body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: #ffffff;
  min-height: 100vh; color: #000000; line-height: 1.6;
}
.container { max-width: 800px; margin: 0 auto; padding: 10px; }

.header { text-align: center; padding: 10px;}
.header h1 { font-size: 2.2rem; color: #000000;}
.header h1 a { color: inherit; text-decoration: none; }

.section {
  background: #f5f5f5; border-radius: 16px; padding: 28px;
  margin-bottom: 28px; border: 1px solid #e0e0e0;
}
.section h2 { font-size: 1.35rem; margin-bottom: 20px; color: #000000; display: flex; align-items: center; gap: 10px; }

.btn {
  padding: 11px 22px; border: none; border-radius: 8px; font-size: 0.95rem;
  cursor: pointer; transition: background-color 0.25s ease; display: inline-flex; align-items: center; gap: 8px;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: #1976d2; color: #ffffff; font-weight: 700; }
.btn-primary:hover:not(:disabled) { background: #1565c0; }
.btn-secondary { background: #e0e0e0; color: #000000; border: 1px solid #bdbdbd; }
.btn-secondary:hover:not(:disabled) { background: #d5d5d5; }
.btn-full { width: 100%; justify-content: center; }
.btn-sm { padding: 7px 14px; font-size: 0.85rem; }

.progress-bar {
  width: 100%; height: 8px; background: #e0e0e0; border-radius: 4px;
  margin: 16px 0; overflow: hidden;
}
.progress-fill {
  height: 100%; background: #1976d2;
  border-radius: 4px; transition: width 0.3s ease;
}

.stats-row {
  display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; margin: 16px 0;
}
.stat-item { text-align: center; }
.stat-val { font-size: 1.5rem; font-weight: 700; color: #000000; }
.stat-label { font-size: 0.8rem; color: #444444; }

/* ── File info horizontal layout ── */
.file-info {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px;
  background: rgba(0,0,0,0.2);
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  flex-wrap: wrap;
}
.file-info .name {
  font-weight: 600;
}
.file-info .meta {
  font-size: 0.9rem;
}

.file-info .hash-row {
  display: flex;
  font-size: 0.85rem;
  font-style: italic;
}

.hash-row {
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
  color: #444444;
  font-size: 0.85rem;
  flex-wrap: wrap;
}
.hash-row code {
  color: #000000;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}


/* ── Controls ── */
.controls {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 20px;
}

.slider-group { margin: 16px 0; }
.slider-label {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 6px; font-size: 0.85rem; color: #444444;
}
.slider-label .val { color: #000000; font-weight: 700; }
input[type="range"] {
  width: 100%; height: 5px; border-radius: 3px;
  background: #e0e0e0; outline: none;
  -webkit-appearance: none; appearance: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: #1976d2; cursor: pointer;
}

/* ── Mobile ── */
@media (max-width: 680px) {
  .container { padding: 10px; }
  .header { padding: 10px; }
  .header h1 { font-size: 1.6rem; }
  .section { padding: 16px; }
  .stats-row { gap: 16px; }
  .stat-val { font-size: 1.2rem; }
}

.hidden {
    display: none !important;
}