:root{
  --bg:#070b14; --bg-2:#0c1322; --panel:#0f1829; --panel-2:#142036; --line:#1d2b45;
  --text:#e7f0fb; --muted:#8aa0bd; --accent:#6cc3f5; --accent-2:#3a8fd6; --accent-soft:rgba(108,195,245,.12);
  --danger:#ff6b7d; --radius:14px;
  --grad:linear-gradient(135deg,#b3e5ff 0%,#6cc3f5 45%,#3a8fd6 100%);
}
*{box-sizing:border-box;margin:0}
html,body{height:100%}
body{font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
input,textarea{font:inherit;color:var(--text)}
a{color:var(--accent)}
.hidden{display:none!important}
.error{color:var(--danger);font-size:13px;min-height:18px}
.muted{color:var(--muted);font-size:14px}

/* brand */
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:17px;letter-spacing:-.01em}
.brand img{width:34px}
.brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:700}
.brand.big{font-size:28px;justify-content:center}
.brand.big img{width:58px}

/* ---------- auth ---------- */
.auth{min-height:100%;display:grid;place-items:center;padding:24px;position:relative;overflow:hidden}
.auth-glow{position:absolute;width:700px;height:700px;border-radius:50%;background:radial-gradient(circle,rgba(58,143,214,.25),transparent 65%);top:-250px;left:50%;transform:translateX(-50%);pointer-events:none}
.auth-card{position:relative;width:100%;max-width:400px;background:rgba(15,24,41,.85);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:20px;padding:36px 30px 22px}
.auth-sub{text-align:center;color:var(--muted);margin:6px 0 24px}
.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--bg-2);border-radius:10px;padding:4px;margin-bottom:20px}
.tab{padding:8px;border-radius:8px;color:var(--muted);font-weight:500;font-size:14px}
.tab.active{background:var(--panel-2);color:var(--text)}
#authForm{display:flex;flex-direction:column;gap:14px}
#authForm label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted);font-weight:500}
#authForm input[type=email],#authForm input[type=password],#authForm input[type=text],.modal input{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:11px 13px;outline:none;transition:border .15s}
#authForm input:focus,.modal input:focus{border-color:var(--accent)}
#authForm .check{flex-direction:row;align-items:flex-start;gap:8px;font-weight:400}
.check input{margin-top:4px;accent-color:var(--accent)}
.btn-primary{background:var(--grad);color:#04121f;font-weight:600;padding:12px;border-radius:10px;transition:filter .15s,transform .1s}
.btn-primary:hover{filter:brightness(1.08)}
.btn-primary:active{transform:scale(.99)}
.btn-primary:disabled{opacity:.6;cursor:default}
.legal{text-align:center;font-size:12px;color:var(--muted);margin-top:22px}
.legal a{color:var(--muted);text-decoration:none}
.legal a:hover{color:var(--text)}

/* ---------- app layout ---------- */
.app{display:flex;height:100dvh}
.sidebar{width:272px;flex-shrink:0;background:var(--bg-2);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:16px 12px}
.side-top{display:flex;justify-content:space-between;align-items:center;padding:0 6px 16px}
.btn-new{display:flex;align-items:center;gap:8px;padding:10px 14px;border:1px solid var(--line);border-radius:10px;font-weight:500;font-size:14px;transition:background .15s,border .15s}
.btn-new:hover{background:var(--accent-soft);border-color:rgba(108,195,245,.35)}
.btn-new span{color:var(--accent);font-size:16px}
.chat-list-label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:20px 8px 6px}
.chat-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px}
.chat-item{display:flex;align-items:center;gap:6px;padding:8px 10px;border-radius:8px;font-size:14px;color:#c6d4e6;cursor:pointer;text-align:left}
.chat-item:hover{background:var(--panel)}
.chat-item.active{background:var(--panel-2);color:var(--text)}
.chat-item .t{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-item .acts{display:none;gap:2px}
.chat-item:hover .acts,.chat-item.active .acts{display:flex}
.chat-item .acts button{opacity:.6;font-size:12px;padding:2px 4px;border-radius:4px}
.chat-item .acts button:hover{opacity:1;background:var(--line)}
.side-bottom{border-top:1px solid var(--line);padding-top:12px;display:flex;flex-direction:column;gap:12px}
.credits{padding:0 6px}
.credits-row{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}
.credits-row b{color:var(--text);font-weight:600}
.bar{height:4px;background:var(--line);border-radius:4px;margin-top:6px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--grad);width:0;transition:width .4s}
.user-row{display:flex;align-items:center;gap:10px;padding:6px}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--grad);color:#04121f;display:grid;place-items:center;font-weight:700;font-size:13px;flex-shrink:0}
.user-meta{flex:1;min-width:0}
.user-name{font-size:13px;font-weight:600}
.user-email{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.icon-btn{width:32px;height:32px;border-radius:8px;display:grid;place-items:center;color:var(--muted);font-size:16px}
.icon-btn:hover{background:var(--panel);color:var(--text)}

.main{flex:1;display:flex;flex-direction:column;min-width:0;background:radial-gradient(ellipse at top,rgba(58,143,214,.08),transparent 60%)}
.topbar{height:56px;display:flex;align-items:center;gap:12px;padding:0 20px;border-bottom:1px solid var(--line)}
.chat-title{flex:1;font-weight:500;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.model-tag{font-size:12px;color:var(--accent);background:var(--accent-soft);padding:3px 10px;border-radius:999px;font-family:'JetBrains Mono',monospace}

