:root {
  --bg: #0f172a; --text: #f9fafb; --muted: #cbd5e1; --border: #334155;
  --accent: #38bdf8; --accent2: #facc15; --input: #0b1220; --shadow: rgba(0,0,0,.32);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: radial-gradient(circle at top left, rgba(56,189,248,.14), transparent 34%), radial-gradient(circle at bottom right, rgba(250,204,21,.09), transparent 28%), var(--bg); color: var(--text); min-height: 100vh; }
.shell { width: min(1440px, calc(100% - 32px)); margin: 0 auto; }
.site-header { padding: 28px 0 12px; }
.site-header h1 { margin: 0; font-size: clamp(1.7rem, 2.8vw, 2.7rem); letter-spacing: -0.04em; }
.site-header p { margin: 10px 0 0; color: var(--muted); max-width: 960px; line-height: 1.45; }
.version-chip { display:inline-block; margin-top:10px; padding:6px 10px; border:1px solid rgba(56,189,248,.35); color:#dbeafe; background:rgba(56,189,248,.08); border-radius:999px; font-size:.8rem; font-weight:700; }
.app-layout { display: grid; grid-template-columns: minmax(340px, 480px) minmax(620px, 1fr); gap: 24px; align-items: start; }
.card { background: linear-gradient(180deg, rgba(255,255,255,.055), rgba(255,255,255,.025)); border: 1px solid var(--border); border-radius: 22px; box-shadow: 0 18px 50px var(--shadow); }
.card-header { padding: 18px 18px 0; }
.card-header h2 { margin: 0; font-size: 1.05rem; }
.card-header p { margin: 6px 0 0; color: var(--muted); font-size: .9rem; line-height: 1.35; }
.controls { padding: 18px; display: grid; gap: 14px; }
.field { display: grid; gap: 7px; }
label { font-size: .86rem; color: #e5e7eb; font-weight: 650; }
input, select { width:100%; padding:11px 12px; border:1px solid var(--border); border-radius:12px; background:var(--input); color:var(--text); font:inherit; outline:none; }
input:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(56,189,248,.17); }
.grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.help { color:#9fb3ca; font-size:.78rem; line-height:1.35; }
.error { color:#fecaca; font-size:.78rem; min-height:1.1em; }
.mode-switch { display:flex; gap:10px; }
.mode-btn { flex:1; }
.hidden { display:none; }
details { border:1px solid var(--border); border-radius:16px; padding:12px; background:rgba(15,23,42,.45); }
summary { cursor:pointer; font-weight:750; color:#e5e7eb; }
.advanced { margin-top:14px; display:grid; gap:12px; }
.lock-label { display:inline-flex; gap:8px; align-items:center; font-size:.8rem; color:#cbd5e1; font-weight:500; }
.lock-label input { width:auto; margin:0; }
.range-row { display:grid; grid-template-columns:1fr auto; gap:10px; align-items:center; }
input[type="range"] { padding:0; accent-color:var(--accent); }
.btn-row { display:flex; flex-wrap:wrap; gap:10px; padding-top:4px; }
button { border:0; border-radius:999px; padding:11px 15px; font-weight:800; cursor:pointer; color:#07111f; background:var(--accent); box-shadow:0 8px 22px rgba(56,189,248,.18); transition:transform .12s ease, filter .12s ease; }
button:hover { transform:translateY(-1px); filter:brightness(1.06); }
button.secondary { color:var(--text); background:#334155; box-shadow:none; }
button.gold { background:var(--accent2); box-shadow:0 8px 22px rgba(250,204,21,.16); }
button.small { padding:8px 12px; font-size:.85rem; }
button:disabled { opacity:.6; cursor:not-allowed; }
.status { border-radius:12px; padding:10px 12px; font-size:.88rem; line-height:1.35; background:rgba(34,197,94,.08); border:1px solid rgba(34,197,94,.22); color:#dcfce7; }
.status.warn { background:rgba(245,158,11,.08); border-color:rgba(245,158,11,.24); color:#fde68a; }
.note { background:rgba(56,189,248,.09); border:1px solid rgba(56,189,248,.24); border-radius:16px; padding:13px; color:#dbeafe; font-size:.9rem; }
.debug-card { margin-top: 8px; border:1px solid var(--border); border-radius:16px; padding:12px; background:rgba(15,23,42,.35); }
.debug-card h3 { margin:0; font-size:.92rem; }
.debug-card p { margin:6px 0 0; color:var(--muted); font-size:.8rem; line-height:1.35; }
.debug-grid { margin-top:10px; display:grid; grid-template-columns:repeat(2, minmax(0, 1fr)); gap:10px; }
.debug-metric { border:1px solid rgba(255,255,255,.08); border-radius:12px; padding:10px; background:rgba(2,6,23,.42); }
.debug-label { color:#cbd5e1; font-size:.78rem; font-weight:700; }
.debug-value { margin-top:4px; font-size:.96rem; font-weight:800; }
.debug-meta { margin-top:3px; font-size:.75rem; color:#94a3b8; }
.debug-pass { color:#bbf7d0; }
.debug-warn { color:#fde68a; }
.preview-wrap { padding:18px; display:grid; gap:16px; }
.variation-section { display:grid; gap:12px; }
.variation-header h3 { margin:0; font-size:1rem; }
.variation-header p { margin:4px 0 0; color:var(--muted); font-size:.88rem; }
.variation-grid { display:grid; grid-template-columns:repeat(4, minmax(0, 1fr)); gap:12px; }
.variation-card { display:grid; gap:10px; align-items:center; justify-items:center; padding:12px; border-radius:18px; border:1px solid var(--border); background:rgba(15,23,42,.45); color:var(--text); box-shadow:none; }
.variation-card.active { border-color:var(--accent); box-shadow:0 0 0 2px rgba(56,189,248,.22) inset; }
.variation-card span { font-size:.82rem; font-weight:700; }
.variation-card canvas { width:100%; max-width:160px; height:auto; border-radius:8px; }
.top-summary { display:grid; grid-template-columns:340px 1fr; gap:20px; align-items:start; }
.cover-meta { display:grid; gap:12px; color:var(--muted); line-height:1.45; font-size:.94rem; }
.cover-meta h3 { margin:0; color:var(--text); font-size:1.1rem; }
.badge-line { display:flex; flex-wrap:wrap; gap:8px; }
.badge { border:1px solid var(--border); background:rgba(15,23,42,.65); color:#e5e7eb; border-radius:999px; padding:6px 9px; font-size:.8rem; font-weight:700; }
.checklist { margin:0; padding-left:18px; }
.checklist li { margin:7px 0; }
.asset-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(300px, 1fr)); gap:16px; }
.asset-card { border:1px solid var(--border); border-radius:18px; background:rgba(15,23,42,.45); padding:14px; display:grid; gap:12px; align-items:start; }
.asset-title { display:flex; justify-content:space-between; align-items:center; gap:8px; flex-wrap:wrap; }
.asset-title strong { font-size:.95rem; }
.asset-title span { color:var(--muted); font-size:.83rem; }
.canvas-wrap { overflow:auto; border-radius:12px; background:rgba(2,6,23,.5); padding:8px; border:1px solid rgba(255,255,255,.06); }
.canvas-main-wrap { width:max-content; max-width:100%; }
.compact-help { color:#94a3b8; font-size:.84rem; }
canvas { display:block; background:#111; border-radius:8px; box-shadow:0 24px 60px rgba(0,0,0,.35); }
#coverCanvas { width:320px; height:480px; }
#heroCanvas { width:848px; height:121px; max-width:100%; }
#bannerLargeCanvas { width:728px; height:90px; max-width:100%; }
#bannerMediumCanvas { width:300px; height:100px; }
#bannerSmallCanvas { width:300px; height:50px; }
.site-footer { padding:0 0 36px; }
.footer-inner { color:#94a3b8; font-size:.85rem; }
@media (max-width:1200px) { .variation-grid { grid-template-columns:repeat(2, minmax(0, 1fr)); } }
@media (max-width:1050px) { .app-layout { grid-template-columns:1fr; } .top-summary { grid-template-columns:1fr; } }
@media (max-width:760px) { .grid-2 { grid-template-columns:1fr; } .variation-grid { grid-template-columns:1fr 1fr; } }
@media (max-width:540px) { .shell { width:min(1440px, calc(100% - 20px)); } #coverCanvas { width:280px; height:420px; } .variation-grid { grid-template-columns:1fr; } .mode-switch { flex-direction:column; } }

