:root{--primary-color:#667eea;--primary-hover:#5568d3;--secondary-color:#764ba2;--accent-color:#8b5cf6;--success-color:#10b981;--error-color:#ef4444;--warning-color:#f59e0b;--info-color:#3b82f6;--bg-primary:#ffffff;--bg-secondary:#f9fafb;--bg-tertiary:#f3f4f6;--text-primary:#111827;--text-secondary:#4b5563;--text-muted:#6b7280;--border-color:#e5e7eb;--card-shadow:0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--font-sans:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--font-normal:400;--font-medium:500;--font-semibold:600;--font-bold:700;--radius-sm:0.25rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--radius-2xl:1.5rem;--radius-full:9999px;--transition-fast:150ms ease;--transition-normal:250ms ease;--transition-slow:350ms ease;--vh:1vh}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:#fff0}html{font-size:16px;height:100%;scroll-behavior:smooth;height:-webkit-fill-available}body{font-family:var(--font-sans);line-height:1.5;color:var(--text-primary);background-color:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;height:100%;overflow:hidden;margin:0;padding:0;height:-webkit-fill-available;position:fixed;width:100%;top:0;left:0}a{color:var(--primary-color);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--primary-hover)}button,input,textarea,select{font-family:inherit;font-size:inherit;line-height:inherit;color:inherit;background:none;border:none;outline:none}button{cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}img,video{max-width:100%;height:auto;display:block}ul,ol{list-style:none}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes slideIn{from{transform:translateX(400px);opacity:0}to{transform:translateX(0);opacity:1}}@keyframes slideOut{from{transform:translateX(0);opacity:1}to{transform:translateX(400px);opacity:0}}@keyframes messageSlide{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,100%{opacity:.6}50%{opacity:1}}@keyframes wave{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}.login-container{display:flex;min-height:100vh;min-height:calc(var(--vh, 1vh) * 100);background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);align-items:center;justify-content:center;padding:20px}.glass-card{background:rgb(255 255 255 / .95);backdrop-filter:blur(10px);border-radius:20px;padding:40px;max-width:450px;width:100%;box-shadow:0 20px 60px rgb(0 0 0 / .3);animation:fadeIn 0.5s ease}.login-header{text-align:center;margin-bottom:30px}.logo{display:flex;align-items:center;justify-content:center;margin-bottom:15px}.logo i{font-size:2.5rem;color:#667eea;margin-right:10px}.logo h1{font-size:2rem;font-weight:700;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:#fff0;background-clip:text;margin:0}.subtitle{color:#666;font-size:.9rem;margin-top:5px}.form-group{margin-bottom:20px}.input-label{display:block;font-size:.9rem;font-weight:600;color:#333;margin-bottom:8px}.input-with-icon{position:relative;display:flex;align-items:center}.input-with-icon i{position:absolute;left:15px;color:#999;font-size:1.1rem;pointer-events:none;z-index:2}.modern-input{width:100%;padding:12px 15px 12px 45px;font-size:1rem;color:#333;background-color:#f5f5f5;border:2px solid #e0e0e0;border-radius:10px;transition:all 0.3s ease;outline:none}.modern-input:focus{border-color:#667eea;background-color:#fff;box-shadow:0 0 0 3px rgb(102 126 234 / .1)}.primary-button{width:100%;padding:14px;font-size:1rem;font-weight:600;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:10px;cursor:pointer;transition:all 0.3s ease;display:flex;align-items:center;justify-content:center;gap:10px}.primary-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 10px 25px rgb(102 126 234 / .4)}.primary-button:disabled{opacity:.6;cursor:not-allowed;transform:none}.login-footer{display:flex;justify-content:space-between;align-items:center;margin-top:25px;padding-top:20px;border-top:1px solid #e0e0e0;font-size:.8rem;color:#666}.security-badge,.connection-status{display:flex;align-items:center;gap:5px}.security-badge