.messages{flex:1;overflow-y:auto;padding:24px 20px 8px}
.msg{max-width:760px;margin:0 auto 22px;display:flex;gap:14px}
.msg .who{width:30px;height:30px;border-radius:8px;flex-shrink:0;display:grid;place-items:center;font-size:12px;font-weight:700}
.msg.user{justify-content:flex-end}
.msg.user .bubble{background:var(--panel-2);border:1px solid var(--line);padding:10px 16px;border-radius:16px 16px 4px 16px;max-width:80%;white-space:pre-wrap;word-wrap:break-word}
.msg.assistant .who{background:var(--panel);border:1px solid var(--line)}
.msg.assistant .who img{width:20px}
.msg.assistant .bubble{flex:1;min-width:0;padding-top:3px}
.bubble p{margin:0 0 .8em}
.bubble p:last-child{margin-bottom:0}
.bubble ul,.bubble ol{margin:0 0 .8em 1.3em}
.bubble h1,.bubble h2,.bubble h3{font-size:1.05em;margin:1em 0 .4em}
.bubble code{font-family:'JetBrains Mono',monospace;font-size:.88em;background:var(--panel-2);padding:2px 6px;border-radius:5px}
.bubble pre{background:#050810;border:1px solid var(--line);border-radius:10px;padding:14px;overflow-x:auto;margin:0 0 .8em;position:relative}
.bubble pre code{background:none;padding:0;font-size:13px}
.copy-btn{position:absolute;top:8px;right:8px;font-size:11px;color:var(--muted);background:var(--panel);padding:3px 8px;border-radius:6px}
.bubble .err{color:var(--danger)}
.cursor::after{content:none}
@keyframes blink{50%{opacity:0}}
.typing{display:flex;gap:4px;padding-top:10px}
.typing i{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:bounce 1.2s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,60%,100%{opacity:.3;transform:none}30%{opacity:1;transform:translateY(-4px)}}

.empty{max-width:640px;margin:10vh auto 0;text-align:center}
.empty-logo{width:90px;filter:drop-shadow(0 0 30px rgba(108,195,245,.35))}
.empty h1{font-size:26px;font-weight:600;margin:14px 0 28px;letter-spacing:-.02em}
.suggestions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sugg{text-align:left;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:#c6d4e6;font-size:14px;transition:border .15s,background .15s}
.sugg:hover{border-color:rgba(108,195,245,.4);background:var(--panel-2)}

.composer{padding:8px 20px 14px}
.composer-box{max-width:760px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:8px 8px 8px 16px;transition:border .15s,box-shadow .15s}
.composer-box:focus-within{border-color:rgba(108,195,245,.5);box-shadow:0 0 0 4px rgba(108,195,245,.08)}
#input{flex:1;background:none;border:0;outline:none;resize:none;max-height:220px;padding:7px 0;line-height:1.5}
#input::placeholder{color:#5f7593}
.send{width:38px;height:38px;border-radius:12px;background:var(--grad);color:#04121f;display:grid;place-items:center;flex-shrink:0;transition:opacity .15s}
.send:disabled{opacity:.35;cursor:default}
.disclaimer{text-align:center;font-size:12px;color:#5f7593;margin-top:8px}

/* modal */
.modal{margin:auto;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:16px;padding:24px;width:min(400px,92vw)}
.modal::backdrop{background:rgba(0,0,0,.6);backdrop-filter:blur(3px)}
.modal h2{font-size:20px;margin-bottom:4px}
.modal h3{font-size:15px;margin-bottom:4px}
.modal hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.modal input{width:100%;margin-top:12px}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:8px}
.btn-ghost{padding:9px 16px;border:1px solid var(--line);border-radius:10px;font-size:14px;margin-top:14px}
.btn-ghost:hover{background:var(--panel-2)}
.btn-danger{padding:9px 16px;background:var(--danger);color:#1a0508;border-radius:10px;font-weight:600;font-size:14px;margin-top:14px}

.only-mobile{display:none}
.scrim{display:none}
@media (max-width:820px){
  .only-mobile{display:grid}
  .sidebar{position:fixed;inset:0 auto 0 0;z-index:20;transform:translateX(-100%);transition:transform .25s;width:84vw;max-width:300px}
  .sidebar.open{transform:none}
  .scrim.show{display:block;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:10}
  .topbar{padding:0 12px}
  .messages{padding:16px 14px 8px}
  .composer{padding:6px 10px 10px}
  .suggestions{grid-template-columns:1fr}
  .empty{margin-top:6vh}
  .model-tag{display:none}
}
a.brand{color:var(--text);text-decoration:none}
.empty-list{padding:6px 10px;font-size:13px}
.thinking{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px;padding-top:4px}.thinking .typing{padding-top:0}

