:root{--teams-purple: #5b5fc7;--teams-purple-dark: #4a4eb5;--teams-bg: #f0f0f5;--panel: #ffffff;--sidebar-bg: #f5f5fa;--border: #e1e1ea;--text: #242424;--muted: #616161;--bubble-mine: #e8ebfa;--bubble-other: #ffffff;--green: #6bb700;--red: #c4314b}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--teams-bg);color:var(--text);height:100vh}#root{height:100vh}.center-screen{height:100vh;display:flex;align-items:center;justify-content:center;color:var(--muted)}button{cursor:pointer;font-family:inherit}input{font-family:inherit}.auth-page{height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--teams-purple),#7b3fe4)}.auth-card{background:#fff;width:360px;padding:36px 32px;border-radius:12px;box-shadow:0 20px 60px #00000040;display:flex;flex-direction:column;gap:14px}.auth-logo{font-size:26px;font-weight:700;color:var(--teams-purple);text-align:center}.auth-logo span{color:var(--text);font-weight:400}.auth-card h2{font-size:18px;font-weight:600;text-align:center;color:var(--muted)}.auth-card input{padding:12px 14px;border:1px solid var(--border);border-radius:6px;font-size:14px}.auth-card input:focus{outline:2px solid var(--teams-purple);border-color:transparent}.auth-card button{padding:12px;background:var(--teams-purple);color:#fff;border:none;border-radius:6px;font-size:15px;font-weight:600}.auth-card button:hover{background:var(--teams-purple-dark)}.auth-card button:disabled{opacity:.6;cursor:default}.auth-error{background:#fde7ea;color:var(--red);padding:8px 12px;border-radius:6px;font-size:13px}.auth-switch{font-size:13px;text-align:center;color:var(--muted)}.auth-switch a{color:var(--teams-purple);text-decoration:none;font-weight:600}.app-shell{display:grid;grid-template-columns:320px 1fr;height:100vh}.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border)}.me{display:flex;align-items:center;gap:10px}.me-info{display:flex;flex-direction:column}.me-info strong{font-size:14px}.me-info span{font-size:12px;color:var(--green)}.avatar{position:relative;width:38px;height:38px;border-radius:50%;background:var(--teams-purple);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;flex-shrink:0}.avatar.sm{width:30px;height:30px;font-size:11px}.avatar.xl{width:90px;height:90px;font-size:30px}.presence-dot{position:absolute;bottom:0;right:0;width:11px;height:11px;background:var(--green);border:2px solid var(--sidebar-bg);border-radius:50%}.icon-btn{background:transparent;border:none;font-size:18px;padding:6px 8px;border-radius:6px}.icon-btn:hover{background:#0000000f}.search-box{padding:12px}.search-box input{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:18px;font-size:13px;background:#fff}.search-box input:focus{outline:2px solid var(--teams-purple);border-color:transparent}.search-results{border-bottom:1px solid var(--border);max-height:240px;overflow-y:auto}.convo-list{flex:1;overflow-y:auto}.convo-list-label{padding:12px 16px 6px;font-size:12px;font-weight:700;text-transform:uppercase;color:var(--muted);letter-spacing:.04em}.empty-hint{padding:12px 16px;font-size:13px;color:var(--muted)}.list-item{display:flex;align-items:center;gap:12px;padding:10px 16px;cursor:pointer}.list-item:hover{background:#0000000a}.list-item.active{background:#e6e6f5}.list-text{overflow:hidden}.list-text strong{display:block;font-size:14px}.list-text span{display:block;font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-window{display:flex;flex-direction:column;background:var(--panel);height:100vh;overflow:hidden}.chat-window.empty{align-items:center;justify-content:center}.empty-state{text-align:center;color:var(--muted)}.empty-logo{font-size:32px;font-weight:700;color:var(--teams-purple);margin-bottom:10px}.empty-logo span{color:var(--text);font-weight:400}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--border)}.chat-peer{display:flex;align-items:center;gap:12px}.chat-peer strong{font-size:16px}.call-actions{display:flex;gap:6px}.messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:8px;background:var(--teams-bg)}.msg-row{display:flex;align-items:flex-end;gap:8px;max-width:70%}.msg-row.mine{align-self:flex-end;flex-direction:row-reverse}.bubble{background:var(--bubble-other);padding:8px 12px;border-radius:8px;box-shadow:0 1px 1px #00000014}.msg-row.mine .bubble{background:var(--bubble-mine)}.bubble-author{font-size:12px;font-weight:700;color:var(--teams-purple);margin-bottom:2px}.bubble-text{font-size:14px;line-height:1.4;word-break:break-word}.bubble-time{font-size:10px;color:var(--muted);text-align:right;margin-top:3px}.typing-indicator{font-size:12px;color:var(--muted);font-style:italic;padding-left:4px}.composer{display:flex;gap:10px;padding:14px 20px;border-top:1px solid var(--border);background:var(--panel)}.composer input{flex:1;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:14px}.composer input:focus{outline:2px solid var(--teams-purple);border-color:transparent}.composer button{width:46px;background:var(--teams-purple);color:#fff;border:none;border-radius:8px;font-size:16px}.composer button:hover{background:var(--teams-purple-dark)}.composer button:disabled{opacity:.5}.call-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#14141ed9;display:flex;align-items:center;justify-content:center;z-index:1000}.call-card{background:#2b2b3c;color:#fff;padding:40px 50px;border-radius:16px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:12px;min-width:320px}.call-card.ringing .avatar.xl{animation:pulse 1.6s infinite}@keyframes pulse{0%,to{box-shadow:0 0 #5b5fc799}50%{box-shadow:0 0 0 18px #5b5fc700}}.call-card h2{font-size:22px}.call-card p{color:#c9c9d4;font-size:14px}.call-controls{display:flex;gap:16px;margin-top:10px}.call-btn{padding:12px 28px;border:none;border-radius:24px;font-size:15px;font-weight:600;color:#fff}.call-btn.accept{background:var(--green)}.call-btn.decline{background:var(--red)}.call-stage{width:90vw;height:88vh;display:flex;flex-direction:column;gap:16px}.audio-stage{align-items:center;justify-content:center;gap:28px}.audio-call{display:flex;flex-direction:column;align-items:center;gap:14px;color:#fff}.audio-call .avatar.xl{width:120px;height:120px;font-size:40px;animation:pulse 1.8s infinite}.audio-call h2{font-size:26px}.audio-call p{color:#c9c9d4;font-size:15px}.video-grid{flex:1;position:relative;display:flex;align-items:center;justify-content:center}.video-tile{position:relative;background:#1a1a26;border-radius:14px;overflow:hidden}.video-tile.remote{width:100%;height:100%}.video-tile.local{position:absolute;bottom:16px;right:16px;width:220px;height:150px;border:2px solid #fff;box-shadow:0 6px 20px #0006}.video-tile video{width:100%;height:100%;object-fit:cover}.video-placeholder{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:#9b9bb0;font-size:15px}.tile-name{position:absolute;bottom:8px;left:10px;color:#fff;font-size:13px;background:#00000080;padding:2px 8px;border-radius:4px}.call-controls.bar{justify-content:center}.round-btn{width:56px;height:56px;border-radius:50%;border:none;background:#3a3a4d;color:#fff;font-size:20px}.round-btn:hover{background:#4a4a60}.round-btn.off{background:#5a5a70}.round-btn.hangup{background:var(--red)}.round-btn.hangup:hover{background:#a52a40}