@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root{--bg:#07090d;--panel:#0d1118;--panel2:#111722;--line:#202836;--text:#f4f7fb;--muted:#8f9aaa;--accent:#8b5cf6;--accent2:#06b6d4;--good:#22c55e;--danger:#ef4444;--shadow:0 24px 70px rgba(0,0,0,.45)}
*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:'DM Sans',sans-serif;background:var(--bg);color:var(--text)}body{overflow:hidden}button,input,textarea{font:inherit}button{cursor:pointer}.app{height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr);position:relative}.sidebar{border-right:1px solid var(--line);background:rgba(9,12,17,.94);display:flex;flex-direction:column;padding:18px;z-index:3}.brand{display:flex;align-items:center;gap:12px;padding:8px 4px 22px}.brand-mark{width:40px;height:40px;border-radius:13px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:grid;place-items:center;font-family:'Space Grotesk';font-weight:700;box-shadow:0 8px 28px rgba(139,92,246,.25)}.brand strong{font-family:'Space Grotesk';font-size:18px}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.new-chat{border:1px solid #2b3443;background:var(--panel2);color:#fff;border-radius:12px;padding:12px 14px;text-align:left;font-weight:600;margin-bottom:16px}.new-chat:hover{border-color:#475569}.nav-label{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:#657083;margin:10px 6px}.history{flex:1;overflow:auto}.history-item{width:100%;border:0;background:transparent;color:#b9c2cf;padding:10px;border-radius:10px;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.history-item:hover,.history-item.active{background:#151b25;color:#fff}.side-footer{border-top:1px solid var(--line);padding-top:14px}.user-chip{display:flex;align-items:center;gap:10px;padding:9px}.avatar{width:34px;height:34px;border-radius:50%;background:#171e2a;display:grid;place-items:center;font-size:13px;font-weight:700}.user-chip div:last-child{min-width:0}.user-name{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-plan{font-size:11px;color:var(--muted)}.logout{margin-left:auto;background:none;border:0;color:#778194}.main{min-width:0;min-height:0;height:100vh;display:flex;flex-direction:column;background:radial-gradient(circle at 50% -10%,rgba(139,92,246,.13),transparent 35%),var(--bg)}.topbar{height:70px;flex:0 0 70px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;background:rgba(7,9,13,.72);backdrop-filter:blur(16px)}.top-title{font-family:'Space Grotesk';font-size:16px}.status{display:flex;align-items:center;gap:7px;color:#93a0b2;font-size:12px}.dot{width:7px;height:7px;border-radius:50%;background:var(--good);box-shadow:0 0 12px var(--good)}.chat{position:relative;flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;scroll-behavior:smooth;scrollbar-width:none;-ms-overflow-style:none}.chat::-webkit-scrollbar{display:none;width:0;height:0}.welcome{max-width:920px;margin:0 auto;padding:70px 28px 40px}.eyebrow{display:inline-flex;gap:8px;align-items:center;color:#b8a6ff;background:rgba(139,92,246,.1);border:1px solid rgba(139,92,246,.2);padding:7px 10px;border-radius:999px;font-size:12px}.welcome h1{font-family:'Space Grotesk';font-size:clamp(38px,6vw,68px);line-height:1.02;letter-spacing:-.05em;margin:18px 0 14px;max-width:780px}.gradient{background:linear-gradient(90deg,#fff,#b8a6ff 45%,#67e8f9);-webkit-background-clip:text;background-clip:text;color:transparent}.welcome p{color:var(--muted);font-size:16px;max-width:650px;line-height:1.7}.quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:32px}.quick{border:1px solid var(--line);background:rgba(13,17,24,.72);border-radius:16px;padding:18px;text-align:left;color:#dbe3ed;transition:.2s}.quick:hover{transform:translateY(-2px);border-color:#3c4657;background:#111722}.quick b{display:block;margin-bottom:7px}.quick span{font-size:12px;color:var(--muted)}.messages{max-width:920px;margin:0 auto;padding:34px 28px 