/* ===== v2: messages ===== */
.user-col{display:flex;flex-direction:column;align-items:flex-end;gap:6px;max-width:80%}
.msg.user .user-col .bubble{max-width:100%}
.msg-images{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.msg-images img{max-width:220px;max-height:220px;border-radius:12px;border:1px solid var(--line);display:block}
.a-body{flex:1;min-width:0}
.msg.assistant .a-body .bubble{padding-top:3px}
.thought{margin-bottom:10px;border-left:2px solid var(--line);padding-left:12px}
.thought summary{cursor:pointer;list-style:none;color:var(--muted);font-size:13.5px;font-weight:500;display:inline-flex;align-items:center;gap:6px;user-select:none}
.thought summary::-webkit-details-marker{display:none}
.thought summary::after{content:'›';font-size:16px;transition:transform .15s}
.thought[open] summary::after{transform:rotate(90deg)}
.thought.live .thought-label{background:linear-gradient(90deg,var(--muted),var(--text),var(--muted));background-size:200% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:shimmer 1.6s linear infinite}
@keyframes shimmer{to{background-position:-200% 0}}
.thought-text{white-space:pre-wrap;color:#8ea4bf;font-size:13.5px;line-height:1.55;max-height:260px;overflow-y:auto;margin-top:8px}
.sources{margin-top:12px}
.sources-label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:6px}
.sources a{display:inline-flex;align-items:center;gap:6px;max-width:260px;margin:0 6px 6px 0;padding:5px 10px 5px 6px;border:1px solid var(--line);border-radius:999px;background:var(--panel);color:#c6d4e6;font-size:12.5px;text-decoration:none}
.sources a:hover{border-color:rgba(108,195,245,.4)}
.sources a b{width:18px;height:18px;border-radius:50%;background:var(--panel-2);display:grid;place-items:center;font-size:10.5px;color:var(--accent);flex-shrink:0}
.sources a span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bubble sup.cite{color:var(--accent);font-size:.72em;font-weight:600;margin-left:1px}
.msg-actions{display:flex;gap:4px;margin-top:8px}
.act{font-size:12px;color:var(--muted);padding:4px 10px;border-radius:7px;border:1px solid transparent}
.act:hover{background:var(--panel);border-color:var(--line);color:var(--text)}
.wall{max-width:760px;margin:0 auto 22px;border:1px solid rgba(108,195,245,.45);background:linear-gradient(180deg,rgba(108,195,245,.1),var(--panel));border-radius:16px;padding:24px;text-align:center}
.wall h3{font-size:19px;margin-bottom:6px}
.wall p{color:var(--muted);font-size:14.5px;margin-bottom:16px}
.wall-btns{display:flex;gap:10px;justify-content:center}
.wall-btns .btn-primary,.wall-btns .btn-ghost{margin:0;padding:10px 18px}

/* ===== v2: guest sidebar, top CTA, auth overlay, age gate ===== */
.guest-box{padding:4px 6px 6px;display:flex;flex-direction:column;gap:8px}
.guest-title{font-size:13.5px;font-weight:600}
.guest-sub{font-size:12.5px;color:var(--muted);line-height:1.45}
.guest-box .btn-primary{padding:10px}
.guest-box .btn-ghost{margin:0;padding:9px}
.top-cta{background:var(--grad);color:#04121f;font-weight:600;font-size:13px;padding:7px 14px;border-radius:9px}
.auth.overlay{position:fixed;inset:0;z-index:40;background:rgba(5,8,15,.88);backdrop-filter:blur(6px);min-height:0}
.auth-card{position:relative}
.auth-close{position:absolute;top:12px;right:12px}
.agegate{margin:auto;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:18px;padding:30px;width:min(420px,92vw);text-align:center}
.agegate::backdrop{background:rgba(3,6,12,.75);backdrop-filter:blur(4px)}
.agegate img{width:56px;margin-bottom:8px}
.agegate h3{font-size:20px;margin-bottom:8px}
.agegate p{color:var(--muted);font-size:14px;margin-bottom:22px}
.agebtns{display:flex;gap:10px;justify-content:center}
.agebtns .btn-ghost,.agebtns .btn-primary{margin:0;padding:10px 18px}
@media (max-width:820px){.model-tag{display:none}}

/* ===== infinity loader + live thinking ===== */
.inf{width:36px;height:17px;overflow:visible;flex-shrink:0;display:block}
.inf path{fill:none;stroke-width:6;stroke-linecap:round;stroke-linejoin:round}
.inf-track{stroke:rgba(108,195,245,.22)}
.inf-run{stroke:var(--accent);stroke-dasharray:24 76;animation:infrun 1.6s cubic-bezier(.45,.05,.55,.95) infinite;filter:drop-shadow(0 0 3px rgba(108,195,245,.9))}
.inf-run2{stroke:#b3e5ff;stroke-dasharray:5 95;animation-delay:-.12s;opacity:.9}
@keyframes infrun{from{stroke-dashoffset:0}to{stroke-dashoffset:-100}}
.waiting{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:14px;height:30px}
.thought-icon{display:inline-flex}
.thought-icon .inf{width:36px;height:17px;top:0}
.thought-icon{align-items:center}
.thought summary{min-height:30px;align-items:center}
.thought-icon:empty{display:none}
.thought.live summary{color:#b9cbe0}
.thought.live summary::after{display:none}
.thought.live .thought-label{max-width:min(560px,70vw);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:inline-block;vertical-align:middle}
.thought-label.swap{animation:swapin .35s ease}
@keyframes swapin{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.inf-run{animation-duration:3s}.thought-label.swap{animation:none}}

