:root{
  --bg:#0b0e14; --panel:#121722; --panel2:#171d2b; --line:#232b3b;
  --txt:#e7ecf3; --mut:#93a0b4; --acc:#ff6a00; --acc2:#ffa64d;
  --ok:#31c48d; --err:#f0616d; --code:#0d1117;
  --r:14px; --sb:380px;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--txt);font:14px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;}
a{color:var(--acc2)}
button{font-family:inherit}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:#2a3346;border-radius:8px}

/* ---------- top bar ---------- */
.top{display:flex;align-items:center;gap:14px;padding:10px 18px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#141a26,#10141d);position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.2px}
.logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--acc),var(--acc2));display:grid;place-items:center;font-size:15px;color:#1a1206;font-weight:900}
.brand small{display:block;font-weight:500;color:var(--mut);font-size:11px;letter-spacing:.4px}
.spacer{flex:1}
.sel,.pill{background:var(--panel2);border:1px solid var(--line);color:var(--txt);border-radius:10px;padding:7px 11px;font-size:13px}
.sel{cursor:pointer}
.pill{display:flex;align-items:center;gap:7px;color:var(--mut)}
.dot{width:8px;height:8px;border-radius:50%;background:#4a5568}
.dot.on{background:var(--ok);box-shadow:0 0 0 3px rgba(49,196,141,.18)}
.dot.warn{background:var(--acc);box-shadow:0 0 0 3px rgba(255,106,0,.18)}
.ghost{background:transparent;border:1px solid var(--line);color:var(--mut);border-radius:10px;padding:7px 11px;cursor:pointer}
.ghost:hover{color:var(--txt);border-color:#33405a}

/* ---------- layout ---------- */
.wrap{display:grid;grid-template-columns:1fr var(--sb);height:calc(100% - 53px)}
.main{display:flex;flex-direction:column;min-width:0}
.chat{flex:1;overflow-y:auto;padding:22px 26px 8px}
.side{border-left:1px solid var(--line);background:var(--panel);display:flex;flex-direction:column;min-height:0}
.side h3{margin:0;padding:13px 16px;font-size:12px;letter-spacing:.7px;text-transform:uppercase;color:var(--mut);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:8px}
.side .sec{overflow-y:auto;padding:12px 14px}
#activity{flex:1;min-height:0}
#arts{max-height:38%;border-top:1px solid var(--line)}

/* ---------- hero / empty ---------- */
.hero{max-width:820px;margin:6vh auto 0;text-align:center;padding:0 20px}
.hero h1{font-size:30px;margin:0 0 8px;background:linear-gradient(90deg,#fff,#ffd0a8);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--mut);margin:0 0 26px;font-size:15px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:18px;text-align:left;cursor:pointer;transition:.16s}
.card:hover{border-color:var(--acc);transform:translateY(-2px)}
.card .ic{font-size:22px}
.card b{display:block;margin:9px 0 5px;font-size:15px}
.card span{color:var(--mut);font-size:12.5px}
.examples{max-width:820px;margin:22px auto 0;display:flex;flex-wrap:wrap;gap:9px;justify-content:center}
.ex{background:var(--panel2);border:1px solid var(--line);color:var(--mut);border-radius:999px;padding:8px 14px;font-size:12.5px;cursor:pointer}
.ex:hover{color:var(--txt);border-color:#3a4763}

/* ---------- messages ---------- */
.msg{max-width:820px;margin:0 auto 20px;display:flex;gap:12px}
.av{width:30px;height:30px;border-radius:9px;flex:0 0 30px;display:grid;place-items:center;font-size:13px;font-weight:700}
.av.u{background:#26314a;color:#cdd8ee}
.av.a{background:linear-gradient(135deg,var(--acc),var(--acc2));color:#1a1206}
.bubble{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 15px;min-width:0;flex:1}
.msg.user .bubble{background:var(--panel2)}
.bubble pre{background:var(--code);border:1px solid var(--line);border-radius:9px;padding:11px;overflow-x:auto;font-size:12.5px;margin:9px 0}
.bubble code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.bubble p{margin:7px 0}
.bubble h1,.bubble h2,.bubble h3{margin:12px 0 6px}
.bubble table{border-collapse:collapse;margin:8px 0}
.bubble td,.bubble th{border:1px solid var(--line);padding:5px 9px}
.bubble ul,.bubble ol{padding-left:20px;margin:7px 0}
.toolchip{display:inline-flex;align-items:center;gap:7px;background:#0f1626;border:1px solid var(--line);border-radius:8px;padding:5px 10px;margin:8px 0;font-size:12px;color:var(--mut)}
.toolchip b{color:var(--acc2)}
.spin{width:12px;height:12px;border:2px solid #33405a;border-top-color:var(--acc);border-radius:50%;animation:sp .7s linear infinite;display:inline-block}
@keyframes sp{to{transform:rotate(360deg)}}
.cursor:after{content:"▋";color:var(--acc);animation:bl 1s steps(2) infinite}
@keyframes bl{50%{opacity:0}}

