*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--budian-bg);color:var(--budian-text-primary);font:15px/1.55 var(--budian-font-sans)}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}:focus-visible{outline:3px solid var(--budian-ring);outline-offset:3px}.skip{position:fixed;left:12px;top:-80px;z-index:1000;padding:12px;background:var(--budian-text-primary);color:var(--budian-bg)}.skip:focus{top:12px}.app{display:grid;grid-template-columns:252px minmax(0,1fr);height:100dvh;min-height:420px}.sidebar{background:var(--budian-bg-inset);border-right:1px solid var(--budian-border);padding:22px 14px 16px;display:flex;flex-direction:column;min-width:0}.side-head{display:flex;justify-content:space-between;align-items:center;padding:0 8px 27px}.brand{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:760;letter-spacing:-.035em}.brand small{display:block;font:10px var(--budian-font-mono);letter-spacing:.11em;color:var(--budian-text-muted);margin-top:2px}.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--budian-text-primary);color:var(--budian-bg);border-radius:12px;font-size:17px}.icon{border:0;background:transparent;color:var(--budian-text-secondary);width:44px;height:44px;display:grid;place-items:center;border-radius:11px}.icon:hover,.tool-button:hover{background:color-mix(in srgb,var(--budian-text-primary) 6%,transparent)}.side-close,.mobile-menu{display:none}.new-chat{display:flex;align-items:center;gap:10px;width:100%;min-height:47px;padding:0 15px;border-radius:13px;border:1px solid var(--budian-border);background:var(--budian-surface-strong);color:var(--budian-text-primary);font-weight:670;text-align:left}.new-chat span:first-child{font-size:23px;line-height:1;font-weight:400}.new-chat:hover{border-color:var(--budian-accent)}.side-label,.eyebrow{font:700 11px var(--budian-font-mono);letter-spacing:.14em;color:var(--budian-text-muted);text-transform:uppercase}.side-label{margin:34px 13px 11px}.threads{display:flex;flex-direction:column;gap:4px;overflow:auto;min-height:0}.thread{display:block;text-align:left;width:100%;min-height:44px;padding:10px 13px;border:0;border-radius:11px;color:var(--budian-text-secondary);background:transparent;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}.thread:hover,.thread.active{background:var(--budian-surface-strong);color:var(--budian-text-primary)}.side-bottom{margin-top:auto;border-top:1px solid var(--budian-border);padding:15px 4px 0;display:flex;align-items:center;gap:9px;color:var(--budian-text-secondary);font-size:13px}.side-bottom .settings-trigger{margin-left:auto}.model-dot{width:7px;height:7px;border-radius:50%;background:var(--budian-accent)}.main{display:flex;flex-direction:column;min-width:0;min-height:0}.chat-top{height:77px;border-bottom:1px solid var(--budian-border);padding:0 32px;display:flex;align-items:center;justify-content:space-between;flex:none}.top-left,.top-actions{display:flex;align-items:center;gap:16px}.top-left strong{display:block;font-size:16px;line-height:1.3}.top-sub{font:10px var(--budian-font-mono);letter-spacing:.1em;color:var(--budian-text-muted)}.connection{font:12px var(--budian-font-mono);color:var(--budian-text-muted)}.connection.ready{color:var(--budian-success)}.top-settings{display:none}.scroller{overflow-y:auto;overscroll-behavior:contain;flex:1;min-height:0}.messages{width:min(820px,calc(100% - 40px));margin:0 auto;min-height:100%;padding:32px 0 34px}.empty{min-height:calc(100dvh - 280px);display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center}.empty-symbol{display:grid;place-items:center;width:68px;height:68px;border:1px solid var(--budian-border);border-radius:21px;background:var(--budian-surface-strong);font-size:28px;font-weight:790;letter-spacing:-.06em;margin-bottom:29px;box-shadow:var(--budian-shadow-sm)}.empty .eyebrow{color:var(--budian-accent);margin:0 0 14px}.empty h1{font-size:clamp(29px,3.3vw,44px);letter-spacing:-.06em;line-height:1.2;margin:0 0 12px}.empty p:last-child{margin:0;color:var(--budian-text-muted);font-size:14px}.message{display:flex;gap:13px;margin:22px 0 36px}.message.user{justify-content:flex-end}.bubble-user{max-width:min(680px,85%);background:var(--budian-surface-strong);border:1px solid var(--budian-border);border-radius:19px 19px 5px 19px;padding:13px 17px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7}.bubble-user .bubble-images{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:9px}.bubble-user img{width:100px;height:100px;object-fit:cover;border-radius:9px;border:1px solid var(--budian-border)}.message.assistant{align-items:flex-start}.avatar{flex:none;width:34px;height:34px;border-radius:11px;background:var(--budian-text-primary);color:var(--budian-bg);display:grid;place-items:center;font-size:15px;font-weight:800}.assistant-body{min-width:0;flex:1;padding:3px 0}.assistant-name{font-size:13px;font-weight:750;margin-bottom:8px}.assistant-text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.85;font-size:16px;min-height:24px}.assistant-text:empty:after{content:'▋';color:var(--budian-accent);animation:blink 1s steps(1) infinite}@keyframes blink{50%{opacity:0}}.trace{border-left:2px solid var(--budian-border);margin:12px 0 18px;padding:2px 0 2px 