/* ===== v3: app is the homepage — centered start screen + smooth transition ===== */
.stage{flex:1;display:flex;flex-direction:column;min-height:0;position:relative}
.main.is-empty .stage{justify-content:center;padding-bottom:8vh}
.main.is-empty .messages{flex:0 0 auto;overflow:visible;padding-bottom:22px}
.main .empty{max-width:760px;margin:0 auto;text-align:center;animation:heroin .5s ease both}
@keyframes heroin{from{opacity:0;transform:translateY(10px)}}
.empty .pill{display:inline-flex;align-items:center;gap:8px;padding:5px 13px;border:1px solid rgba(108,195,245,.3);background:rgba(108,195,245,.08);border-radius:999px;font-size:12.5px;color:#bfe6fb;margin-bottom:18px}
.empty .pill i{width:7px;height:7px;border-radius:50%;background:#4ade80;box-shadow:0 0 10px #4ade80}
.empty h1{font-size:clamp(32px,5vw,52px);line-height:1.05;letter-spacing:-.04em;font-weight:800;margin:0 0 14px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{color:var(--muted);font-size:16px;max-width:520px;margin:0 auto}
.starter{display:none;padding:0 20px}
.main.is-empty .starter{display:block;animation:heroin .5s .08s ease both}
.starter .suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;max-width:760px;margin:16px auto 0}
.starter .sugg{border-radius:999px;padding:8px 15px;font-size:13.5px}
.disclaimer a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.main.is-empty .disclaimer{position:absolute;left:0;right:0;bottom:12px;padding:0 16px}
.composer{position:relative;z-index:2}
.msg{animation:msgin .38s cubic-bezier(.2,.8,.2,1) both}
.messages.instant .msg{animation:none}
@keyframes msgin{from{opacity:0;transform:translateY(10px)}}
/* guest top bar */
.top-links{display:flex;gap:18px;margin-right:6px}
.top-links a{color:var(--muted);font-size:14px;text-decoration:none}
.top-links a:hover{color:var(--text)}
.top-login{font-size:13px;font-weight:500;padding:7px 14px;border:1px solid var(--line);border-radius:9px}
.top-login:hover{background:var(--panel)}
@media (max-width:820px){.top-links{display:none}.main.is-empty .stage{padding-bottom:4vh}.empty h1{font-size:34px}}
@media (max-width:420px){.top-login{display:none}}
@media (prefers-reduced-motion:reduce){.msg,.main .empty,.main.is-empty .starter{animation:none}}

/* loader row vertically centered on the ∞ avatar (30px) */
.msg.assistant .a-body .bubble:has(.waiting){padding-top:0}

/* ===== buy credits ===== */
.btn-buy{width:calc(100% - 12px);margin:10px 6px 0;padding:8px;border-radius:9px;border:1px solid rgba(108,195,245,.45);color:var(--accent);font-size:13px;font-weight:600;background:rgba(108,195,245,.08)}
.btn-buy:hover{background:rgba(108,195,245,.16)}
.buy-modal{width:min(560px,94vw)}
.packs{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:16px 0}
.pack{border:1px solid var(--line);border-radius:14px;padding:16px;background:var(--bg-2);display:flex;flex-direction:column;gap:4px}
.pack.hot{border-color:rgba(108,195,245,.55);background:linear-gradient(180deg,rgba(108,195,245,.1),var(--bg-2))}
.pack-name{font-size:13px;color:var(--muted);font-weight:600}
.pack-price{font-size:26px;font-weight:800;letter-spacing:-.02em}
.pack-credits{font-size:13px;color:#c6d4e6;margin-bottom:10px}
.pack-buy{text-align:center;text-decoration:none;padding:9px;margin-top:auto}
.buy-note{font-size:13px;color:#c6d4e6;background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:10px}
.muted.small{font-size:12px}

/* ===== subscription plans ===== */
.plan-row{display:flex;align-items:center;gap:8px;padding:0 6px 8px}
.plan-badge{font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:3px 9px;border-radius:999px;background:var(--panel-2);color:var(--muted);border:1px solid var(--line)}
.plan-badge.paid{background:var(--grad);color:#04121f;border-color:transparent}
.plan-renew{font-size:12px;color:var(--muted)}
.pack-price small{font-size:13px;color:var(--muted);font-weight:500;margin-left:2px}
.pack-feats{list-style:none;margin:6px 0 14px;padding:0;display:flex;flex-direction:column;gap:6px}
.pack-feats li{font-size:13px;color:#c6d4e6;padding-left:18px;position:relative}
.pack-feats li::before{content:'✓';position:absolute;left:0;color:var(--accent);font-weight:700}
.pack.current{border-color:rgba(74,222,128,.5)}
.pack-buy.disabled{opacity:.55;pointer-events:none;background:var(--panel-2);color:var(--text)}
.buy-reason{background:rgba(108,195,245,.1);border:1px solid rgba(108,195,245,.35);color:#dbeefc;border-radius:10px;padding:10px 12px;font-size:14px;margin:8px 0 4px}

/* ===== free-plan limit hint (Claude-style) ===== */
.limit-strip{max-width:760px;margin:0 auto 8px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 10px 8px 14px;border-radius:12px;background:var(--panel);border:1px solid var(--line);font-size:13.5px;color:#c6d4e6}
.limit-strip.out{border-color:rgba(108,195,245,.45);background:linear-gradient(180deg,rgba(108,195,245,.1),var(--panel))}
.limit-strip button{flex-shrink:0;font-size:13px;font-weight:600;padding:6px 12px;border-radius:8px;background:var(--grad);color:#04121f}

