:root {
  --bg: #0f0f12;
  --panel: #1a1a20;
  --panel-2: #22222b;
  --border: #2a2a34;
  --text: #e8e8ec;
  --muted: #8a8a95;
  --accent: #6e9eff;
  --accent-hover: #87afff;
  --success: #5fd38c;
  --error: #ff6b6b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
}

body { padding: 2.5rem 1rem 4rem; }

main {
  max-width: 780px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--muted);
  margin: 0;
}

#drop-zone {
  border: 2px dashed var(--border);
  border-radius: 14px;
  padding: 3rem 1.5rem;
  text-align: center;
  background: var(--panel);
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
  cursor: pointer;
}

#drop-zone:hover { border-color: #3b3b48; }

#drop-zone.dragover {
  border-color: var(--accent);
  background: #1d2030;
}

.drop-title { margin: 0 0 0.5rem; font-size: 1.05rem; }
.hint { color: var(--muted); font-size: 0.875rem; margin: 0; }

.link {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link:hover { color: var(--accent-hover); }

#file-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.file-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 0.75rem;
  align-items: center;
}

.file-name {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.file-meta {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.82rem;
}

.status {
  grid-column: 1 / -1;
  font-size: 0.875rem;
  color: var(--muted);
  margin-top: 0.25rem;
  min-height: 1.25rem;
}
.status.done { color: var(--success); }
.status.error { color: var(--error); }

select, button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}

select:hover, button:hover:not(:disabled) {
  border-color: #3b3b48;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 500;
}
button.primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

button:disabled, select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.remove {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
  padding: 0.5rem;
  font-size: 1rem;
  line-height: 1;
}
button.remove:hover:not(:disabled) {
  color: var(--error);
  border-color: var(--border);
}

a.download {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
a.download:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.spinner {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-right: 0.4rem;
  vertical-align: -0.15em;
}

@keyframes spin { to { transform: rotate(360deg); } }

footer {
  margin-top: 2rem;
  text-align: center;
}

@media (max-width: 520px) {
  body { padding: 1.5rem 0.75rem 3rem; }
  h1 { font-size: 1.75rem; }
  .file-item { grid-template-columns: 1fr auto; }
}