:root{--page:#f9f9f7;--surface:#fcfcfb;--ink:#0b0b0b;--ink2:#52514e;--muted:#898781;
  --grid:#e1e0d9;--hair:rgba(11,11,11,.10);--hair2:rgba(11,11,11,.06);
  --accent:#2a78d6;--accent-d:#1c5cab;--accent-t:rgba(42,120,214,.08);
  --good:#0ca30c;--crit:#d03b3b;--warn:#eda100;--violet:#4a3aa7;
  --r:12px;--mono:ui-monospace,'Consolas',monospace;
  --shadow:0 1px 2px rgba(11,11,11,.05),0 1px 3px rgba(11,11,11,.04)}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--page);color:var(--ink);font-family:system-ui,-apple-system,'Segoe UI',sans-serif;
  height:100vh;display:flex;flex-direction:column;overflow:hidden;font-size:14px;user-select:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
svg{display:block}
/* topbar */
#topbar{display:flex;align-items:center;gap:16px;padding:0 22px;height:56px;flex:none;
  background:var(--surface);border-bottom:1px solid var(--hair)}
#logo{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15.5px;color:inherit;text-decoration:none}
#logo .mark{width:26px;height:26px;border-radius:7px;background:var(--accent);display:grid;place-items:center}
#logo em{font-style:normal;color:var(--accent)}
#logo .lv{color:#0e7a54;background:rgba(27,175,122,.12);font-size:12px;font-weight:700;
  padding:3px 10px;border-radius:12px}
.tb-link{color:var(--ink2);font-size:13px;font-weight:500;padding:7px 11px;border-radius:8px;text-decoration:none}
.tb-link:hover{background:var(--accent-t);color:var(--accent-d)}
#run-controls{margin-left:auto;display:flex;gap:8px;align-items:center}
#btnrun{background:var(--good);color:#fff;font-weight:700;font-size:14px;padding:9px 22px;
  border-radius:10px;display:flex;gap:8px;align-items:center}
#btnrun:hover{filter:brightness(1.08)}
#btnstop{background:var(--surface);color:var(--crit);border:1.5px solid var(--hair);
  font-weight:600;padding:9px 16px;border-radius:10px}
#btnstop:hover{border-color:var(--crit)}
#speed{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:12px}
/* layout */
#main{flex:1;display:grid;grid-template-columns:280px 1fr 1.15fr;gap:12px;padding:12px;min-height:0}
.col{background:var(--surface);border:1px solid var(--hair);border-radius:var(--r);
  display:flex;flex-direction:column;overflow:hidden;box-shadow:var(--shadow)}
.col .hd{padding:11px 15px;border-bottom:1px solid var(--hair2);font-weight:700;font-size:11.5px;
  color:var(--ink2);letter-spacing:.06em;text-transform:uppercase;display:flex;align-items:center;gap:8px}
.col .bd{flex:1;overflow:auto;padding:12px;min-height:0}
/* module palette */
.mp-cap{font-size:11.5px;color:var(--muted);margin-bottom:8px;line-height:1.5}
.mp-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:16px}
.mp-item{border:1.5px solid var(--hair);border-radius:10px;padding:8px 6px 6px;text-align:center;
  cursor:grab;background:var(--surface);transition:border-color .15s}
.mp-item:hover{border-color:var(--accent)}
.mp-item.used{opacity:.35;pointer-events:none}
.mp-item svg{width:54px;height:40px;margin:0 auto 4px}
.mp-item b{font-size:11px;font-weight:650;display:block;line-height:1.3}
.mp-item span{font-size:9.5px;color:var(--muted)}
/* block palette */
.bp-grp{margin-bottom:4px}
.blocks-wrap{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}
.blk{border-radius:9px;padding:8px 12px;font-size:12.5px;font-weight:650;color:#fff;
  cursor:grab;display:inline-flex;gap:7px;align-items:center;line-height:1.3;
  box-shadow:0 1px 2px rgba(11,11,11,.15);touch-action:none}
.blk:active{cursor:grabbing}
.blk .bico{width:13px;height:13px;flex:none}
.b-act{background:#2a78d6}.b-off{background:#6d6b66}.b-wait{background:#b57d00}
.b-loop{background:#4a3aa7}.b-if{background:#0e7a54}.b-servo{background:#8a4bb8}
.blk small{font-weight:500;opacity:.85}
.blk input{width:36px;border:none;border-radius:5px;font-family:inherit;font-weight:700;
  font-size:12px;text-align:center;padding:2px;color:var(--ink)}
/* program area */
#prog{min-height:100%;padding-bottom:60px}
#prog.empty::after{content:"Kéo khối lệnh từ bên trái thả vào đây";display:block;color:var(--muted);
  font-size:12.5px;border:2px dashed var(--grid);border-radius:12px;padding:26px;text-align:center;margin-top:6px}
.pstep{margin-bottom:6px;position:relative}
.pstep>.blk{display:flex;cursor:grab;width:100%}
.pstep .del{margin-left:auto;opacity:.55;font-size:13px;padding:0 2px}
.pstep .del:hover{opacity:1}
.pstep.exec>.blk{outline:3px solid #ffd24a;outline-offset:1.5px}
.pcontainer{border-radius:10px;padding:5px 5px 5px 10px;margin-top:3px;
  border-left:4px solid;min-height:34px}
.pc-loop{background:rgba(74,58,167,.07);border-color:#4a3aa7}
.pc-if{background:rgba(14,122,84,.07);border-color:#0e7a54}
.pcontainer.empty::after{content:"thả khối vào đây";color:var(--muted);font-size:11px;
  display:block;padding:6px;text-align:center;border:1.5px dashed var(--grid);border-radius:8px}
#dropline{height:4px;background:var(--accent);border-radius:2px;margin:2px 0;box-shadow:0 0 6px rgba(42,120,214,.6)}
.blocklyToolboxDiv{background:var(--page)!important;border-right:1px solid var(--hair2)}
#ghost{position:fixed;pointer-events:none;z-index:200;opacity:.92;transform:rotate(2deg);display:none}
/* stage */
#stagebox{flex:1;min-height:0;display:grid;place-items:center;padding:8px;
  background:#eef0ea;margin:12px;border-radius:10px;border:1px solid var(--hair2);position:relative}
#stage{width:100%;height:100%}
#stagehint{position:absolute;top:12px;left:14px;font-size:11.5px;color:var(--muted);
  background:var(--surface);padding:5px 12px;border-radius:14px;border:1px solid var(--hair)}
/* cable current animation */
.cable{fill:none;stroke:#52514e;stroke-width:4;stroke-linecap:round}
.cflow{fill:none;stroke-width:2.6;stroke-linecap:round;stroke-dasharray:5 11;opacity:0;
  transition:opacity .25s}
.cflow.on{opacity:1;animation:flow .5s linear infinite}
.cflow.rev{animation-direction:reverse}
@keyframes flow{to{stroke-dashoffset:-16}}
.fanspin{animation:spin 1s linear infinite;transform-box:fill-box;transform-origin:center}
@keyframes spin{to{transform:rotate(360deg)}}
.pulse-glow{filter:drop-shadow(0 0 8px currentColor)}
#console{height:92px;flex:none;border-top:1px solid var(--hair2);font-family:var(--mono);
  font-size:11.5px;padding:8px 14px;overflow:auto;color:var(--ink2)}
#console .ok{color:#006300}#console .info{color:var(--accent-d)}#console .err{color:var(--crit)}
@media(max-width:1100px){#main{grid-template-columns:1fr;overflow:auto}}