/* ---------- activity ---------- */
.ev{border:1px solid var(--line);border-radius:10px;margin-bottom:10px;overflow:hidden;background:var(--panel2)}
.ev .h{padding:7px 11px;font-size:11.5px;color:var(--mut);display:flex;justify-content:space-between;gap:8px;background:#0f1420}
.ev pre{margin:0;padding:9px 11px;background:var(--code);font-size:11.5px;max-height:190px;overflow:auto;white-space:pre-wrap;word-break:break-word}
.ev .out{color:#b9c6da}.ev .err{color:#f0a0a8}
.badge{font-size:10px;padding:1px 7px;border-radius:6px;background:#1d2740;color:var(--mut)}
.badge.ok{background:rgba(49,196,141,.15);color:var(--ok)}
.badge.bad{background:rgba(240,97,109,.15);color:var(--err)}

/* ---------- artifacts ---------- */
.art{display:flex;align-items:center;gap:10px;padding:9px 11px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:var(--panel2)}
.art .fi{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-size:11px;font-weight:700;background:#233150;color:#cfe0ff;flex:0 0 30px}
.art .meta{min-width:0;flex:1}
.art .meta b{display:block;font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.art .meta span{color:var(--mut);font-size:11px}
.dl{background:var(--acc);color:#1a1206;border:0;border-radius:8px;padding:6px 11px;font-weight:700;cursor:pointer;font-size:12px;text-decoration:none}

/* ---------- composer ---------- */
.composer{border-top:1px solid var(--line);padding:12px 26px 16px;background:var(--panel)}
.cbox{max-width:820px;margin:0 auto;display:flex;gap:9px;align-items:flex-end;background:var(--panel2);border:1px solid var(--line);border-radius:14px;padding:9px 10px}
.cbox:focus-within{border-color:#3a4763}
textarea{flex:1;background:transparent;border:0;color:var(--txt);resize:none;font:14px/1.5 inherit;max-height:180px;outline:none;padding:6px}
.iconbtn{background:transparent;border:0;color:var(--mut);cursor:pointer;font-size:18px;padding:6px 8px;border-radius:8px}
.iconbtn:hover{color:var(--txt);background:#1c2436}
.send{background:linear-gradient(135deg,var(--acc),var(--acc2));color:#1a1206;border:0;border-radius:10px;padding:9px 16px;font-weight:800;cursor:pointer}
.send:disabled{opacity:.45;cursor:not-allowed}
.hint{max-width:820px;margin:7px auto 0;color:#5f6b7e;font-size:11px;text-align:center}
.uploads{max-width:820px;margin:0 auto 8px;display:flex;gap:8px;flex-wrap:wrap}
.up{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:5px 10px;font-size:12px;color:var(--mut);display:flex;gap:8px;align-items:center}
.up b{color:var(--txt)} .up button{background:0;border:0;color:var(--err);cursor:pointer}

/* ---------- passcode overlay ---------- */
.gate{position:fixed;inset:0;background:radial-gradient(1200px 600px at 50% -10%,#1b2437,#080b11);display:grid;place-items:center;z-index:50;padding:20px}
.gcard{width:100%;max-width:390px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:30px}
.gcard .logo{width:46px;height:46px;font-size:22px;margin-bottom:14px}
.gcard h2{margin:0 0 6px;font-size:20px}
.gcard p{color:var(--mut);margin:0 0 20px;font-size:13px}
.gcard input{width:100%;background:var(--panel2);border:1px solid var(--line);border-radius:11px;padding:13px 14px;color:var(--txt);font:15px/1 inherit;outline:none;letter-spacing:.5px}
.gcard input:focus{border-color:var(--acc)}
.gcard .send{width:100%;margin-top:14px;padding:13px}
.gerr{color:var(--err);font-size:12.5px;margin-top:11px;min-height:16px}
.gfoot{color:#5f6b7e;font-size:11.5px;margin-top:18px;text-align:center;line-height:1.6}
.hide{display:none!important}
@media(max-width:900px){.wrap{grid-template-columns:1fr}.side{display:none}.cards{grid-template-columns:1fr}}