i{color:#28a745}.status-dot{width:8px;height:8px;border-radius:50%;background-color:#ffc107;animation:pulse 1.5s infinite}.status-dot.connected{background-color:#28a745;animation:none}#chat-container{display:none;flex-direction:column;height:100vh;height:calc(var(--vh, 1vh) * 100);background:#f5f5f5;position:relative;overflow:hidden}.chat-header{display:flex;align-items:center;padding:15px 20px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;box-shadow:0 2px 10px rgb(0 0 0 / .1);flex-shrink:0;position:relative;z-index:10}.icon-button{width:40px;height:40px;background:rgb(255 255 255 / .2);border:none;border-radius:50%;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.3s ease;flex-shrink:0}.icon-button:hover{background:rgb(255 255 255 / .3);transform:scale(1.1)}.header-content{flex:1;min-width:0;text-align:center}.room-info{font-size:1.1rem;font-weight:600;margin-bottom:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#active-users{font-size:.85rem;opacity:.9;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.typing-indicator-bottom{padding:8px 20px;background:var(--bg-primary);border-top:1px solid var(--border-color);color:var(--text-muted);font-size:.9rem;font-style:italic;display:flex;align-items:center;gap:5px;flex-shrink:0;justify-content:flex-start;position:relative;z-index:5}.typing-dots{display:inline-flex;align-items:flex-end;font-size:1.2em;line-height:1;height:1.2em;padding-left:2px}.typing-dots span{opacity:.3;animation:wave 1s infinite;font-weight:700;margin:0 1px}.typing-dots span:nth-child(2){animation-delay:0.2s}.typing-dots span:nth-child(3){animation-delay:0.4s}.message-container{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;padding:20px;background:#f5f5f5;display:flex;flex-direction:column;gap:12px;position:relative;min-height:0}.message-container::-webkit-scrollbar{width:8px}.message-container::-webkit-scrollbar-track{background:#e0e0e0}.message-container::-webkit-scrollbar-thumb{background:#999;border-radius:4px}.loading-indicator{text-align:center;padding:10px;font-size:.9rem;color:var(--text-muted);background:var(--bg-tertiary);border-radius:var(--radius-md);margin-bottom:10px;flex-shrink:0}.loading-indicator i{margin-right:5px;color:var(--primary-color)}.welcome-message{text-align:center;padding:40px 20px;color:#666;display:none;flex-direction:column;align-items:center;justify-content:center;flex:1;animation:fadeIn 0.5s ease}.welcome-icon{width:80px;height:80px;margin:0 auto 20px;background:linear-gradient(135deg,rgb(102 126 234 / .1),rgb(118 75 162 / .1));border-radius:50%;display:flex;align-items:center;justify-content:center}.welcome-icon i{font-size:2.5rem;color:#667eea}.welcome-message h2{font-size:1.5rem;margin-bottom:10px;color:#333}.welcome-message p{color:#666;font-size:1rem;line-height:1.6;margin-top:8px}#messages{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;padding:20px;background:#f5f5f5;display:flex;flex-direction:column;gap:12px;min-height:0}.message{max-width:70%;padding:12px 16px;border-radius:20px;word-wrap:break-word;animation:messageSlide 0.3s ease;box-shadow:0 1px 2px rgb(0 0 0 / .08);display:flex;flex-direction:column;position:relative}.message.user{align-self:flex-end;background:#007bff;color:#fff;border-radius:20px;box-shadow:0 2px 5px rgb(0 123 255 / .2);transition:transform 0.2s ease,box-shadow 0.2s ease}.message.user:hover{transform:translateY(-1px);box-shadow:0 3px 8px rgb(0 123 255 / .3)}.message.receiver{align-self:flex-start;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border-radius:20px;box-shadow:0 2px 8px rgb(102 126 234 / .3);transition:transform 0.2s ease,box-shadow 0.2s ease}.message.receiver:hover{transform:translateY(-1px);box-shadow:0 4px 12px rgb(102 126 234 / .4)}.message-content{display:flex;flex-direction:column;gap:4px}.message-username{font-weight:600;font-size:.85rem;margin-bottom:4px;display:block;opacity:.9}.message.user .message-username{display:none}.message.receiver .message-username{display:block;color:rgb(255 255 255 / .9);opacity:.95;font-weight:600}.message-text{word-wrap:break-word;white-space:pre-wrap;line-height:1.4;font-size:1rem}.message-time{font-size:.75rem;opacity:.7;margin-top:4px;display:flex;align-items:center;justify-content:flex-end;gap:4px}.seen-status{font-size:.75rem;color:#fff;flex-shrink:0;opacity:.9}.message.user .seen-status{color:rgb(255 255 255 / .9)}.message img{max-width:100%;max-height:300px;border-radius:12px;margin-top:5px;cursor:pointer;transition:transform 0.2s ease;box-shadow:0 2px 8px rgb(0 0 0 / .1)}.message img:hover{transform:scale(1.02)}.message-input-container{padding:15px 20px;background:#fff;border-top:1px solid #e0e0e0;flex-shrink:0;position:relative;z-index:5}.input-actions{display:none!important}.message-input-wrapper{display:flex;align-items:center;gap:10px;background:#f5f5f5;border-radius:25px;padding:5px 10px}#message{flex:1;min-height:40px;max-height:120px;padding:10px 0;border:none;background:#fff0;resize:none;outline:none;font-family:inherit;font-size:1rem;line-height:1.4;overflow-y:auto;font-size:16px}.send-button{width:40px;height:40px;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:50%;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.3s ease;flex-shrink:0;box-shadow:0 2px 8px rgb(102 126 234 / .3)}.send-button:hover:not(:disabled){transform:scale(1.1);box-shadow:0 4px 12px rgb(102 126 234 / .4)}.send-button:disabled{opacity:.5;cursor:not-allowed;background:#ccc;box-shadow:none}.message-actions{display:flex;justify-content:space-between;margin-top:8px;font-size:.75rem;color:#999}.character-count{font-variant-numeric:tabular-nums}.encryption-notice{display:flex;align-items:center;gap:5px}.encryption-notice i{color:#28a745}.file-upload input{display:none}.file-upload label{width:40px;height:40px;background:#667eea;border:none;border-radius:50%;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.3s ease;flex-shrink:0;box-shadow:0 2px 8px rgb(102 126 234 / .3)}.file-upload label:hover{background:#764ba2;transform:scale(1.1);box-shadow:0 4px 12px rgb(118 75 162 / .4)}.notification{position:fixed;top:20px;right:20px;padding:15px 20px;border-radius:10px;color:#fff;font-weight:500;z-index:10000;animation:slideIn 0.3s ease;box-shadow:0 4px 12px rgb(0 0 0 / .2);max-width:350px}.notification.info{background:#28a745}.notification.error{background:#dc3545}.hidden{display:none!important}@media (max-width:768px){.glass-card{padding:30px 20px;margin:10px}.message{max-width:85%;padding:10px 14px}.message-input-container{padding:10px 15px}.chat-header{padding:12px 15px}.header-content{padding:0 5px}.room-info{font-size:1rem}#active-users{font-size:.8rem}.welcome-icon{width:64px;height:64px}.welcome-icon i{font-size:2rem}.welcome-message h2{font-size:1.25rem}.welcome-message{padding:30px 15px}.message-container{padding:15px}.icon-button{width:36px;height:36px}.notification{right:10px;left:10px;max-width:none;top:10px}#message{font-size:16px;padding:8px 0}.message-text{font-size:.95rem}.message-username{font-size:.8rem}.message-time{font-size:.7rem}.login-footer{flex-direction:column;gap:10px;text-align:center}.login-footer>div{justify-content:center}}@media (max-width:896px) and (orientation:landscape){.chat-header{padding:8px 15px}.room-info{font-size:.95rem;margin-bottom:0}#active-users{display:none}.message-input-container{padding:8px 15px}.welcome-message{padding:20px 15px}.welcome-icon{width:48px;height:48px}.welcome-icon i{font-size:1.5rem}.welcome-message h2{font-size:1.1rem}.welcome-message p{font-size:.9rem}}@media (min-width:769px) and (max-width:1024px){.message{max-width:75%}.glass-card{max-width:500px}}@media print{.no-print,.chat-header,.message-input-container,.login-container,.typing-indicator-bottom{display:none!important}body,#chat-container{background-color:white!important;color:black!important;height:auto!important;overflow:visible!important}.message-container{padding:0!important;overflow:visible!important;height:auto!important}.message{break-inside:avoid;page-break-inside:avoid}}