:root {
  --bg: #f5f5f7;
  --card-bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --border: #d2d2d7;
  --accent: #0071e3;
  --accent-hover: #0060c2;
  --danger: #d70015;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --card-bg: #2c2c2e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --border: #3a3a3c;
    --accent: #0a84ff;
    --accent-hover: #3d9bff;
    --danger: #ff453a;
  }
}

* { box-sizing: border-box; }

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 1.6rem;
}

header p {
  margin: 0 0 24px;
  color: var(--muted);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}

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

.hint {
  font-weight: normal;
  font-size: 0.8rem;
  color: var(--muted);
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}

textarea, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
}

textarea:focus, input:focus {
  outline: none;
  border-color: var(--accent);
}

.row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-top: 12px;
}

.row > div { flex: 1; min-width: 160px; }

.align-end { display: flex; }

button {
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}

button:hover { background: var(--bg); }

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.primary:hover { background: var(--accent-hover); }

.char-form { align-items: center; }
.char-form input { flex: 1; }

.character-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.character-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 8px 6px 14px;
  font-size: 0.85rem;
}

.character-chip strong { font-weight: 600; }
.character-chip .desc { color: var(--muted); }

.character-chip button {
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--danger);
  border-color: transparent;
}

.segments-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty-state {
  color: var(--muted);
  font-size: 0.9rem;
}

.segment-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.segment-card h3 {
  margin: 0 0 12px;
  font-size: 0.95rem;
  color: var(--accent);
}

.segment-field { margin-bottom: 12px; }
.segment-field:last-child { margin-bottom: 0; }

.char-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.char-checkboxes label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
  font-size: 0.9rem;
  margin-bottom: 0;
}

.char-checkboxes input { width: auto; }

.output-controls { align-items: center; }
.radio { display: flex; align-items: center; gap: 6px; width: auto; font-size: 0.9rem; }
.radio input { width: auto; }

#output { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85rem; }

.file-label {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  cursor: pointer;
  font-size: 0.9rem;
  margin: 0;
}

.file-label input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
}