:root {
  --bg: #090c10;
  --card: rgba(255,255,255,.065);
  --card-strong: rgba(255,255,255,.11);
  --text: #f7f1e8;
  --muted: #aaa196;
  --line: rgba(255,255,255,.14);
  --line-strong: rgba(255,255,255,.26);
  --accent: #9cffc7;
  --accent-2: #ffd36d;
  --danger: #ff8a8a;
  --shadow: 0 18px 48px rgba(0,0,0,.34);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% -12%, rgba(156,255,199,.16), transparent 35%),
    radial-gradient(circle at 86% 0%, rgba(255,211,109,.10), transparent 34%),
    linear-gradient(180deg, #151923 0%, var(--bg) 66%, #05070a 100%);
}
button, select, input {
  color: var(--text);
  background: var(--card-strong);
  border: 1px solid var(--line);
  border-radius: 11px;
  min-height: 34px;
  padding: 7px 9px;
  font: inherit;
}
button { cursor: pointer; font-weight: 900; }
button:hover:not(:disabled) { border-color: rgba(156,255,199,.65); transform: translateY(-1px); }
button:disabled { opacity: .45; cursor: not-allowed; }
input[type="range"] { accent-color: var(--accent); padding: 0; }
input[type="color"] { padding: 3px; width: 100%; }
input[type="file"] { display: none; }
label { color: var(--muted); font-size: .72rem; font-weight: 800; display: grid; gap: 4px; }
.app-shell { width: min(1600px, calc(100% - 24px)); margin: 0 auto; padding: 8px 0 18px; }
.topbar, .panel, .stage-card {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(15px);
}
.topbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(260px, 1fr);
  align-items: center;
  gap: 18px;
  padding: 12px 16px;
  margin-bottom: 12px;
}
.top-downloads {
  justify-self: end;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 230px; }
.brand-mark { width: 18px; height: 18px; border-radius: 5px; background: var(--accent); box-shadow: 0 0 24px rgba(156,255,199,.7); }
.brand p { margin: 0 0 2px; color: var(--accent); font-size: .66rem; text-transform: uppercase; letter-spacing: .16em; font-weight: 950; }
h1 { margin: 0; line-height: .95; font-size: clamp(1.3rem, 3vw, 2rem); letter-spacing: -.055em; }
.prompt-center {
  display: grid;
  justify-items: center;
  gap: 4px;
}
.copy-prompt {
  min-height: 46px;
  padding: 10px 18px;
  border-radius: 15px;
  border-color: rgba(255,255,255,.22);
  background: rgba(255,255,255,.09);
}
.copy-prompt.copied {
  border-color: rgba(156,255,199,.70);
  color: var(--accent);
}
#copyPromptNote {
  color: var(--muted);
  font-size: .68rem;
  text-align: center;
}
.top-downloads {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  justify-self: end;
  gap: 10px;
}
.hero-download {
  min-height: 54px;
  padding: 12px 22px;
  border-radius: 16px;
  border-color: rgba(156,255,199,.55);
  background: linear-gradient(180deg, rgba(156,255,199,.23), rgba(156,255,199,.08));
  box-shadow: 0 0 0 1px rgba(156,255,199,.14), 0 16px 40px rgba(0,0,0,.30);
  font-size: 1.05rem;
}
.block-download {
  min-height: 54px;
  padding: 10px 16px;
  border-radius: 16px;
  border-color: rgba(255,211,109,.35);
  background: rgba(255,211,109,.10);
  font-size: .88rem;
}
.workbench {
  display: grid;
  grid-template-columns: minmax(740px, 1fr) 430px;
  gap: 14px;
  align-items: start;
}
.main-column { display: grid; gap: 12px; }
.stage-card { padding: 12px; overflow: hidden; }
#gameCanvas {
  width: 100%;
  max-height: calc(100vh - 170px);
  aspect-ratio: 90 / 47;
  display: block;
  border-radius: 14px;
  background: #111720;
  image-rendering: pixelated;
  touch-action: manipulation;
}
.status-bar {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: .75rem;
  padding: 8px 2px 0;
}
.tool-rail { display: grid; gap: 12px; align-content: start; }
.panel { padding: 14px; }
.priority-card { border-color: rgba(156,255,199,.18); }
.panel-title { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.panel-title h2 { margin: 0; font-size: 1rem; letter-spacing: -.03em; }
.panel-title span, .tiny-note { color: var(--muted); font-size: .72rem; line-height: 1.35; }

.drop-button, .mini-upload {
  min-height: 56px;
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px dashed var(--line-strong);
  border-radius: 13px;
  background: rgba(0,0,0,.16);
  cursor: pointer;
}
.drop-button { padding: 12px; place-items: start; text-align: left; margin-bottom: 10px; }
.drop-button strong { color: var(--text); font-size: .92rem; }
.drop-button span { font-size: .74rem; color: var(--muted); }
.drop-button:hover, .mini-upload:hover { border-color: var(--accent); color: var(--text); }
.mini-controls { display: grid; grid-template-columns: 1.1fr .65fr .75fr 1fr; gap: 8px; align-items: end; }
.button-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 9px; }
#sheetPreview {
  width: 100%;
  aspect-ratio: 4 / 1;
  margin-top: 10px;
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  background-color: #0d1117;
  background-image:
    linear-gradient(45deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,.08) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,.08) 75%);
  background-size: 16px 16px;
  image-rendering: pixelated;
}

