:root{--color-bg: #0f0f0f;--color-bg-elevated: #1a1a1a;--color-bg-input: #242424;--color-border: #2a2a2a;--color-text: #e0e0e0;--color-text-muted: #999;--color-primary: #6366f1;--color-primary-hover: #5558e3;--color-success: #10b981;--color-danger: #ef4444;--color-own-msg: #1e1b4b;--space-xs: .5rem;--space-sm: .75rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);line-height:1.6;-webkit-font-smoothing:antialiased}.login-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:var(--space-lg)}.login-card{background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:12px;padding:var(--space-xl);width:100%;max-width:400px}.login-card h1{font-size:1.75rem;margin-bottom:var(--space-lg);text-align:center}.form-group{margin-bottom:var(--space-md)}.form-label{display:block;margin-bottom:var(--space-xs);font-size:.875rem;font-weight:500;color:var(--color-text-muted)}.form-input{width:100%;padding:.75rem;background:var(--color-bg-input);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);font-size:.9375rem;transition:border-color .2s}.form-input:focus{outline:none;border-color:var(--color-primary)}.btn{width:100%;padding:.75rem;background:var(--color-primary);color:#fff;border:none;border-radius:8px;font-size:.9375rem;font-weight:600;cursor:pointer;transition:background .2s}.btn:hover{background:var(--color-primary-hover)}.btn:disabled{opacity:.5;cursor:not-allowed}.error-message{color:var(--color-danger);font-size:.875rem;margin-top:var(--space-sm);text-align:center}.chat-layout{display:flex;height:100vh;position:relative}.sidebar{width:280px;min-width:280px;background:var(--color-bg-elevated);border-right:1px solid var(--color-border);display:flex;flex-direction:column}.sidebar-header{padding:var(--space-lg);border-bottom:1px solid var(--color-border)}.sidebar-header h1{font-size:1.25rem}.room-list{flex:1;overflow-y:auto;padding:var(--space-sm)}.room-item{display:block;padding:var(--space-md);margin-bottom:var(--space-xs);background:var(--color-bg);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);text-decoration:none;transition:background .2s,border-color .2s}.room-item:hover{background:var(--color-bg-input)}.room-item.active{background:var(--color-bg-input);border-color:var(--color-primary)}.sidebar-footer{padding:var(--space-md);border-top:1px solid var(--color-border)}.logout-btn{width:100%;padding:.5rem;background:transparent;color:var(--color-text-muted);border:1px solid var(--color-border);border-radius:8px;font-size:.875rem;cursor:pointer;transition:background .2s,color .2s}.logout-btn:hover{background:var(--color-danger);color:#fff;border-color:var(--color-danger)}.sidebar-toggle{display:none;position:fixed;top:var(--space-md);left:var(--space-md);z-index:200;width:40px;height:40px;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);font-size:1.25rem;cursor:pointer;align-items:center;justify-content:center}.chat-main{flex:1;display:flex;flex-direction:column;min-width:0}.chat-room{display:flex;flex-direction:column;height:100%}.chat-header{padding:var(--space-lg);border-bottom:1px solid var(--color-border);background:var(--color-bg-elevated)}.chat-header h2{font-size:1.125rem;font-weight:600}.connection-status{font-size:.875rem;color:var(--color-text-muted);display:flex;align-items:center;gap:var(--space-xs);margin-top:var(--space-xs)}.status-dot{width:8px;height:8px;border-radius:50%;background:var(--color-danger);transition:background .3s}.status-dot.connected{background:var(--color-success)}.messages{flex:1;overflow-y:auto;padding:var(--space-lg);display:flex;flex-direction:column;gap:var(--space-md)}.empty-state{display:flex;align-items:center;justify-content:center;height:100%;color:var(--color-text-muted);font-size:1.125rem}.message{display:flex;flex-direction:column;gap:2px;padding:var(--space-sm) var(--space-md);border-radius:8px;transition:background .15s}.message:hover{background:#ffffff08}.message-own{background:var(--color-own-msg);border-radius:8px}.message-own:hover{background:var(--color-own-msg)}.message-header{display:flex;align-items:baseline;gap:var(--space-sm)}.message-sender{font-weight:600;font-size:.9375rem;color:var(--color-primary)}.message-time{font-size:.75rem;color:var(--color-text-muted)}.message-content{font-size:.9375rem;line-height:1.5;word-wrap:break-word;overflow-wrap:break-word}.typing-indicator{font-size:.875rem;color:var(--color-text-muted);font-style:italic;padding:var(--space-xs) var(--space-lg);min-height:1.75rem}.composer{padding:var(--space-lg);border-top:1px solid var(--color-border);background:var(--color-bg-elevated);display:flex;gap:var(--space-sm)}.composer-input{flex:1;padding:.75rem;background:var(--color-bg-input);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);font-size:.9375rem;resize:none;font-family:inherit}.composer-input:focus{outline:none;border-color:var(--color-primary)}.composer-button{padding:.75rem 1.5rem;background:var(--color-primary);color:#fff;border:none;border-radius:8px;font-size:.9375rem;font-weight:600;cursor:pointer;transition:background .2s}.composer-button:hover{background:var(--color-primary-hover)}.composer-button:disabled{opacity:.5;cursor:not-allowed}@media(max-width:768px){.sidebar{position:fixed;left:0;top:0;height:100%;z-index:100;transform:translate(-100%);transition:transform .3s ease}.sidebar.open{transform:translate(0);box-shadow:4px 0 24px #00000080}.sidebar-toggle{display:flex}.chat-header{padding-left:calc(var(--space-lg) + 48px)}}