:root {
  color-scheme: light;
  --bg: #e7edf3;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #637083;
  --line: #cfd8e3;
  --accent: #0f7f7a;
  --accent-dark: #09615e;
  --danger: #a33a35;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(320px, 460px) minmax(0, 1fr);
  gap: 18px;
  width: min(1500px, calc(100vw - 32px));
  margin: 16px auto;
}

.panel,
.preview-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.controls {
  padding: 18px;
  align-self: start;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 22px;
  line-height: 1.25;
}

h2 {
  font-size: 18px;
}

form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.field {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
}

.field input {
  width: 100%;
}

input[type="file"],
input[type="number"] {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px;
  background: #f8fafc;
  color: var(--ink);
}

.grid-three {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.switch-row {
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--ink);
}

.mode-box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #f8fafc;
  color: var(--ink);
  font-size: 14px;
}

.mode-box span {
  color: var(--muted);
  font-size: 13px;
}

.compact {
  max-width: 180px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 14px;
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
  font-weight: 600;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

button.primary:hover:not(:disabled) {
  background: var(--accent-dark);
}

.status {
  min-height: 22px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 14px;
}

.preview-panel {
  min-height: calc(100vh - 32px);
  padding: 14px;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 4px 4px 12px;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.preview-toolbar a,
.download-actions a {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  background: #ffffff;
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.preview-stage {
  display: grid;
  min-height: 560px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.preview-stage object {
  display: none;
  width: min(100%, 980px);
  max-height: 72vh;
  min-height: 560px;
  object-fit: contain;
}

.warnings {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  color: var(--danger);
  font-size: 14px;
}

.file-list {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.part-group {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fbfdff;
}

.part-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.part-group h3 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0;
}

.part-preview-grid {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.part-preview {
  width: 100%;
  min-height: 190px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
}

.color-files {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 8px;
}

.file-list a,
.part-download {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 10px;
  background: #ffffff;
  color: var(--ink);
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: none;
}

.color-files a::after,
.part-download::after {
  content: " 下载";
  color: var(--accent-dark);
  font-weight: 700;
}

.empty-part {
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

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

  .preview-panel {
    min-height: auto;
  }

  .preview-stage {
    min-height: 360px;
  }

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