:root{
  --c1:#8b5cf6; --c2:#22d3ee; --c3:#e879f9;
  --bg:#07070d; --bg2:#0d0d17; --panel:rgba(255,255,255,.04);
  --border:rgba(255,255,255,.08); --text:#eef0f6; --muted:#8b90a6;
  --glass:rgba(20,20,34,.55);
}
[data-theme="light"]{
  --bg:#eef0f8; --bg2:#f6f7fc; --panel:rgba(255,255,255,.75);
  --border:rgba(20,20,40,.09); --text:#141426; --muted:#5a5f78;
  --glass:rgba(255,255,255,.7);
}
*{box-sizing:border-box; margin:0; padding:0; -webkit-tap-highlight-color:transparent;}
html,body{height:100%;}
body{
  background:var(--bg); color:var(--text);
  font-family:'Space Grotesk','Vazirmatn',sans-serif;
  overflow-x:hidden;
}
#root{min-height:100vh;}
a{color:var(--c2); text-decoration:none;}
a:hover{text-shadow:0 0 12px var(--c2);}
button{font-family:inherit; cursor:pointer; border:none; background:none; color:inherit;}

/* ---- Aurora bg ---- */
.aurora{position:fixed; inset:0; z-index:0; overflow:hidden; pointer-events:none;
  background:radial-gradient(ellipse at 20% 0%, rgba(30,20,60,.6), transparent 60%),
             radial-gradient(ellipse at 100% 100%, rgba(15,25,50,.6), transparent 60%),
             var(--bg);}
[data-theme="light"] .aurora{background:radial-gradient(ellipse at 20% 0%, rgba(200,190,255,.5), transparent 60%),
             radial-gradient(ellipse at 100% 100%, rgba(190,220,255,.5), transparent 60%), var(--bg);}
.blob{position:absolute; border-radius:50%; filter:blur(90px); opacity:.55; mix-blend-mode:screen;}
.b1{width:46vw; height:46vw; background:var(--c1); top:-10%; left:-5%; animation:float1 18s ease-in-out infinite;}
.b2{width:40vw; height:40vw; background:var(--c2); bottom:-15%; right:-8%; animation:float2 22s ease-in-out infinite;}
.b3{width:34vw; height:34vw; background:var(--c3); top:35%; left:45%; animation:float3 26s ease-in-out infinite;}
[data-theme="light"] .blob{opacity:.4;}
@keyframes float1{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(8vw,10vh) scale(1.15)}}
@keyframes float2{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(-10vw,-8vh) scale(1.2)}}
@keyframes float3{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(-8vw,6vh) scale(.85)}66%{transform:translate(6vw,-6vh) scale(1.1)}}
.grid-overlay{position:absolute; inset:0; opacity:.06;
  background-image:linear-gradient(var(--text) 1px,transparent 1px),linear-gradient(90deg,var(--text) 1px,transparent 1px);
  background-size:48px 48px; mask-image:radial-gradient(ellipse at center, black, transparent 75%);}

/* ---- reveal ---- */
.reveal{opacity:0; transform:translateY(24px); animation:reveal .8s cubic-bezier(.2,.8,.2,1) forwards;}
@keyframes reveal{to{opacity:1; transform:translateY(0);}}

/* ---- brand ---- */
.brand-mark{display:flex; align-items:center; gap:12px;}
.brand-mark.small{gap:9px;}
.logo-orb{width:26px; height:26px; border-radius:50%;
  background:conic-gradient(from 0deg,var(--c1),var(--c2),var(--c3),var(--c1));
  box-shadow:0 0 18px var(--c1),0 0 34px var(--c3); animation:spin 6s linear infinite;}
.brand-mark.small .logo-orb{width:20px;height:20px;}
@keyframes spin{to{transform:rotate(360deg);}}
.brand-name{font-weight:700; font-size:1.35rem; letter-spacing:.02em;}
.glow-text{background:linear-gradient(90deg,var(--c1),var(--c2),var(--c3));
  -webkit-background-clip:text; background-clip:text; color:transparent;
  filter:drop-shadow(0 0 10px rgba(140,120,255,.4));}
.grad-text{background:linear-gradient(100deg,var(--c1),var(--c2) 45%,var(--c3));
  -webkit-background-clip:text; background-clip:text; color:transparent;}

