:root {
  --bg: #06070b;
  --glass: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.15);
  --neon1: #00f5ff;
  --neon2: #9b00ff;
}

* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, Segoe UI, Roboto;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, #111, var(--bg));
  color: white;
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.app {
  width: min(960px, 100%);
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  margin: 0;
  font-size: 2.6rem;
  background: linear-gradient(135deg, var(--neon1), var(--neon2));
  -webkit-background-clip: text;
  color: transparent;
}

.tag {
  opacity: 0.7;
  font-size: 0.9rem;
}

.panel {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 20px;
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  border-radius: 20px;
  padding: 20px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 18px;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: 0.3s;
}

.dropzone:hover {
  border-color: var(--neon1);
  box-shadow: 0 0 25px rgba(0,245,255,0.25);
}

.drop-inner {
  text-align: center;
}

.title {
  font-size: 1.4rem;
}

.subtitle {
  opacity: 0.7;
}

.file {
  margin-top: 10px;
  font-size: 0.9rem;
  opacity: 0.85;
}

.controls {
  display: grid;
  gap: 14px;
}

.control {
  display: flex;
  align-items: center;
  gap: 10px;
}

label {
  flex: 1;
  opacity: 0.8;
}

input[type="range"] {
  flex: 2;
}

button {
  padding: 14px;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  background: linear-gradient(135deg, var(--neon1), var(--neon2));
  color: black;
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.progress {
  height: 10px;
  background: rgba(255,255,255,0.15);
  border-radius: 999px;
  overflow: hidden;
}

.bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--neon1), var(--neon2));
}

.status {
  font-size: 0.9rem;
  opacity: 0.8;
}

.download {
  text-align: center;
  padding: 12px;
  border-radius: 12px;
  background: rgba(0,0,0,0.5);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--neon1);
}

footer {
  text-align: center;
  opacity: 0.5;
  margin-top: 14px;
  font-size: 0.8rem;
}

@media (max-width: 800px) {
  .panel {
    grid-template-columns: 1fr;
  }
}