.modal-overlay{position:fixed;inset:0;background-color:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .2s ease-out}.modal-content{background-color:#1a1a1a;color:#fff;padding:24px;border-radius:12px;width:400px;max-width:90vw;max-height:80vh;display:flex;flex-direction:column;box-shadow:0 10px 25px #00000080;border:1px solid #333;animation:slideUp .3s cubic-bezier(.16,1,.3,1)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.modal-header h3{margin:0;font-size:1.25rem;font-weight:600}.close-button{background:transparent;border:none;color:#888;font-size:1.5rem;cursor:pointer;padding:0;line-height:1;transition:color .2s}.close-button:hover{color:#fff;border-color:transparent}.search-input{width:100%;padding:12px;margin-bottom:20px;border-radius:8px;border:1px solid #333;background-color:#2a2a2a;color:#fff;font-size:1rem;transition:border-color .2s,box-shadow .2s;box-sizing:border-box}.search-input:focus{outline:none;border-color:#646cff;box-shadow:0 0 0 2px #646cff33}.results-list{display:flex;flex-direction:column;gap:8px;overflow-y:auto}.user-item{padding:12px;border-radius:8px;background-color:#2a2a2a;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:transform .1s,background-color .2s}.user-item:hover{background-color:#333;transform:translateY(-1px)}.user-username{font-weight:500;color:#fff}.user-email{color:#888;font-size:.85rem}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (prefers-color-scheme: light){.modal-content{background-color:#fff;color:#213547;border-color:#eee;box-shadow:0 10px 25px #0000001a}.search-input{background-color:#f5f5f5;border-color:#ddd;color:#213547}.user-item{background-color:#f9f9f9}.user-item:hover{background-color:#eee}.user-username{color:#213547}}:root{--bg-color: #1a1b1e;--sidebar-bg: #25262b;--element-bg: #2c2e33;--hover-bg: #373a40;--primary-color: #4dabf7;--primary-hover: #339af0;--text-main: #e9ecef;--text-muted: #adb5bd;--border-color: #373a40;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px rgba(0, 0, 0, .2);--radius: 12px;--font-family: "Inter", system-ui, -apple-system, sans-serif}body{margin:0;padding:0;font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased}*{box-sizing:border-box}input,button{font-family:inherit;font-size:1rem}h1,h2,h3,h4,h5,h6{margin:0;font-weight:600;color:#fff}.auth-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:2rem;background:linear-gradient(135deg,#1a1b1e,#101113)}.auth-card{background-color:var(--sidebar-bg);padding:2.5rem;border-radius:var(--radius);box-shadow:var(--shadow-md);width:100%;max-width:400px;border:1px solid var(--border-color);text-align:center}.auth-header{margin-bottom:2rem;font-size:2rem;background:linear-gradient(45deg,var(--primary-color),#748ffc);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.auth-form{display:flex;flex-direction:column;gap:1rem}.auth-input{width:100%;padding:.8rem 1rem;background-color:var(--element-bg);border:1px solid var(--border-color);border-radius:8px;color:var(--text-main);transition:all .2s}.auth-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 2px #4dabf733}.auth-button{width:100%;padding:.8rem;background-color:var(--primary-color);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:background-color .2s;margin-top:1rem}.auth-button:hover{background-color:var(--primary-hover)}.auth-toggle{margin-top:1.5rem;color:var(--text-muted);font-size:.9rem}.auth-toggle span{color:var(--primary-color);cursor:pointer;text-decoration:underline;margin-left:.5rem}.chat-layout{display:flex;height:100vh;width:100vw;overflow:hidden;background-color:var(--bg-color)}.chat-sidebar{width:300px;background-color:var(--sidebar-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column}.chat-main{flex:1;display:flex;flex-direction:column;background-color:var(--bg-color);position:relative}.sidebar-header{padding:1.5rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.sidebar-list{flex:1;overflow-y:auto;padding:1rem}.chat-item{padding:1rem;margin-bottom:.5rem;border-radius:8px;cursor:pointer;transition:background .2s;color:var(--text-muted)}.chat-item:hover{background-color:var(--hover-bg);color:var(--text-main)}.chat-item.active{background-color:#4dabf71a;color:var(--primary-color);border-left:3px solid var(--primary-color)}.message-list{flex:1;overflow-y:auto;padding:2rem;display:flex;flex-direction:column;gap:1rem}.message-bubble{max-width:70%;padding:.8rem 1.2rem;border-radius:18px;line-height:1.5;position:relative;word-wrap:break-word}.message-bubble.mine{align-self:flex-end;background-color:var(--primary-color);color:#fff;border-bottom-right-radius:4px}.message-bubble.theirs{align-self:flex-start;background-color:var(--element-bg);color:var(--text-main);border-bottom-left-radius:4px}.message-sender{font-size:.75rem;margin-bottom:.3rem;opacity:.7;display:block}.input-area{padding:1.5rem;background-color:var(--sidebar-bg);border-top:1px solid var(--border-color);display:flex;gap:1rem}.chat-input{flex:1;padding:.8rem 1.2rem;border-radius:24px;border:1px solid var(--border-color);background-color:var(--element-bg);color:var(--text-main)}.chat-input:focus{outline:none;border-color:var(--primary-color)}.send-button{background-color:var(--primary-color);color:#fff;width:45px;height:45px;border-radius:50%;border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .1s}.send-button:active{transform:scale(.95)}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#555;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#666}