:root {
  color-scheme: light;
  --bg: #f7f7f5;
  --panel: #ffffff;
  --border: #ddd;
  --text: #1a1a1a;
  --muted: #666;
  --accent: #2f5fda;
  --warning-bg: #fff4e5;
  --warning-text: #7a4a00;
}

* {
  box-sizing: border-box;
}

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

.app-header {
  padding: 24px 20px 8px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 1.4rem;
}

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

.layout {
  display: grid;
  grid-template-columns: minmax(260px, 340px) 1fr;
  gap: 24px;
  padding: 20px;
  max-width: 1100px;
  margin: 0 auto;
}

@media (max-width: 720px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: start;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: none;
  padding: 0;
  margin: 0;
}

.field legend {
  font-weight: 600;
  padding: 0;
  margin-bottom: 4px;
}

.field span {
  font-weight: 600;
  font-size: 0.9rem;
}

input[type="text"],
select {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
}

.radio {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.hint {
  margin: 4px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
  margin: 0;
}

button {
  padding: 10px 14px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  cursor: pointer;
}

button:disabled {
  background: #aab4d6;
  cursor: not-allowed;
}

.previews {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.preview-block h2 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.preview-frame {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.preview-frame img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.phone-frame {
  width: 375px;
  max-width: 100%;
  margin: 0 auto;
  border: 10px solid #1a1a1a;
  border-radius: 28px;
  padding: 6px;
  background: #1a1a1a;
}

.phone-screen {
  background: var(--panel);
  border-radius: 18px;
  overflow: hidden;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.phone-screen img {
  width: 100%;
  height: auto;
  display: block;
}

.app-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 20px 32px;
  color: var(--muted);
  font-size: 0.8rem;
}

code {
  background: #eee;
  padding: 1px 5px;
  border-radius: 4px;
}