13px;color:var(--budian-text-muted);font-size:13px}.trace summary{cursor:pointer;min-height:28px;display:flex;align-items:center;gap:8px;list-style:none}.trace summary::-webkit-details-marker{display:none}.trace summary:before{content:'▸';font-size:11px}.trace[open] summary:before{content:'▾'}.trace .trace-inner{padding:11px 0 0}.trace-row{display:flex;gap:8px;justify-content:space-between;padding:7px 0;border-bottom:1px solid var(--budian-border);font-size:12px}.trace-row span:last-child{white-space:nowrap}.trace-stats{padding-top:12px;font:12px var(--budian-font-mono);font-variant-numeric:tabular-nums}.sources{margin-top:17px;border-top:1px solid var(--budian-border);padding-top:12px;font-size:13px}.sources a{display:block;max-width:100%;overflow-wrap:anywhere;margin:6px 0;color:var(--budian-accent)}.composer-area{flex:none;background:linear-gradient(to bottom,transparent,var(--budian-bg) 18%);padding:13px 24px max(15px,env(safe-area-inset-bottom))}.composer-wrap{width:min(820px,100%);margin:0 auto}.composer{border:1px solid var(--budian-border-strong);border-radius:20px;background:var(--budian-surface-strong);box-shadow:var(--budian-shadow-sm);padding:14px 14px 11px}.composer:focus-within{border-color:var(--budian-accent)}.composer textarea{display:block;width:100%;resize:none;min-height:48px;max-height:180px;overflow-y:auto;border:0;background:transparent;color:var(--budian-text-primary);font-size:16px;line-height:1.6;outline:0;padding:4px 4px 8px}.composer textarea::placeholder{color:var(--budian-text-muted)}.composer-bottom,.composer-tools,.send-actions{display:flex;align-items:center}.composer-bottom{justify-content:space-between;gap:10px}.composer-tools{gap:8px;min-width:0}.tool-button{display:grid;place-items:center;width:42px;height:42px;flex:none;border:0;border-radius:11px;background:transparent;color:var(--budian-text-secondary)}.effort-group{display:flex;align-items:center;gap:2px;padding:3px;background:var(--budian-bg-inset);border:1px solid var(--budian-border);border-radius:12px}.effort-label{font-size:12px;color:var(--budian-text-muted);padding:0 9px 0 6px;white-space:nowrap}.effort-btn{min-width:44px;min-height:36px;border:0;border-radius:8px;background:transparent;color:var(--budian-text-muted);font-size:12px;font-weight:700}.effort-btn.active{background:var(--budian-surface-strong);color:var(--budian-text-primary);box-shadow:var(--budian-shadow-sm)}.send{display:grid;place-items:center;width:43px;height:43px;flex:none;border:0;border-radius:13px;background:var(--budian-text-primary);color:var(--budian-bg)}.send svg{stroke-width:2}.send.stop{font-size:18px}.hint{text-align:center;margin:9px 0 0;color:var(--budian-text-muted);font-size:12px;min-height:18px}.hint.error{color:var(--budian-danger)}.attachment-list{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:10px}.attachment{position:relative;width:68px;height:68px;border-radius:12px;overflow:hidden;border:1px solid var(--budian-border)}.attachment img{width:100%;height:100%;object-fit:cover}.attachment button{position:absolute;right:2px;top:2px;width:22px;height:22px;border:0;border-radius:50%;color:white;background:rgba(0,0,0,.7);line-height:1}.scrim{display:none}dialog{width:min(520px,calc(100% - 28px));max-height:min(780px,calc(100dvh - 28px));padding:0;border:1px solid var(--budian-border);border-radius:24px;background:var(--budian-surface-strong);color:var(--budian-text-primary);box-shadow:var(--budian-shadow-xl);overflow:auto}dialog::backdrop{background:var(--budian-overlay);backdrop-filter:blur(7px)}.modal{padding:26px}.modal-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:13px}.modal-head .eyebrow{margin:0 0 7px;color:var(--budian-accent)}.modal-head h2{font-size:30px;line-height:1.2;margin:0;letter-spacing:-.05em}.close{font-size:27px}.setting-row{border-top:1px solid var(--budian-border);padding:18px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}.setting-row h3,.setting-api h3{margin:0;font-size:15px}.setting-row p{margin:4px 0 0;font-size:12px;color:var(--budian-text-muted)}.segments{display:flex;flex:none;padding:3px;background:var(--budian-bg-inset);border:1px solid var(--budian-border);border-radius:12px}.segments button{min-width:53px;min-height:38px;border:0;border-radius:9px;color:var(--budian-text-muted);background:transparent;font-size:12px;font-weight:700}.segments button.active{background:var(--budian-surface-strong);color:var(--budian-text-primary);box-shadow:var(--budian-shadow-sm)}.setting-api{border-top:1px solid var(--budian-border);padding:20px 0 10px;display:flex;flex-direction:column;gap:8px}.setting-api .eyebrow{color:var(--budian-accent);margin:0 0 3px}.setting-api h3{font-size:19px;letter-spacing:-.03em;margin-bottom:8px}.setting-api label{font-size:13px;font-weight:660;margin-top:9px}.setting-api label span{color:var(--budian-text-muted);font-weight:400}.setting-api input{width:100%;min-height:45px;padding:0 12px;border-radius:11px;border:1px solid var(--budian-border);background:var(--budian-bg-inset);color:var(--budian-text-primary);outline:0;font-family:var(--budian-font-mono);font-size:13px}.setting-api input:focus{border-color:var(--budian-accent)}.api-note{margin:9px 0 