:root {
  color-scheme: light;
  --page-bg: #f6efe8;
  --panel-bg: rgba(255, 255, 255, 0.88);
  --panel-border: rgba(129, 92, 63, 0.18);
  --text-strong: #2f241a;
  --text-muted: #715e4d;
  --accent: #b24b42;
  --accent-soft: #fbe0db;
  --canvas-bg: #fff9f5;
  --shadow: 0 18px 40px rgba(70, 43, 22, 0.12);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text-strong);
  background:
    radial-gradient(circle at top left, rgba(244, 87, 87, 0.12), transparent 28%),
    radial-gradient(circle at bottom right, rgba(217, 166, 76, 0.14), transparent 24%),
    linear-gradient(135deg, #f3eadf 0%, #f7f2ec 50%, #fcfaf8 100%);
}

.app-shell {
  width: min(1440px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 32px;
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.panel,
.preview-card,
.preview-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel {
  padding: 24px;
}

.control-panel {
  position: sticky;
  top: 20px;
}

.panel-header h1,
.preview-header h2,
.preview-panel-header h2 {
  margin: 0;
  font-weight: 700;
}

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

.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.control-grid-secondary {
  margin-top: 16px;
}

.control {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}

.control-span-full {
  grid-column: 1 / -1;
}

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

.dimension-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dimension-field span {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
}

.control span {
  color: var(--text-muted);
  font-weight: 600;
}

.control input,
.control select,
.control button {
  width: 100%;
}

input,
select,
button {
  font: inherit;
  border-radius: 12px;
}

input,
select {
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid rgba(137, 101, 76, 0.22);
  background: #fffdfa;
  color: var(--text-strong);
}

.control-file input {
  padding: 10px 12px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

button {
  min-height: 46px;
  padding: 0 16px;
  border: 0;
  background: linear-gradient(135deg, #b24b42 0%, #cc695c 100%);
  color: #fff9f8;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    opacity 160ms ease;
  box-shadow: 0 10px 24px rgba(178, 75, 66, 0.28);
}

button:hover {
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
  box-shadow: 0 6px 14px rgba(178, 75, 66, 0.24);
}

.status-box {
  min-height: 54px;
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(178, 75, 66, 0.18);
  background: #fffaf8;
  line-height: 1.5;
  white-space: pre-wrap;
}

.status-box[data-tone="error"] {
  color: #872c24;
  background: #fff2ef;
  border-color: rgba(196, 69, 55, 0.28);
}

.status-box[data-tone="success"] {
  color: #34533c;
  background: #f3fbf2;
  border-color: rgba(91, 150, 95, 0.28);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.preview-panel {
  padding: 18px;
}

.preview-panel-header {
  padding: 6px 6px 18px;
}

.preview-card {
  padding: 18px;
}

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

.interactive-canvas {
  cursor: pointer;
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100vw - 20px, 1440px);
    padding-top: 12px;
    grid-template-columns: 1fr;
  }

  .panel,
  .preview-card,
  .preview-panel {
    padding: 16px;
  }

  .control-panel {
    position: static;
  }

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

  .dimension-row {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }
}