:root {
  --bg: #f4f4f7;
  --panel: #ffffff;
  --text: #1d1d27;
  --muted: #6b6b7b;
  --line: #e2e2ea;
  --accent: #3b46d6;
  --accent-ink: #ffffff;
  --danger: #c43a3a;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topbar { padding: 20px 24px 8px; max-width: 1400px; margin: 0 auto; }
.topbar h1 { margin: 0; font-size: 22px; letter-spacing: -0.01em; }
.tagline { margin: 4px 0 0; color: var(--muted); }

.layout {
  display: grid;
  grid-template-columns: minmax(340px, 440px) 1fr;
  gap: 20px;
  padding: 16px 24px 32px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}

.preview { position: sticky; top: 16px; }

.group + .group { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.group h2, .preview h2 { margin: 0 0 10px; font-size: 15px; }
.group-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.count { color: var(--muted); font-size: 13px; }
.hint { color: var(--muted); font-size: 12.5px; margin: 0 0 10px; }

button {
  font: inherit;
  border: 1px solid var(--line);
  background: #fafafc;
  color: var(--text);
  padding: 7px 12px;
  border-radius: 8px;
  cursor: pointer;
}
button:hover { border-color: #c9c9d6; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.primary:hover { filter: brightness(1.08); }
button.ghost { background: transparent; }
button.danger { color: var(--danger); }

/* Logos */
.logo-list { list-style: none; margin: 0 0 10px; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.logo-list:empty { display: none; }
.logo-item {
  display: grid; grid-template-columns: 96px 1fr auto; gap: 12px; align-items: center;
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; background: #fbfbfd;
}
.logo-item img { max-width: 96px; max-height: 40px; justify-self: center; }
.logo-scale { display: flex; flex-direction: column; gap: 2px; font-size: 12px; color: var(--muted); }
.logo-scale input { width: 100%; accent-color: var(--accent); }
.logo-scale output { color: var(--text); font-variant-numeric: tabular-nums; }
.logo-btns { display: flex; gap: 4px; }
.logo-btns button { padding: 3px 9px; font-size: 15px; line-height: 1.2; }
.logo-btns button:disabled { opacity: 0.35; cursor: default; }
.logo-drop {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 76px;
  border: 1.5px dashed #c9c9d6;
  border-radius: var(--radius);
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  padding: 12px;
  background: #fbfbfd;
}
.logo-drop[hidden] { display: none; }
.logo-drop.over, .logo-drop:focus-visible { border-color: var(--accent); outline: none; background: #f2f3ff; }

/* Grid */
.grid-wrap { max-height: 360px; overflow: auto; border: 1px solid var(--line); border-radius: 8px; }
.grid { width: 100%; border-collapse: collapse; table-layout: fixed; }
.grid th {
  position: sticky; top: 0; z-index: 1;
  background: #f6f6f9;
  font-size: 12px; font-weight: 600; color: var(--muted);
  text-align: left; padding: 6px 8px;
  border-bottom: 1px solid var(--line);
}
.grid td { border-bottom: 1px solid var(--line); padding: 0; }
.grid td + td { border-left: 1px solid var(--line); }
.grid .rownum { width: 34px; text-align: center; color: #a0a0ae; font-size: 11.5px; background: #fafafc; }
.grid .del { width: 30px; text-align: center; }
.grid .del button { border: 0; background: none; color: #b0b0bc; padding: 2px 6px; font-size: 16px; line-height: 1; }
.grid .del button:hover { color: var(--danger); }
.grid input {
  width: 100%; border: 0; padding: 7px 8px; font: inherit; background: transparent; color: var(--text);
}
.grid input:focus { outline: 2px solid var(--accent); outline-offset: -2px; background: #f7f8ff; }
.row-actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }

/* Settings */
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.fields label { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--muted); }
.fields label[hidden] { display: none; }
.fields label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); }
.fields select, .fields input[type="file"] {
  font: inherit; padding: 6px 8px; border: 1px solid var(--line); border-radius: 7px; background: #fff; color: var(--text);
}
.fields input[type="color"] { width: 100%; height: 32px; border: 1px solid var(--line); border-radius: 7px; padding: 2px; background: #fff; }
.fields input[type="range"] { width: 100%; accent-color: var(--accent); }
.fields output { color: var(--text); font-variant-numeric: tabular-nums; }
.fields label:has(#fillBlanks) { grid-column: 1 / -1; }

/* Preview */
.actions { display: flex; align-items: center; gap: 12px; }
.status { color: var(--muted); font-size: 12.5px; }
.status.error { color: var(--danger); }
.sheet-wrap {
  background: #e6e6ec;
  border-radius: 8px;
  overflow: auto;
  height: calc(100vh - 170px);
  min-height: 480px;
}
.pages { padding: 16px; display: flex; flex-direction: column; align-items: center; gap: 16px; }
.sheet { display: block; background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 6px 20px rgba(0, 0, 0, 0.08); }
.preview .hint { margin: 10px 0 0; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 12px 16px 24px; }
  .topbar { padding: 16px 16px 4px; }
  .preview { position: static; }
  .sheet-wrap { height: 70vh; }
}
@media (max-width: 480px) {
  .fields { grid-template-columns: 1fr; }
}