;background:var(--bg)}
.drop:hover,.drop.over{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 8%,var(--bg))}
.drop input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.picked{font-weight:600;color:var(--brand)}
.progress{position:relative;height:22px;border-radius:99px;background:var(--line);overflow:hidden}
.progress div{height:100%;width:0;background:var(--brand);transition:width .1s}
.progress span{position:absolute;inset:0;display:grid;place-items:center;font-size:.75rem;font-weight:700;color:#fff;mix-blend-mode:difference}
.upload .btn{align-self:flex-start}

.mod-tools{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);align-items:center}
.mod-tools form{margin:0;display:flex;gap:8px}

/* visualizador */
.viewer{padding-top:22px;padding-bottom:40px}
.vt{word-break:break-word}
.stage{margin-top:14px}
.stage iframe{width:100%;height:78vh;min-height:480px;border:1px solid var(--line);border-radius:10px;background:#fff}
.stage img{max-width:100%;height:auto;border-radius:10px;border:1px solid var(--line);display:block;margin:auto}
.stage video{width:100%;max-height:78vh;background:#000;border-radius:10px}
.stage audio{width:100%}
.txt{white-space:pre-wrap;word-wrap:break-word;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;font:14px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.dl-card{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:36px 20px}
.pager{display:flex;justify-content:space-between;gap:10px;margin-top:20px;flex-wrap:wrap}

/* login */
.login{min-height:100vh;display:grid;place-items:center;padding:20px}
.login-card{width:100%;max-width:380px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px 26px;box-shadow:0 10px 30px rgba(0,0,0,.06)}
.login-icon{width:54px;height:54px;border-radius:14px;background:var(--brand);color:#fff;display:grid;place-items:center;margin-bottom:14px}
.login-card .btn{margin-top:16px}

dialog{border:1px solid var(--line);border-radius:14px;padding:20px;width:min(420px,92vw);background:var(--card);color:var(--ink)}
dialog::backdrop{background:rgba(0,0,0,.45)}

@media (max-width:640px){
  .files li{flex-wrap:wrap}
  .acts{width:100%;justify-content:flex-start}
  .count{display:none}
  .hero{padding-top:20px}
}