/* ===== login: Google, bot check, forgot password ===== */
.btn-google{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:11px;border-radius:10px;background:#fff;color:#1f1f1f;font-weight:600;font-size:14.5px;border:1px solid #dadce0;transition:background .15s}
.btn-google:hover{background:#f1f3f4}
.btn-google:disabled{opacity:.55;cursor:default}
.or{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12.5px;margin:2px 0}
.or::before,.or::after{content:'';flex:1;height:1px;background:var(--line)}
.consent{display:flex;flex-direction:column;gap:10px}
.link-btn{align-self:flex-end;font-size:12.5px;color:var(--accent);padding:0;margin-top:-6px}
.link-btn:hover{text-decoration:underline}
#backToLogin{align-self:center;margin-top:4px}
.ts-box{display:flex;justify-content:center;min-height:65px}
#forgotForm{display:flex;flex-direction:column;gap:14px}
#forgotForm label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted);font-weight:500}
#forgotForm input{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:11px 13px;outline:none;color:var(--text)}
#forgotMsg.ok{color:#4ade80}
.login-only.hidden{display:none}

/* email confirmed: check animation, fades out by itself */
.confirm-pop{position:fixed;left:50%;top:42%;transform:translate(-50%,-50%);z-index:9999;pointer-events:none;display:flex;flex-direction:column;align-items:center;gap:14px;padding:26px 34px;border-radius:20px;background:var(--panel);border:1px solid var(--line);box-shadow:0 20px 60px rgba(0,0,0,.45);color:var(--text);font-weight:600;font-size:15px;animation:cp-in .35s cubic-bezier(.2,.9,.3,1.2) both}
.confirm-pop svg{width:64px;height:64px}
.confirm-pop .cp-ring{fill:none;stroke:var(--accent);stroke-width:2.5;stroke-dasharray:151;stroke-dashoffset:151;animation:cp-draw .55s ease-out .1s forwards}
.confirm-pop .cp-tick{fill:none;stroke:var(--accent);stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:36;stroke-dashoffset:36;animation:cp-draw .35s ease-out .6s forwards}
.confirm-pop span{opacity:0;animation:cp-fade .3s ease-out .8s forwards}
.confirm-pop.out{animation:cp-out .45s ease-in forwards}
@keyframes cp-in{from{opacity:0;transform:translate(-50%,-50%) scale(.85)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}
@keyframes cp-out{to{opacity:0;transform:translate(-50%,-50%) scale(.95)}}
@keyframes cp-draw{to{stroke-dashoffset:0}}
@keyframes cp-fade{to{opacity:1}}
@media (prefers-reduced-motion:reduce){.confirm-pop,.confirm-pop *{animation-duration:.01s!important;animation-delay:0s!important}}

/* =====================================================================
   v4: night theme — dark sky, Helvetica/Arial, small corners, no glow effects.
   Overrides the rules above; class names are unchanged so app.js keeps working.
   ===================================================================== */
:root{
  --bg:#050913; --bg-2:#050912; --panel:#0C1528; --panel-2:#15213A; --line:#26365A; --line-2:#34476E;
  --text:#E8EDF5; --muted:#A9B4C6; --soft:#C0C9D7; --faint:#98A4B8;
  --accent:#9CCBF5; --accent-2:#3F7CC0; --accent-soft:rgba(156,203,245,.10);
  --danger:#F26B7A; --radius:10px;
  --grad:#FFFFFF; /* old gradient slot: now plain white (buttons) */
  --sans:"Helvetica Neue",Helvetica,Arial,sans-serif;
}
body{font-family:var(--sans);background:var(--bg)}
.grad{background:none;-webkit-background-clip:border-box;background-clip:border-box;color:inherit}

/* brand */
.brand{font-weight:700;color:#fff}
.brand b{background:none;color:inherit;font-weight:700}
.brand img{width:34px}

/* buttons */
.btn-primary{background:#fff;color:#08101F;border-radius:6px;font-weight:600}
.btn-primary:hover{filter:none;background:#DDE6F2}
.btn-ghost{border-radius:6px;border-color:var(--line-2);color:var(--text)}
.btn-ghost:hover{background:var(--panel)}
.btn-danger{border-radius:6px}
.icon-btn{border-radius:6px}
.top-cta{background:#fff;color:#08101F;border-radius:6px}
.top-login{border-radius:6px;border-color:var(--line-2)}

/* sidebar */
.sidebar{background:var(--bg-2);border-right:1px solid var(--line);padding:14px 10px}
.side-top{padding:4px 8px 16px}
.side-item{display:flex;align-items:center;gap:10px;width:100%;padding:9px 10px;border-radius:6px;font-size:14px;color:#E1E7F0;text-align:left}
.side-item:hover,.side-item[aria-expanded="true"]{background:#0D1527}
.side-item svg{width:17px;height:17px;flex-shrink:0;color:var(--soft)}
.chat-search{padding:6px 2px 2px}
.chat-search input{width:100%;background:var(--panel);border:1px solid var(--line-2);border-radius:6px;padding:8px 10px;font-size:13.5px;color:var(--text);outline:none}
.chat-search input:focus{border-color:var(--accent-2)}
.chat-search input::placeholder{color:var(--faint)}
.chat-list-label{text-transform:none;letter-spacing:0;font-size:12px;font-weight:600;color:var(--faint);padding:20px 10px 6px}
.chat-item{border-radius:6px;color:#D5DCE7}
.chat-item:hover{background:#0D1527}
.chat-item.active{background:var(--panel-2);color:#fff}
.empty-list{color:var(--faint);line-height:1.45}
.side-bottom{border-top:1px solid var(--line)}
.guest-title{color:#fff}
.guest-sub{color:var(--faint)}
.btn-buy{border-radius:6px;border-color:var(--line-2);background:none;color:var(--accent)}
.btn-buy:hover{background:var(--accent-soft)}
.bar i{background:var(--accent)}
.avatar{background:var(--panel-2);color:#fff;border:1px solid var(--line-2)}
.plan-badge{border-radius:4px;letter-spacing:.02em;text-transform:none;font-size:12px}
.plan-badge.paid{background:var(--accent);color:#08101F}