/* ---- Landing ---- */
.landing{position:relative; z-index:1; min-height:100vh; display:flex; flex-direction:column;}
.land-nav{position:relative; z-index:2; display:flex; justify-content:space-between; align-items:center;
  padding:22px clamp(18px,5vw,64px);}
.nav-right{display:flex; gap:10px;}
.chip-btn{padding:8px 14px; border-radius:12px; background:var(--panel);
  border:1px solid var(--border); backdrop-filter:blur(12px); font-size:.85rem; font-weight:600;
  transition:.25s;}
.chip-btn:hover{border-color:var(--c2); box-shadow:0 0 16px rgba(34,211,238,.35); transform:translateY(-2px);}
.hero{flex:1; display:flex; flex-direction:column; align-items:center; justify-content:center;
  text-align:center; padding:40px clamp(18px,5vw,64px) 20px; gap:18px;}
.hero-badge{padding:7px 18px; border-radius:999px; background:var(--panel); border:1px solid var(--border);
  font-size:.82rem; letter-spacing:.04em; backdrop-filter:blur(12px); color:var(--muted);}
.hero-title{font-size:clamp(3.4rem,12vw,8rem); font-weight:700; line-height:.95; letter-spacing:-.02em;
  filter:drop-shadow(0 0 40px rgba(140,120,255,.35));}
.hero-sub{font-size:clamp(1.1rem,3.5vw,1.7rem); font-weight:300; color:var(--text); min-height:1.4em;}
.caret{display:inline-block; width:2px; height:1em; background:var(--c2); margin-inline-start:4px;
  vertical-align:-2px; animation:blink 1s step-end infinite; box-shadow:0 0 8px var(--c2);}
@keyframes blink{50%{opacity:0;}}
.hero-cta{display:flex; gap:14px; margin-top:14px; flex-wrap:wrap; justify-content:center;}
.btn-primary{position:relative; overflow:hidden; padding:15px 36px; border-radius:16px; font-size:1.05rem; font-weight:600;
  background:linear-gradient(100deg,var(--c1),var(--c3)); color:#fff;
  box-shadow:0 0 24px rgba(140,120,255,.5),0 6px 30px rgba(232,121,249,.35); transition:.3s;}
.btn-primary:hover{transform:translateY(-3px) scale(1.03); box-shadow:0 0 40px rgba(140,120,255,.7),0 10px 40px rgba(232,121,249,.5);}
.btn-shine{position:absolute; top:0; left:-60%; width:40%; height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.5),transparent); transform:skewX(-20deg);
  animation:shine 3.5s ease-in-out infinite;}
@keyframes shine{0%{left:-60%}40%,100%{left:140%}}
.btn-ghost{padding:15px 30px; border-radius:16px; font-weight:600; border:1px solid var(--border);
  background:var(--panel); backdrop-filter:blur(12px); transition:.3s;}
.btn-ghost:hover{border-color:var(--c2); box-shadow:0 0 20px rgba(34,211,238,.4);}
.prompt-chips{display:flex; gap:12px; flex-wrap:wrap; justify-content:center; margin-top:30px; max-width:760px;}
.float-chip{padding:11px 18px; border-radius:14px; font-size:.9rem; background:var(--glass);
  border:1px solid var(--border); backdrop-filter:blur(14px); color:var(--muted);
  animation:bob 4s ease-in-out infinite; transition:color .25s,border-color .25s,box-shadow .25s;}
.float-chip:hover{color:var(--text); border-color:var(--c3); box-shadow:0 0 18px rgba(232,121,249,.4);}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}