0;color:var(--budian-text-muted);font-size:12px;line-height:1.6}.done{min-height:46px;width:100%;border:0;border-radius:12px;background:var(--budian-text-primary);color:var(--budian-bg);font-weight:700;margin-top:10px}@media(max-width:900px){.app{grid-template-columns:1fr}.sidebar{position:fixed;z-index:50;left:0;top:0;bottom:0;width:min(280px,83vw);transform:translateX(-100%);transition:transform .25s var(--budian-ease-standard)}.sidebar.open{transform:none}.side-close,.mobile-menu{display:grid}.scrim:not([hidden]){display:block;position:fixed;inset:0;z-index:49;background:var(--budian-overlay)}.chat-top{padding:0 20px}.top-settings{display:grid}}@media(max-width:640px){.chat-top{height:68px;padding:0 12px}.top-left{gap:6px}.top-sub{font-size:9px}.connection{display:none}.messages{width:calc(100% - 28px);padding-top:20px}.empty{min-height:calc(100dvh - 250px)}.empty h1{font-size:30px}.message{gap:9px}.bubble-user{max-width:89%}.composer-area{padding:8px 12px max(10px,env(safe-area-inset-bottom))}.composer{padding:10px}.effort-label{display:none}.effort-btn{min-width:40px}.hint{font-size:11px}.modal{padding:20px}.setting-row{align-items:flex-start;flex-direction:column;gap:10px}.segments{width:100%}.segments button{flex:1}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Chat workspace refinement */
:root{--chat-canvas:#fbfcfe;--chat-sidebar:#f0f2f6;--chat-hover:rgba(35,124,255,.07);--chat-bubble:#ecf3ff}
:root[data-theme="dark"]{--chat-canvas:#090c12;--chat-sidebar:#11151d;--chat-hover:rgba(72,184,255,.1);--chat-bubble:#19283a}
body{background:var(--chat-canvas)}
.app{grid-template-columns:258px minmax(0,1fr)}
.sidebar{background:var(--chat-sidebar);padding:25px 16px 18px}
.side-head{padding-bottom:36px}
.brand-mark{border-radius:10px}
.new-chat{background:transparent;border-color:var(--budian-border-strong);box-shadow:none}
.new-chat:hover{background:var(--budian-surface-strong)}
.side-label{margin-top:37px}
.side-bottom{display:block;padding-top:13px}
.side-model{display:flex;align-items:center;gap:9px;min-height:35px;padding:0 11px}
.side-settings{display:flex;align-items:center;gap:12px;width:100%;height:46px;padding:0 11px;border:0;border-radius:11px;background:transparent;color:var(--budian-text-primary);text-align:left;font-weight:640}
.side-settings:hover{background:var(--budian-surface-strong)}
.side-settings svg{width:18px;height:18px}
.main{background:var(--chat-canvas)}
.chat-top{height:80px;padding:0 clamp(20px,4vw,60px);background:var(--chat-canvas)}
.top-left strong{font-size:16px;margin-top:3px;letter-spacing:-.025em}
.top-sub{color:var(--budian-accent);font-weight:700;letter-spacing:.15em}
.connection{padding:7px 0}
.settings-top{display:flex;align-items:center;gap:9px;min-height:44px;padding:0 15px;border:1px solid var(--budian-border);border-radius:12px;background:var(--budian-surface-strong);color:var(--budian-text-primary);font-weight:650;font-size:13px}
.settings-top:hover{border-color:var(--budian-accent);background:var(--chat-hover)}
.settings-top svg{width:17px;height:17px}
.messages{width:min(840px,calc(100% - 56px));padding:44px 0 38px}
.empty{min-height:calc(100dvh - 290px);align-items:flex-start;text-align:left;max-width:720px;margin:auto;padding:clamp(55px,11vh,130px) 0 35px;justify-content:flex-start}
.empty-symbol{width:54px;height:54px;border-radius:15px;font-size:22px;box-shadow:none;margin-bottom:45px;border-color:var(--budian-border-strong)}
.empty .eyebrow{margin-bottom:18px}
.empty h1{max-width:680px;font-size:clamp(37px,4.2vw,59px);font-weight:760;line-height:1.11;letter-spacing:-.067em;margin-bottom:16px}
.empty .empty-copy{max-width:520px;color:var(--budian-text-secondary);font-size:15px;line-height:1.65;margin:0}
.setup-cta{min-height:44px;padding:0 17px;margin-top:27px;border:1px solid var(--budian-border-strong);border-radius:12px;background:var(--budian-surface-strong);color:var(--budian-text-primary);font-size:13px;font-weight:690}
.setup-cta:hover{border-color:var(--budian-accent)}
.message{margin:24px 0 43px}
.bubble-user{background:var(--chat-bubble);border-color:color-mix(in srgb,var(--budian-accent) 12%,var(--budian-border));border-radius:18px 18px 4px 18px;box-shadow:none}
.message.assistant{margin-top:29px}
.avatar{width:32px;height:32px;border-radius:9px}
.assistant-name{font-size:13px;letter-spacing:-.01em;margin:3px 0 11px}
.assistant-body{padding:0}
.trace{margin:0 0 16px;border-left:0;padding:0}
.trace summary{display:inline-flex;color:var(--budian-text-muted);font:12px var(--budian-font-mono);padding:6px 0}
.trace .trace-inner{max-width:450px;border-left:1px solid var(--budian-border);margin-left:3px;padding:6px 0 2px 14px}
.trace-row{padding:5px 0}
.assistant-text{font-size:16px;line-height:1.78;white-space:normal;overflow-wrap:anywhere}
.assistant-text>p{margin:0 0 15px}
.assistant-text>p:last-child{margin-bottom:0}
.assistant-text h2,.assistant-text h3,.assistant-text h4,.assistant-text h5{font-size:1.2em;line-height:1.4;letter-spacing:-.02em;margin:26px 0 11px}
.assistant-text h3,.assistant-text h4,.assistant-text h5{font-size:1.05em}
.assistant-text strong{font-weight:780;color:var(--budian-text-primary)}
.assistant-text em{font-style:italic}