.controls-panel {
  border-color: rgba(255,211,109,.18);
}
.mobile-controls-panel { display: none; }
.mobile-controls button {
  min-height: 52px;
  line-height: 1.05;
}
.mobile-controls small {
  display: block;
  color: var(--muted);
  font-size: .66rem;
  margin-top: 3px;
}

.mobile-controls { display: grid; grid-template-columns: repeat(4,1fr); gap: 6px; margin-top: 10px; }
.mobile-controls button { min-height: 42px; padding: 6px; }

.settings-panel {
  padding: 0;
  overflow: hidden;
}
.settings-panel summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px 14px 44px;
  font-size: 1rem;
  font-weight: 950;
  letter-spacing: -.03em;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.settings-panel summary::before {
  content: "›";
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%) rotate(0deg);
  transform-origin: center;
  color: var(--accent);
  font-size: 1.35rem;
  transition: transform .16s ease;
}
.settings-panel[open] summary::before {
  transform: translateY(-50%) rotate(90deg);
}
.settings-panel summary::-webkit-details-marker { display: none; }
.settings-block {
  padding: 14px;
  display: grid;
  gap: 10px;
  border-bottom: 1px solid var(--line);
}
.settings-block:last-child { border-bottom: 0; }
.settings-block h3 {
  margin: 0;
  color: var(--accent-2);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .09em;
}
.play-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.checkline { display: flex; align-items: center; gap: 7px; margin-top: 2px; }
.checkline input { min-height: auto; }
.bg-panel .mini-upload, .settings-block .mini-upload { width: 100%; }
.settings-block > button { width: 100%; }

.under-stage {
  display: grid;
  grid-template-columns: 420px minmax(420px, 1fr);
  gap: 12px;
  align-items: start;
}
.inspector-toolbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr 1fr;
  gap: 8px;
  align-items: end;
}
#editFrameLabel { align-self: center; color: var(--accent-2); font-weight: 950; font-size: .82rem; white-space: nowrap; }
.frame-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin: 12px 0; }
.frame-btn {
  border: 1px solid var(--line);
  background: rgba(0,0,0,.2);
  border-radius: 11px;
  padding: 6px;
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: .68rem;
}
.frame-btn.selected { border-color: var(--accent); color: var(--text); box-shadow: 0 0 0 2px rgba(156,255,199,.12); }
.frame-btn canvas {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 7px;
  background-color: #111720;
  background-image:
    linear-gradient(45deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,.08) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,.08) 75%);
  background-size: 12px 12px;
  image-rendering: pixelated;
}
.frame-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  margin: -2px 0 12px;
}
.nudge-wrap { display: grid; grid-template-columns: 178px 1fr; gap: 12px; align-items: center; }
.nudge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}
.numeric-nudges { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.editor-layout { display: grid; grid-template-columns: minmax(320px, 1fr) 190px; gap: 14px; align-items: start; }
#pixelEditor {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-height: 560px;
  display: block;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background-color: #121820;
  background-image:
    linear-gradient(45deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,.08) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,.08) 75%);
  background-size: 16px 16px;
  image-rendering: pixelated;
  cursor: crosshair;
}
.editor-controls { display: grid; gap: 8px; }
.button-grid, .selection-nudges { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.save-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; margin-top: 8px; }
.saved-grid { display: grid; gap: 8px; margin-top: 10px; max-height: 340px; overflow: auto; padding-right: 4px; }
.saved-grid.compact { max-height: 220px; }
.saved-card {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 9px;
  align-items: center;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(0,0,0,.16);
}
.saved-card canvas { width: 44px; height: 44px; image-rendering: pixelated; background: #111720; border-radius: 8px; object-fit: cover; }
.saved-card.bg-thumb canvas { width: 60px; height: 34px; }
.saved-card strong { display: block; font-size: .78rem; }
.saved-card span { display: block; color: var(--muted); font-size: .68rem; }
.saved-card .card-actions { display: grid; grid-template-columns: 1fr; gap: 5px; }
.saved-card button { min-height: 28px; padding: 4px 7px; font-size: .7rem; }

@media (max-width: 1240px) {
  .workbench { grid-template-columns: 1fr; }
  .tool-rail { grid-template-columns: 1fr 1fr; }
  #gameCanvas { max-height: none; }
}
@media (max-width: 980px) {
  .topbar { grid-template-columns: 1fr; }
  .prompt-center { order: 2; }
  .top-downloads { order: 3; justify-self: stretch; }
  .brand { order: 1; }
  .under-stage { grid-template-columns: 1fr; }
  .tool-rail { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .app-shell { width: min(100% - 12px, 1600px); }
  .top-downloads { width: 100%; display: grid; grid-template-columns: 1fr; }
  .hero-download, .block-download { width: 100%; }
  .tool-rail .controls-panel { display: none; }
  .mobile-controls-panel { display: block; }
  .mini-controls, .inspector-toolbar { grid-template-columns: 1fr 1fr; display: grid; }
  .editor-layout, .nudge-wrap { grid-template-columns: 1fr; }
  .frame-actions { grid-template-columns: 1fr; }
}