* { box-sizing: border-box; }

:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --border: #e2e5ec;
  --text: #1a1d24;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4fd1;
  --success: #16a34a;
  --error: #dc2626;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.04);
}

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

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 {
  margin: 0 0 .25rem;
  font-size: 2rem;
}

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

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

.file-drop {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 2.5rem 1rem;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  color: var(--muted);
}
.file-drop:hover, .file-drop.dragover {
  border-color: var(--accent);
  background: rgba(37, 99, 235, 0.06);
  color: var(--text);
}
.file-drop input { display: none; }

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

label { display: inline-flex; align-items: center; gap: .5rem; }

select, input[type=range] {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .35rem .5rem;
}

button {
  background: var(--accent);
  color: white;
  border: none;
  padding: .55rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: background .15s;
}
button:hover:not(:disabled) { background: var(--accent-hover); }
button:disabled { opacity: .45; cursor: not-allowed; }

#file-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: .5rem;
}

#file-list li {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .75rem 1rem;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: .25rem 1rem;
  box-shadow: var(--shadow);
}

.fname { grid-column: 1 / 2; }
.meta {
  grid-column: 1 / 4;
  font-size: .8rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: .25rem .75rem;
}
.meta .arrow { opacity: .5; }
.meta .after { color: var(--text); }

.fname { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.status { font-size: .85rem; color: var(--muted); }
.status.done { color: var(--success); }
.status.error { color: var(--error); }

.dl-link {
  color: var(--accent);
  text-decoration: none;
  font-size: .9rem;
}
.dl-link:hover { text-decoration: underline; }

footer {
  margin-top: 2rem;
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
}
footer p { margin: 0; }

.info {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--border);
  color: var(--muted);
  font-style: italic;
  font-family: Georgia, serif;
  font-weight: 700;
  font-size: 12px;
  cursor: help;
  position: relative;
  user-select: none;
}
.info:hover, .info:focus {
  background: var(--accent);
  color: white;
  outline: none;
}
.info .tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: 260px;
  background: #1a1d24;
  color: #f7f8fb;
  padding: .65rem .8rem;
  border-radius: 6px;
  font-size: .8rem;
  font-style: normal;
  font-weight: 400;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  line-height: 1.4;
  text-align: left;
  box-shadow: 0 6px 24px rgba(0,0,0,.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity .12s;
  z-index: 10;
}
.info .tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #1a1d24;
}
.info:hover .tooltip, .info:focus .tooltip {
  opacity: 1;
}