:root {
  --bg: #f3f4f7;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-solid: #ffffff;
  --border: #d8dbe2;
  --border-strong: #c6cad4;
  --text: #2e3440;
  --muted: #7b8494;
  --shadow: 0 14px 34px rgba(24, 39, 75, 0.12);
  --blue: #4c8bf5;
  --blue-soft: rgba(76, 139, 245, 0.14);
  --green: #7fb96f;
  --danger: #d96a6a;
  --input-bg: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
}

/* Global */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, #ffd167 0%, #fffafa 50%, #c9d982 100%);
  color: var(--text);
  padding: 16px;
}

/* Window */
.window {
  width: 900px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.window.lggc {
  --lggc-radius: 24px;
  --lggc-padding: 0;
  --lggc-blur: 16px;

  display: block;
  min-width: 0;
  min-height: 0;
  padding: 0;
}

/* Title or Header */
.titlebar {
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.titlebar h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.2px;
  color: #333a47;
}

/* Layout */
.content {
  display: grid;
  grid-template-columns: 366px 1fr;
  gap: 22px;
  padding: 12px;
}

.left {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Panels */
.group {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 16px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.group.disabled {
  opacity: 0.55;
  filter: grayscale(0.05);
}

/* Form */
.fields {
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  grid-template-columns: 112px 1fr auto;
  align-items: center;
  gap: 10px;
}

.field.two-col {
  grid-template-columns: 112px 1fr;
}

.label {
  font-size: 14px;
  color: #394150;
  white-space: nowrap;
}

.input,
.select {
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--input-bg);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.8),
    0 1px 2px rgba(0, 0, 0, 0.03);
  color: var(--text);
  font-size: 14px;
}

.input,
.select {
  width: 100%;
  padding: 0 12px;
  outline: none;
  transition: 0.18s ease;
}

.input:focus,
.select:focus {
  border-color: var(--blue);
  box-shadow:
    0 0 0 4px var(--blue-soft),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

/* Select Dropdown */
.select-wrap {
  position: relative;
}

.select {
  appearance: none;
  padding-right: 34px;
  cursor: pointer;
}

.select-wrap::after {
  content: "▾";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-52%);
  color: #70798a;
  pointer-events: none;
  font-size: 13px;
}

.tiny-btn {
  width: 36px;
  padding: 0;
  cursor: pointer;
  background: linear-gradient(180deg, #ffffff 0%, #f1f3f7 100%);
}

/* Preview */
.preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 0;
}

.paper {
  --preview-scale: 0.62;
  width: 450px;
  height: 560px;
  border-radius: 14px;
  border: 1px solid #d7dbe3;
  background: linear-gradient(180deg, #ffffff, #fefefe);
  box-shadow: 0 10px 10px rgba(16, 24, 40, 0.03);
  position: relative;
  padding: 20px;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.preview-viewport {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow: hidden;
}

.preview-stage {
  position: relative;
  flex: 0 0 auto;
  /* Final preview width = real page width × current scale */
  width: calc(var(--preview-page-width, 210mm) * var(--preview-scale, 0.62));
  height: calc(var(--preview-page-height, 297mm) * var(--preview-scale, 0.62));
  overflow: hidden;
}

.preview-iframe {
  position: absolute;
  inset: 0 auto auto 0;
  width: var(--preview-page-width, 210mm);
  height: var(--preview-page-height, 297mm);
  border: none;
  display: block;
  background: #fff;
  transform-origin: top left;
  transform: scale(var(--preview-scale, 0.62));
}

.sheet-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 10px;
  min-height: 54px;
}

.brand {
  line-height: 1.15;
  text-align: center;
}

.brand .name {
  font-size: 18px;
  font-weight: 700;
  color: #e8b84a;
  letter-spacing: 0.2px;
}

.brand .sub {
  font-size: 14px;
  font-weight: 700;
  color: #afc25d;
  margin-top: 3px;
}

.pattern-size {
  position: absolute;
  right: 34px;
  top: 66px;
  font-size: 12px;
  color: #8b93a3;
  letter-spacing: 0.2px;
}

/* Pattern Area */
.pattern {
  position: absolute;
  left: 32px;
  right: 32px;
  top: 110px;
  bottom: 34px;
  border: 1px dashed #dfe3ea;
  border-radius: 2px;
  background: linear-gradient(
    180deg,
    rgba(247, 248, 251, 0.3),
    rgba(255, 255, 255, 0.1)
  );
}

.preview-label {
  margin-top: 12px;
  font-size: 14px;
  color: #4a5364;
  font-weight: 600;
}

.margins-box {
  min-height: 102px;
  display: flex;
  align-items: center;
  color: #2d2d2d;
  line-height: 1.7;
  font-size: 14px;
}

.actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  padding: 0 22px 24px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.1);
}

.btn.cancel .icon {
  color: var(--danger);
}
.btn.cancel {
  background: linear-gradient(180deg, #fffbfb 0%, #ffebeb 100%);
}
.btn.ok {
  border-color: #93b887;
  background: linear-gradient(180deg, #fcfffb 0%, #edf7ea 100%);
}
.btn.ok .icon {
  color: var(--green);
}

.error-msg {
  color: #d93025;
  font-size: 12px;
  margin-top: -12px; /* Keep the error message close to its related input field. */
  max-height: 12px;
  visibility: hidden;
  grid-column: 1 / -1;
}

.fields:has(> .error-msg:last-child) {
  margin-bottom: -12px;
}