:root{--bg: #0f172a;--panel: #1e293b;--accent: #38bdf8;--accent-strong: #0ea5e9;--text: #e2e8f0;--muted: #94a3b8;--ok: #4ade80;--err: #f87171}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;flex-direction:column;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}main{flex:1;width:100%;max-width:640px;margin:0 auto;padding:3rem 1.5rem;text-align:center}h1{font-size:2.5rem;margin:0 0 .5rem;letter-spacing:-.02em}.tagline{color:var(--muted);font-size:1.05rem;margin-bottom:2rem}.tagline strong{color:var(--accent)}.drop-zone{border:2px dashed #334155;border-radius:14px;background:var(--panel);padding:3rem 1.5rem;transition:border-color .15s,background .15s}.drop-zone.dragover{border-color:var(--accent);background:#233149}.drop-zone p{margin:0;color:var(--muted)}button,.download-link{cursor:pointer;font:inherit;border:none;border-radius:8px;padding:.5rem 1rem;background:var(--accent-strong);color:#04293a;font-weight:600}button:hover,.download-link:hover{background:var(--accent)}.controls{margin:1.5rem 0;display:flex;gap:.6rem;align-items:center;justify-content:center}select{font:inherit;padding:.4rem .6rem;border-radius:8px;border:1px solid #334155;background:var(--panel);color:var(--text)}.status{min-height:1.5em;color:var(--muted);margin:1.5rem 0}.status.working{color:var(--accent)}.status.ok{color:var(--ok)}.status.error{color:var(--err)}.progress{height:8px;max-width:320px;margin:-.75rem auto 1.5rem;background:#1e293b;border:1px solid #334155;border-radius:999px;overflow:hidden}.progress-bar{height:100%;width:0;background:var(--accent);transition:width .15s ease}.download-link{display:inline-block;text-decoration:none;margin-top:.5rem;padding:.7rem 1.4rem}.result{margin-top:1.5rem;padding:1.5rem;border:1px solid #334155;border-radius:14px;background:var(--panel)}.name-row{display:flex;align-items:center;justify-content:center;gap:.5rem;flex-wrap:wrap;margin-bottom:1.25rem}.name-row label{color:var(--muted)}#out-name{font:inherit;padding:.45rem .7rem;border-radius:8px;border:1px solid #334155;background:#0f172a;color:var(--text);min-width:12rem;text-align:right}.name-row .ext{color:var(--muted);margin-left:-.4rem}.validation{margin-top:1.75rem;text-align:left;border-top:1px solid #334155;padding-top:1rem}.validation h2{font-size:1rem;margin:0 0 .75rem;color:var(--text)}.validation ul{list-style:none;margin:0;padding:0}.validation li{display:flex;align-items:center;gap:.6rem;padding:.25rem 0;color:var(--muted)}.validation li .mark{flex:none;width:1.3rem;height:1.3rem;display:grid;place-items:center;border-radius:50%;font-size:.8rem;font-weight:700}.validation li.pass .mark{background:#4ade8026;color:var(--ok)}.validation li.fail .mark{background:#f8717126;color:var(--err)}.validation-note{font-size:.8rem;color:var(--muted);margin:1rem 0 0;line-height:1.5}.validation-note a{color:var(--accent)}footer{text-align:center;padding:1.5rem;color:var(--muted);font-size:.85rem;border-top:1px solid #1e293b}