@media (max-width:760px) { .debug-grid { grid-template-columns:1fr; } }


/* v0.92 beta polish */
@media (max-width: 900px) {
  .controls { padding: 14px; gap: 12px; }
  .btn-row button { flex: 1 1 calc(50% - 10px); }
  .asset-title { align-items: flex-start; }
  .asset-title button { margin-top: 4px; }
}

@media (max-width: 640px) {
  .shell { width: min(1440px, calc(100% - 16px)); }
  .card { border-radius: 16px; }
  .card-header { padding: 14px 14px 0; }
  .controls { padding: 14px; }
  .mode-switch { flex-direction: column; }
  .btn-row { flex-direction: column; }
  .btn-row button { width: 100%; flex: 1 1 auto; }
  .asset-title { display: grid; gap: 8px; }
  .asset-title button { width: max-content; max-width: 100%; }
  .preview-wrap { padding: 12px; }
  .debug-grid { grid-template-columns: 1fr; }
}

.preset-action button { width: 100%; }

.preset-panel { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.preset-info-card { border:1px solid var(--border); border-radius:16px; padding:12px; background:rgba(15,23,42,.38); }
.preset-info-card h3 { margin:0 0 6px; font-size:.92rem; }
.preset-description { color:var(--muted); font-size:.85rem; line-height:1.45; }
.recommended-presets { display:flex; flex-wrap:wrap; gap:8px; }
.preset-chip { border:1px solid rgba(56,189,248,.25); background:rgba(56,189,248,.08); color:#dbeafe; border-radius:999px; padding:8px 12px; font-size:.82rem; font-weight:700; cursor:pointer; }
.preset-chip:hover { filter:brightness(1.08); transform:translateY(-1px); }
.preset-chip.active { border-color:rgba(250,204,21,.45); background:rgba(250,204,21,.12); color:#fef3c7; }
.preset-meta { margin-top:4px; font-size:.76rem; color:#9fb3ca; }

@media (max-width:760px) { .preset-panel { grid-template-columns:1fr; } }