:root{--ink:#172033;--muted:#68758a;--paper:#f5f8fc;--line:#dce5f1;--brand:#1769e0;--brand-dark:#0f4fab;--brand-pale:#eaf3ff;--surface:#fff;--danger:#c63232}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--paper);color:var(--ink);margin:0;font-family:Inter,Microsoft YaHei,Arial,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,textarea:focus-visible{outline-offset:2px;outline:3px solid #1769e038}.landing{background:radial-gradient(circle at 12% 8%, #e2f0ff 0, transparent 32%), radial-gradient(circle at 88% 94%, #e8f2ff 0, transparent 28%), var(--paper);place-items:center;min-height:100vh;padding:24px;display:grid}.access-card{border:1px solid var(--line);background:#fffffff5;border-radius:18px;width:min(100%,440px);padding:36px;box-shadow:0 16px 42px #2450891a}.eyebrow{color:var(--brand);letter-spacing:.12em;font-size:12px;font-weight:800}h1{letter-spacing:-.04em;margin:10px 0 12px;font-size:clamp(28px,5vw,38px)}h2{letter-spacing:-.02em;margin:0;font-size:19px}p{line-height:1.65}.muted{color:var(--muted);font-size:14px}.field{gap:8px;margin:22px 0 12px;font-size:14px;font-weight:700;display:grid}input,textarea{border:1px solid var(--line);background:var(--surface);width:100%;color:var(--ink);border-radius:9px;outline:none;padding:11px 12px;transition:border-color .15s,box-shadow .15s}input:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px #1769e01c}.primary,.secondary,.danger{border:1px solid #0000;border-radius:9px;padding:10px 15px;font-weight:700;transition:background .15s,border-color .15s,color 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#1d446e08}.message.user{background:var(--brand);color:#fff;border-bottom-right-radius:3px;justify-self:end}.message.assistant{background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:3px}.message-label{color:var(--muted);margin-bottom:5px;font-size:12px;display:block}.message.user .message-label{color:#d9eaff}.message-images{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;width:min(100%,400px);margin:0 0 9px;display:grid}.message-image-thumb{aspect-ratio:1;background:#dbeafe;border:1px solid #ffffff59;border-radius:7px;display:block;position:relative;overflow:hidden}.message-image-thumb img{object-fit:contain;width:100%;height:100%;display:block}.message-actions{justify-content:flex-end;align-items:center;gap:9px;margin-top:9px;display:flex}.character-count{color:var(--muted);font-size:12px}.message-action{color:var(--brand-dark);background:var(--brand-pale);border:0;border-radius:6px;padding:4px 8px;font-size:12px;font-weight:700}.message-action:hover{background:#d8eaff}.composer{border-top:1px solid var(--line);background:var(--surface);padding:15px 30px 25px;transition:background .15s,box-shadow .15s}.composer.dragging-image{background:var(--brand-pale);box-shadow:inset 0 0 0 2px var(--brand)}.file-row{flex-wrap:wrap;gap:8px;margin-bottom:9px;display:flex}.file-chip{background:var(--brand-pale);color:#244c7b;border:1px solid #cfe3ff;border-radius:999px;align-items:center;gap:6px;min-width:0;max-width:260px;padding:7px 9px;font-size:12px;display:flex}.file-index{flex:none;font-weight:700}.file-name{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.file-chip button{color:var(--danger);background:0 0;border:0;font-weight:700}.composer-box{grid-template-columns:auto 1fr auto;align-items:end;gap:10px;display:grid}.composer-tools{align-items:center;gap:8px;display:flex}.upload-label{border:1px solid 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textarea{min-height:150px}.panel>.stack>label:not(.row),.panel>label:not(.row){color:#334b66;gap:7px;font-size:14px;font-weight:700;display:grid}.stack{gap:12px;display:grid}.row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.row input[type=checkbox]{width:16px;height:16px;accent-color:var(--brand)}.spacer{flex:1}code{color:#155fc8;background:var(--brand-pale);border-radius:6px;padding:3px 6px;font-size:12px}.copy-icon{color:var(--brand-dark);background:var(--brand-pale);vertical-align:middle;border:0;border-radius:6px;margin-left:7px;padding:2px 6px;font-size:16px;line-height:1}.copy-icon:hover{background:#d8eaff}@media (max-width:760px){.landing{align-items:start;padding:12vh 16px 16px}.access-card{border-radius:14px;padding:26px 22px}.chat-page{grid-template-rows:auto minmax(0,1fr);grid-template-columns:1fr;height:100dvh;min-height:0;overflow:hidden}.sidebar{padding:calc(10px + env(safe-area-inset-top)) 12px 10px;border-right:0;border-bottom:1px solid var(--line);gap:10px}.brand{padding:0 4px;font-size:20px;line-height:1.25}.agent-list{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;width:100%;padding:0;display:grid}.agent-button{text-align:center;white-space:nowrap;min-width:0;padding:9px 4px;font-size:14px}.agent-button small,.sidebar-footer{display:none}.chat-main{grid-template-rows:auto minmax(0,1fr) auto;min-width:0;height:100%;min-height:0}.chat-header,.messages,.composer{padding-left:16px;padding-right:16px}.chat-header{gap:10px;min-width:0;padding-top:13px;padding-bottom:13px}.chat-header>div{min-width:0}.chat-header h2{font-size:18px}.chat-header .muted{overflow-wrap:anywhere;margin-top:3px;font-size:13px}.chat-header .secondary{white-space:nowrap;flex:none;padding:9px 10px}.messages{padding-top:16px;padding-bottom:16px}.empty{width:100%;max-width:320px;margin:auto;padding:0 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10px;font-size:13px}.composer-box .primary{min-width:58px;padding:10px 9px}.admin-nav{gap:12px}.admin-nav .secondary{padding:9px 11px}.row .danger{margin-left:auto}}