:root {
  --bg: #f3efe7;
  --panel: #e7dfd1;
  --panel-2: #ddd2c0;
  --ink: #2c241b;
  --muted: #6f6558;
  --accent: #7b5e3b;
  --accent-2: #5e7d6a;
  --danger: #9b4d3a;
  --card-bg: #fffdf8;
  --card-ink: #1f1a14;
  --border: #b8ab96;
  --shadow: 0 12px 30px rgba(45, 35, 25, 0.12);
  --radius: 10px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(123, 94, 59, 0.08), transparent 28%),
    radial-gradient(circle at top right, rgba(94, 125, 106, 0.08), transparent 24%),
    linear-gradient(180deg, #f5f1e8 0%, #ece4d7 100%);
  min-height: 100vh;
}

.app {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 20px;
  padding: 20px;
  min-height: 100vh;
}

.panel {
  background: linear-gradient(180deg, rgba(255, 253, 248, 0.96), rgba(239, 232, 220, 0.96));
  border: 1px solid rgba(111, 101, 88, 0.18);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 40px);
}

.panel-header {
  padding: 18px 20px 12px;
  border-bottom: 1px solid rgba(111, 101, 88, 0.16);
}

.panel-header h1,
.panel-header h2 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.panel-header p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.panel-body {
  padding: 16px 20px 20px;
  overflow: auto;
}

.field { margin-bottom: 14px; }
.field label {
  display: block;
  font-size: 0.84rem;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid rgba(111, 101, 88, 0.22);
  background: rgba(255, 253, 248, 0.9);
  color: var(--ink);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  outline: none;
}

textarea:focus,
input:focus,
select:focus {
  border-color: rgba(123, 94, 59, 0.5);
  box-shadow: 0 0 0 3px rgba(123, 94, 59, 0.12);
}

textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.45;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 11px 14px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  color: #fffdf8;
  background: linear-gradient(135deg, var(--accent), #6a5132);
  box-shadow: 0 6px 18px rgba(123, 94, 59, 0.18);
}

button.secondary {
  background: rgba(255, 253, 248, 0.75);
  color: var(--ink);
  box-shadow: none;
  border: 1px solid rgba(111, 101, 88, 0.22);
}

button.danger {
  background: linear-gradient(135deg, var(--danger), #7e3d2f);
  box-shadow: 0 6px 18px rgba(155, 77, 58, 0.18);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.preview-wrap {
  display: grid;
  grid-template-rows: auto auto 1fr;
  min-height: calc(100vh - 40px);
}

.summary {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid rgba(111, 101, 88, 0.16);
  color: var(--muted);
  font-size: 0.92rem;
}

.summary strong { color: var(--ink); }

.pages {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  padding: 20px;
  align-content: start;
  overflow: auto;
}

.page-card {
  background: #e8e0d2;
  color: #111;
  border-radius: 10px;
  box-shadow: 0 12px 28px rgba(45, 35, 25, 0.14);
  padding: 12px;
}

.page-card h3 {
  margin: 0 0 10px;
  color: #5a4d3d;
  font-size: 0.92rem;
}

canvas.preview-page {
  width: 100%;
  height: auto;
  display: block;
  background: #fffdf8;
  border: 1px solid #b8ab96;
}

details {
  border: 1px solid rgba(111, 101, 88, 0.18);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  background: rgba(255, 251, 244, 0.72);
}

summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
}

.help {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
  margin-top: 6px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(123, 94, 59, 0.08);
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid rgba(123, 94, 59, 0.14);
}

@media (max-width: 1100px) {
  .app { grid-template-columns: 1fr; }
  .sidebar, .preview-wrap { min-height: auto; }
}