:root {
  --blue: #0b3fa8;
  --blue-dark: #072a73;
  --red: #e8192c;
  --bg: #f4f6fb;
  --panel: #ffffff;
  --text: #1c2333;
  --muted: #6b7280;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  overflow-x: hidden;
}

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

.app { max-width: 1200px; margin: 0 auto; padding: 20px 16px 60px; }

.app-footer {
  text-align: center;
  margin-top: 32px;
  font-size: 0.8rem;
  color: var(--muted);
}

.app-header { text-align: center; margin-bottom: 20px; }
.app-header h1 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); margin: 0 0 6px; color: var(--blue-dark); }
.app-header p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  min-width: 0;
}

.form-panel, .preview-panel { min-width: 0; }

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 380px 1fr;
    align-items: start;
  }
}

.form-panel {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

@media (min-width: 900px) {
  .form-panel { position: sticky; top: 20px; }
}

.field { display: flex; flex-direction: column; gap: 6px; }

.field label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.field input, .field textarea {
  border: 1.5px solid #d9dee8;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: #fbfcfe;
  resize: vertical;
}

.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--blue);
  background: #fff;
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 6px;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 13px 18px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.05s ease, opacity 0.15s ease;
}
.btn:active { transform: scale(0.98); }

.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { opacity: 0.92; }

.btn-secondary { background: #e9edf5; color: var(--blue-dark); }
.btn-secondary:hover { opacity: 0.9; }

.preview-panel {
  display: flex;
  justify-content: center;
}

.canvas-wrap {
  width: 100%;
  max-width: 480px;
  min-width: 0;
  background: var(--panel);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

#art-canvas {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}