:root {
  --teal: #0e8a7d;
  --teal-dark: #0b6e64;
  --ink: #1c2330;
  --ink-2: #5b6472;
  --hairline: #dbe1e9;
  --raised: #f4f6f9;
  --page: #eef1f5;
  --danger: #b3362b;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--page);
  color: var(--ink);
  line-height: 1.45;
}

header, main, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}
header { padding-top: 40px; }
header h1 { font-size: 26px; margin: 0 0 4px; }
.tagline { color: var(--teal); font-weight: 600; margin: 0 0 10px; }
.intro { color: var(--ink-2); margin: 0 0 24px; }
footer { padding: 24px 16px 40px; }
footer p { color: var(--ink-2); font-size: 12.5px; margin: 0; }

main { display: grid; gap: 14px; }

.card {
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 16px;
}

.btn {
  font: inherit;
  font-size: 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
}
.btn:disabled { opacity: 0.6; cursor: default; }
.btn-primary { background: var(--teal); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--teal-dark); }
.btn-ghost { background: #fff; border-color: var(--hairline); color: var(--ink); }
.btn-ghost:hover:not(:disabled) { background: var(--raised); }
.btn-sm { padding: 6px 12px; font-size: 13px; }

.drop {
  display: grid;
  justify-items: center;
  gap: 6px;
  text-align: center;
  padding: 36px 16px;
  border: 1.5px dashed var(--hairline);
  border-radius: 12px;
  cursor: pointer;
  background: #fff;
  transition: border-color 120ms ease, background 120ms ease;
}
.drop:hover, .drop.over { border-color: var(--teal); background: rgba(14, 138, 125, 0.06); }
.drop-icon { font-size: 34px; }
.drop-title { font-weight: 600; font-size: 16px; }
.drop-sub { color: var(--ink-2); }
.drop-note { color: var(--ink-2); font-size: 12.5px; margin-top: 6px; }

.file-name { font-weight: 600; overflow-wrap: anywhere; }
.muted { color: var(--ink-2); font-size: 13px; }
.error { color: var(--danger); font-size: 13.5px; }

.tracks { display: grid; gap: 2px; margin: 12px 0; }
.track {
  display: flex; align-items: center; gap: 12px;
  padding: 10px; border-radius: 8px; cursor: pointer;
}
.track:hover { background: var(--raised); }
.track-off { opacity: 0.55; cursor: not-allowed; }
.track input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--teal); flex: none; }
.track-info { display: grid; gap: 2px; min-width: 0; }
.track-name { font-weight: 600; }
.track-codec { color: var(--ink-2); font-size: 12.5px; }

.progress { height: 8px; border-radius: 4px; background: var(--raised); overflow: hidden; margin-top: 10px; }
.progress-bar { height: 100%; background: var(--teal); transition: width 150ms ease; }

.result-head { display: grid; gap: 2px; margin-bottom: 10px; }
.cue {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  color: var(--ink-2);
  background: var(--raised);
  border-radius: 6px;
  padding: 8px 10px;
  margin: 8px 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.translate-row { display: flex; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.translate-row label { font-size: 13px; color: var(--ink-2); }
.translate-row select {
  font-size: 13px; padding: 6px 8px;
  border: 1px solid var(--hairline); border-radius: 6px; background: #fff; color: var(--ink);
}

.modal { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.45); z-index: 50; }
.modal.open { display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal-box {
  background: #fff; border-radius: 12px;
  width: 100%; max-width: 640px; max-height: 85vh;
  display: flex; flex-direction: column; gap: 10px; padding: 14px;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-weight: 600; overflow-wrap: anywhere; }
#modal-text {
  flex: 1; min-height: 240px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  border: 1px solid var(--hairline); border-radius: 8px; padding: 10px;
  resize: vertical;
}
.modal-actions { display: flex; justify-content: flex-end; }

@media (max-width: 480px) {
  header { padding-top: 24px; }
  header h1 { font-size: 22px; }
  .btn { padding: 10px 14px; }
  .drop { padding: 28px 12px; }
}