:root{--bg:#0f1720;--panel:#16212c;--panel2:#1c2937;--line:#2a3a4a;--ink:#e8eef4;--dim:#93a6b8;--brand:#2f9be0;--brand2:#1d6ea8;--ok:#37c281;--bad:#e0705f;--sel:#2f9be0}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-size:14px;overflow:hidden}
button{font:inherit;cursor:pointer}
.app{display:grid;grid-template-rows:48px 1fr;height:100vh}
/* top bar */
.top{display:flex;align-items:center;gap:10px;background:var(--panel);border-bottom:1px solid var(--line);padding:0 12px}
.top .brand{font-weight:800;color:var(--brand)}
.top .pname{background:transparent;border:1px solid transparent;color:var(--ink);font-weight:600;border-radius:6px;padding:4px 8px;max-width:220px}
.top .pname:hover,.top .pname:focus{border-color:var(--line);outline:none}
.top .sp{flex:1}
.tb{background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:6px 10px;font-size:13px}
.tb:hover{border-color:var(--brand)}
.tb.pri{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:700}
.tb.pri:hover{background:var(--brand2)}
.tb:disabled{opacity:.4;cursor:default}
.tb.on{background:var(--brand2);border-color:var(--brand)}
.dev{display:flex;gap:2px;background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:2px}
.dev button{background:transparent;border:none;color:var(--dim);border-radius:6px;padding:5px 9px}
.dev button.on{background:var(--brand);color:#fff}
.save{font-size:12px;color:var(--dim);min-width:96px;text-align:right}
.save.dirty{color:var(--bad)}.save.ok{color:var(--ok)}
/* body grid */
.mid{display:grid;grid-template-columns:220px 1fr 300px;height:100%;overflow:hidden}
.rail{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;overflow:hidden}
.rail.right{border-right:none;border-left:1px solid var(--line)}
.tabs{display:flex;border-bottom:1px solid var(--line)}
.tabs button{flex:1;background:transparent;border:none;color:var(--dim);padding:9px 4px;font-size:12px;font-weight:600;border-bottom:2px solid transparent}
.tabs button.on{color:var(--ink);border-bottom-color:var(--brand)}
.tabpane{flex:1;overflow:auto;padding:12px}
.tabpane[hidden]{display:none}
/* element palette */
.pal{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.pal button{background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:12px 6px;font-size:12px;display:flex;flex-direction:column;gap:5px;align-items:center}
.pal button:hover{border-color:var(--brand);color:var(--brand)}
.pal .ic{font-size:18px}
.hint{color:var(--dim);font-size:11px;margin:4px 0 12px}
/* canvas */
.canvaswrap{background:#0b1219;overflow:auto;display:flex;justify-content:center;padding:22px}
.frameholder{background:#fff;box-shadow:0 20px 60px -20px rgba(0,0,0,.7);transition:width .2s;width:100%;max-width:100%;align-self:flex-start}
.frameholder iframe{display:block;width:100%;height:calc(100vh - 48px - 44px);border:none;background:#fff}
/* inspector */
.grp{margin-bottom:16px}
.grp h4{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--dim);margin-bottom:8px}
.fld{margin-bottom:9px}
.fld label{display:block;font-size:11px;color:var(--dim);margin-bottom:3px}
.fld input,.fld select,.fld textarea{width:100%;background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:7px;padding:7px 9px;font:inherit;font-size:13px}
.fld input[type=color]{padding:2px;height:32px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.seg{display:flex;gap:3px}.seg button{flex:1;background:var(--panel2);border:1px solid var(--line);color:var(--dim);border-radius:6px;padding:6px;font-size:12px}
.seg button.on{background:var(--brand);color:#fff;border-color:var(--brand)}
.selnone{color:var(--dim);font-size:13px;text-align:center;padding:24px 0}
.badgetag{display:inline-block;background:var(--brand2);color:#fff;font-size:11px;border-radius:5px;padding:2px 7px;font-family:ui-monospace,monospace}
/* layers */
.layers .ly{display:flex;align-items:center;gap:6px;padding:4px 6px;border-radius:6px;cursor:pointer;font-size:12px;color:var(--ink);white-space:nowrap;overflow:hidden}
.layers .ly:hover{background:var(--panel2)}
.layers .ly.sel{background:var(--brand2);color:#fff}
.layers .ly .t{overflow:hidden;text-overflow:ellipsis}
.layers .ly .mut{color:var(--dim);font-size:10px}
/* floating toolbar (in parent, positioned over iframe) */
.fbar{position:fixed;z-index:60;display:none;gap:2px;background:var(--panel);border:1px solid var(--brand);border-radius:8px;padding:3px;box-shadow:0 8px 24px rgba(0,0,0,.5)}
.fbar button{background:transparent;border:none;color:var(--ink);border-radius:5px;padding:5px 7px;font-size:12px}
.fbar button:hover{background:var(--brand2)}
/* code / modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:none;align-items:center;justify-content:center;z-index:80;padding:20px}
.modal.on{display:flex}
.modal .box{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px;max-width:720px;width:100%;max-height:86vh;overflow:auto}
.modal h3{margin-bottom:10px}
.modal textarea{width:100%;min-height:280px;background:#0b1219;border:1px solid var(--line);color:#cfe6dd;border-radius:8px;padding:12px;font-family:ui-monospace,monospace;font-size:12px}
.modal .row{display:flex;gap:10px;justify-content:flex-end;margin-top:12px}
.diff{background:#0b1219;border:1px solid var(--line);border-radius:8px;padding:12px;max-height:300px;overflow:auto;font-size:12px;color:var(--dim)}
/* AI bar */
.ai{position:fixed;left:50%;transform:translateX(-50%);bottom:16px;z-index:70;background:var(--panel);border:1px solid var(--brand);border-radius:12px;padding:8px;display:flex;gap:8px;align-items:center;box-shadow:0 10px 30px rgba(0,0,0,.5);width:min(620px,92vw)}
.ai input{flex:1;background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:9px 11px;font:inherit}
.ai .scope{background:var(--panel2);border:1px solid var(--line);color:var(--dim);border-radius:8px;padding:9px}
.toast{position:fixed;bottom:74px;left:50%;transform:translateX(-50%);background:var(--panel2);border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:9px 14px;z-index:90;display:none;font-size:13px}
.toast.on{display:block}
.previewing .rail,.previewing .fbar,.previewing .ai{display:none!important}
.previewing .mid{grid-template-columns:1fr}