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var(--border-default);border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite;flex:0 0 auto}@keyframes spin{to{transform:rotate(360deg)}}.input-form{display:flex;align-items:flex-end;gap:12px;padding:20px 24px;border-top:1px solid var(--border-default);background:var(--surface-overlay);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.message-input{flex:1;padding:14px;background:var(--surface-elevated);border:1px solid var(--border-default);border-radius:8px;color:var(--text-primary);font-size:15px;line-height:1.5;outline:none;resize:vertical;min-height:80px;max-height:300px}.message-input:focus{border-color:var(--brand);box-shadow:var(--focus-ring)}.message-input:disabled{opacity:.58;cursor:not-allowed;background:var(--surface-sunken)}.send-button{min-height:48px;padding:14px 28px;background:var(--brand);border:1px solid var(--brand);border-radius:8px;color:#fff;font-size:15px;font-weight:800;cursor:pointer;transition:background .2s;white-space:nowrap;align-self:flex-end}.send-button:hover:not(:disabled){background:var(--brand-hover);border-color:var(--brand-hover)}.send-button:disabled{opacity:.5;cursor:not-allowed;background:var(--surface-sunken);border-color:var(--border-default);color:var(--text-muted)}@media(max-width:820px){.chat-interface{height:auto;min-height:calc(100vh - 220px);border-left:0}.messages-container{padding:18px}.user-message .message-content{max-width:100%}.input-form{position:sticky;bottom:0;padding:14px;flex-direction:column}.message-input,.send-button{width:100%}}*{box-sizing:border-box}.app{display:flex;height:100vh;width:100%;overflow:hidden;background-color:var(--surface-base);background-image:var(--gradient-mesh);color:var(--text-primary);font-family:Manrope,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}@media(max-width:820px){.app{flex-direction:column;height:auto;min-height:100vh;overflow:visible}}