:root {
  color-scheme: light dark;
  --bg: #0f1419;
  --panel: #1a2332;
  --text: #e7ecf3;
  --muted: #9aa7b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #2d3a4d;
  --error: #f87171;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: linear-gradient(180deg, #0b1017 0%, #121a26 100%);
  color: var(--text);
  min-height: 100vh;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

header p, .hint {
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-top: 1.25rem;
}

section h2 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.form-section + .form-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.section-desc {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.hint strong {
  color: var(--text);
  font-weight: 600;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.field-card {
  background: #0f1419;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.field-card label {
  flex: 1;
}

.field-card-full {
  margin-top: 0.75rem;
}

.field-figure,
.mode-figure,
.section-visual {
  margin: 0;
}

.field-visual {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.field-visual-wide {
  max-height: 110px;
}

.field-visual-compact {
  max-height: 56px;
}

.section-visual {
  margin-bottom: 1.25rem;
}

.visual-caption {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

.mode-option {
  display: grid;
  grid-template-columns: minmax(140px, 180px) 1fr;
  gap: 0.75rem;
  align-items: center;
  margin: 0.65rem 0;
}

.mode-option .radio {
  margin: 0;
}

@media (max-width: 520px) {
  .mode-option {
    grid-template-columns: 1fr;
  }
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.92rem;
}

label .hint {
  font-size: 0.82rem;
  line-height: 1.4;
}

input[type="number"] {
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1419;
  color: var(--text);
  font-size: 1rem;
}

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

.mode-group legend {
  padding: 0 0.35rem;
  color: var(--muted);
}

.radio {
  flex-direction: row;
  align-items: flex-start;
  gap: 0.6rem;
  margin: 0.5rem 0;
}

.actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

button {
  border: none;
  border-radius: 8px;
  padding: 0.7rem 1.1rem;
  font-size: 0.95rem;
  cursor: pointer;
}

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

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

button.primary:disabled {
  opacity: 0.65;
  cursor: wait;
}

.download-ready {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.download-ready p {
  margin: 0 0 0.75rem;
}

.download-link {
  display: inline-block;
  padding: 0.7rem 1.1rem;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
}

.download-link:hover {
  background: var(--accent-hover);
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border);
}

.error {
  color: var(--error);
  margin-top: 1rem;
}

.hidden {
  display: none !important;
}

#increment-field.disabled {
  opacity: 0.45;
  pointer-events: none;
}