:root{--primary-color: #3369F3;--secondary-color: #2c3e50;--background-color: #f4f4f4;--text-color: #333;--error-color: #e74c3c;--background-light: #f2f2f2;--background-color-white: #fff}body{font-family:Arial,sans-serif;line-height:1.6;background-color:#f5f5f5;display:flex;justify-content:center;align-items:center}.app{background-color:#f4f4f4;background-color:var(--background-color);padding:20px;border-radius:5px;box-shadow:0 0 10px #0000001a}h1,h2,h3{color:#2c3e50;color:var(--secondary-color)}.input,.select,.button{margin:10px 0;padding:10px;width:100%;box-sizing:border-box}.button{background-color:#3369f3;background-color:var(--primary-color);color:#fff;border:none;cursor:pointer;transition:background-color .3s ease;border-radius:8px}.button:hover{background-color:#2954c2}@supports (color: color-mix(in lch,red,blue)){.button:hover{background-color:color-mix(in srgb,var(--primary-color) 80%,black)}}.button:disabled{background-color:#bdc3c7;cursor:not-allowed}ul{list-style-type:none;padding:0}li{background-color:#fff;margin:10px 0;padding:10px;border-radius:3px;box-shadow:0 0 5px #0000001a}.error{color:#e74c3c;color:var(--error-color);font-weight:700}.footer{margin-top:20px;padding-top:20px;border-top:1px solid #2c3e50;border-top:1px solid var(--secondary-color);display:flex;justify-content:space-around}.footer-link{color:#3369f3;color:var(--primary-color);-webkit-text-decoration:none;text-decoration:none;font-weight:700}.footer-link:hover{-webkit-text-decoration:underline;text-decoration:underline}.login-card{max-width:320px;margin:50px auto;padding:30px;border-radius:12px;box-shadow:0 2px 12px #0000001a;background:#fff;text-align:center;font-family:sans-serif}.login-title{margin-bottom:24px;font-size:24px;color:#333}.login-label{display:block;text-align:left;margin-top:12px;margin-bottom:4px;font-size:12px;color:#666}.login-form input{width:100%;padding:10px;font-size:14px;margin-bottom:8px;border:none;border-bottom:1px solid var(--primary-color);outline:none}.login-footer{margin-top:16px;color:var(--primary-color)}.register-link{color:var(--primary-color);font-size:14px;-webkit-text-decoration:none;text-decoration:none}.login-button{border-radius:5px}.app-header{background-color:#f5f5f5;padding:12px 0;border-bottom:1px solid #ddd;text-align:center}.nav-bar{background-color:#f5f5f5}.nav-list{list-style:none;display:flex;gap:15px;margin:0;padding:0}.nav-link{-webkit-text-decoration:none;text-decoration:none;color:#333;font-weight:500;padding:6px 12px;border-radius:4px;transition:background-color .2s ease,color .2s ease}.nav-link:hover{color:#007bff}.nav-link:active,.nav-link.active{background-color:#007bff;color:#fff}.nav-list .nav-item{background-color:transparent;margin:0;padding:0;border-radius:0;box-shadow:none}.nav-list .nav-item{all:unset;display:list-item}body,html{margin:0;padding:0;height:100%;font-family:sans-serif}.chat-page{display:flex;height:100vh;width:100vw;overflow:hidden}.sidebar{width:300px;background-color:var(--background-light);border-right:1px solid #ccc;display:flex;flex-direction:column}.sidebar-header{padding:1rem;border-bottom:1px solid #ccc}.chat-list{list-style:none;margin:0;padding:0;flex-grow:1;overflow-y:auto}.chat-item{display:flex;align-items:center;padding:.8rem;border-bottom:1px solid #ddd;cursor:pointer}.chat-item.active{background-color:#e6e6e6}.avatar{width:40px;height:40px;border-radius:50%;margin-right:1rem}.chat-info{display:flex;flex-direction:column}.chat-name{font-weight:700}.chat-last-message{font-size:.85rem;color:#666}.chat-window{flex-grow:1;display:flex;flex-direction:column;background-color:var(--background-color-white)}.chat-header{display:flex;align-items:center;padding:1rem;border-bottom:1px solid #ccc}.chat-title{font-size:1.2rem;font-weight:700;margin-left:1rem}.chat-messages{flex-grow:1;padding:1rem;overflow-y:auto;display:flex;flex-direction:column;gap:.5rem}.message{max-width:60%;padding:.8rem;border-radius:10px;background-color:#f1f1f1}.message.from{align-self:flex-start;background-color:#e0e0e0}.message.to{align-self:flex-end;background-color:#d1e7dd}.chat-input{display:flex;padding:1rem;border-top:1px solid #ccc}.chat-input input{flex-grow:1;padding:.8rem;border:1px solid #ccc;border-radius:20px;outline:none;font-size:1rem}.chat-input button{margin-left:1rem;padding:.8rem 