:root {
  --paper: #f7efe8;
  --panel: rgba(255, 250, 246, 0.9);
  --panel-strong: #fffaf6;
  --ink: #1f2630;
  --muted: #6a6972;
  --line: rgba(31, 38, 48, 0.12);
  --accent: #f45757;
  --accent-deep: #ce3e3e;
  --shadow: 0 24px 60px rgba(66, 33, 20, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(244, 87, 87, 0.12), transparent 28%),
    linear-gradient(135deg, #fdf7f2 0%, #f4eee5 52%, #ebe5db 100%);
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 24px;
  padding: 24px;
}

.control-panel,
.preview-card {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.control-panel {
  position: sticky;
  top: 24px;
  align-self: start;
  padding: 24px;
}

.panel-header h1,
.preview-head h2,
.panel-section h2 {
  margin: 0;
  font-family: "Trebuchet MS", "PingFang SC", sans-serif;
}

.panel-copy,
.section-headline p,
.preview-head p,
.export-note,
.field-label,
.field span,
.status {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.panel-section {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.field,
.field-group {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.field input,
.field select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid rgba(31, 38, 48, 0.14);
  border-radius: 14px;
  background: var(--panel-strong);
  color: var(--ink);
}

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

.radio-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid rgba(31, 38, 48, 0.1);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.45);
}

.select-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.cell-control {
  display: grid;
  gap: 6px;
}

.cell-control span {
  font-size: 12px;
  color: var(--muted);
}

.cell-control select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(31, 38, 48, 0.14);
  border-radius: 12px;
  background: var(--panel-strong);
}

.number-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.number-row-label {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.shared-number-row[hidden] {
  display: none;
}

.export-panel {
  display: grid;
  gap: 16px;
}

.export-panel .field {
  margin-top: 0;
  gap: 10px;
}

.export-panel .field span {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.export-panel .field select {
  min-height: 52px;
  padding: 13px 14px;
  font-size: 16px;
}

.preview-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  gap: 24px;
}

.spread-card {
  grid-column: 1 / -1;
}

.preview-card {
  padding: 18px;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.preview-head p {
  margin: 0;
  font-size: 13px;
}

.canvas-frame {
  padding: 16px;
  border-radius: 22px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(245, 237, 229, 0.92));
  border: 1px solid rgba(31, 38, 48, 0.08);
  overflow: auto;
}

.canvas-frame canvas {
  display: block;
  margin: 0 auto;
  width: min(100%, 360px);
  height: auto;
  background: #ffffff;
  border-radius: 16px;
}

.spread-frame canvas {
  width: min(100%, 900px);
}

.primary-button {
  border: none;
  border-radius: 16px;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  cursor: pointer;
}

.primary-button:hover {
  filter: brightness(1.03);
}

.export-actions {
  display: grid;
  grid-template-columns: 60% 40%;
  gap: 12px;
  align-items: stretch;
  margin-top: 4px;
}

.export-actions .primary-button,
.export-actions .secondary-button {
  width: 100%;
}

.secondary-button {
  border: 1px solid rgba(31, 38, 48, 0.14);
  border-radius: 16px;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background: var(--panel-strong);
  cursor: pointer;
}

.secondary-button:hover {
  background: rgba(255, 255, 255, 0.98);
}

.status {
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(31, 38, 48, 0.08);
}

.status-idle {
  color: var(--muted);
}

.status-error {
  color: #8e1d1d;
  background: rgba(255, 233, 233, 0.95);
  border-color: rgba(196, 72, 72, 0.24);
}

.status-success {
  color: #195738;
  background: rgba(231, 248, 239, 0.95);
  border-color: rgba(61, 148, 95, 0.24);
}

@media (max-width: 1120px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .control-panel {
    position: static;
  }
}

@media (max-width: 760px) {
  .app-shell,
  .preview-panel {
    gap: 18px;
    padding: 18px;
  }

  .export-actions {
    grid-template-columns: 1fr;
  }

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

  .spread-card {
    grid-column: auto;
  }

  .canvas-frame canvas,
  .spread-frame canvas {
    width: 100%;
  }
}