:root {
  --bg:#000; --fg:#eee; --muted:#9aa4b2;
  --blue1:#2563eb; --blue2:#06b6d4; --accent:#3b82f6;
  --card:#0b0b0f; --border:#1f2937; --shadow:0 8px 24px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Noto Sans JP",sans-serif}
.app-header{background:linear-gradient(90deg,var(--blue1),var(--blue2));color:#fff;padding:16px 12px;text-align:center;box-shadow:var(--shadow)}
.app-header h1{margin:4px 0 0;font-size:20px}
.app-header p{margin:4px 0 0;opacity:.9}
.app-main{max-width:1000px;margin:0 auto;padding:16px}
.uploader{display:flex;flex-direction:column;align-items:center;gap:8px;margin:8px 0 16px}
.hint{color:var(--muted);font-size:14px}.hint.small{font-size:12px;opacity:.9}
.workspace{display:flex;justify-content:center;align-items:center;margin:8px 0 16px}
canvas{background:#111;border:2px dashed #333;border-radius:16px;max-width:95vw;height:auto}
.controls .row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:center}
.control{display:flex;align-items:center;gap:8px}
label.switch{display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.frames{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:12px;margin-top:8px}
.frames h2{margin:0 0 8px}
.frame-list{display:flex;flex-wrap:wrap;gap:8px}
.frame-add{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px}
.frame-btn{border:2px solid transparent;border-radius:12px;padding:4px;background:#0f1218;cursor:pointer;transition:.2s}
.frame-btn:hover,.frame-btn.active{border-color:var(--accent);box-shadow:0 0 0 2px rgba(59,130,246,.25)}
.frame-btn img{width:84px;height:84px;object-fit:cover;border-radius:10px;display:block}
.generator{margin-top:12px;background:#0b0f16;border:1px solid var(--border);border-radius:12px;padding:10px}
.gen-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-bottom:8px}
.gen-grid label{display:flex;flex-direction:column;gap:4px;font-size:14px}
.presets .chip{border:1px solid var(--border);background:#0f1218;color:#fff;border-radius:999px;padding:6px 10px;cursor:pointer}
.presets .chip:hover{border-color:var(--accent)}
.chip-label{color:#9aa4b2;margin-right:8px}
.history{margin-top:16px}
.history-list{display:flex;gap:10px;flex-wrap:wrap}
.history-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:8px;max-width:160px}
.history-card img{width:144px;height:144px;border-radius:10px;display:block}
.history-card .row{display:flex;justify-content:space-between;align-items:center;margin-top:6px}
.history-card button{font-size:12px}
.btn{display:inline-flex;align-items:center;gap:8px;border:none;border-radius:10px;padding:10px 14px;cursor:pointer;font-weight:600}
.btn.primary{background:linear-gradient(90deg,var(--blue1),var(--blue2));color:#fff;box-shadow:0 0 0 0 rgba(59,130,246,.6);transition:box-shadow .2s}
.btn.primary:hover{box-shadow:0 0 24px 2px rgba(59,130,246,.35)}
.btn.ghost{background:transparent;border:1px solid var(--border);color:var(--fg)}
.btn.ghost:hover{border-color:var(--accent)}
.fab-bar{position:fixed;left:0;right:0;bottom:12px;display:flex;gap:10px;justify-content:center;pointer-events:none}
.fab{pointer-events:auto;border:none;border-radius:999px;padding:12px 18px;font-weight:700}
.fab.primary{background:linear-gradient(90deg,var(--blue1),var(--blue2));color:#fff}
.fab.ghost{background:#0b0f16;color:#ddd;border:1px solid var(--border)}
dialog{background:#0b0b10;color:var(--fg);border:1px solid var(--border);border-radius:12px;padding:16px;max-width:520px;width:92vw}
dialog::backdrop{background:rgba(0,0,0,.5)}
.share-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:8px}
.share-btn{background:#0f1218;border:1px solid var(--border);color:#fff;border-radius:10px;padding:10px;cursor:pointer}
.qr{text-align:center;background:#0f1218;border:1px dashed #2a3342;border-radius:10px;padding:10px;grid-column:1/3}
.qr img{width:180px;height:180px;object-fit:contain;background:#fff;border-radius:6px}
.qr-caption{font-size:12px;color:#9aa4b2;margin-top:6px}
.app-footer{color:#9aa4b2;text-align:center;padding:24px 12px}
@media (max-width:768px){
  .controls .row{gap:10px}
  .frame-btn img{width:72px;height:72px}
  .history-card img{width:120px;height:120px}
  .gen-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}