.features{position:relative; z-index:2; display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:20px; padding:60px clamp(18px,5vw,64px); max-width:1200px; margin:0 auto; width:100%;}
.feature-card{position:relative; overflow:hidden; padding:28px 24px; border-radius:22px; background:var(--glass);
  border:1px solid var(--border); backdrop-filter:blur(16px); transition:transform .4s,box-shadow .4s;}
.feature-card:hover{transform:translateY(-8px) rotateX(4deg); box-shadow:0 20px 50px rgba(140,120,255,.25);}
.feat-glow{position:absolute; top:-40%; inset-inline-end:-30%; width:60%; height:80%; border-radius:50%;
  background:radial-gradient(circle,var(--c1),transparent 70%); opacity:.25; filter:blur(20px);}
.feat-num{font-family:'JetBrains Mono',monospace; font-size:.85rem; color:var(--c2); letter-spacing:.15em;}
.feature-card h3{font-size:1.35rem; font-weight:600; margin:12px 0 8px; position:relative;}
.feature-card p{color:var(--muted); line-height:1.7; font-size:.95rem; position:relative; font-weight:300;}
.accent-strip{display:flex; gap:12px; justify-content:center; padding:10px 0 30px;}
.accent-dot{width:30px; height:30px; border-radius:50%; border:2px solid transparent; transition:.25s;}
.accent-dot:hover{transform:scale(1.2);}
.accent-dot.active{border-color:#fff; box-shadow:0 0 16px rgba(255,255,255,.5);}
.land-footer{text-align:center; padding:26px; color:var(--muted); font-size:.85rem; border-top:1px solid var(--border);}

/* ---- Chat app ---- */
.chat-app{position:relative; z-index:1; min-height:100vh; display:flex;}
.sidebar{position:relative; z-index:5; width:290px; flex-shrink:0; height:100vh; display:flex; flex-direction:column;
  gap:14px; padding:18px 14px; background:var(--glass); backdrop-filter:blur(22px);
  border-inline-end:1px solid var(--border); transition:transform .4s cubic-bezier(.2,.8,.2,1),width .3s;}
.sidebar.closed{width:0; padding:0; overflow:hidden; border:none;}
.sidebar.mobile{position:fixed; top:0; inset-inline-start:0; width:280px; box-shadow:0 0 60px rgba(0,0,0,.6);}
.sidebar.mobile.closed{transform:translateX(-110%);}
[dir="rtl"] .sidebar.mobile.closed{transform:translateX(110%);}
.sidebar.mobile.open{transform:translateX(0);}
.sb-backdrop{position:fixed; inset:0; z-index:4; background:rgba(0,0,0,.55); backdrop-filter:blur(2px);}
.sb-head{padding:6px 8px 0;}
.new-chat-btn{display:flex; align-items:center; gap:8px; justify-content:center; padding:13px; border-radius:14px;
  font-weight:600; background:linear-gradient(100deg,var(--c1),var(--c3)); color:#fff;
  box-shadow:0 0 22px rgba(140,120,255,.5); transition:.28s;}
.new-chat-btn:hover{transform:translateY(-2px); box-shadow:0 0 32px rgba(232,121,249,.6);}
.plus{font-size:1.3rem; line-height:1;}
.sb-search input{width:100%; padding:11px 14px; border-radius:12px; background:var(--panel);
  border:1px solid var(--border); color:var(--text); font-size:.9rem; outline:none; transition:.25s;}
.sb-search input:focus{border-color:var(--c2); box-shadow:0 0 14px rgba(34,211,238,.3);}
.convo-list{flex:1; overflow-y:auto; margin:0 -6px; padding:0 6px;}
.convo-list::-webkit-scrollbar{width:6px;}
.convo-list::-webkit-scrollbar-thumb{background:var(--border); border-radius:3px;}
.group-label{font-size:.72rem; text-transform:uppercase; letter-spacing:.12em; color:var(--muted);
  padding:14px 8px 6px; font-weight:600;}
.convo-item{display:flex; align-items:center; gap:9px; padding:10px 11px; border-radius:12px; cursor:pointer;
  transition:.2s; position:relative; margin-bottom:2px; border:1px solid transparent;}
.convo-item:hover{background:var(--panel); border-color:var(--border);}
.convo-item.active{background:var(--panel); border-color:var(--c1); box-shadow:0 0 16px rgba(140,120,255,.25) inset;}
.convo-icon{color:var(--c2); font-size:.8rem;}
.convo-title{flex:1; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; font-size:.9rem; font-weight:300;}
.rename-input{flex:1; background:var(--bg2); border:1px solid var(--c2); border-radius:8px; padding:4px 8px;
  color:var(--text); font-size:.9rem; outline:none;}
.convo-del{opacity:0; font-size:1.2rem; color:var(--muted); width:22px; transition:.2s;}
.convo-item:hover .convo-del{opacity:1;}
.convo-del:hover{color:#ff5c8a; text-shadow:0 0 10px #ff5c8a;}
.sb-user{display:flex; align-items:center; gap:11px; padding:12px; border-radius:14px; background:var(--panel);
  border:1px solid var(--border);}
.user-avatar{width:38px; height:38px; border-radius:12px; display:grid; place-items:center; font-weight:700;
  background:linear-gradient(135deg,var(--c1),var(--c3)); color:#fff; box-shadow:0 0 16px rgba(140,120,255,.4);}
.user-meta{display:flex; flex-direction:column;}
.user-name{font-weight:500; font-size:.92rem;}
.user-plan{font-size:.72rem; color:var(--muted);}