.assistant-text ul,.assistant-text ol{padding-left:1.45em;margin:5px 0 17px}
.assistant-text li{padding-left:3px;margin:5px 0}
.assistant-text li::marker{color:var(--budian-accent)}
.assistant-text blockquote{margin:14px 0;padding:2px 0 2px 16px;border-left:3px solid var(--budian-accent);color:var(--budian-text-secondary)}
.assistant-text pre{margin:15px 0 19px;padding:18px 20px;overflow:auto;background:var(--budian-code-bg);color:var(--budian-code-text);border:1px solid var(--budian-code-border);border-radius:13px;font:13px/1.7 var(--budian-font-mono);white-space:pre}
.assistant-text p code,.assistant-text li code{padding:2px 5px;border-radius:5px;background:var(--budian-bg-inset);font:13px var(--budian-font-mono)}
.assistant-text a{color:var(--budian-accent);text-decoration:underline;text-underline-offset:2px}
.composer-area{padding:12px 24px max(16px,env(safe-area-inset-bottom));background:var(--chat-canvas);border-top:1px solid color-mix(in srgb,var(--budian-border) 65%,transparent)}
.composer-wrap{width:min(840px,100%)}
.composer{background:var(--budian-surface-strong);border-color:var(--budian-border-strong);border-radius:18px;box-shadow:none;padding:14px 15px 11px}
.composer:focus-within{box-shadow:0 0 0 3px color-mix(in srgb,var(--budian-accent) 12%,transparent)}
.composer textarea{min-height:46px}
.hint{margin-top:8px}
.modal{padding:30px 32px}
.modal-head{margin-bottom:25px}
.setting-row{padding:22px 0}
.setting-api{padding-top:26px}
.setting-api input{background:var(--chat-canvas)}
@media(max-width:900px){.app{grid-template-columns:1fr}.sidebar{width:min(280px,84vw)}.top-settings{display:flex}.chat-top{padding:0 20px}}
@media(max-width:640px){.chat-top{height:68px;padding:0 13px}.top-actions{gap:6px}.settings-top{padding:0 11px;gap:5px}.settings-top svg{width:16px;height:16px}.messages{width:calc(100% - 28px);padding:27px 0}.empty{min-height:calc(100dvh - 255px);padding:43px 4px 20px}.empty-symbol{margin-bottom:32px}.empty h1{font-size:clamp(33px,9vw,43px)}.empty .empty-copy{font-size:14px}.composer-area{padding:9px 12px max(11px,env(safe-area-inset-bottom))}.modal{padding:23px 20px}.message{margin:15px 0 34px}}
@media(max-width:370px){.connection{display:none}.settings-top span{display:none}.settings-top{width:44px;justify-content:center}.effort-btn{min-width:36px}.composer-tools{gap:4px}}

/* Composer inspired by the reference's controls above a pill input. */
.composer{position:relative;display:flex;flex-direction:column;gap:11px;padding:0;border:0;background:transparent;box-shadow:none;border-radius:0}
.composer:focus-within{border:0;box-shadow:none}
.composer-bottom{display:contents}
.composer-tools{order:0;display:flex;gap:8px;min-height:42px;align-items:center;flex-wrap:wrap}
.composer textarea{order:1;min-height:56px;height:56px;max-height:180px;padding:14px 62px 12px 63px;border:1px solid var(--budian-border-strong);border-radius:28px;background:var(--budian-surface-strong);line-height:1.6;box-shadow:var(--budian-shadow-sm);resize:none}
.composer textarea:focus{border-color:var(--budian-accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--budian-accent) 12%,transparent)}
.composer .tool-button{order:2;position:absolute;bottom:6px;left:7px;width:44px;height:44px;border-radius:50%;background:var(--budian-bg-inset);color:var(--budian-text-primary)}
.composer .tool-button svg{width:22px;height:22px;stroke-width:2}
.send-actions{position:absolute;right:7px;bottom:7px}
.send{width:42px;height:42px;border-radius:50%}
.citation-toggle,.effort-toggle{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:36px;padding:0 13px;border:1px solid var(--budian-border-strong);border-radius:19px;background:var(--budian-surface-strong);color:var(--budian-text-secondary);font-size:13px;font-weight:620;white-space:nowrap}
.citation-toggle:hover,.effort-toggle:hover{border-color:var(--budian-accent);color:var(--budian-text-primary)}
.citation-toggle.active{color:var(--budian-accent);border-color:color-mix(in srgb,var(--budian-accent) 42%,var(--budian-border));background:color-mix(in srgb,var(--budian-accent) 7%,var(--budian-surface-strong))}
.citation-dot{width:7px;height:7px;border-radius:50%;background:var(--budian-text-muted)}
.citation-toggle.active .citation-dot{background:var(--budian-accent)}
.effort-picker{position:relative}
.effort-toggle strong{font-weight:700;color:var(--budian-text-primary)}
.effort-toggle svg{width:14px;height:14px}
.effort-toggle[aria-expanded=true]{border-color:var(--budian-accent)}
.effort-popover{position:absolute;left:0;bottom:calc(100% + 10px);z-index:10;width:min(360px,calc(100vw - 44px));padding:20px 21px 17px;border:1px solid var(--budian-border-strong);border-radius:24px;background:var(--budian-surface-strong);box-shadow:var(--budian-shadow-xl)}
.effort-popover[hidden]{display:none}
.effort-popover-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:19px}
.effort-popover-top strong{font-size:17px;letter-spacing:-.02em}
.effort-popover-top span{color:var(--budian-text-muted);font:12px var(--budian-font-mono)}
.effort-popover input[type=range]{appearance:none;-webkit-appearance:none;width:100%;height:10px;margin:8px 0 20px;border-radius:20px;background:linear-gradient(to right,var(--budian-accent) var(--progress),var(--budian-bg-inset) var(--progress));cursor:pointer}
