:root{--primary-color:#005baa;--secondary-color:#c9252b;--app-background-color:#f3f4f6;--surface-color:#ffffff;--surface-strong-color:#ffffff;--border-color:#d7dde5;--text-color:#172033;--muted-text-color:#5f6b7a;--user-bubble-color:#dbeafe;--assistant-bubble-color:#ffffff;--error-background-color:#fee2e2;--error-border-color:#fecaca;--error-text-color:#991b1b;--app-font-family:"Roboto",sans-serif;--shadow:0 18px 60px rgba(15,23,42,0.08)}*{box-sizing:border-box}body,html{width:100%;min-height:100%;margin:0;padding:0;overflow:hidden;background:var(--app-background-color);color:var(--text-color);font-family:var(--app-font-family,"Roboto",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;width:100%;height:100vh;height:100dvh;padding:12px;overflow:hidden}.app-frame{width:min(1120px,100%);margin:0 auto;grid-template-rows:minmax(0,1fr)}.app-frame,.chat-card{height:100%;min-height:0;display:grid;overflow:hidden}.chat-card{grid-template-rows:auto minmax(0,1fr) auto;border:1px solid var(--border-color);border-radius:28px;box-shadow:var(--shadow)}.chat-card,.topbar{background:var(--surface-color)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 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8px;font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary-color)}.history-list{min-height:0;overflow-y:auto;display:grid;grid-gap:4px;gap:4px;padding:0 8px 10px;align-content:start}.history-empty{padding:12px 14px;border-radius:14px;background:var(--surface-strong-color);border:1px dashed var(--border-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 strong{font-size:.92rem;font-weight:600;line-height:1.25}.history-item span{font-size:.78rem;color:var(--muted-text-color);line-height:1.2}.history-item:hover{background:color-mix(in srgb,var(--primary-color) 4%,var(--surface-strong-color));border-color:var(--border-color)}.history-item.active{border-color:var(--primary-color);background:color-mix(in srgb,var(--primary-color) 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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}.message-stack{display:grid;grid-gap:6px;gap:6px;max-width:min(78%,760px)}.message-row.user .message-stack{justify-items:end}.message-row.assistant .message-stack{justify-items:start}.message-bubble{width:100%;border-radius:24px;padding:16px 24px;border:1px solid var(--border-color);box-shadow:0 6px 20px rgba(15,23,42,.04)}.message-row.user .message-bubble{background:var(--user-bubble-color)}.message-row.assistant .message-bubble{background:var(--assistant-bubble-color)}.message-timestamp{font-size:.78rem;color:var(--muted-text-color);line-height:1.2}.message-content>:first-child{margin-top:0}.message-content>:last-child{margin-bottom:0}.message-content ol,.message-content p,.message-content pre,.message-content ul{line-height:1.65}.message-debug{margin-top:12px;padding-top:10px;border-top:1px dashed 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