:root{
  --accent:#6C5CE7; --accent-2:#8B7CF0; --bg:#ffffff; --bg-soft:#f6f6f8; --bg-elev:#ffffff;
  --text:#17171c; --text-soft:#5c5c66; --text-faint:#9a9aa5; --line:#e7e7ec; --line-soft:#efeff3;
  --bubble-user:#17171c; --bubble-user-text:#fff; --bubble-ai:#f3f3f6; --danger:#d64545; --ok:#1f9d66;
  --radius:18px; --radius-sm:12px; --sidebar-w:300px; --shadow:0 12px 40px rgba(20,16,60,.14);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
[data-theme="dark"]{
  --bg:#101014; --bg-soft:#17171d; --bg-elev:#1c1c23; --text:#f2f2f5; --text-soft:#a8a8b3; --text-faint:#6e6e7a;
  --line:#282832; --line-soft:#22222b; --bubble-user:#f2f2f5; --bubble-user-text:#17171c; --bubble-ai:#1e1e26;
  --shadow:0 12px 40px rgba(0,0,0,.5);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]):not([data-theme="dark"]){
    --bg:#101014; --bg-soft:#17171d; --bg-elev:#1c1c23; --text:#f2f2f5; --text-soft:#a8a8b3; --text-faint:#6e6e7a;
    --line:#282832; --line-soft:#22222b; --bubble-user:#f2f2f5; --bubble-user-text:#17171c; --bubble-ai:#1e1e26;
    --shadow:0 12px 40px rgba(0,0,0,.5);
  }
}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;overflow:hidden}
button{font-family:inherit;cursor:pointer} input,textarea{font-family:inherit}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
.hidden{display:none!important}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;border:1px solid transparent;background:transparent;color:var(--text-soft);flex:none;transition:.15s}
.icon-btn:hover{background:var(--bg-soft);color:var(--text)}
.icon-btn svg{width:20px;height:20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;border:1px solid var(--line);background:var(--bg-elev);color:var(--text);padding:10px 18px;font-size:14px;font-weight:600;transition:.15s}
.btn:hover{border-color:var(--text-faint)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-2)}
.btn.danger{background:var(--danger);border-color:var(--danger);color:#fff}
.btn.block{width:100%} .btn:disabled{opacity:.55;cursor:default}
.field{margin-bottom:14px} .field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text-soft)}
.field input,.field textarea{width:100%;border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;font-size:15px;background:var(--bg);color:var(--text);outline:none}
.field input:focus,.field textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 18%,transparent)}
.form-error{background:#fdf0f0;color:#a12c2c;border:1px solid #f3caca;border-radius:var(--radius-sm);padding:10px 12px;font-size:13.5px;margin-bottom:14px;line-height:1.45}
[data-theme="dark"] .form-error{background:#2a1518;color:#f0a3a3;border-color:#4a2226}

/* ---------- Auth ---------- */
#authView{min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(900px 500px at 70% -10%,color-mix(in srgb,var(--accent) 16%,transparent),transparent 60%),var(--bg)}
.auth-card{width:100%;max-width:400px}
.brand-mark{display:flex;flex-direction:column;align-items:center;text-align:center;margin-bottom:28px}
.brand-orb{width:64px;height:64px;border-radius:20px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:flex;align-items:center;justify-content:center;color:#fff;font-size:32px;font-weight:800;letter-spacing:-1px;box-shadow:0 10px 30px color-mix(in srgb,var(--accent) 35%,transparent)}
.brand-mark h1{font-size:30px;margin:16px 0 4px;letter-spacing:-.5px}
.brand-mark p{margin:0;color:var(--text-soft);font-size:15px}
.auth-tabs{display:flex;background:var(--bg-soft);border-radius:999px;padding:4px;margin-bottom:22px}
.auth-tabs button{flex:1;border:0;background:transparent;padding:9px;border-radius:999px;font-size:14px;font-weight:600;color:var(--text-soft)}
.auth-tabs button.active{background:var(--bg-elev);color:var(--text);box-shadow:0 2px 8px rgba(0,0,0,.08)}
.auth-foot{text-align:center;color:var(--text-faint);font-size:12.5px;margin-top:18px;line-height:1.5}