.effort-popover input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:27px;height:27px;border:5px solid white;border-radius:50%;background:var(--budian-accent);box-shadow:0 1px 8px rgba(0,0,0,.25)}
.effort-popover input[type=range]::-moz-range-thumb{width:17px;height:17px;border:5px solid white;border-radius:50%;background:var(--budian-accent);box-shadow:0 1px 8px rgba(0,0,0,.25)}
.effort-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:3px}
.effort-steps button{min-height:32px;padding:2px;border:0;background:transparent;color:var(--budian-text-muted);font-size:12px;white-space:nowrap}
.effort-steps button.active{color:var(--budian-accent);font-weight:750}
.assistant-text .citation-link{display:inline-block;padding:0 5px;border-radius:5px;background:color-mix(in srgb,var(--budian-accent) 12%,transparent);color:var(--budian-accent);font-size:.82em;font-weight:700;text-decoration:none}
@media(max-width:640px){.composer-area{padding:9px 12px max(11px,env(safe-area-inset-bottom))}.composer-tools{gap:6px}.effort-toggle,.citation-toggle{padding:0 10px;font-size:12px}.effort-toggle span:first-child{display:none}.composer textarea{padding-left:60px;min-height:55px}.effort-popover{left:auto;right:-4px}}

/* Chat input: controls live inside the composer, with send/stop sharing one slot. */
.composer{display:flex;flex-direction:column;gap:8px;padding:12px 13px 10px;border:1px solid var(--budian-border-strong);border-radius:22px;background:var(--budian-surface-strong);box-shadow:var(--budian-shadow-sm)}
.composer:focus-within{border:1px solid var(--budian-border-strong);box-shadow:0 0 0 3px color-mix(in srgb,var(--budian-accent) 10%,transparent)}
.composer textarea{order:0;width:100%;min-height:54px;height:auto;max-height:180px;margin:0;padding:6px 6px 3px;border:0;border-radius:0;background:transparent;box-shadow:none;resize:none}
.composer textarea:focus{border:0;box-shadow:none}
.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.composer-tools{order:0;display:flex;align-items:center;gap:6px;flex-wrap:wrap;min-height:38px}
.composer .tool-button{position:static;width:36px;height:36px;flex:none;border-radius:11px;background:transparent;color:var(--budian-text-secondary)}
.composer .tool-button:hover{background:var(--budian-bg-inset)}
.feature-pill{height:32px;display:inline-flex;align-items:center;gap:6px;padding:0 9px;border:1px solid var(--budian-border);border-radius:9px;background:transparent;color:var(--budian-text-muted);font-size:12px;font-weight:680;white-space:nowrap}
.feature-pill .feature-dot{width:6px;height:6px;border-radius:50%;background:currentColor}
.feature-pill[aria-pressed=true].search-pill{color:#1367db;border-color:color-mix(in srgb,#2284ff 42%,var(--budian-border));background:color-mix(in srgb,#2386ff 10%,var(--budian-surface-strong))}
.feature-pill[aria-pressed=true].citation-pill{color:#168454;border-color:color-mix(in srgb,#19a56b 40%,var(--budian-border));background:color-mix(in srgb,#1eb775 10%,var(--budian-surface-strong))}
.feature-pill[aria-pressed=true].agent-pill{color:#a56600;border-color:color-mix(in srgb,#ecad20 52%,var(--budian-border));background:color-mix(in srgb,#efbb40 16%,var(--budian-surface-strong))}
.feature-pill[aria-pressed=false]{opacity:.68}
.composer-actions{display:flex;align-items:center;justify-content:flex-end;gap:5px;margin-left:auto}
.inline-picker{height:34px;display:inline-flex;align-items:center;gap:4px;padding:0 8px;border:0;border-radius:9px;background:transparent;color:var(--budian-text-secondary);font-size:12px;font-weight:690;white-space:nowrap}
.inline-picker:hover,.inline-picker[aria-expanded=true]{background:var(--budian-bg-inset);color:var(--budian-text-primary)}
.inline-picker svg{width:13px;height:13px}
.model-picker,.effort-picker{position:relative}
.model-popover{position:absolute;right:0;bottom:calc(100% + 9px);z-index:12;width:190px;padding:6px;border:1px solid var(--budian-border-strong);border-radius:14px;background:var(--budian-surface-strong);box-shadow:var(--budian-shadow-xl)}
.model-popover[hidden]{display:none}
.model-popover button{width:100%;min-height:40px;padding:0 12px;border:0;border-radius:9px;background:transparent;color:var(--budian-text-primary);text-align:left;font-size:13px}
.model-popover button:hover,.model-popover button.active{background:var(--budian-bg-inset);font-weight:700}
.effort-popover{left:auto;right:0;bottom:calc(100% + 9px)}
.send-actions{position:static;margin-left:2px}
.send{width:36px;height:36px;border-radius:11px}
.send[hidden],.tool-button[hidden],.feature-pill[hidden]{display:none!important}
.send.stop{background:var(--budian-accent);color:white}
@media(max-width:720px){.composer-bottom{align-items:flex-end}.composer-tools{width:100%}.composer-actions{width:100%;justify-content:flex-end}.feature-pill{font-size:11px}.effort-popover{right:-35px}}
@media(max-width:370px){.feature-pill{padding:0 7px}.composer{padding:10px}.composer-tools{gap:3px}.effort-popover{right:-41px}}

/* Chat surface and the compact reference composer */
