:root{--bg-app: #f8fafc;--bg-card: #ffffff;--bg-card-hover: #f1f5f9;--bg-card-selected: #e0f2fe;--border-color: #e2e8f0;--border-focus: #0284c7;--text-main: #0f172a;--text-muted: #64748b;--text-inverse: #ffffff;--primary: #0284c7;--primary-hover: #0369a1;--outgoing-bg: #0284c7;--outgoing-text: #ffffff;--incoming-bg: #f1f5f9;--incoming-text: #0f172a;--error-bg: #fef2f2;--error-text: #b91c1c;--error-border: #fca5a5;--font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-app);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer}input,textarea{font-family:inherit}.app-container{min-height:100vh;display:flex;flex-direction:column}.app-header{background-color:var(--bg-card);border-bottom:1px solid var(--border-color);padding:10px 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ease}.btn-primary{background-color:var(--primary);color:var(--text-inverse)}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background-color:var(--bg-card);border-color:var(--border-color);color:var(--text-main)}.btn-secondary:hover{background-color:var(--bg-card-hover)}.btn-sm{padding:4px 10px;font-size:.8125rem}.btn-block{width:100%}.login-container{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:24px 16px;overflow-y:auto}.login-about-card{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;padding:24px 28px;width:100%;max-width:560px;box-shadow:0 1px 3px #0000000a}.login-about-card h2{font-size:1rem;font-weight:600;margin-bottom:10px;color:var(--text-main)}.about-content{font-size:.875rem;color:var(--text-muted);line-height:1.55}.about-content p{margin-bottom:12px}.about-content 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p{color:var(--text-muted);font-size:.875rem;margin-bottom:24px}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:6px}.form-input{width:100%;padding:10px 12px;border:1px solid var(--border-color);border-radius:6px;font-size:.9375rem;background-color:#fff;color:var(--text-main);outline:none}.form-input:focus{border-color:var(--border-focus)}.alert-error{background-color:var(--error-bg);color:var(--error-text);border:1px solid var(--error-border);padding:10px 14px;border-radius:6px;font-size:.875rem;margin-bottom:16px}.inbox-view-container{flex:1;min-height:0;display:flex;overflow:hidden}.inbox-sidebar{width:320px;border-right:1px solid var(--border-color);background-color:var(--bg-card);display:flex;flex-direction:column}.sidebar-header{padding:16px;border-bottom:1px solid var(--border-color)}.conversation-list{flex:1;overflow-y:auto}.conversation-item{padding:12px 16px;border-bottom:1px solid var(--border-color);cursor:pointer;transition:background-color .1s ease}.conversation-item:hover{background-color:var(--bg-card-hover)}.conversation-item.active{background-color:var(--bg-card-selected);border-left:3px solid var(--primary)}.convo-top{display:flex;justify-content:space-between;margin-bottom:4px}.convo-handle{font-weight:600;font-size:.875rem}.convo-time{font-size:.75rem;color:var(--text-muted)}.convo-snippet{font-size:.8125rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.empty-state{padding:32px 16px;text-align:center;color:var(--text-muted);font-size:.875rem}.chat-main{flex:1;display:flex;flex-direction:column;background-color:#fff}.chat-header{padding:12px 20px;border-bottom:1px solid 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