.chat-main{flex:1; display:flex; flex-direction:column; min-width:0; height:100vh;}
.chat-top{display:flex; align-items:center; gap:10px; padding:12px clamp(12px,3vw,28px);
  border-bottom:1px solid var(--border); background:var(--glass); backdrop-filter:blur(18px); z-index:3;}
.hamburger,.home-btn{width:40px; height:40px; border-radius:11px; background:var(--panel); border:1px solid var(--border);
  font-size:1.15rem; display:grid; place-items:center; transition:.25s;}
.hamburger:hover,.home-btn:hover{border-color:var(--c2); box-shadow:0 0 14px rgba(34,211,238,.35);}
.top-right{margin-inline-start:auto; display:flex; gap:8px;}

.model-select{position:relative;}
.model-btn{display:flex; align-items:center; gap:9px; padding:9px 15px; border-radius:12px; font-weight:600;
  background:var(--panel); border:1px solid var(--border); transition:.25s; font-size:.92rem;}
.model-btn:hover{border-color:var(--c1); box-shadow:0 0 16px rgba(140,120,255,.3);}
.model-dot{width:9px; height:9px; border-radius:50%; box-shadow:0 0 8px currentColor;}
.chevron{font-size:.7rem; transition:transform .25s;}
.chevron.up{transform:rotate(180deg);}
.model-menu{position:absolute; top:calc(100% + 8px); inset-inline-start:0; min-width:210px; padding:6px;
  border-radius:14px; background:var(--glass); backdrop-filter:blur(22px); border:1px solid var(--border);
  box-shadow:0 20px 50px rgba(0,0,0,.5); z-index:20; animation:pop .25s ease;}
@keyframes pop{from{opacity:0; transform:translateY(-8px) scale(.96);}to{opacity:1;}}
.model-opt{display:flex; align-items:center; gap:10px; width:100%; padding:11px 13px; border-radius:10px;
  font-size:.9rem; transition:.18s; text-align:start;}
.model-opt:hover{background:var(--panel);}
.model-opt.active{background:var(--panel); box-shadow:0 0 14px rgba(140,120,255,.25) inset;}