:root[data-theme="light"]{--chat-canvas:#fff;--chat-sidebar:#f8f8f8;--chat-bubble:#f3f3f4;--budian-bg:#fff;--budian-bg-inset:#f3f3f4;--budian-surface-strong:#fff;--budian-text-primary:#151515;--budian-text-secondary:#4e4e51;--budian-text-muted:#818186;--budian-border:#e8e8e9;--budian-border-strong:#dedee0;--budian-accent:#1879e8;--budian-shadow-sm:0 2px 12px rgba(0,0,0,.035)}
:root[data-theme="dark"]{--chat-canvas:#151515;--chat-sidebar:#1c1c1d;--chat-bubble:#28282a;--budian-bg:#151515;--budian-bg-inset:#29292b;--budian-surface-strong:#222224;--budian-text-primary:#f5f5f5;--budian-text-secondary:#c9c9cc;--budian-text-muted:#a0a0a5;--budian-border:#303033;--budian-border-strong:#424246;--budian-accent:#76adf8;--budian-shadow-sm:none}
.sidebar{background:var(--chat-sidebar);border-right:1px solid var(--budian-border)}
.main,.chat-top,.composer-area{background:var(--chat-canvas)}
.chat-top{height:66px;border-bottom:1px solid var(--budian-border)}
.composer-area{padding:12px clamp(12px,3vw,32px) max(14px,env(safe-area-inset-bottom));border-top:0}
.composer-wrap{width:min(920px,100%)}
.composer-modes{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:0 0 13px;padding:0 2px}
.mode-chip{min-height:37px;padding:0 15px;display:inline-flex;align-items:center;gap:9px;white-space:nowrap;border:1px solid;border-radius:999px;font-size:13px;font-weight:650;background:transparent;transition:background .15s ease,border-color .15s ease}
.mode-dot{width:8px;height:8px;flex:none;border-radius:50%;background:currentColor}
.thinking-chip{color:#2371bb;border-color:#a7cbeb;background:#edf6ff}
.citation-chip{color:#299453;border-color:#b6e2c5;background:#effbf3}
.agent-chip{color:#b4791f;border-color:#ecd09e;background:#fff8ed}
.mode-chip[aria-pressed="false"]{color:var(--budian-text-muted);border-color:var(--budian-border-strong);background:transparent}
.mode-chip:hover{filter:brightness(.96)}
:root[data-theme="dark"] .thinking-chip[aria-pressed="true"]{color:#8cc6ff;border-color:#385a76;background:#1c344a}
:root[data-theme="dark"] .citation-chip[aria-pressed="true"]{color:#8fdfac;border-color:#365942;background:#203b2b}
:root[data-theme="dark"] .agent-chip[aria-pressed="true"]{color:#f1c77c;border-color:#6a5030;background:#3d3020}
.composer,.composer:focus-within{position:relative;display:flex;flex-direction:row;align-items:center;gap:5px;padding:6px 7px 6px 9px;min-height:64px;border:1px solid var(--budian-border-strong);border-radius:999px;background:var(--budian-surface-strong);box-shadow:var(--budian-shadow-sm)}
.composer:focus-within{border-color:#b9bdc4}
.composer .tool-button{order:0;position:static;display:grid;place-items:center;flex:none;width:41px;height:41px;border:0;border-radius:50%;background:var(--budian-bg-inset);color:var(--budian-text-primary)}
.composer .tool-button:hover{background:var(--budian-border-strong)}
.search-compact{order:1;display:inline-flex;align-items:center;justify-content:center;gap:5px;flex:none;min-width:37px;height:37px;padding:0 9px;border:1px solid #bad8f4;border-radius:999px;color:#1673d0;background:#eff6ff;font-size:11px;font-weight:700}
.search-compact svg{width:15px;height:15px;stroke-width:2.2}
:root[data-theme="dark"] .search-compact{background:#20364c;color:#9acbff;border-color:#405e77}
.composer textarea,.composer textarea:focus{order:2;flex:1;width:auto;min-width:48px;min-height:26px;height:26px;max-height:140px;margin:0;padding:0 4px;border:0;outline:0;border-radius:0;background:transparent;box-shadow:none;line-height:26px;font-size:15px;color:var(--budian-text-primary);resize:none;overflow-y:auto}
.composer textarea::placeholder{color:#8b8b8e}
.composer-actions{order:3;display:flex;align-items:center;gap:0;flex:none;margin-left:auto;width:auto}
.inline-picker{height:38px;padding:0 5px;border-radius:8px;font-size:13px;font-weight:600;color:var(--budian-text-primary)}
.effort-toggle{color:var(--budian-text-muted);padding-left:3px;padding-right:7px}
.send-actions{position:static;margin:0 0 0 5px}
.send{display:grid;place-items:center;width:46px;height:46px;border:0;border-radius:50%;background:#101010;color:#fff}
.send:hover{background:#333}
.send:disabled{opacity:.52}
.send svg{width:22px;height:22px;stroke-width:2.5}
.send.stop{background:#101010;color:white;font-size:16px}
.send[hidden],.tool-button[hidden]{display:none!important}
:root[data-theme="dark"] .send,:root[data-theme="dark"] .send.stop{background:#f5f5f5;color:#161616}
.model-popover,.effort-popover{background:var(--budian-surface-strong);border-color:var(--budian-border-strong);box-shadow:0 12px 40px rgba(0,0,0,.13)}
.effort-popover{right:0;bottom:calc(100% + 18px)}
.bubble-user{background:var(--chat-bubble);border:0;border-radius:18px 18px 5px 18px}
.hint{margin:8px 0 0;color:var(--budian-text-muted);font-size:11px}
.empty-symbol{background:#151515;color:white}
@media(max-width:720px){.composer-area{padding:10px 12px max(12px,env(safe-area-inset-bottom))}.composer-modes{gap:6px;margin-bottom:10px}.mode-chip{min-height:34px;padding:0 11px;gap:6px;font-size:12px}.mode-dot{width:7px;height:7px}.composer{gap:2px;padding:5px;min-height:57px}.composer .tool-button{width:35px;height:35px}.composer .tool-button svg{width:19px;height:19px}.search-compact{width:32px;min-width:32px;height:32px;padding:0}.search-compact span{display:none}.composer textarea,.composer textarea:focus{font-size:14px;padding:0 2px}.inline-picker{font-size:11px;padding:0 3px}.send-actions{margin-left:3px}.send{width:42px;height:42px}.effort-popover{right:-46px;width:min(340px,calc(100vw - 30px))}}