/* main area: night sky with a faint blue light from the bottom */
.main{background:
  radial-gradient(ellipse 75% 50% at 50% 118%,rgba(156,203,245,.22),transparent 72%),
  linear-gradient(180deg,#050913 0%,#071026 55%,#0B1633 100%)}
.topbar{border-bottom:0}
.chat-title{color:var(--soft)}
.top-links a{color:var(--accent)}
.top-links a:hover{color:#C4E0F8}

/* start screen */
.main .empty{max-width:760px}
.empty h1{font-family:var(--sans);font-weight:400;font-size:clamp(28px,3.4vw,40px);line-height:1.15;letter-spacing:-.015em;color:#fff;margin:0 0 12px}
.hero-sub{color:var(--soft);font-size:16px}
.starter{text-align:center}
.store-note{margin:14px auto 0;font-size:12.5px;color:var(--faint)}
.disclaimer{color:var(--faint)}
.main .disclaimer a{color:var(--soft);text-decoration:none}
.disclaimer a:hover{color:var(--accent)}

/* composer */
.composer-box,.cmp{border-radius:12px;background:var(--panel);border-color:var(--line-2)}
.composer-box:focus-within{border-color:#44608F;box-shadow:none}
.cmp-field{position:relative}
.cmp-ph{position:absolute;left:4px;top:6px;line-height:1.5;color:var(--faint);pointer-events:none;white-space:nowrap;overflow:hidden;max-width:100%}
.cmp-ph em{font-style:italic}
.cmp-filled .cmp-ph,.cmp-locked .cmp-ph{display:none}
.cmp-input::placeholder{color:var(--faint)}
.cmp .cmp-tools .cmp-btn{border:1px solid transparent;border-radius:6px;color:var(--soft)}
.cmp .cmp-tools .cmp-btn:hover{background:none;border-color:var(--line-2);color:#fff}
.cmp .cmp-tools .cmp-toggle.on{background:#0E1D36;border-color:#27466F;color:var(--accent)}
.cmp-send,.cmp .cmp-send{width:36px;height:36px;border-radius:6px;background:#fff;color:#08101F}
.cmp .cmp-send:disabled{opacity:1;background:#2A3857;color:#9AA7BE}
.cmp .cmp-send.is-stop,.cmp-send.is-stop{background:var(--soft)}
.cmp.drag{border-color:var(--accent-2);box-shadow:none}
.cmp-att{border-radius:6px}

/* messages */
.msg.user .bubble{background:var(--panel-2);border-color:var(--line);border-radius:10px}
.msg.assistant .who{border-radius:6px;background:var(--panel);border-color:var(--line)}
.bubble{color:#DCE3EE}
.bubble code{border-radius:4px}
.bubble pre{border-radius:8px;background:#040811}
.copy-btn{border-radius:4px}
.act{border-radius:6px;color:var(--muted)}
.sources a{border-radius:6px}
.sources a b{border-radius:4px}
.sources-label{text-transform:none;letter-spacing:0;font-size:12px}
.thought{border-left-color:var(--line-2)}
.thought-text{color:#A9B4C6}
.inf-run{filter:none}
.wall{border-radius:10px;border-color:var(--line-2);background:var(--panel)}
.limit-strip{border-radius:8px}
.limit-strip.out{background:var(--panel);border-color:#27466F}
.limit-strip button{background:#fff;color:#08101F;border-radius:6px}

/* overlays and dialogs */
.auth-glow{display:none}
.auth.overlay{background:rgba(3,6,13,.9);backdrop-filter:none}
.auth-card{background:var(--panel);backdrop-filter:none;border-radius:12px;border-color:var(--line-2)}
.tabs{border-radius:8px;background:var(--bg-2)}
.tab{border-radius:6px}
#authForm input[type=email],#authForm input[type=password],#authForm input[type=text],.modal input,#forgotForm input{border-radius:6px;background:var(--bg-2);border-color:var(--line-2)}
.btn-google{border-radius:6px}
.modal,.agegate{border-radius:12px;border-color:var(--line-2)}
.modal::backdrop,.agegate::backdrop{backdrop-filter:none;background:rgba(3,6,13,.75)}
.pack{border-radius:8px}
.pack.hot{background:var(--bg-2);border-color:#27466F}
.buy-note,.buy-reason{border-radius:6px}
.confirm-pop{border-radius:12px;box-shadow:none;border-color:var(--line-2)}

