:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2f3d;
  --text: #e8eaf0;
  --muted: #9aa3b5;
  --accent: #5b8cff;
  --accent-hover: #7aa1ff;
  --success: #3ecf8e;
  --error: #ff6b6b;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

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

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.25rem;
}

.header-main {
  flex: 1;
  min-width: 0;
}

.header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

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

.layout {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.hidden {
  display: none !important;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(91, 140, 255, 0.06);
}

.hint {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0.5rem 0 0;
}

.hint.inline {
  display: block;
  margin-top: 0.25rem;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  text-decoration: underline;
  padding: 0;
}

.preview-grid,
.result-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .preview-grid,
  .result-grid {
    grid-template-columns: 1fr 220px;
    align-items: start;
  }
}

video,
#result-image {
  width: 100%;
  max-height: 360px;
  object-fit: contain;
  background: #000;
  border-radius: 8px;
}

.meta-list {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.meta-list dt {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.meta-list dd {
  margin: 0.15rem 0 0;
  font-weight: 600;
}

.settings-form {
  display: grid;
  gap: 1.25rem;
}

.settings-form fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 0;
  padding: 0.75rem 1rem 1rem;
}

.settings-form legend {
  padding: 0 0.35rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: grid;
  gap: 0.5rem;
  font-size: 0.9rem;
}

input[type="number"],
input[type="range"] {
  width: 100%;
}

input[type="number"] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.5rem 0.65rem;
}

output {
  color: var(--accent);
  font-weight: 600;
}

.primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
}

.primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.download-btn {
  margin-top: 1rem;
  width: 100%;
}

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

.status.info { color: var(--muted); }
.status.success { color: var(--success); }
.status.error { color: var(--error); }

.progress-wrap {
  margin-top: 1rem;
}

.progress-bar {
  height: 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #7aa1ff);
  border-radius: 999px;
  transition: width 0.2s ease;
}

.progress-label {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
  text-align: center;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toggle-title {
  font-size: 0.9rem;
  min-width: 4.5rem;
}

.toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-track {
  width: 44px;
  height: 24px;
  background: var(--border);
  border-radius: 999px;
  transition: background 0.15s;
  position: relative;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.15s;
}

.toggle input:checked + .toggle-track {
  background: var(--accent);
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(20px);
}

#repeat-value {
  min-width: 2rem;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.lang-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color 0.15s;
}

.lang-label.active {
  color: var(--accent);
}

.lang-toggle .toggle-track {
  width: 40px;
}