@media(max-width:370px){.mode-chip{padding:0 8px;font-size:11px}.composer .tool-button{width:31px;height:31px}.search-compact{width:28px;min-width:28px;height:28px}.inline-picker{font-size:10px}.effort-toggle{padding:0 2px}.send{width:38px;height:38px}.composer textarea,.composer textarea:focus{font-size:13px}}

.trace{margin:6px 0 16px;color:var(--budian-text-secondary)}
.trace>summary{font:500 12px/1.5 var(--budian-font-sans);color:var(--budian-text-secondary);padding:7px 0}
.trace[open]>.trace-inner{width:min(100%,620px);max-width:none;margin:5px 0 0 3px;padding:3px 0 4px 15px}
.trace-row{align-items:baseline;gap:14px;padding:7px 0;border-bottom:1px solid var(--budian-border);font-size:12px}
.trace-row span:last-child{white-space:normal;text-align:right;color:var(--budian-text-muted)}
.trace-row[data-status="running"] span:last-child{color:var(--budian-accent)}
.trace-row[data-status="error"] span:last-child{color:var(--budian-danger)}
.trace-row[data-status="done"] span:last-child{color:#27915c}
.trace-output{border-bottom:1px solid var(--budian-border);padding:3px 0 7px}
.trace-output summary{cursor:pointer;display:list-item;list-style:disclosure-closed inside;padding:6px 0;color:var(--budian-text-secondary);font-size:12px}
.trace-output[open] summary{list-style:disclosure-open inside}
.trace-output pre{white-space:pre-wrap;overflow-wrap:anywhere;max-height:340px;overflow:auto;margin:4px 0 7px;padding:12px 14px;border:1px solid var(--budian-border);border-radius:12px;background:var(--budian-bg-inset);color:var(--budian-text-secondary);font:12px/1.65 var(--budian-font-mono)}
:root[data-theme="dark"] .trace-row[data-status="done"] span:last-child{color:#87d5a6}

/* One neutral model and reasoning picker */
.agent-chip[aria-pressed="true"]{background:var(--budian-surface-strong);border-color:var(--budian-border-strong);color:var(--budian-text-secondary)}
.agent-chip[aria-pressed="true"] .mode-dot{background:#ee9b32}
:root[data-theme="dark"] .agent-chip[aria-pressed="true"]{background:var(--budian-surface-strong);border-color:var(--budian-border-strong);color:var(--budian-text-secondary)}
.decision-picker{position:relative}
.decision-toggle{display:inline-flex;gap:7px;align-items:center;height:40px;padding:0 8px;color:var(--budian-text-primary);background:var(--budian-bg-inset);border-radius:999px}
.decision-toggle #effort-current{color:var(--budian-text-muted);font-weight:550}
.decision-toggle svg{width:14px;height:14px;color:var(--budian-text-muted)}
.decision-popover{position:absolute;z-index:20;right:0;bottom:calc(100% + 14px);width:min(350px,calc(100vw - 28px));padding:17px 18px 16px;border:1px solid var(--budian-border);border-radius:23px;background:var(--budian-surface-strong);box-shadow:0 15px 50px rgba(0,0,0,.12)}
.decision-popover[hidden],.decision-view[hidden]{display:none!important}
.decision-head{display:flex;align-items:center;justify-content:center;gap:9px;width:100%;min-height:38px;padding:0 0 16px;border:0;background:transparent;color:var(--budian-text-primary);font-size:17px}
.decision-head strong{font-weight:650}
.decision-head span{color:var(--budian-text-muted);font-size:25px;line-height:1}
.decision-popover input[type=range]{appearance:none;-webkit-appearance:none;width:100%;height:13px;margin:15px 0 12px;border-radius:999px;background:linear-gradient(to right,#087bfa var(--progress),#e9e9eb var(--progress));cursor:pointer}
.decision-popover input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:32px;height:32px;border:1px solid #dedee0;border-radius:50%;background:#fff;box-shadow:0 1px 8px rgba(0,0,0,.14)}
.decision-popover input[type=range]::-moz-range-thumb{width:30px;height:30px;border:1px solid #dedee0;border-radius:50%;background:#fff;box-shadow:0 1px 8px rgba(0,0,0,.14)}
.decision-popover .effort-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:2px}
.decision-popover .effort-steps button{font-size:12px;white-space:nowrap}
.decision-back{width:100%;padding:8px 9px 14px;border:0;background:transparent;color:var(--budian-text-secondary);text-align:left;font-size:13px}
.model-options{display:grid;gap:4px}
.model-options button{width:100%;min-height:48px;padding:0 12px;border:0;border-radius:12px;background:transparent;color:var(--budian-text-primary);text-align:left;font-size:15px}
.model-options button.active:after{content:'✓';float:right;font-size:19px}
.model-options button:hover,.model-options button.active{background:var(--budian-bg-inset)}
:root[data-theme="dark"] .decision-popover input[type=range]{background:linear-gradient(to right,#268cff var(--progress),#45454a var(--progress))}
@media(max-width:720px){.decision-toggle{gap:4px;padding:0 7px;font-size:11px}.decision-toggle #model-current{display:block;max-width:72px;overflow:hidden;text-overflow:ellipsis}.decision-popover{right:-47px}.composer-modes{gap:7px}}