/* ===== v4: no avatar next to answers + ∞ loader (two dots that draw the logo) ===== */
.msg.assistant{gap:0}
.msg.assistant .who{display:none}
.orb{width:30px;height:14px;display:block;flex-shrink:0;overflow:visible}
.orb path{fill:none;stroke-width:6;stroke-linecap:round;stroke-linejoin:round}
.orb-track{stroke:rgba(156,203,245,.14)}
.orb-draw{stroke:var(--accent);stroke-dasharray:100;stroke-dashoffset:100;animation:orb-draw 3.2s linear infinite}
.orb-dot{fill:var(--accent);animation:orb-dot 3.2s ease-in-out infinite}
@keyframes orb-draw{0%{stroke-dashoffset:100;opacity:1}50%{stroke-dashoffset:0;opacity:1}75%{stroke-dashoffset:0;opacity:1}100%{stroke-dashoffset:0;opacity:0}}
@keyframes orb-dot{0%,45%{opacity:1}55%,80%{opacity:0}100%{opacity:1}}
.waiting{display:flex;align-items:center;gap:10px;height:28px;color:var(--soft);font-size:14px}
.thought-icon{display:inline-flex;align-items:center}
.thought-icon:empty{display:none}
@media (prefers-reduced-motion:reduce){.orb-dot{display:none}.orb-draw{animation:none;stroke-dashoffset:0}}

/* ===== v4: slim grey scrollbars instead of the white browser default ===== */
:root{color-scheme:dark}
*{scrollbar-width:thin;scrollbar-color:#2E3C5C transparent}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#2E3C5C;border-radius:4px;border:2px solid transparent;background-clip:padding-box}
::-webkit-scrollbar-thumb:hover{background:#43557D;background-clip:padding-box}
::-webkit-scrollbar-button{display:none;width:0;height:0}
::-webkit-scrollbar-corner{background:transparent}

/* (literally) - small aside next to the headline */
.lit{font-size:.4em;font-style:italic;font-weight:400;letter-spacing:0;color:var(--soft,#8a94a6);opacity:.75;margin-left:.15em;white-space:nowrap}


/* (literally) - small aside next to the headline */
.lit{font-size:.4em;font-style:italic;font-weight:400;letter-spacing:0;color:var(--soft,#8a94a6);opacity:.75;margin-left:.15em;white-space:nowrap}


/*think-words*/
.thought.no-steps summary{cursor:default;pointer-events:none}
.thought.no-steps summary::after{display:none}

/* aa-mobile: phone polish */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
.messages,.bubble,.a-body{min-width:0;max-width:100%}
.bubble{overflow-wrap:anywhere;word-break:break-word}
.bubble pre{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.bubble pre code{overflow-wrap:normal;word-break:normal}
.bubble table{display:block;max-width:100%;overflow-x:auto}
.bubble img{max-width:100%;height:auto}
.store-note{display:none}
@media (max-width:820px){
  textarea,input,select{font-size:16px!important}
  .composer{padding-bottom:calc(10px + env(safe-area-inset-bottom))}
  .disclaimer{font-size:11.5px;padding:0 14px 6px;text-align:center;line-height:1.5}
  .user-col{max-width:88%}
  .bubble pre{font-size:12.5px}
  dialog{max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px);overflow-y:auto}
}

/* aa-footer: legal links at the bottom of the sidebar */
.side-legal{padding:10px 14px 12px;font-size:11.5px;color:var(--faint,#98A4B8);text-align:center}
.side-legal a{color:inherit;text-decoration:none}
.side-legal a:hover{color:var(--text,#E8EDF5);text-decoration:underline}

/* aa-actions: icon actions under answers */
.msg-actions{align-items:center}
.act-icon{display:inline-grid;place-items:center;width:30px;height:30px;padding:0}
.act-icon svg{display:block}
.act-more{position:relative;display:inline-block}
.act-menu{position:absolute;top:34px;left:0;z-index:30;min-width:220px;padding:4px;border-radius:10px;border:1px solid var(--line);background:var(--panel,#0c1322);box-shadow:0 10px 30px rgba(0,0,0,.45)}
.act-menu-item{display:block;width:100%;text-align:left;padding:9px 11px;border-radius:7px;font-size:13.5px;color:var(--text);background:none;border:0;cursor:pointer}
.act-menu-item:hover,.act-menu-item:focus-visible{background:rgba(255,255,255,.06)}

/* aa-math */
.bubble .katex { font-size: 1.08em; }
.bubble .math-block { display: block; overflow-x: auto; overflow-y: hidden; margin: .7em 0; padding: 2px 0; }
.bubble .math-block .katex-display { margin: 0; }

/* aa-seo: keyword landing pages - chat on top, text for Google below */
body[data-landing] .main.is-empty .stage{overflow-y:auto;justify-content:flex-start;padding-top:max(14vh,40px)}
body[data-landing] .main.is-empty .disclaimer{display:none}
.seo-land{max-width:720px;margin:22vh auto 60px;text-align:left;color:var(--muted);font-size:15px;line-height:1.7}
.seo-land h2{color:var(--text);font-size:22px;line-height:1.3;margin:0 0 12px}
.seo-land h3{color:var(--text);font-size:17px;margin:28px 0 8px}
.seo-land ul{padding-left:20px;margin:8px 0}
.seo-land li{margin:4px 0}
.seo-land strong{color:var(--text);font-weight:600}
.seo-land details{border-top:1px solid var(--line);padding:10px 0}
.seo-land summary{cursor:pointer;color:var(--text);font-weight:500}
.seo-land details p{margin:8px 0 0}
.seo-land a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.seo-more{margin-top:28px;font-size:13px}
@media (max-width:820px){body[data-landing] .main.is-empty .stage{padding-top:6vh}.seo-land{margin-top:14vh}}