/* ---------- App shell ---------- */
#appView{display:flex;height:100dvh}
#sidebar{width:var(--sidebar-w);flex:none;background:var(--bg-soft);border-right:1px solid var(--line-soft);display:flex;flex-direction:column;min-height:0}
.side-head{padding:14px 14px 8px;display:flex;align-items:center;gap:10px}
.side-logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:17px;letter-spacing:-.3px}
.side-logo .brand-orb{width:32px;height:32px;border-radius:10px;font-size:17px;box-shadow:none}
.side-head .spacer{flex:1}
.new-chat{margin:6px 14px 10px;display:flex;align-items:center;gap:9px;width:calc(100% - 28px);border:1px solid var(--line);background:var(--bg-elev);border-radius:12px;padding:11px 13px;font-size:14px;font-weight:600;color:var(--text)}
.new-chat:hover{border-color:var(--accent);color:var(--accent)}
.search-wrap{padding:0 14px 10px}
.search-wrap input{width:100%;border:1px solid var(--line-soft);background:var(--bg-elev);border-radius:10px;padding:9px 12px;font-size:13.5px;color:var(--text);outline:none}
.search-wrap input:focus{border-color:var(--accent)}
#convList{flex:1;overflow-y:auto;padding:2px 8px 10px;min-height:0}
.conv-item{display:flex;align-items:center;gap:6px;padding:10px 10px;border-radius:10px;cursor:pointer;color:var(--text)}
.conv-item:hover{background:color-mix(in srgb,var(--text) 5%,transparent)}
.conv-item.active{background:color-mix(in srgb,var(--accent) 12%,transparent)}
.conv-item .t{flex:1;min-width:0;font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-item .meta{font-size:11px;color:var(--text-faint)}
.conv-item .icon-btn{width:28px;height:28px;opacity:0} .conv-item:hover .icon-btn,.conv-item.active .icon-btn{opacity:1}
.conv-item .icon-btn svg{width:15px;height:15px}
.conv-empty{padding:18px 12px;color:var(--text-faint);font-size:13.5px;text-align:center;line-height:1.5}
.side-foot{border-top:1px solid var(--line-soft);padding:10px 8px}
.side-nav{display:flex;flex-direction:column;gap:2px}
.side-nav button{display:flex;align-items:center;gap:10px;border:0;background:transparent;padding:10px 10px;border-radius:10px;font-size:14px;font-weight:500;color:var(--text);text-align:left}
.side-nav button:hover{background:color-mix(in srgb,var(--text) 5%,transparent)}
.side-nav button svg{width:19px;height:19px;color:var(--text-soft)}
.user-chip{display:flex;align-items:center;gap:10px;padding:10px 10px 2px}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex:none}
.user-chip .n{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-chip .p{font-size:12px;color:var(--text-faint);text-transform:capitalize}

#main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}
.topbar{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--line-soft);min-height:58px}
.topbar .title{font-size:15px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar .spacer{flex:1}
#menuBtn{display:none}
#demoBanner{margin:12px 16px 0;background:#fff8e6;border:1px solid #f0dfa8;color:#7a5c00;border-radius:12px;padding:10px 14px;font-size:13.5px;line-height:1.5}
[data-theme="dark"] #demoBanner{background:#2a2410;color:#ecd28a;border-color:#4d421c}
#demoBanner b{text-transform:uppercase;font-size:11px;letter-spacing:.06em;display:block;margin-bottom:2px}

