:root { --bg:#0b1220; --card:#121a2b; --txt:#e8eefc; --acc:#4ea3ff;
  --ghost:#1a2336; --border:#1f2b45; --muted:#8fa3c4; }
:root.light { --bg:#f6f8fc; --card:#ffffff; --txt:#0b1220; --acc:#2563eb;
  --ghost:#eef2ff; --border:#e5e7eb; --muted:#334155; }
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:system-ui,Arial;background:var(--bg);color:var(--txt)}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;opacity:.9}
.logo{width:28px;height:28px;object-fit:contain;border-radius:6px}
.ghost-btn{padding:8px 12px;background:var(--ghost);color:var(--txt);border:1px solid var(--border);border-radius:10px;cursor:pointer}
.container{max-width:720px;margin:24px auto 40px;background:var(--card);padding:24px;border-radius:14px;border:1px solid var(--border);box-shadow:0 10px 30px rgba(0,0,0,.15)}
h2{margin:0 0 10px 0}
label{display:block;margin:12px 0 6px;color:var(--muted)}
input[type=file]{width:100%;padding:10px;background:var(--ghost);color:var(--txt);border:1px solid var(--border);border-radius:8px}
button{margin-top:14px;padding:12px 16px;border:0;background:var(--acc);color:#061022;font-weight:700;border-radius:10px;cursor:pointer}
button:disabled{opacity:.7;cursor:not-allowed}
#result,#progress{margin-top:12px;font-size:14px;opacity:.95}
.controls,select#sortBy{display:none !important}
@media (max-width:480px){.container{margin:12px 8px 24px;padding:16px}}