/* Nativo · offline lessons. Paper #F2F4F6, ink #0B1013, cyan #00707F, pills. */
:root{--of-ink:#0B1013;--of-paper:#F2F4F6;--of-cyan:#00707F;--of-line:rgba(11,16,19,.12);--of-mute:#4A5559;--of-warn:#8A3B12}

.of-banner{position:fixed;left:50%;top:max(10px,env(safe-area-inset-top));transform:translate(-50%,-140%);z-index:9999;display:flex;align-items:center;gap:8px;width:max-content;max-width:calc(100vw - 24px);padding:9px 16px;border-radius:999px;background:var(--of-ink);color:#F2F4F6;font:600 13px/1.3 Inter,system-ui,sans-serif;box-shadow:0 6px 24px rgba(11,16,19,.25);transition:transform .25s ease;pointer-events:none}
.of-banner.on{transform:translate(-50%,0)}
.of-banner svg{width:16px;height:16px;flex:none}

.of-toast{position:fixed;left:50%;bottom:calc(88px + env(safe-area-inset-bottom));transform:translate(-50%,24px);opacity:0;z-index:9999;display:flex;align-items:center;gap:14px;max-width:calc(100vw - 24px);padding:10px 10px 10px 18px;border-radius:999px;background:var(--of-ink);color:#F2F4F6;font:500 14px/1.3 Inter,system-ui,sans-serif;transition:opacity .2s,transform .2s;pointer-events:none}
.of-toast.on{opacity:1;transform:translate(-50%,0);pointer-events:auto}
.of-toast button{min-height:40px;padding:0 16px;border:0;border-radius:999px;background:#F2F4F6;color:var(--of-ink);font:700 13px Inter,system-ui,sans-serif;cursor:pointer}

.of-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border:1.5px solid var(--of-ink);border-radius:999px;background:transparent;color:var(--of-ink);font:700 14px/1 Inter,system-ui,sans-serif;text-decoration:none;cursor:pointer;transition:background .15s,color .15s}
.of-btn svg{width:18px;height:18px;flex:none}
.of-btn small{font:500 12px Inter,system-ui,sans-serif;opacity:.7}
.of-btn:hover:not(:disabled){background:var(--of-ink);color:#F2F4F6}
.of-btn.solid{background:var(--of-ink);color:#F2F4F6;width:100%}
.of-btn.solid:hover:not(:disabled){background:var(--of-cyan);border-color:var(--of-cyan)}
.of-btn.ghost{border-color:transparent;color:var(--of-mute);padding:0 12px}
.of-btn:disabled{opacity:.4;cursor:default}
.of-btn:focus-visible,.of-link:focus-visible{outline:3px solid var(--of-cyan);outline-offset:2px}

.of-prog{flex:1;min-width:90px;height:8px;border-radius:99px;background:var(--of-line);overflow:hidden}
.of-prog i{display:block;height:100%;background:var(--of-cyan);border-radius:99px;transition:width .2s}
.of-pct{font:700 13px Inter,system-ui,sans-serif;color:var(--of-cyan);min-width:38px;text-align:right}
.of-ready,.of-err{display:inline-flex;align-items:center;gap:6px;font:600 13px/1.3 Inter,system-ui,sans-serif}
.of-ready{color:var(--of-cyan)}
.of-err{color:var(--of-warn)}
.of-ready svg,.of-err svg{width:18px;height:18px;flex:none}

/* aula.html strip */
.of-strip{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:6px 16px 8px;border-top:1px solid var(--of-line);font-family:Inter,system-ui,sans-serif}
.of-strip[hidden]{display:none}
.of-strip .of-lbl{font:600 12px Inter,system-ui,sans-serif;color:var(--of-mute)}
.of-strip .of-ctl{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end;flex:1}
.of-strip .of-btn{min-height:36px;padding:0 14px;font-size:13px}

.of-link{display:inline-flex;align-items:center;gap:8px;margin:10px 0 0;min-height:44px;padding:0 16px;border:1.5px solid var(--of-line);border-radius:999px;color:var(--of-ink);font:600 13px Inter,system-ui,sans-serif;text-decoration:none;background:#fff}
.of-link svg{width:18px;height:18px;color:var(--of-cyan)}

/* offline.html */
body.of-page{margin:0;background:var(--of-paper);color:var(--of-ink);font:400 16px/1.5 Inter,system-ui,sans-serif;-webkit-text-size-adjust:100%}
.of-wrap{max-width:640px;margin:0 auto;padding:max(20px,env(safe-area-inset-top)) 16px 96px}
.of-back{display:inline-flex;align-items:center;min-height:44px;color:var(--of-mute);font:600 14px Inter,system-ui,sans-serif;text-decoration:none}
.of-wrap h1{margin:8px 0 8px;font:400 clamp(32px,9vw,44px)/1.05 Fraunces,Georgia,serif;letter-spacing:-.02em}
.of-lead{margin:0 0 24px;color:var(--of-mute);max-width:46ch}
.of-card{margin:0 0 14px;padding:20px;border-radius:24px;background:#fff;border:1px solid var(--of-line)}
.of-card.plain{background:transparent;border-style:dashed}
.of-card h2{margin:0 0 6px;font:400 22px/1.15 Fraunces,Georgia,serif}
.of-kick{margin:0 0 2px;font:700 11px Inter,system-ui,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--of-cyan)}
.of-sub{margin:4px 0 14px;color:var(--of-mute);font-size:14px}
.of-note{padding:20px;border-radius:24px;background:#fff;border:1px solid var(--of-line)}
.of-big{display:flex;align-items:baseline;gap:10px;margin:2px 0 12px}
.of-big b{font:400 40px/1 Fraunces,Georgia,serif}
.of-big span{color:var(--of-mute);font-size:14px}
.of-meter{height:8px;border-radius:99px;background:var(--of-line);overflow:hidden}
.of-meter i{display:block;height:100%;background:var(--of-ink)}
.of-store .of-sub{margin-top:10px;margin-bottom:0}
.of-mh{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.of-list{list-style:none;margin:8px 0 0;padding:0}
.of-list li{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--of-line)}
.of-t{min-width:0}
.of-t b{display:block;font:600 15px/1.3 Inter,system-ui,sans-serif}
.of-t span{color:var(--of-mute);font-size:13px}
.of-list .of-ctl{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end;flex:0 1 auto}
.of-facts{margin:8px 0 0;padding-left:18px;color:var(--of-mute);font-size:14px}
.of-facts li{margin:6px 0}
.of-facts b{color:var(--of-ink)}

@media (prefers-reduced-motion:reduce){.of-banner,.of-toast,.of-prog i,.of-btn{transition:none}}