:root{
  --bg:#0a0f1c;--bg2:#0e1526;--panel:#101827;--panel2:#131d2f;--text:#f7f9ff;--muted:#9aa7bd;
  --line:rgba(255,255,255,.08);--accent:#5b8cff;--accent2:#7c4dff;--shadow:0 24px 70px rgba(0,0,0,.35);
}
html[data-theme="light"]{--bg:#f6f8fc;--bg2:#fff;--panel:#fff;--panel2:#f2f5fb;--text:#152033;--muted:#67758c;--line:rgba(10,30,60,.1);--shadow:0 20px 50px rgba(40,60,90,.12)}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);overflow:hidden}
button,textarea,select,input{font:inherit}.app-shell{height:100vh;display:grid;grid-template-columns:300px minmax(0,1fr) 340px;background:radial-gradient(circle at 60% 12%,rgba(76,98,255,.09),transparent 35%),var(--bg)}
.sidebar,.tools-panel{background:rgba(8,14,26,.82);backdrop-filter:blur(18px);border-color:var(--line)}html[data-theme="light"] .sidebar,html[data-theme="light"] .tools-panel{background:rgba(255,255,255,.86)}
.sidebar{border-right:1px solid var(--line);padding:18px 14px;display:flex;flex-direction:column;min-height:0}.brand-row{display:flex;align-items:center;gap:12px;padding:2px 8px 16px}.logo-mark{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;font-weight:900;font-size:24px;color:white;background:linear-gradient(135deg,#4e8cff,#7b3cff);box-shadow:0 10px 30px rgba(89,90,255,.28)}.brand-text{font-size:21px;font-weight:800;letter-spacing:-.3px}.brand-text span{color:#7f86ff}.sidebar-close{display:none;margin-left:auto}
.new-chat{border:0;border-radius:13px;padding:13px 16px;text-align:left;color:white;background:linear-gradient(135deg,var(--accent),#4f7eff 60%,var(--accent2));font-weight:750;cursor:pointer;box-shadow:0 8px 22px rgba(73,107,255,.24)}.new-chat span{font-size:20px;margin-right:6px}.primary-nav{display:grid;gap:5px;margin-top:14px}.nav-item{border:0;text-decoration:none;color:var(--muted);background:transparent;border-radius:11px;padding:11px 12px;display:flex;align-items:center;gap:11px;text-align:left;cursor:pointer}.nav-item:hover,.nav-item.active{background:var(--panel2);color:var(--text)}.nav-item span{width:23px;text-align:center}.history-header{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);padding:18px 12px 8px}.history-list{overflow:auto;display:grid;gap:3px}.history-item{border:0;background:transparent;color:var(--muted);text-align:left;padding:9px 12px;border-radius:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;cursor:pointer}.history-item:hover{background:var(--panel2);color:var(--text)}.sidebar-bottom{margin-top:auto;padding-top:12px}.plan-card{background:linear-gradient(180deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:14px;padding:12px}.plan-card strong,.plan-card small{display:block}.plan-card small{color:var(--muted);margin-top:3px}.upgrade-btn{display:block;text-align:center;margin-top:10px;border-radius:10px;padding:9px;text-decoration:none;color:white;background:linear-gradient(135deg,#4f7fff,#7c4dff);font-weight:700}
.main{display:flex;flex-direction:column;min-width:0;position:relative}.topbar{height:72px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;background:rgba(8,14,26,.38);backdrop-filter:blur(14px);z-index:4}html[data-theme="light"] .topbar{background:rgba(255,255,255,.45)}.menu-btn{display:none}.icon-btn{width:38px;height:38px;border:1px solid transparent;background:transparent;color:var(--text);border-radius:10px;cursor:pointer}.icon-btn:hover{background:var(--panel2)}.model-pill{display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:6px 11px}.model-dot{width:9px;height:9px;border-radius:50%;background:linear-gradient(135deg,#62d2ff,#7b4cff);box-shadow:0 0 14px #6b6cff}.model-pill select{color:var(--text);background:transparent;border:0;outline:0;font-weight:700}.top-actions{display:flex;align-items:center;gap:8px}.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;text-decoration:none;color:white;background:linear-gradient(135deg,#4e8cff,#6947ff);font-weight:700}
.workspace{flex:1;min-height:0;overflow:auto;position:relative}.welcome{min-height:100%;padding:70px 48px 180px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;position:relative}.hero-orb{position:absolute;width:650px;height:260px;top:20px;left:50%;transform:translateX(-50%);background:radial-gradient(ellipse,rgba(68,123,255,.18),transparent 60%);filter:blur(10px);pointer-events:none}.welcome h1{font-size:54px;line-height:1.04;margin:0;letter-spacing:-2px;position:relative}.welcome h1 span{background:linear-gradient(90deg,#57a6ff,#7b58ff);-webkit-background-clip:text;background-clip:text;color:transparent}.welcome>p{font-size:18px;color:var(--muted);margin:16px 0 34px}.quick-grid{width:min(820px,100%);display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.quick-card{min-height:128px;border:1px solid var(--line);background:linear-gradient(180deg,var(--panel2),var(--panel));border-radius:16px;color:var(--text);padding:18px;text-align:left;cursor:pointer;transition:.2s ease}.quick-card:hover{transform:translateY(-2px);border-color:rgba(100,128,255,.4);box-shadow:0 