:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --text:#111111;
  --muted:#555555;
  --border:#e6e8f0;

  --accent:#1f4fff;
  --accentText:#ffffff;

  --shadow:0 1px 2px rgba(0,0,0,.05);
  --radius:12px;
}

:root[data-theme="dark"]{
  --bg:#0b1020;
  --card:#111a2e;
  --text:#e7ecff;
  --muted:#a8b2d6;
  --border:#243156;
  --shadow:0 1px 2px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
body{font-family:system-ui,Arial,sans-serif;margin:0;background:var(--bg);color:var(--text)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.container{max-width:980px;margin:18px auto;padding:0 14px}

h1{font-size:20px;margin:0 0 10px}
h2{font-size:16px;margin:0 0 10px}
h3{font-size:15px;margin:14px 0 8px}
h4{font-size:14px;margin:12px 0 6px}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin:12px 0;box-shadow:var(--shadow)}
.sub{color:var(--muted);font-size:13px;margin:6px 0 0}
.hint{font-size:12px;color:var(--muted);margin-top:6px}
.msg{margin-top:10px;color:#d12c2c;font-size:13px}

.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
label{display:flex;flex-direction:column;font-size:13px;gap:6px}

input,select{
  padding:10px;border:1px solid var(--border);border-radius:10px;font-size:14px;
  background:transparent;color:var(--text)
}
input::placeholder{color:var(--muted)}

button{
  padding:10px 14px;border:1px solid transparent;border-radius:10px;
  background:var(--accent);color:var(--accentText);font-weight:650;cursor:pointer
}
button.secondary{background:transparent;border-color:var(--border);color:var(--text)}
button:disabled{opacity:.6;cursor:not-allowed}

.check{grid-column:1/-1;display:flex;flex-direction:row;align-items:center;gap:8px;font-size:13px}

.toolbar{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;flex-wrap:wrap}
.badge{font-size:12px;padding:6px 10px;border:1px solid var(--border);border-radius:999px;color:var(--muted);background:transparent}
.chips{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.chip{padding:8px 10px;border-radius:999px;border:1px solid var(--border);background:transparent;color:var(--text);font-weight:600}
.chip.active{border-color:var(--accent);box-shadow:0 0 0 2px rgba(31,79,255,.12)}
.color-dot{width:18px;height:18px;border-radius:999px;border:1px solid var(--border);display:inline-block;vertical-align:middle;margin-right:6px}

.nav{margin:10px 0;font-size:14px;color:var(--muted)}

.tabs{display:flex;gap:10px;margin:12px 0;flex-wrap:wrap}
.tabbtn{background:transparent;color:var(--text);border:1px solid var(--border)}
.tabbtn.active{background:var(--accent);color:var(--accentText);border-color:var(--accent)}

.framewrap{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--card)}
.frame{width:100%;height:78vh;border:0;display:none}
.frame.active{display:block}

.chatlog{border:1px solid var(--border);border-radius:10px;padding:10px;height:260px;overflow:auto;background:rgba(0,0,0,.02)}
:root[data-theme="dark"] .chatlog{background:rgba(255,255,255,.03)}
.bubble{padding:8px 10px;border-radius:12px;margin:6px 0;max-width:92%}
.user{background:rgba(31,79,255,.18);margin-left:auto}
.bot{background:rgba(0,0,0,.05)}
:root[data-theme="dark"] .bot{background:rgba(255,255,255,.06)}
.chatinput{display:flex;gap:8px;margin-top:10px}
.chatinput input{flex:1}

.canvas-wrap{border:1px solid var(--border);border-radius:12px;padding:10px;background:transparent}
canvas{width:100%;height:260px;display:block}

@media (max-width: 760px){
  .container{margin:12px auto}
  .grid{grid-template-columns:1fr}
  .frame{height:74vh}
  .chatlog{height:230px}
  canvas{height:220px}
}