:root {
  color-scheme: dark;
  color: #f4f4f4;
  background: #121212;
  font-family: Inter, system-ui, sans-serif;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: radial-gradient(circle at top, rgba(90, 90, 120, 0.15), transparent 35%),
    linear-gradient(180deg, #121212, #090909 70%);
}

.app-shell {
  width: min(960px, 100%);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  background: rgba(18, 18, 18, 0.96);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.25);
}

h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(2rem, 3vw, 3rem);
  letter-spacing: -0.05em;
}

.subtitle {
  margin: 0 0 1.75rem;
  color: #c8c8d2;
}

.drop-zone {
  position: relative;
  border: 2px dashed rgba(255, 255, 255, 0.16);
  border-radius: 20px;
  min-height: 220px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1.5rem;
  transition: border-color 0.2s ease, background 0.2s ease;
  background: rgba(255, 255, 255, 0.02);
}

.drop-zone.dragover {
  border-color: #8b8cff;
  background: rgba(139, 140, 255, 0.08);
}

.drop-content {
  pointer-events: none;
}

.drop-zone .icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.drop-zone strong,
.drop-zone span {
  display: block;
}

.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.controls-row {
  margin: 1.5rem 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.controls-row label {
  color: #c8c8d2;
}

.controls-row select {
  min-width: 180px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  color: #f4f4f4;
}

.primary-btn,
.secondary-btn {
  border: none;
  border-radius: 999px;
  padding: 0.95rem 1.6rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.2s ease;
}

.primary-btn {
  background: linear-gradient(135deg, #7d5cff, #2bceff);
  color: #090909;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.05);
  color: #f4f4f4;
}

.primary-btn:disabled,
.secondary-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.primary-btn:hover:not(:disabled),
.secondary-btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.file-list {
  margin-top: 1.5rem;
  display: grid;
  gap: 1rem;
}

.file-card {
  padding: 1rem 1.25rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: grid;
  gap: 0.5rem;
}

.file-card strong {
  display: block;
  font-size: 1rem;
}

.file-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: #c8c8d2;
  font-size: 0.95rem;
}

.file-card a {
  color: #7d5cff;
  text-decoration: none;
}

.file-card a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .app-shell {
    padding: 1.25rem;
  }
}