:root {
  --bg: #1e1f22;
  --panel: #26282c;
  --line: #3a3d42;
  --text: #d6d8db;
  --muted: #8b9096;
  --accent: #5b8def;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Apple SD Gothic Neo", sans-serif;
}
.shell {
  width: min(680px, 92vw);
  padding: 32px 0;
}
h1 {
  margin: 0;
  text-align: center;
  font-size: 26px;
  color: var(--text);
}
.tagline {
  margin: 6px 0 22px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 42px 20px;
  border: 2px dashed var(--line);
  border-radius: 8px;
  background: var(--panel);
  cursor: pointer;
  transition:
    border-color 0.15s,
    color 0.15s;
}
.drop.hover {
  border-color: var(--accent);
  color: var(--text);
}
.drop small {
  color: var(--muted);
  font-size: 12px;
}
.options {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin: 18px 0;
  align-items: center;
}
.options label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}
select,
input[type="number"] {
  background: #2b2d31;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 7px 10px;
  color: var(--text);
}
.start {
  width: 100%;
  padding: 13px;
  border: 0;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  background: #3d5a99;
}
.start:hover {
  background: #4768ac;
}
.start:disabled {
  background: #2b2d31;
  color: #565a61;
  cursor: not-allowed;
}
.bar {
  margin-top: 18px;
  height: 20px;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: #26282c;
  overflow: hidden;
}
.fill {
  height: 100%;
  width: 0;
  background: #3d5a99;
  transition: width 0.2s;
}
.status {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}
.download {
  display: block;
  margin-top: 14px;
  padding: 12px;
  text-align: center;
  text-decoration: none;
  font-weight: 600;
  color: #fff;
  border-radius: 6px;
  background: #3f6b4f;
}
.download:hover {
  background: #4a7d5c;
}
.preview {
  margin-top: 18px;
}
.preview video {
  display: block;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #000;
}
.preview-msg {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}
footer {
  margin-top: 24px;
  text-align: center;
  font-size: 11px;
  color: #565a61;
}