@media(max-width:370px){.decision-toggle{padding:0 4px;gap:3px;font-size:10px}.decision-toggle #model-current{max-width:54px}.decision-toggle svg{display:none}.decision-popover{right:-41px}}

.search-chip[aria-pressed="true"]{color:#2673bb;border-color:#a7cbeb;background:#edf6ff}
:root[data-theme="dark"] .search-chip[aria-pressed="true"]{color:#8cc6ff;border-color:#385a76;background:#1c344a}
.decision-toggle{height:32px;gap:4px;padding:0 5px;border-radius:7px;background:transparent;font-size:12px;font-weight:600}
.decision-toggle:hover,.decision-toggle[aria-expanded="true"]{background:var(--budian-bg-inset)}
.decision-toggle svg{width:12px;height:12px}
.decision-toggle #model-current{max-width:60px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.decision-toggle #effort-current{font-weight:500}
.clear-key{align-self:flex-end;padding:4px 0;border:0;background:transparent;color:var(--budian-text-secondary);font-size:12px;text-decoration:underline;text-underline-offset:3px}
.clear-key:hover{color:var(--budian-text-primary)}
@media(max-width:720px){.decision-toggle{height:32px;gap:3px;padding:0 3px;font-size:11px}.decision-toggle #model-current{max-width:48px}.decision-toggle svg{width:11px;height:11px}}
@media(max-width:370px){.decision-toggle{font-size:10px}.decision-toggle #model-current{max-width:37px}}

.decision-popover{width:min(262px,calc(100vw - 28px));padding:13px 14px 12px;border-radius:18px}
.decision-popover.models-open{width:min(190px,calc(100vw - 28px));padding:9px;border-radius:16px}
.decision-head{min-height:28px;padding-bottom:11px;font-size:15px}
.decision-head span{font-size:21px}
.decision-popover input[type=range]{height:10px;margin:10px 0 9px}
.decision-popover input[type=range]::-webkit-slider-thumb{width:24px;height:24px}
.decision-popover input[type=range]::-moz-range-thumb{width:22px;height:22px}
.decision-popover .effort-steps{grid-template-columns:repeat(3,minmax(0,1fr))}
.decision-popover .effort-steps button{min-height:27px;font-size:11px}
.model-options button{min-height:40px;padding:0 9px;font-size:12px}
.model-options button.active:after{font-size:16px}
.decision-back{padding:7px 8px 10px;font-size:12px}

.safety-setting{align-items:center}
.switch{width:47px;height:27px;flex:none;padding:3px;border:1px solid var(--budian-border-strong);border-radius:999px;background:var(--budian-bg-inset);transition:background .16s ease}
.switch span{display:block;width:19px;height:19px;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.18);transition:transform .16s ease}
.switch[aria-checked="true"]{background:var(--budian-accent);border-color:var(--budian-accent)}
.switch[aria-checked="true"] span{transform:translateX(20px)}
@media(max-width:640px){.safety-setting{flex-direction:row;align-items:center}}

.send .stop-square{display:none;width:14px;height:14px;border-radius:3px;background:currentColor}
.send[data-running="true"] .send-icon{display:none}
.send[data-running="true"] .stop-square{display:block}
.thread-row{display:flex;align-items:center;min-width:0;border-radius:11px}
.thread-row:hover,.thread-row.active{background:var(--budian-surface-strong)}
.thread-row .thread{min-width:0;flex:1;background:transparent;color:var(--budian-text-secondary)}
.thread-row.active .thread{color:var(--budian-text-primary)}
.thread-delete{flex:none;width:32px;height:32px;margin-right:5px;border:0;border-radius:8px;background:transparent;color:var(--budian-text-muted);font-size:20px;line-height:1;opacity:0}
.thread-row:hover .thread-delete,.thread-delete:focus-visible{opacity:1}
.thread-delete:hover{background:var(--budian-bg-inset);color:var(--budian-danger)}
@media(hover:none){.thread-delete{opacity:1}}
.effort-slider-wrap{position:relative}
.decision-popover .effort-slider-wrap input[type=range]{display:block;position:relative;z-index:1}
.decision-view.ultra-effort .decision-head strong{color:#5a22c7}
.decision-popover .decision-view.ultra-effort .effort-slider-wrap input[type=range]{height:20px;margin:12px 0 10px}
.decision-popover .decision-view.ultra-effort .effort-slider-wrap input[type=range]::-webkit-slider-thumb{width:28px;height:28px}
.decision-popover .decision-view.ultra-effort .effort-slider-wrap input[type=range]::-moz-range-thumb{width:27px;height:27px}
.decision-view.ultra-effort .effort-slider-wrap input[type=range],
:root[data-theme="dark"] .decision-view.ultra-effort .effort-slider-wrap input[type=range]{background:radial-gradient(circle at 13% 73%,#fff 0 1px,transparent 2px),radial-gradient(circle at 36% 37%,#fff 0 1px,transparent 2px),radial-gradient(circle at 57% 69%,#fff 0 1px,transparent 2px),radial-gradient(circle at 76% 30%,#fff 0 1px,transparent 2px),radial-gradient(circle at 83% 75%,#fff 0 1px,transparent 2px),linear-gradient(105deg,#0646ca 0%,#5324ea 57%,#6622df 100%)}
.decision-view.ultra-effort .effort-slider-wrap::after{content:'✦';position:absolute;z-index:2;pointer-events:none;top:50%;left:58%;transform:translateY(-54%);color:#fff;font-size:11px;line-height:1;text-shadow:34px 5px 0 #fff,73px -3px 0 #fff}
.decision-view.ultra-effort .effort-steps button.active{color:#6124dc}
:root[data-theme="dark"] .decision-view.ultra-effort .decision-head strong,:root[data-theme="dark"] .decision-view.ultra-effort .effort-steps button.active{color:#bb9aff}