1.2rem;border:none;border-radius:20px;background-color:var(--primary-color);color:#fff;cursor:pointer}body{margin:0;font-family:Segoe UI,sans-serif;background-color:#f5f5f5}.profile-page{display:flex;justify-content:center;align-items:center;height:100vh}.profile-card{background-color:#fff;width:500px;padding:40px;box-shadow:0 0 20px #0000000d;text-align:center}.profile-avatar{width:100px;height:100px;background-color:#ececec;border-radius:50%;margin:0 auto 15px;background-image:url(/avatar-placeholder.svg);background-repeat:no-repeat;background-position:center;background-size:50%}.profile-name{font-weight:600;font-size:18px;margin-bottom:30px}.profile-info{text-align:left;margin-bottom:30px}.info-row{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px solid #eee}.label{color:#999;font-size:14px}.value{font-size:14px;color:#333}.profile-actions{text-align:left;display:flex;flex-direction:column;gap:10px}.action-link{font-size:14px;color:var(--primary-color);-webkit-text-decoration:none;text-decoration:none}.logout-button{background:none;border:none;color:red;font-size:14px;padding:0;cursor:pointer;text-align:left}body{margin:0;font-family:sans-serif;background:#f5f5f5}.edit-profile-page{display:flex;justify-content:center;align-items:center;height:100vh}.edit-profile-card{background:#fff;padding:40px;border-radius:8px;box-shadow:0 0 10px #0000001a;width:400px;text-align:center}.edit-profile-avatar{width:80px;height:80px;border-radius:50%;background:#e0e0e0;margin:0 auto 20px;display:flex;justify-content:center;align-items:center}.edit-profile-name{font-size:20px;margin-bottom:20px}.edit-profile-info{text-align:left}.edit-profile-info-row{margin-bottom:15px}.edit-profile-label{display:block;font-size:14px;color:#888;margin-bottom:5px}.edit-profile-input{width:100%;padding:8px 12px;font-size:16px;border:1px solid #ccc;border-radius:4px;box-sizing:border-box}.edit-profile-actions{margin-top:20px}.edit-profile-button{width:100%;padding:10px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:16px}.edit-profile-button:hover{background-color:var(--primary-color)}.edit-profile-avatar-modal{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);display:flex;justify-content:center;align-items:center;z-index:1000}.edit-profile-avatar-card{background:#fff;padding:30px;border-radius:8px;width:300px;text-align:center;box-shadow:0 0 10px #0003}.edit-profile-avatar-title{margin-bottom:20px;font-size:18px}.edit-profile-avatar-upload{display:inline-block;color:var(--primary-color);cursor:pointer;margin-bottom:20px;font-size:14px}.edit-profile-avatar-input{display:none}.edit-profile-avatar-actions{margin-top:10px}.edit-profile-avatar-button{width:100%;padding:10px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:16px}.edit-profile-avatar-button:hover{background-color:var(--primary-color)}.hidden{display:none}.change-password-page{background-color:#e5e5e5;display:flex;justify-content:center;align-items:center}.change-password-card{background-color:#fff;width:600px;padding:40px;border-radius:8px;box-shadow:0 2px 8px #0000001a;text-align:center}.change-password-avatar{width:80px;height:80px;margin:0 auto 30px;background-color:#eee;border-radius:50%;background-image:url();background-position:center;background-repeat:no-repeat;background-size:contain}.change-password-form{display:flex;flex-direction:column;gap:20px;margin-bottom:30px}.form-row{display:flex;justify-content:space-between;align-items:center}.form-label{font-size:14px;color:#333}.form-input{padding:8px 12px;border:none;border-bottom:1px solid #ccc;width:60%;font-size:14px;background:transparent;text-align:right}.save-button{background-color:var(--primary-color);color:#fff;padding:10px 0;width:160px;border:none;border-radius:6px;font-size:14px;cursor:pointer;transition:background .3s ease}.save-button:hover{background-color:#1c45cc}.error-page{display:flex;justify-content:center;align-items:center;height:100vh;text-align:center}.error-content{max-width:400px}.error-code{font-size:96px;font-weight:700;color:#d32f2f;margin:0}.error-message{font-size:24px;margin:16px 0;color:#555}.back-button{display:inline-block;margin-top:24px;padding:10px 20px;background-color:var(--primary-color);color:#fff;-webkit-text-decoration:none;text-decoration:none;border-radius:4px;transition:background-color .3s}.back-button:hover{background-color:var(--primary-color)}