:root {
  --panel-bg: #fbf4ea;
  --panel-border: #d8c4aa;
  --panel-shadow: rgba(98, 61, 33, 0.12);
  --canvas-bg: #f3ede3;
  --ink: #3f2a1d;
  --muted: #7b6656;
  --accent: #d96c52;
  --accent-dark: #b65139;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(249, 208, 177, 0.55), transparent 30%),
    linear-gradient(135deg, #f5ede1 0%, #f4f0ea 52%, #ebe2d3 100%);
}

.app-shell {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 24px;
}

.control-panel,
.preview-card {
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  background: rgba(255, 250, 244, 0.92);
  box-shadow: 0 18px 40px var(--panel-shadow);
}

.control-panel {
  position: sticky;
  top: 24px;
  width: min(360px, 100%);
  padding: 24px;
}

.panel-header h1,
.preview-header h2,
.control-group h2 {
  margin: 0;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.panel-copy,
.preview-header p,
.hint-text {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.control-group {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(121, 89, 62, 0.14);
}

.control-group label {
  display: grid;
  gap: 12px;
}

.grid-size {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.control-group label {
  margin-top: 12px;
}

.control-group span {
  font-size: 0.92rem;
  font-weight: 600;
}

input,
select,
button {
  font: inherit;
}

input[type="color"],
input[type="file"],
input[type="number"],
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d5c1a6;
  border-radius: 14px;
  background: var(--white);
  color: var(--ink);
}

input[type="color"] {
  min-height: 48px;
  padding: 6px;
}

button {
  border: none;
  border-radius: 14px;
  padding: 12px 16px;
  background: var(--accent);
  color: var(--white);
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
  box-shadow: 0 10px 18px rgba(217, 108, 82, 0.24);
}

button:hover {
  transform: translateY(-1px);
  background: var(--accent-dark);
}

.ghost-button {
  background: #efe2d1;
  color: var(--ink);
  box-shadow: none;
}

.ghost-button:hover {
  background: #e2d0b8;
}

.button-row {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.button-row button {
  flex: 1;
}

.preview-panel {
  flex: 1;
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.preview-card {
  padding: 18px;
}

.preview-card canvas {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 16px;
  border-radius: 18px;
  background: var(--canvas-bg);
}

@media (max-width: 1100px) {
  .app-shell {
    flex-direction: column;
  }

  .control-panel {
    position: static;
    width: 100%;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 16px;
    gap: 16px;
  }

  .preview-panel {
    grid-template-columns: 1fr;
  }

  .button-row {
    flex-direction: column;
  }

  .grid-size {
    grid-template-columns: 1fr;
  }
}