body{font-family:Inter,system-ui,Arial,sans-serif;background:linear-gradient(135deg,#fdfbfb 0%,#ebedee 100%);display:flex;align-items:center;justify-content:center;height:100vh;margin:0}
.container{width:420px;background:#fff;padding:28px;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,0.08);text-align:center}
input[type=file]{width:100%;padding:8px;margin-top:10px}
button{margin-top:12px;padding:10px 18px;border-radius:8px;border:none;background:#ff6b6b;color:#fff;cursor:pointer;font-weight:600}
#preview img{width:100%;border-radius:8px;margin-top:12px}
.hidden{display:none}
#tracks{margin-top:12px;text-align:left}
.track{padding:8px;border-radius:8px;border:1px solid #eee;margin-bottom:8px}
.track a{color:#ff6b6b;text-decoration:none}