.chat-scroll{flex:1; overflow-y:auto; padding:24px clamp(12px,4vw,40px) 10px;}
.chat-scroll::-webkit-scrollbar{width:8px;}
.chat-scroll::-webkit-scrollbar-thumb{background:var(--border); border-radius:4px;}
.thread{max-width:820px; margin:0 auto; display:flex; flex-direction:column; gap:22px; padding-bottom:20px;}

.empty-state{max-width:760px; margin:0 auto; text-align:center; padding-top:6vh; display:flex; flex-direction:column;
  align-items:center; gap:26px;}
.empty-orb{width:90px; height:90px; border-radius:50%;
  background:conic-gradient(from 0deg,var(--c1),var(--c2),var(--c3),var(--c1));
  box-shadow:0 0 40px var(--c1),0 0 80px var(--c3); animation:spin 8s linear infinite,pulseOrb 3s ease-in-out infinite;}
@keyframes pulseOrb{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}
.empty-state h2{font-size:clamp(1.6rem,5vw,2.6rem); font-weight:600;}
.suggest-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:14px; width:100%;}
.suggest-card{padding:18px 20px; border-radius:16px; text-align:start; font-size:.95rem; font-weight:300;
  background:var(--glass); border:1px solid var(--border); backdrop-filter:blur(14px); color:var(--muted);
  transition:.3s;}
.suggest-card:hover{color:var(--text); transform:translateY(-4px); border-color:var(--c1);
  box-shadow:0 0 24px rgba(140,120,255,.35);}

/* ---- messages ---- */
.msg-row{display:flex; gap:12px; align-items:flex-start;}
.msg-row.user{flex-direction:row-reverse;}
.msg-in{animation:msgIn .5s cubic-bezier(.2,.8,.2,1);}
@keyframes msgIn{from{opacity:0; transform:translateY(16px);}}
.ai-orb{width:34px; height:34px; border-radius:11px; flex-shrink:0; margin-top:2px;
  background:radial-gradient(circle at 30% 30%,var(--orb),#000);
  box-shadow:0 0 16px var(--orb); animation:pulseOrb 3s ease-in-out infinite;}
.msg-wrap{max-width:82%; display:flex; flex-direction:column; gap:6px;}
.msg-row.user .msg-wrap{align-items:flex-end;}
.bubble{padding:14px 18px; border-radius:18px; line-height:1.75; font-size:.98rem; font-weight:300;}
.bubble-user{background:linear-gradient(120deg,var(--c1),var(--c3)); color:#fff;
  border-bottom-right-radius:6px; box-shadow:0 6px 24px rgba(140,120,255,.35);}
[dir="rtl"] .bubble-user{border-bottom-right-radius:18px; border-bottom-left-radius:6px;}
.bubble-ai{background:var(--glass); border:1px solid var(--border); backdrop-filter:blur(14px);
  border-bottom-left-radius:6px;}
[dir="rtl"] .bubble-ai{border-bottom-left-radius:18px; border-bottom-right-radius:6px;}
.nc-p{margin:0 0 2px;}
.nc-bold{color:var(--c2); font-weight:600;}
.nc-inline{font-family:'JetBrains Mono',monospace; background:rgba(140,120,255,.15); padding:2px 6px;
  border-radius:6px; font-size:.85em; color:var(--c3);}
.nc-li{display:flex; gap:8px; align-items:flex-start; padding:3px 0;}
.nc-bullet{color:var(--c2); font-weight:700;}
.code-block{margin:10px 0; border-radius:12px; overflow:hidden; border:1px solid var(--border);
  background:#0a0a14;}
.code-bar{display:flex; align-items:center; justify-content:space-between; padding:7px 12px;
  background:rgba(255,255,255,.04); border-bottom:1px solid var(--border);}
.code-dots{display:flex; gap:5px;}
.code-dots i{width:9px; height:9px; border-radius:50%; display:block;}
.code-dots i:nth-child(1){background:#ff5f56;}
.code-dots i:nth-child(2){background:#ffbd2e;}
.code-dots i:nth-child(3){background:#27c93f;}
.code-copy{font-size:.78rem; color:var(--c2); font-weight:600; transition:.2s;}
.code-copy:hover{text-shadow:0 0 10px var(--c2);}
.code-block pre{margin:0; padding:14px; overflow-x:auto;}
.code-block code{font-family:'JetBrains Mono',monospace; font-size:.85rem; color:#c8d0ff; line-height:1.6;}
.thinking{display:flex; align-items:center; gap:6px;}
.dot{width:8px; height:8px; border-radius:50%; background:var(--c2); box-shadow:0 0 10px var(--c2);
  animation:bounce 1.2s infinite;}
.dot:nth-child(2){animation-delay:.15s; background:var(--c1); box-shadow:0 0 10px var(--c1);}
.dot:nth-child(3){animation-delay:.3s; background:var(--c3); box-shadow:0 0 10px var(--c3);}
@keyframes bounce{0%,60%,100%{transform:translateY(0); opacity:.5;}30%{transform:translateY(-7px); opacity:1;}}
.think-label{color:var(--muted); font-size:.85rem; margin-inline-start:6px;}
.msg-actions{display:flex; align-items:center; gap:6px; opacity:.6; transition:opacity .2s;}
.msg-row:hover .msg-actions{opacity:1;}
.model-tag{font-size:.72rem; color:var(--muted); font-family:'JetBrains Mono',monospace; margin-inline-end:4px;}
.act-btn{width:28px; height:28px; border-radius:8px; font-size:.8rem; color:var(--muted); transition:.2s;}
.act-btn:hover{background:var(--panel); color:var(--text); transform:scale(1.15);}
.act-btn.liked{color:#27c93f; text-shadow:0 0 10px #27c93f;}
.act-btn.disliked{color:#ff5c8a; text-shadow:0 0 10px #ff5c8a;}