36px}.message{display:flex;gap:13px;margin:24px 0}.message.user{justify-content:flex-end}.message .bubble{max-width:760px;border-radius:17px;padding:14px 16px;line-height:1.7;white-space:pre-wrap}.message.ai .bubble{background:transparent;padding-left:0}.message.ai .avatar{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}.composer-wrap{flex:0 0 auto;position:relative;z-index:5}.composer{position:relative;bottom:auto;left:auto;right:auto;padding:14px 28px 20px;background:linear-gradient(var(--bg) 0%,var(--bg) 70%,rgba(7,9,13,.98) 100%)}.composer-inner{max-width:920px;margin:auto;border:1px solid #303949;background:#0e141d;border-radius:20px;padding:10px;box-shadow:var(--shadow);display:flex;align-items:flex-end;gap:9px}.composer textarea{flex:1;background:transparent;border:0;outline:0;color:#fff;resize:none;min-height:46px;max-height:160px;padding:12px 10px}.composer textarea::placeholder{color:#667185}.composer-hint{max-width:920px;margin:7px auto 0;text-align:center;color:#596476;font-size:11px}.icon-btn,.send{width:42px;height:42px;border:0;border-radius:12px;display:grid;place-items:center}.icon-btn{background:#171e29;color:#9ca8b8}.send{background:linear-gradient(135deg,var(--accent),#6d5dfc);color:#fff}.send:disabled{opacity:.45}.modal{position:fixed;inset:0;background:rgba(0,0,0,.7);backdrop-filter:blur(10px);display:none;place-items:center;z-index:20;padding:20px}.modal.open{display:grid}.auth-card{width:min(430px,100%);background:#0d1118;border:1px solid #2a3341;border-radius:24px;padding:28px;box-shadow:var(--shadow)}.auth-card h2{font-family:'Space Grotesk';margin:0 0 8px;font-size:28px}.auth-card p{color:var(--muted);font-size:13px;line-height:1.6}.field{margin:16px 0}.field label{display:block;font-size:12px;color:#9ba6b7;margin-bottom:7px}.field input{width:100%;background:#090d13;border:1px solid #293342;border-radius:12px;padding:12px;color:#fff;outline:none}.field input:focus{border-color:var(--accent)}.primary{width:100%;border:0;border-radius:12px;padding:13px;background:linear-gradient(135deg,var(--accent),#6d5dfc);color:#fff;font-weight:700}.google{width:100%;margin-top:10px;border:1px solid #303949;background:#141a23;color:#fff;border-radius:12px;padding:12px;font-weight:600}.divider{display:flex;align-items:center;gap:10px;color:#596476;font-size:11px;margin:16px 0}.divider:before,.divider:after{content:'';height:1px;background:var(--line);flex:1}.auth-switch{text-align:center;color:var(--muted);font-size:12px;margin-top:16px}.link{color:#b8a6ff;background:none;border:0}.close{float:right;background:none;border:0;color:#7d899a;font-size:22px}.toast{position:fixed;right:22px;bottom:22px;background:#151c27;border:1px solid #303949;color:#fff;border-radius:12px;padding:12px 15px;z-index:50;display:none;max-width:330px;font-size:13px}.toast.show{display:block}.typing{opacity:.7}.image-result{max-width:100%;border-radius:16px;margin-top:12px;border:1px solid var(--line)}@media(max-width:820px){.app{grid-template-columns:1fr}.sidebar{display:none}.topbar{padding:0 16px}.welcome,.messages{padding-left:18px;padding-right:18px}.quick-grid{grid-template-columns:1fr}.composer{padding:10px 12px 14px}.composer-hint{font-size:10px}.welcome{padding-top:50px}.welcome h1{font-size:43px}}

/* Desktop-first polish */
@media(min-width:821px){
  .app{grid-template-columns:280px minmax(0,1fr)}
  .sidebar{padding:22px 18px}
  .topbar{height:76px;flex-basis:76px;padding:0 34px}
  .top-title{font-size:17px}
  .chat{min-height:0}
  .welcome,.messages,.composer-inner,.composer-hint{max-width:980px}
  .welcome{padding-top:82px;padding-bottom:48px}
  .quick-grid{gap:14px}
  .quick{min-height:112px;padding:20px}
  .messages{padding-top:38px;padding-bottom:42px}
  .composer{padding:16px 34px 22px}
  .composer-inner{border-radius:22px;padding:11px}
  .composer textarea{min-height:48px}
}