14px 35px rgba(0,0,0,.16)}.quick-card b,.quick-card span{display:block}.quick-card b{margin-bottom:10px}.quick-card span{color:var(--muted);font-size:14px;line-height:1.4}.messages{display:none;width:min(860px,calc(100% - 40px));margin:0 auto;padding:40px 0 190px}.messages.active{display:block}.message{display:flex;gap:13px;margin:0 0 26px}.message.user{justify-content:flex-end}.bubble{max-width:min(720px,88%);padding:14px 17px;border-radius:17px;line-height:1.58;white-space:pre-wrap;word-break:break-word}.message.user .bubble{background:linear-gradient(135deg,#315fda,#5d4be0);color:white;border-bottom-right-radius:6px}.message.assistant .bubble{background:var(--panel);border:1px solid var(--line);border-bottom-left-radius:6px}.message.error .bubble{border-color:rgba(255,90,90,.35)}.typing{display:inline-flex;gap:4px}.typing i{width:6px;height:6px;background:var(--muted);border-radius:50%;animation:bounce 1.2s infinite}.typing i:nth-child(2){animation-delay:.16s}.typing i:nth-child(3){animation-delay:.32s}@keyframes bounce{0%,80%,100%{transform:translateY(0);opacity:.45}40%{transform:translateY(-5px);opacity:1}}
.composer-wrap{position:absolute;left:0;right:0;bottom:0;padding:18px 24px 12px;background:linear-gradient(180deg,transparent,var(--bg) 25%);z-index:3}.composer{width:min(860px,100%);margin:auto;border:1px solid var(--line);background:rgba(17,25,42,.94);border-radius:18px;padding:13px 14px 11px;box-shadow:var(--shadow);backdrop-filter:blur(18px)}html[data-theme="light"] .composer{background:rgba(255,255,255,.96)}.composer textarea{width:100%;resize:none;border:0;outline:0;background:transparent;color:var(--text);font-size:16px;line-height:1.45;max-height:150px;min-height:30px}.composer textarea::placeholder{color:var(--muted)}.composer-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:7px}.composer-tools{display:flex;gap:6px;flex-wrap:wrap}.tool-btn{border:1px solid var(--line);background:var(--panel2);color:var(--text);border-radius:10px;padding:7px 10px;cursor:pointer}.tool-btn:hover{border-color:rgba(110,130,255,.4)}.send-btn{width:40px;height:40px;border:0;border-radius:50%;color:white;background:linear-gradient(135deg,#4e8cff,#7c4dff);cursor:pointer;font-size:18px}.send-btn:disabled{opacity:.45;cursor:not-allowed}.attachment-strip{display:flex;gap:6px;flex-wrap:wrap}.file-chip{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:8px;padding:5px 7px;margin-top:8px}.composer-note{text-align:center;color:var(--muted);font-size:11px;margin-top:8px}
.tools-panel{border-left:1px solid var(--line);padding:18px 14px;overflow:auto}.panel-block{border:1px solid var(--line);background:linear-gradient(180deg,var(--panel2),var(--panel));border-radius:15px;padding:14px;margin-bottom:12px}.panel-block h3{font-size:14px;margin:0 0 12px}.panel-model{display:flex;align-items:center;gap:10px;padding:11px;border:1px solid var(--line);border-radius:11px}.panel-model small{display:block;color:var(--muted);margin-top:2px}.spark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:rgba(108,81,255,.18);color:#a598ff}.panel-tool{width:100%;border:0;background:var(--bg2);color:var(--text);border-radius:10px;padding:11px 10px;margin:5px 0;display:grid;grid-template-columns:28px 1fr 16px;align-items:center;text-align:left;cursor:pointer}.panel-tool span{font-size:13px}.panel-tool b{color:var(--muted)}.usage-title{display:flex;justify-content:space-between;align-items:center}.usage-title span{font-size:12px;color:var(--muted)}.usage-bar{height:8px;border-radius:999px;background:var(--bg);overflow:hidden;margin:8px 0}.usage-bar i{display:block;width:0;height:100%;background:linear-gradient(90deg,#53b0ff,#765cff);border-radius:inherit}.usage-card small,.developer-card p{color:var(--muted);font-size:12px}.developer-card .crown{font-size:22px}.developer-card a{display:block;text-align:center;padding:9px;border-radius:10px;background:linear-gradient(135deg,#4f7fff,#7c4dff);color:white;text-decoration:none;font-weight:700;margin-top:10px}
@media(max-width:1180px){.app-shell{grid-template-columns:270px minmax(0,1fr)}.tools-panel{display:none}.quick-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){body{overflow:hidden}.app-shell{display:block}.sidebar{position:fixed;z-index:20;inset:0 auto 0 0;width:min(86vw,320px);transform:translateX(-102%);transition:.2s ease;box-shadow:30px 0 70px rgba(0,0,0,.4)}.sidebar.open{transform:none}.sidebar-close,.menu-btn{display:block}.topbar{padding:0 12px}.welcome{padding:48px 18px 175px}.welcome h1{font-size:38px}.welcome>p{font-size:15px}.quick-grid{grid-template-columns:1fr 1fr;gap:10px}.quick-card{min-height:105px;padding:14px}.composer-wrap{padding:14px 10px 8px}.tool-btn span{display:none}.messages{width:calc(100% - 24px);padding-top:28px}.model-pill select{max-width:155px}}
@media(max-width:480px){.quick-grid{grid-template-columns:1fr 1fr}.quick-card{font-size:14px}.welcome h1{font-size:33px}.topbar{height:62px}}