/* ---- composer ---- */
.composer-wrap{padding:8px clamp(12px,4vw,40px) 16px;}
.composer{position:relative; max-width:820px; margin:0 auto; display:flex; align-items:flex-end; gap:8px;
  padding:9px 10px; border-radius:20px; background:var(--glass); backdrop-filter:blur(18px);
  border:1px solid var(--border); transition:border-color .3s,box-shadow .3s;}
.composer:focus-within{border-color:var(--c1); box-shadow:0 0 28px rgba(140,120,255,.35);}
.composer-glow{position:absolute; inset:-1px; border-radius:20px; pointer-events:none; opacity:0;
  background:linear-gradient(100deg,var(--c1),var(--c2),var(--c3)); filter:blur(14px); z-index:-1; transition:.3s;}
.composer:focus-within .composer-glow{opacity:.4;}
.comp-icon{width:38px; height:38px; border-radius:12px; font-size:1.05rem; display:grid; place-items:center;
  transition:.2s; flex-shrink:0;}
.comp-icon:hover{background:var(--panel); transform:scale(1.1);}
.comp-input{flex:1; resize:none; background:none; border:none; outline:none; color:var(--text);
  font-family:inherit; font-size:1rem; line-height:1.5; padding:9px 4px; max-height:180px; font-weight:300;}
.comp-input::placeholder{color:var(--muted);}
.send-btn{width:44px; height:44px; border-radius:14px; font-size:1.05rem; flex-shrink:0; display:grid; place-items:center;
  background:var(--panel); border:1px solid var(--border); color:var(--muted); transition:.25s;}
[dir="rtl"] .send-btn{transform:scaleX(-1);}
.send-btn.ready{background:linear-gradient(120deg,var(--c1),var(--c3)); color:#fff;
  box-shadow:0 0 20px rgba(140,120,255,.5);}
.send-btn.ready:hover{transform:translateY(-2px) scale(1.06);}
[dir="rtl"] .send-btn.ready:hover{transform:translateY(-2px) scale(1.06) scaleX(-1);}
.send-btn.stop{background:#ff3b6b; color:#fff; box-shadow:0 0 22px rgba(255,59,107,.6); transform:none;
  animation:pulseStop 1.2s ease-in-out infinite;}
@keyframes pulseStop{50%{box-shadow:0 0 34px rgba(255,59,107,.9);}}
.disclaimer{text-align:center; margin-top:10px; font-size:.75rem; color:var(--muted);}

