:root{--primary-color:#1f2f6d;--app-background-color:#f4f6fb;--surface-color:#ffffff;--border-color:#d6ddec;--text-color:#172033;--muted-text-color:#5b677f;--error-color:#991b1b;--user-bubble-background-color:#1f2f6d;--user-bubble-text-color:#ffffff;--assistant-bubble-background-color:#eef2fa;--assistant-bubble-text-color:#172033;--surface-strong-color:color-mix(in srgb,var(--surface-color) 86%,var(--primary-color) 14%);--error-background-color:color-mix(in srgb,white 85%,var(--error-color) 15%);--error-border-color:color-mix(in srgb,white 68%,var(--error-color) 32%);--error-text-color:var(--error-color);--app-font-family:"Manrope",sans-serif;--shadow:0 10px 30px color-mix(in srgb,var(--text-color) 16%,transparent)}*{box-sizing:border-box}body,html{width:100%;margin:0;padding:0;overflow:hidden;background:radial-gradient(circle at 12% 0,color-mix(in srgb,var(--primary-color) 14%,transparent),transparent 35%),linear-gradient(180deg,var(--app-background-color) 0,color-mix(in srgb,var(--app-background-color) 75%,var(--primary-color) 25%) 100%);color:var(--text-color);font-family:var(--app-font-family,"Titillium Web",sans-serif)}body,body>*,html{height:100%}a{color:inherit}button,input,textarea{font:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.app-shell{position:fixed;inset:0;padding:0}.app-frame{width:100%;height:100%}.chat-card{height:100%;display:grid;grid-template-rows:auto minmax(0,1fr) auto;overflow:hidden;background:linear-gradient(180deg,color-mix(in srgb,var(--surface-color) 97%,transparent) 0,color-mix(in srgb,var(--surface-strong-color) 99%,transparent) 100%);border:1px solid var(--border-color);border-radius:0}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:max(12px,env(safe-area-inset-top)) 14px 12px;border-bottom:1px solid var(--border-color);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:color-mix(in srgb,var(--surface-color) 82%,transparent)}.topbar-logo{display:block;width:min(220px,100%);height:42px;object-fit:contain;object-position:left center}.topbar-actions{display:flex;align-items:center;gap:8px;margin-left:auto}.ghost-button,.icon-button,.send-button{border:0;cursor:pointer;transition:transform .12s ease,opacity .12s ease,background .12s ease}.icon-button{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:0}.icon-button svg,.send-button svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}.icon-button-ghost{background:var(--surface-strong-color);border:1px solid var(--border-color);color:var(--text-color)}.icon-button-primary,.send-button{background:linear-gradient(135deg,var(--primary-color) 0,color-mix(in srgb,var(--primary-color) 84%,black) 100%);color:#ffffff;box-shadow:0 2px 12px color-mix(in srgb,var(--primary-color) 28%,transparent)}.send-button{width:52px;min-width:52px;height:52px;display:inline-flex;align-items:center;justify-content:center;align-self:flex-end;border-radius:999px;padding:0}.ghost-button:hover,.icon-button:hover,.send-button:hover{transform:translateY(-1px)}.ghost-button:disabled,.icon-button:disabled,.send-button:disabled{opacity:.55;cursor:not-allowed;transform:none}.chat-main-grid{min-height:0;height:100%;display:grid;grid-template-columns:minmax(0,1fr);overflow:hidden}.chat-main-grid.history-open{grid-template-columns:1fr;grid-template-rows:170px minmax(0,1fr)}.history-panel{border-bottom:1px solid var(--border-color);background:color-mix(in srgb,var(--surface-strong-color) 78%,transparent);display:grid;grid-template-rows:auto minmax(0,1fr);overflow:hidden}.history-panel-title{padding:10px 14px 8px;font-size:.76rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-text-color)}.history-list{overflow-y:auto;display:grid;grid-gap:6px;gap:6px;padding:0 10px 10px}.history-empty{padding:12px;border-radius:14px;border:1px dashed var(--border-color);background:var(--surface-strong-color);color:var(--muted-text-color);font-size:.9rem}.history-item{width:100%;text-align:left;border:1px solid transparent;background:transparent;border-radius:12px;padding:10px 12px;display:grid;grid-gap:2px;gap:2px;color:var(--text-color)}.history-item span{font-size:.78rem;color:var(--muted-text-color)}.history-item.active,.history-item:hover{border-color:color-mix(in srgb,var(--primary-color) 45%,transparent);background:color-mix(in srgb,var(--primary-color) 10%,transparent)}.messages{min-height:0;overflow-y:auto;overflow-x:hidden;padding:16px 12px;background:transparent}.messages-stack{min-height:100%;display:flex;flex-direction:column;gap:8px}.messages-stack:before{content:"";margin-top:auto}.message-day-divider{display:flex;align-items:center;gap:10px;margin:4px 0;color:var(--muted-text-color);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase}.message-day-divider:after,.message-day-divider:before{content:"";flex:1 1;height:1px;background:var(--border-color)}.empty-state,.error-banner,.loading-state{border-radius:16px;padding:14px 16px}.empty-state,.loading-state{background:var(--surface-strong-color);border:1px dashed var(--border-color);color:var(--muted-text-color)}.error-banner{background:var(--error-background-color);border:1px solid var(--error-border-color);color:var(--error-text-color)}.message-row{display:flex}.message-row.user{justify-content:flex-end}.message-row.assistant{justify-content:flex-start}.typing-row{margin-top:2px}.message-stack{display:grid;grid-gap:2px;gap:2px;max-width:92%}.message-row.user .message-stack{justify-items:end}.message-row.assistant .message-stack{justify-items:start}.message-bubble{width:100%;border-radius:16px;padding:7px 14px;border:1px solid var(--border-color);box-shadow:var(--shadow)}.message-row.user .message-bubble{border-color:color-mix(in srgb,var(--primary-color) 72%,transparent);background:var(--user-bubble-background-color);color:var(--user-bubble-text-color)}.message-row.assistant .message-bubble{background:var(--assistant-bubble-background-color);color:var(--assistant-bubble-text-color)}.typing-bubble{width:-moz-fit-content;width:fit-content;min-width:68px;padding:10px 12px;border-color:color-mix(in srgb,var(--text-color) 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18px}.message-stack{max-width:min(84%,760px)}.composer{padding:12px 18px 16px}.devtools-shell{padding:0 18px 16px}.devtools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1100px){.app-frame{width:min(1120px,100%);margin:0 auto}.chat-main-grid.history-open{grid-template-columns:280px minmax(0,1fr);grid-template-rows:minmax(0,1fr)}.history-panel{border-bottom:0;border-right:1px solid var(--border-color)}}