body {
  min-height: 100vh;
}

.builder {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: 3rem;
  padding: 8rem clamp(1.25rem, 6vw, 5rem) 6rem;
  max-width: 1280px;
  margin: 0 auto;
  align-items: start;
  position: relative;
  z-index: 2;
}

@media (max-width: 860px) {
  .builder {
    grid-template-columns: 1fr;
  }
}

.builder__preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  position: sticky;
  top: 6rem;
}

@media (max-width: 860px) {
  .builder__preview {
    position: static;
  }
}

.builder__canvas-frame {
  background:
    repeating-linear-gradient(
      135deg,
      var(--bg-1),
      var(--bg-1) 10px,
      var(--bg-2) 10px,
      var(--bg-2) 11px
    );
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 360px;
  width: 100%;
}

#previewCanvas {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid var(--line-strong);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35), 0 16px 32px -18px rgba(0, 0, 0, 0.55);
}

#downloadBtn {
  appearance: none;
  -webkit-appearance: none;
  border: none;
  cursor: pointer;
}

#downloadBtn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.builder__hint {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-2);
  text-align: center;
  max-width: 320px;
}

.builder__intro h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--ink-0);
  margin-bottom: 0.75rem;
}

.builder__intro p {
  color: var(--ink-1);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.field__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-1);
}

.field--fieldset {
  margin: 0 0 1.75rem;
  padding: 0;
  border: none;
  min-width: 0;
}

.field--fieldset > legend {
  padding: 0;
}

.field__row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.field__row[hidden] {
  display: none;
}

.field__hint {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-2);
}

.field__error {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
}

.field input[type="number"],
.field input[type="text"] {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--ink-0);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.6rem 0.75rem;
  width: 100%;
}

.field input[type="number"] {
  max-width: 8rem;
}

.field input:focus-visible,
.field select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field input[type="color"] {
  width: 3rem;
  height: 2.4rem;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--bg-2);
  cursor: pointer;
}

.field select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--ink-0);
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.6rem 0.75rem;
  width: 100%;
  cursor: pointer;
}

.field input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.mode-toggle {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
}

.mode-toggle label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-1);
  cursor: pointer;
}

.mode-toggle input {
  accent-color: var(--accent);
}