:root{
  --idm-blue:#1e4ea1; --idm-red:#e53935;
  --bg:#0b1220; --panel:#0f172a; --card:#131e36; --text:#e8ecf6; --muted:#9fb0d0;
  --accent:var(--idm-red); --accent2:var(--idm-blue);
  --user:#11284e; --bot:#0e1a31; --border:#1f2c48;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,Segoe UI,Roboto,Arial}

/* Nav */
.nav{position:sticky;top:0;z-index:20;background:linear-gradient(90deg,var(--idm-blue),#163b77);border-bottom:1px solid #0a1330;padding:10px 14px;display:flex;align-items:center;justify-content:space-between}
.nav .brand{display:flex;gap:12px;align-items:center}
.logo{height:28px}
.titles h1{margin:0;font-size:18px;letter-spacing:.5px}
.titles .subtitle{margin:0;color:#d0ddff;font-size:12px;opacity:.9}
.btn{background:var(--accent);color:#fff;border:none;border-radius:10px;padding:10px 14px;cursor:pointer}
.btn.ghost{background:transparent;border:1px solid rgba(255,255,255,.25)}
.btn.active{border-color:var(--accent);box-shadow:0 0 0 2px rgba(229,57,53,.25)}

/* Layout */
.container{max-width:980px;margin:0 auto;padding:14px;display:flex;flex-direction:column;min-height:calc(100vh - 64px)}
.hero{background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,0));text-align:center;padding:18px 10px;margin:6px 0 2px;border-radius:14px}
.hero h2{margin:2px 0 6px 0;font-size:28px}
.hero p{margin:0 0 12px 0;color:#c9d6f9}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}
.card{background:#0b172d;border:1px solid var(--border);color:#d6e4ff;padding:14px;border-radius:12px;text-align:left;cursor:pointer}
.card:hover{border-color:var(--accent2)}

.quick-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.tab{background:#0b162c;border:1px solid var(--border);color:#d6e4ff;padding:8px 12px;border-radius:999px;cursor:pointer}
.tab.active,.tab:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px rgba(229,57,53,.25)}

.chips{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 10px}
.chip{background:#0c162b;border:1px solid #2a3a61;color:#d6e4ff;padding:8px 10px;border-radius:999px;cursor:pointer}
.chip:hover{border-color:var(--accent2)}

.status{background:#0e1a33;border:1px dashed var(--border);padding:8px 10px;border-radius:10px;margin:10px 0;color:var(--muted)}

/* Chat list like ChatGPT */
.chat{flex:1;overflow:auto;display:flex;flex-direction:column;gap:14px;padding:10px 0 120px}
.msg{display:flex;gap:12px;padding:0 4px}
.msg .avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-size:18px}
.msg.user .avatar{background:rgba(79,140,255,.15);border:1px solid #2a4477}
.msg.bot .avatar{background:rgba(229,57,53,.12);border:1px solid #5a2630}
.bubble{padding:12px 14px;border-radius:14px;max-width:820px;white-space:pre-wrap}
.msg.user .bubble{background:var(--user)}
.msg.bot .bubble{background:var(--bot)}
.controls{display:flex;gap:6px;margin-top:6px}
.icon{background:transparent;border:1px solid var(--border);color:#cfe4ff;border-radius:8px;padding:6px 8px;cursor:pointer}

/* Typing */
.typing{display:flex;align-items:center;gap:8px;margin:0 4px}
.typing .dot{width:6px;height:6px;border-radius:50%;background:#a6c1ff;opacity:.6;animation:blink 1.2s infinite}
.typing .dot:nth-child(2){animation-delay:.2s}.typing .dot:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.2}40%{opacity:.9}}

/* Composer like ChatGPT */
.composer{position:sticky;bottom:0;background:linear-gradient(180deg,rgba(11,18,32,.0),rgba(11,18,32,1) 40%);padding:12px 0 14px;backdrop-filter:saturate(1.1)}
.input-wrap{position:relative;display:flex;align-items:center;gap:8px}
.input{flex:1;background:#0f1a2a;border:1px solid var(--border);color:#fff;padding:12px 46px 12px 12px;border-radius:14px;resize:none;max-height:160px;overflow:auto}
.mic{position:absolute;right:8px;top:6px;background:var(--accent2);border-radius:10px;padding:8px 10px}
.send{margin-left:8px;background:var(--accent)}

.foot{max-width:980px;margin:8px auto 18px; color:#a8b8db; text-align:center}

@media (max-width:640px){ .logo{height:22px} .bubble{max-width:100%} }