:root{
  --bg:#f3f5f9;
  --panel:#ffffff;
  --line:#e6e9f2;
  --text:#1f2937;
  --muted:#6b7280;
  --primary:#5b6cff;
  --danger:#d94848;
  --shadow:0 10px 30px rgba(16,24,40,.06);
  --radius:14px;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}
.app-shell{
  display:grid;
  grid-template-columns:320px 1fr 320px;
  min-height:100vh;
}
.sidebar,.inspector{
  background:var(--panel);
  border-right:1px solid var(--line);
  padding:18px;
  overflow:auto;
}
.inspector{border-right:none;border-left:1px solid var(--line);}
.workspace{display:flex;flex-direction:column;min-width:0;}
.brand{display:flex;gap:12px;align-items:center;margin-bottom:14px;}
.brand-dot{width:14px;height:14px;border-radius:999px;background:linear-gradient(135deg,var(--primary),#8ea2ff);}
.brand h1{font-size:18px;margin:0;}
.brand p{margin:2px 0 0;color:var(--muted);font-size:12px;}
.panel{
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:12px;
  margin-bottom:12px;
  background:#fff;
}
.panel h2{
  margin:0 0 10px;
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
}
label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px;margin-top:8px;}
input,textarea,select,button{
  width:100%;
  border:1px solid var(--line);
  background:#fff;
  border-radius:10px;
  padding:10px;
  font-size:14px;
  color:var(--text);
}
textarea{min-height:72px;resize:vertical}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.inline{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px;}
.actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.btn{cursor:pointer;transition:.18s ease;}
.btn:hover{transform:translateY(-1px);}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff;}
.btn.danger{background:#fff5f5;border-color:#ffd6d6;color:var(--danger);}
.btn.ghost{background:#fff;}

.topbar{
  display:flex;justify-content:space-between;align-items:center;
  padding:12px 16px;border-bottom:1px solid var(--line);background:#fff;
}
.left-tools,.device-switch{display:flex;gap:8px;}
.device-switch .btn{width:auto;padding:8px 14px;}
.device-switch .active{background:var(--primary);color:#fff;border-color:var(--primary);}

.canvas-wrap{padding:18px;overflow:auto;}
.frame{
  margin:0 auto;
  width:min(1100px,100%);
  min-height:760px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  box-shadow:var(--shadow);
  overflow:hidden;
  transition:width .2s ease;
}
.frame.tablet{width:820px;}
.frame.mobile{width:390px;}

.site-header,.site-footer{padding:20px;color:#fff;}
.site-main{padding:24px;}

.block{
  border:1px solid #e5e7eb;
  border-radius:12px;
  margin-bottom:12px;
  background:#fff;
  position:relative;
}
.block.selected{outline:2px solid var(--primary);}
.block.hidden{opacity:.45}
.block.locked::after{
  content:"LOCKED";
  position:absolute;top:8px;left:8px;
  font-size:10px;padding:2px 6px;border-radius:8px;
  background:#111827;color:#fff;
}
.block-toolbar{
  position:absolute;top:8px;right:8px;display:flex;gap:4px;
}
.block-toolbar button{
  width:auto;padding:4px 8px;font-size:12px;border-radius:8px;background:#fff;
}
.hr{border:none;border-top:1px solid #e5e7eb;margin:0;}
@media (max-width: 1280px){
  .app-shell{grid-template-columns:300px 1fr;}
  .inspector{display:none;}
}