/* ---------- Chat ---------- */
#chatScroll{flex:1;overflow-y:auto;min-height:0}
.chat-inner{max-width:780px;margin:0 auto;padding:24px 20px 12px;display:flex;flex-direction:column;gap:20px}
.empty-state{padding:8vh 8px 0;text-align:center}
.empty-state h2{font-size:clamp(24px,4vw,32px);letter-spacing:-.5px;margin:0 0 8px;font-weight:800}
.empty-state p{color:var(--text-soft);margin:0 0 26px;font-size:15px}
.starters{display:grid;grid-template-columns:1fr 1fr;gap:10px;max-width:560px;margin:0 auto;text-align:left}
.starter{border:1px solid var(--line);background:var(--bg-elev);border-radius:14px;padding:14px;font-size:14px;font-weight:500;color:var(--text);text-align:left;line-height:1.4}
.starter:hover{border-color:var(--accent);color:var(--accent)}
.msg{display:flex;gap:12px;max-width:100%}
.msg .avatar{margin-top:2px}
.msg.user{justify-content:flex-end}
.bubble{max-width:min(680px,86%);border-radius:var(--radius);padding:12px 16px;font-size:15px;line-height:1.65;overflow-wrap:anywhere}
.msg.user .bubble{background:var(--bubble-user);color:var(--bubble-user-text);border-bottom-right-radius:6px}
.msg.assistant .bubble{background:var(--bubble-ai);border-bottom-left-radius:6px}
.bubble p{margin:0 0 10px}.bubble p:last-child{margin-bottom:0}
.bubble ul,.bubble ol{margin:4px 0 10px;padding-left:20px}.bubble li{margin:3px 0}
.bubble code{font-family:var(--mono);font-size:13px;background:color-mix(in srgb,var(--text) 8%,transparent);padding:1px 5px;border-radius:5px}
.bubble pre{position:relative;background:#121218;color:#e8e8f0;border-radius:12px;padding:14px;overflow-x:auto;margin:8px 0}
.bubble pre code{background:transparent;padding:0;color:inherit;font-size:13px;line-height:1.55}
.code-copy{position:absolute;top:8px;right:8px;border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.08);color:#fff;border-radius:8px;padding:4px 9px;font-size:12px;font-weight:600}
.msg-actions{display:flex;gap:2px;margin-top:4px}
.msg-actions .icon-btn{width:30px;height:30px}.msg-actions .icon-btn svg{width:15px;height:15px}
.msg-col{display:flex;flex-direction:column}
.img-marker{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;opacity:.75;margin-top:8px}
.img-marker svg{width:15px;height:15px}
.typing{display:inline-flex;gap:5px;padding:4px 2px}
.typing span{width:7px;height:7px;border-radius:50%;background:var(--text-faint);animation:tp 1.2s infinite}
.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}
@keyframes tp{0%,60%,100%{transform:translateY(0);opacity:.5}30%{transform:translateY(-4px);opacity:1}}
.stream-caret{display:inline-block;width:8px;height:16px;background:var(--accent);border-radius:2px;vertical-align:-2px;margin-left:2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.chat-error{max-width:780px;margin:6px auto 0;width:calc(100% - 40px);background:#fdf0f0;border:1px solid #f3caca;color:#8f2727;border-radius:12px;padding:11px 14px;font-size:13.5px;line-height:1.5}
[data-theme="dark"] .chat-error{background:#2a1518;border-color:#4a2226;color:#f0a3a3}

/* ---------- Composer ---------- */
.composer-wrap{padding:10px 16px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--bg) 30%)}
.composer{max-width:780px;margin:0 auto;border:1px solid var(--line);border-radius:22px;background:var(--bg-elev);box-shadow:0 4px 24px rgba(0,0,0,.05);padding:8px}
.composer:focus-within{border-color:var(--text-faint)}
#attachChip{display:flex;align-items:center;gap:10px;background:var(--bg-soft);border-radius:12px;padding:8px 10px;margin-bottom:6px}
#attachChip img{width:40px;height:40px;border-radius:8px;object-fit:cover}
#attachChip .n{font-size:13px;font-weight:600;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#composerInput{width:100%;border:0;outline:none;resize:none;background:transparent;color:var(--text);font-size:15.5px;line-height:1.5;padding:8px 8px 4px;max-height:180px}
.composer-row{display:flex;align-items:center;gap:4px;padding-top:2px}
.composer-row .spacer{flex:1}
.send-btn{width:38px;height:38px;border-radius:50%;border:0;background:var(--accent);color:#fff;display:inline-flex;align-items:center;justify-content:center;flex:none;transition:.15s}
.send-btn:hover{background:var(--accent-2)} .send-btn:disabled{background:var(--bg-soft);color:var(--text-faint);cursor:default}
.send-btn svg{width:18px;height:18px}
.send-btn.stop{background:var(--text);color:var(--bg)}
.mic-live{color:#fff!important;background:var(--danger)!important;border-color:var(--danger)!important;animation:pulse 1.2s infinite}
@keyframes pulse{50%{opacity:.65}}
.composer-hint{text-align:center;font-size:12px;color:var(--text-faint);margin-top:9px}

