:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #2a3139;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent-dim: #1f3a5f;
  --green: #3fb950;
  --red: #f85149;
  --yellow: #d29922;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

header { margin-bottom: 2.5rem; }

h1 {
  margin: 0;
  font-size: 1.9rem;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.step {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem 1.5rem;
  margin-bottom: 1.25rem;
  opacity: 1;
  transition: opacity 0.25s ease, border-color 0.25s ease;
}

.step[hidden] { display: none; }

.step h2 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.8rem;
  flex-shrink: 0;
}

input[type="password"],
input[type="text"] {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.55rem 0.75rem;
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

input:focus-visible, button:focus-visible, .dropzone:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.token-row { display: flex; gap: 0.6rem; }

button, .button-link {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

button:hover:not(:disabled), .button-link:hover { background: #264a77; color: #cfe5ff; }

button:disabled { opacity: 0.45; cursor: not-allowed; }

#upload-btn { margin-top: 0.75rem; }

.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.dropzone.dragover, .dropzone:hover {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.06);
}

.dropzone p { margin: 0 0 0.5rem; }

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

.file-info { margin: 0.75rem 0 0; font-size: 0.9rem; }

.error-text, .warning-text { font-size: 0.9rem; margin: 0.5rem 0 0; }
.error-text { color: var(--red); }
.warning-text { color: var(--yellow); }

.progress {
  height: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.2s ease;
}

.stat { color: var(--muted); font-size: 0.9rem; margin: 0.6rem 0 0; }

.stat code { color: var(--text); font-size: 0.85rem; }

.notice {
  background: rgba(210, 153, 34, 0.1);
  border: 1px solid rgba(210, 153, 34, 0.35);
  border-radius: 6px;
  color: var(--yellow);
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  margin: 0 0 1rem;
}

.stages {
  list-style: none;
  margin: 0;
  padding: 0;
}

.stages li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.3rem 0;
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 0.25s ease;
}

.stages li::before {
  content: "";
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  flex-shrink: 0;
  transition: background 0.25s ease, border-color 0.25s ease;
}

.stages li.done { color: var(--text); }
.stages li.done::before { background: var(--green); border-color: var(--green); }

.stages li.current { color: var(--accent); font-weight: 600; }
.stages li.current::before {
  background: var(--accent);
  border-color: var(--accent);
  animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.error-box {
  border: 1px solid var(--red);
  border-radius: 8px;
  background: rgba(248, 81, 73, 0.08);
  color: var(--red);
  padding: 0.9rem 1.1rem;
  margin-top: 1rem;
}

.error-box p { margin: 0.35rem 0 0.75rem; color: var(--text); font-size: 0.9rem; }

#result-video {
  width: 100%;
  border-radius: 8px;
  background: #000;
  border: 1px solid var(--border);
}

.result-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}