/* aa-welcome: welcome discount in the plan dialog */
.pack.welcome{border-color:rgba(245,184,75,.55)}
.pack-welcome{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 10px;font-size:12.5px;color:#f5b84b;margin:2px 0 4px}
.pack-welcome b{font-weight:700}
.pack-welcome [data-welcome-left]{font-variant-numeric:tabular-nums}
.pack-old{font-size:15px;font-weight:500;color:var(--muted);margin-right:8px;vertical-align:middle}

/* aa-steps: steps list + source cards */
.thought-text:empty{display:none}
.steps{list-style:none;margin:6px 0 4px;padding:0;display:flex;flex-direction:column;gap:1px}
.steps:empty{display:none}
.step{display:flex;align-items:flex-start;gap:9px;padding:3px 0;font-size:13.5px;line-height:1.45;color:var(--faint,#98A4B8)}
.step-ico{width:16px;height:20px;flex-shrink:0;display:grid;place-items:center;color:var(--faint,#98A4B8)}
.step-body{display:flex;flex-direction:column;gap:5px;min-width:0}
.step-text{overflow:hidden;text-overflow:ellipsis}
.step.active{color:var(--text)}
.step.active .step-ico{color:var(--accent);animation:steppulse 1.4s ease-in-out infinite}
.step.fresh{animation:swapin .35s ease}
@keyframes steppulse{50%{opacity:.4}}
.step-hosts{display:flex;gap:4px;flex-wrap:wrap}
.src-ico{width:16px;height:16px;border-radius:4px;flex-shrink:0;display:inline-grid;place-items:center;overflow:hidden;background:var(--panel-2);color:var(--accent);font-size:9.5px;font-weight:700;line-height:1}
.src-ico img{width:16px;height:16px;display:block}
.sources{margin-top:14px}
.sources-label{font-size:12px;color:var(--muted);margin-bottom:8px;text-transform:none;letter-spacing:0}
.src-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(168px,1fr));gap:8px}
.sources .src-card{display:flex;flex-direction:column;align-items:stretch;gap:6px;min-width:0;max-width:none;margin:0;padding:9px 11px 10px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--text);font:inherit;font-size:13px;text-decoration:none;text-align:left;cursor:pointer;transition:border-color .15s,background .15s}
.sources .src-card:hover{border-color:var(--line-2,#34476E);background:var(--panel-2)}
.src-head{display:flex;align-items:center;gap:6px;min-width:0;font-size:12px;color:var(--muted)}
.src-host{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.src-num{margin-left:auto;padding-left:6px;font-size:11px;color:var(--faint,#98A4B8);font-variant-numeric:tabular-nums}
.sources .src-card .src-title{font-size:13px;line-height:1.35;color:#d5deea;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.sources .src-more{justify-content:center}
.src-more-icons{display:flex;gap:3px}
@media (max-width:560px){.src-cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (prefers-reduced-motion:reduce){.step.active .step-ico,.step.fresh{animation:none}}

/* aa-steps2: compact sources button, cards open on click */
.src-toggle{display:inline-flex;align-items:center;gap:8px;padding:5px 11px 5px 6px;border:1px solid var(--line);border-radius:999px;background:var(--panel);color:var(--muted);font:inherit;font-size:12.5px;line-height:1;cursor:pointer;transition:border-color .15s,background .15s,color .15s}
.src-toggle:hover,.src-toggle.open{border-color:var(--line-2,#34476E);color:var(--text)}
.src-stack{display:inline-flex;align-items:center}
.src-stack .src-ico{width:18px;height:18px;margin-left:-6px;border-radius:50%;box-shadow:0 0 0 2px var(--panel)}
.src-stack .src-ico:first-child{margin-left:0}
.src-stack .src-ico img{width:18px;height:18px;border-radius:50%}
.src-count{color:var(--faint,#98A4B8);font-variant-numeric:tabular-nums}
.src-chev{font-size:15px;transition:transform .15s}
.src-toggle.open .src-chev{transform:rotate(90deg)}
.sources .src-cards{margin-top:10px}
@media (prefers-reduced-motion:reduce){.src-chev{transition:none}}

/* aa-sources: citation links inside answers */
.bubble a.cite{display:inline-grid;place-items:center;min-width:17px;height:17px;padding:0 4px;margin:0 1px 0 3px;border-radius:5px;background:var(--panel-2);border:1px solid var(--line);color:var(--muted);font-size:10.5px;font-weight:600;line-height:1;text-decoration:none;vertical-align:2px;transition:background .15s,color .15s}
.bubble a.cite:hover{background:var(--accent-soft);color:var(--text);border-color:var(--line-2,#34476E)}

/* aa-authmobile: login window on phones — scrollable, never wider than the screen */
.auth.overlay{display:flex;align-items:flex-start;justify-content:center;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}
.auth.overlay .auth-card{margin:auto 0;flex-shrink:0;max-width:min(400px,100%)}
.ts-box{max-width:100%;display:flex;justify-content:center}
@media (max-width:480px){
  .auth.overlay{padding:12px}
  .auth-card{padding:30px 16px 18px}
  .auth-close{top:8px;right:8px}
  #authForm input[type=email],#authForm input[type=password],#authForm input[type=text],#forgotForm input,.modal input{font-size:16px}
}
@media (max-width:340px){.ts-box{transform:scale(.9);transform-origin:center top}}