/* ---------- Views (memory / settings) ---------- */
.page{flex:1;overflow-y:auto;min-height:0}
.page-inner{max-width:720px;margin:0 auto;padding:28px 20px 40px}
.page-inner h2{font-size:24px;letter-spacing:-.4px;margin:0 0 6px}
.page-sub{color:var(--text-soft);font-size:14.5px;line-height:1.6;margin:0 0 24px}
.card{background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:16px}
.card h3{margin:0 0 4px;font-size:16px}.card p{margin:0;color:var(--text-soft);font-size:14px;line-height:1.55}
.mem-item{display:flex;gap:10px;align-items:flex-start;padding:13px 14px;border:1px solid var(--line);border-radius:14px;margin-bottom:10px;background:var(--bg-elev)}
.mem-item .txt{flex:1;font-size:14.5px;line-height:1.55;min-width:0}
.mem-item .when{font-size:11.5px;color:var(--text-faint);margin-top:3px}
.mem-item textarea{flex:1;border:1px solid var(--accent);border-radius:10px;padding:9px 11px;font-size:14.5px;background:var(--bg);color:var(--text);resize:vertical;min-height:56px;outline:none}
.mem-item .icon-btn{width:32px;height:32px}.mem-item .icon-btn svg{width:16px;height:16px}
.add-row{display:flex;gap:8px}
.add-row input{flex:1;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14.5px;background:var(--bg);color:var(--text);outline:none}
.add-row input:focus{border-color:var(--accent)}
.setting-row{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line-soft)}
.setting-row:last-child{border-bottom:0}
.setting-row .grow{flex:1}.setting-row .grow b{font-size:14.5px;display:block}
.setting-row .grow span{font-size:13px;color:var(--text-soft)}
.seg{display:flex;background:var(--bg-soft);border-radius:999px;padding:3px}
.seg button{border:0;background:transparent;padding:7px 13px;border-radius:999px;font-size:13px;font-weight:600;color:var(--text-soft)}
.seg button.active{background:var(--bg-elev);color:var(--text);box-shadow:0 1px 5px rgba(0,0,0,.1)}
.switch{position:relative;width:46px;height:27px;flex:none}
.switch input{opacity:0;width:100%;height:100%;position:absolute;margin:0;cursor:pointer;z-index:1}
.switch .track{position:absolute;inset:0;background:var(--line);border-radius:999px;transition:.15s}
.switch .track::after{content:"";position:absolute;top:3px;left:3px;width:21px;height:21px;border-radius:50%;background:#fff;transition:.15s;box-shadow:0 1px 4px rgba(0,0,0,.25)}
.switch input:checked + .track{background:var(--accent)} .switch input:checked + .track::after{left:22px}
.plan-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.plan-card{border:1px solid var(--line);border-radius:14px;padding:16px}
.plan-card.current{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 6%,transparent)}
.plan-card h4{margin:0 0 4px;font-size:15px}.plan-card p{font-size:13px}
.badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;background:var(--accent);color:#fff;border-radius:999px;padding:2px 8px;margin-left:6px;vertical-align:2px}

/* ---------- Overlays ---------- */
#scrim{position:fixed;inset:0;background:rgba(10,10,16,.45);z-index:40;opacity:0;pointer-events:none;transition:.2s}
#scrim.show{opacity:1;pointer-events:auto}
.modal{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:20px;pointer-events:none}
.modal .sheet{background:var(--bg-elev);border-radius:20px;box-shadow:var(--shadow);width:100%;max-width:400px;padding:22px;transform:translateY(8px) scale(.98);opacity:0;transition:.18s;pointer-events:none}
.modal.show .sheet{transform:none;opacity:1;pointer-events:auto}
.modal h3{margin:0 0 8px;font-size:17px}.modal p{margin:0 0 18px;color:var(--text-soft);font-size:14px;line-height:1.55}
.modal .row{display:flex;gap:8px;justify-content:flex-end}
#toast{position:fixed;left:50%;bottom:calc(22px + env(safe-area-inset-bottom));transform:translate(-50%,16px);z-index:60;background:#17171c;color:#f5f5f8;border-radius:999px;padding:11px 12px 11px 18px;display:flex;align-items:center;gap:14px;font-size:14px;font-weight:500;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.2s;max-width:calc(100vw - 32px)}
#toast.show{opacity:1;transform:translate(-50%,0);pointer-events:auto}
#toast button{border:0;background:transparent;color:var(--accent-2);font-weight:700;font-size:14px;padding:4px 8px}
#installBar{position:fixed;left:50%;bottom:calc(76px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:30;background:var(--bg-elev);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:12px 14px;display:flex;align-items:center;gap:12px;max-width:calc(100vw - 32px)}
#installBar .t{font-size:13.5px;font-weight:600;line-height:1.35}
#installBar .t span{display:block;font-weight:400;color:var(--text-soft);font-size:12.5px}
#scrimSide{display:none}

@media (max-width:820px){
  #sidebar{position:fixed;inset:0 auto 0 0;z-index:45;transform:translateX(-105%);transition:transform .22s ease;box-shadow:var(--shadow);width:min(84vw,320px)}
  #sidebar.open{transform:none}
  #menuBtn{display:inline-flex}
  #scrimSide{display:block;position:fixed;inset:0;background:rgba(10,10,16,.45);z-index:44;opacity:0;pointer-events:none;transition:.2s}
  #scrimSide.show{opacity:1;pointer-events:auto}
  .starters{grid-template-columns:1fr}
  .plan-grid{grid-template-columns:1fr}
  .bubble{max-width:92%}
}