.csch{--csch-blue:#4b9cd3;--csch-blue-deep:#1a4d6e;--csch-blue-soft:rgba(75,156,211,0.12);--csch-ink:#0f1419;--csch-ink-dim:#586069;--csch-bg:#ffffff;--csch-bg-soft:#f7f9fb;--csch-line:#e6ebf1;--csch-gold:#c9a14a;--csch-shadow:0 12px 48px rgba(15,20,25,0.18);--csch-radius:14px;--csch-radius-sm:10px;--csch-font-serif:var(--font-serif,"Newsreader",Georgia,serif);--csch-font-sans:var(--font-sans,"Inter Tight",system-ui,sans-serif);--csch-font-mono:var(--font-mono,"JetBrains Mono",ui-monospace,monospace);z-index:9999}.csch-fab{position:fixed;right:18px;bottom:18px;z-index:9999;width:56px;height:56px;border-radius:999px;background:var(--csch-blue-deep);color:#ffffff;border:none;cursor:pointer;box-shadow:var(--csch-shadow);display:flex;align-items:center;justify-content:center;transition:transform .16s ease,box-shadow .16s ease,background .16s ease;font-family:var(--csch-font-sans)}.csch-fab:hover{transform:translateY(-1px);background:var(--csch-blue)}.csch-fab:focus-visible{outline:2px solid var(--csch-gold);outline-offset:3px}.csch-fab svg{width:24px;height:24px}.csch-panel{position:fixed;right:18px;bottom:88px;z-index:9999;width:min(380px,calc(100vw - 28px));height:min(620px,calc(100vh - 110px));background:var(--csch-bg);border-radius:var(--csch-radius);box-shadow:var(--csch-shadow);display:flex;flex-direction:column;overflow:hidden;color:var(--csch-ink);font-family:var(--csch-font-sans);border:1px solid var(--csch-line);animation:csch-rise .22s ease}@keyframes csch-rise{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (max-width:640px){.csch-panel{right:0;bottom:0;width:100vw;height:100dvh;border-radius:0;border:none}.csch-fab{right:14px;bottom:14px}}.csch-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px 10px;border-bottom:1px solid var(--csch-line);background:linear-gradient(180deg,#ffffff 0,var(--csch-bg-soft) 100%)}.csch-title{font-family:var(--csch-font-serif);font-weight:500;font-size:18px;letter-spacing:-.01em;margin:0}.csch-subtitle{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--csch-ink-dim);margin-top:2px}.csch-close{background:transparent;border:none;cursor:pointer;padding:6px;border-radius:6px;color:var(--csch-ink-dim)}.csch-close:hover{background:var(--csch-blue-soft);color:var(--csch-blue-deep)}.csch-msgs{flex:1;overflow-y:auto;padding:14px 16px;display:flex;flex-direction:column;gap:10px;background:var(--csch-bg)}.csch-msg{max-width:88%;font-size:14px;line-height:1.5;border-radius:var(--csch-radius-sm);padding:9px 13px;animation:csch-fadein .22s ease}@keyframes csch-fadein{0%{opacity:0;transform:translateY(2px)}to{opacity:1;transform:translateY(0)}}.csch-msg.user{align-self:flex-end;background:var(--csch-blue-deep);color:#ffffff;border-bottom-right-radius:4px}.csch-msg.assistant{align-self:flex-start;background:var(--csch-bg-soft);color:var(--csch-ink);border:1px solid var(--csch-line);border-bottom-left-radius:4px}.csch-msg.assistant.thinking{font-style:italic;color:var(--csch-ink-dim)}.csch-msg.assistant.human{border-left:3px solid var(--csch-gold);background:linear-gradient(90deg,rgba(201,161,74,.1),var(--csch-bg-soft))}.csch-human-label{font-size:10.5px;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--csch-gold);margin-bottom:4px}.csch-msg.system{align-self:center;background:rgba(201,161,74,.12);color:var(--csch-ink);font-size:12px;text-align:center;border-radius:999px;padding:6px 12px}.csch-md p{margin:0 0 8px}.csch-md p:last-child{margin-bottom:0}.csch-md ol,.csch-md ul{margin:4px 0 8px;padding-left:20px}.csch-md li{margin:2px 0}.csch-md a{color:var(--csch-blue-deep);text-decoration:underline}.csch-msg.user .csch-md a{color:#ffffff}.csch-inline-code{background:rgba(75,156,211,.18);color:var(--csch-blue-deep);padding:1px 5px;border-radius:4px}.csch-code-block,.csch-inline-code{font-family:var(--csch-font-mono);font-size:12px}.csch-code-block{background:var(--csch-ink);color:#f7f9fb;padding:10px 12px;border-radius:8px;overflow-x:auto;margin:4px 0 8px}.csch-input-row{display:flex;align-items:flex-end;gap:8px;padding:10px 12px;border-top:1px solid var(--csch-line);background:#ffffff}.csch-input{flex:1;resize:none;border:1px solid var(--csch-line);border-radius:10px;padding:9px 12px;font-family:var(--csch-font-sans);font-size:14px;line-height:1.4;outline:none;background:var(--csch-bg-soft);color:var(--csch-ink);min-height:38px;max-height:120px}.csch-input:focus{border-color:var(--csch-blue);background:#ffffff;box-shadow:0 0 0 3px var(--csch-blue-soft)}.csch-send{background:var(--csch-blue-deep);color:#ffffff;border:none;border-radius:10px;padding:9px 14px;font-family:var(--csch-font-sans);font-size:13px;letter-spacing:.02em;font-weight:500;cursor:pointer;flex-shrink:0;transition:background .14s ease}.csch-send:hover:not(:disabled){background:var(--csch-blue)}.csch-send:disabled{background:var(--csch-ink-dim);cursor:not-allowed}.csch-footer{padding:8px 14px 11px;border-top:1px solid var(--csch-line);font-size:10.5px;color:var(--csch-ink-dim);letter-spacing:.02em;text-align:center;background:var(--csch-bg-soft)}.csch-footer strong{color:var(--csch-blue-deep)}.csch-banner{font-size:12px;background:linear-gradient(90deg,rgba(201,161,74,.18),rgba(201,161,74,.08));color:var(--csch-ink);padding:8px 14px;text-align:center;border-bottom:1px solid var(--csch-line);font-family:var(--csch-font-sans)}