/* ---- settings modal ---- */
.modal-backdrop{position:fixed; inset:0; z-index:100; background:rgba(0,0,0,.6); backdrop-filter:blur(6px);
  display:grid; place-items:center; padding:20px; animation:fade .3s;}
@keyframes fade{from{opacity:0;}}
.modal{position:relative; width:100%; max-width:460px; max-height:90vh; overflow-y:auto; border-radius:24px;
  background:var(--glass); backdrop-filter:blur(28px); border:1px solid var(--border); padding:28px;
  box-shadow:0 30px 80px rgba(0,0,0,.6); animation:pop .35s cubic-bezier(.2,.8,.2,1);}
.modal-glow{position:absolute; top:-30%; inset-inline-start:20%; width:60%; height:50%; border-radius:50%;
  background:radial-gradient(circle,var(--c1),transparent 70%); opacity:.2; filter:blur(30px); pointer-events:none;}
.modal-head{display:flex; justify-content:space-between; align-items:center; margin-bottom:20px;}
.modal-head h2{font-size:1.5rem; font-weight:600;}
.modal-close{width:36px; height:36px; border-radius:10px; font-size:1.4rem; color:var(--muted); transition:.2s;}
.modal-close:hover{background:var(--panel); color:var(--text); transform:rotate(90deg);}
.set-section{margin-bottom:20px; position:relative;}
.set-section label{display:block; font-size:.85rem; color:var(--muted); margin-bottom:9px; font-weight:500;}
.set-input{width:100%; padding:12px 14px; border-radius:12px; background:var(--panel); border:1px solid var(--border);
  color:var(--text); font-size:.95rem; outline:none; transition:.25s;}
.set-input:focus{border-color:var(--c2); box-shadow:0 0 14px rgba(34,211,238,.3);}
.seg{display:flex; gap:8px;}
.seg button{flex:1; padding:11px; border-radius:11px; background:var(--panel); border:1px solid var(--border);
  font-weight:500; transition:.25s; font-size:.9rem;}
.seg button.on{background:linear-gradient(120deg,var(--c1),var(--c3)); color:#fff; border-color:transparent;
  box-shadow:0 0 18px rgba(140,120,255,.4);}
.accent-row{display:flex; gap:12px;}
.set-range{width:100%; -webkit-appearance:none; height:6px; border-radius:3px; outline:none;
  background:linear-gradient(90deg,var(--c1),var(--c3));}
.set-range::-webkit-slider-thumb{-webkit-appearance:none; width:20px; height:20px; border-radius:50%;
  background:#fff; box-shadow:0 0 14px var(--c1); cursor:pointer;}
.set-about{font-size:.8rem; color:var(--muted); text-align:center; padding-top:8px; border-top:1px solid var(--border);}

/* ---- toast ---- */
.toast{position:fixed; bottom:100px; left:50%; transform:translateX(-50%); z-index:200;
  padding:11px 22px; border-radius:14px; background:var(--glass); backdrop-filter:blur(18px);
  border:1px solid var(--c2); font-weight:600; font-size:.9rem;
  box-shadow:0 0 24px rgba(34,211,238,.4); animation:toastIn .3s;}
@keyframes toastIn{from{opacity:0; transform:translate(-50%,16px);}}

@media(max-width:900px){
  .msg-wrap{max-width:88%;}
  .chat-top{gap:6px;}
}
@media(max-width:520px){
  .hero-title{font-size:3rem;}
  .top-right .chip-btn{padding:8px 10px;}
  .model-btn{padding:8px 10px; font-size:.82rem;}
}