:root {
  --bg: #0f1218;
  --panel: #171c26;
  --panel-2: #1d2430;
  --line: #2b3545;
  --text: #f5f7fb;
  --muted: #aab3c2;
  --green: #4ade80;
  --purple: #8b5cf6;
  --yellow: #facc15;
  --red: #fb7185;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(139, 92, 246, 0.20), transparent 34rem), radial-gradient(circle at bottom right, rgba(74, 222, 128, 0.10), transparent 28rem), var(--bg);
}
.shell { width: min(1500px, calc(100vw - 32px)); margin: 0 auto; padding: 24px 0 36px; }
h1, h2 { margin: 0; }
h1 { font-size: 30px; letter-spacing: -0.03em; }
h2 { font-size: 18px; }
p { margin: 8px 0 0; }
.hidden { display: none !important; }
.eyebrow { color: var(--green); font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; }
.card { background: linear-gradient(180deg, rgba(255,255,255,0.045), rgba(255,255,255,0.015)), var(--panel); border: 1px solid rgba(255,255,255,0.08); border-radius: 18px; box-shadow: 0 20px 60px rgba(0,0,0,0.25); }
.hero { padding: 48px 34px; text-align: center; min-height: 360px; display: grid; place-items: center; gap: 12px; }
.app-mark { width: 64px; height: 64px; display: grid; place-items: center; margin: 0 auto; border-radius: 18px; font-size: 34px; background: rgba(139, 92, 246, 0.16); border: 1px solid rgba(139, 92, 246, 0.5); }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 18px; }
.workspace { display: grid; grid-template-columns: 380px 1fr; gap: 18px; align-items: start; }
.controls, .preview, .result-panel { padding: 20px; }
.controls { position: sticky; top: 16px; grid-row: 1 / span 2; }
.controls h2:not(:first-child) { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.result-panel { grid-column: 2; }
.muted { color: var(--muted); line-height: 1.45; font-size: 14px; }
.field-grid { display: grid; gap: 12px; margin-top: 14px; }
.field-grid.two { grid-template-columns: 1fr 1fr; }
label { display: grid; gap: 7px; color: #d9deea; font-size: 13px; font-weight: 650; }
input, button, .upload-button { border: 1px solid rgba(255,255,255,0.08); border-radius: 11px; padding: 11px 12px; font: inherit; }
input { width: 100%; color: var(--text); background: var(--panel-2); outline: none; }
input:focus { border-color: rgba(139, 92, 246, 0.8); box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.18); }
button, .upload-button { cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 750; }
.upload-button input { display: none; }
.upload-button { background: linear-gradient(135deg, #38d978, #79e28f); color: #08120c; }
.upload-button.big { margin-top: 18px; padding: 14px 18px; }
.primary { background: linear-gradient(135deg, #38d978, #79e28f); color: #08120c; }
.secondary { background: rgba(255,255,255,0.055); color: var(--text); }
.full { width: 100%; }
.small { padding: 8px 10px; border-radius: 9px; }
.button-row { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 16px; }
.checkbox-line { display: flex; grid-template-columns: none; align-items: center; gap: 10px; margin-top: 14px; color: var(--muted); }
.checkbox-line input { width: 18px; height: 18px; }
.status { min-height: 20px; }
.preview-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
#zoomLabel { color: var(--muted); min-width: 36px; text-align: center; }
.stats { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.stats span { padding: 8px 10px; border-radius: 999px; background: rgba(255,255,255,0.05); color: var(--muted); font-size: 13px; }
.stats strong { color: var(--text); }
.sheet-scroll { max-height: 680px; overflow: auto; border-radius: 14px; border: 1px solid var(--line); background: #0b0e13; padding: 14px; }
#sheetCanvas { image-rendering: pixelated; display: block; cursor: crosshair; }
.frames { display: grid; grid-template-columns: repeat(auto-fill, minmax(116px, 1fr)); gap: 14px; }
.frame-card { background: var(--panel-2); border: 1px solid rgba(255,255,255,0.07); border-radius: 15px; padding: 12px; text-align: center; }
.frame-card img { width: 82px; height: 82px; object-fit: contain; image-rendering: pixelated; background: repeating-conic-gradient(#343b48 0% 25%, #252b36 0% 50%) 50% / 16px 16px; border-radius: 10px; border: 1px solid var(--line); }
.frame-card small { display: block; margin-top: 8px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 980px) { .workspace { grid-template-columns: 1fr; } .controls { position: static; grid-row: auto; } .result-panel { grid-column: auto; } .topbar { align-items: flex-start; flex-direction: column; } }