:root{--primary-color:#00a884;--primary-dark:#008069;--background-default:#111b21;--background-secondary:#202c33;--background-tertiary:#2a3942;--surface-primary:#202c33;--surface-secondary:#2a3942;--text-primary:#e9edef;--text-secondary:#8696a0;--text-tertiary:#667781;--incoming-bubble:#202c33;--outgoing-bubble:#005c4b;--date-bubble:#182229;--border-default:#313d45;--icon-primary:#aebac1;--success:#00a884;--error:#f15c6d;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;--font-size-xs:11px;--font-size-sm:13px;--font-size-md:14px;--font-size-lg:16px;--font-size-xl:18px;--shadow-light:0 1px 3px rgba(0,0,0,.1);--shadow-medium:0 2px 8px rgba(0,0,0,.15);--shadow-heavy:0 4px 12px rgba(0,0,0,.25);--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-round:50%}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);background-color:var(--background-default);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}.header{background-color:var(--surface-primary);padding:var(--spacing-md) var(--spacing-lg);border-bottom:1px solid var(--border-default);position:sticky;top:0;z-index:1000;display:flex;align-items:center;justify-content:space-between;min-height:64px}.header-left{display:flex;align-items:center;gap:var(--spacing-md)}.header-title{font-size:var(--font-size-xl);font-weight:600;color:var(--text-primary)}.header-right{display:flex;align-items:center;gap:var(--spacing-sm)}.icon-button{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-round);background:transparent;border:none;color:var(--icon-primary);cursor:pointer;transition:background-color .2s ease}.icon-button:hover{background-color:var(--surface-secondary)}.icon-button:active{background-color:var(--background-tertiary)}.main-container{display:flex;flex-direction:column;min-height:calc(100vh - 64px)}.upload-section{padding:var(--spacing-xl);text-align:center;background:linear-gradient(135deg,var(--background-secondary) 0%,var(--background-default) 100%);border-bottom:1px solid var(--border-default)}.upload-title{font-size:var(--font-size-xl);font-weight:600;margin-bottom:var(--spacing-sm);color:var(--text-primary)}.upload-subtitle{font-size:var(--font-size-md);color:var(--text-secondary);margin-bottom:var(--spacing-xl)}.file-upload{position:relative;display:inline-block}.file-upload-input{position:absolute;opacity:0;width:0;height:0}.file-upload-label{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);background-color:var(--primary-color);color:white;border-radius:var(--radius-lg);cursor:pointer;font-weight:500;transition:all .2s ease;box-shadow:var(--shadow-medium)}.file-upload-label:hover{background-color:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-heavy)}.file-upload-label:active{transform:translateY(0)}.chat-controls{padding:var(--spacing-lg);background-color:var(--surface-primary);border-bottom:1px solid var(--border-default);display:none}.chat-controls.visible{display:block}.controls-row{display:flex;align-items:center;gap:var(--spacing-lg);margin-bottom:var(--spacing-md);flex-wrap:wrap}.control-group{display:flex;flex-direction:column;gap:var(--spacing-xs);min-width:200px}.control-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500}.select-input{padding:var(--spacing-sm) var(--spacing-md);background-color:var(--surface-secondary);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--font-size-md);cursor:pointer}.select-input:focus{outline:none;border-color:var(--primary-color)}.chat-stats{display:flex;align-items:center;gap:var(--spacing-lg);color:var(--text-secondary);font-size:var(--font-size-sm)}.chat-container{flex:1;background:url('./assets/images/background.webp') repeat;background-size:400px;position:relative;z-index:0;min-height:400px}.chat-container::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background-color:var(--background-default);opacity:.95;z-index:1}.chat-messages{position:relative;z-index:2;padding:var(--spacing-lg);max-width:800px;margin:0 auto;min-height:400px}.date-separator{display:flex;justify-content:center;margin:var(--spacing-lg) 0;position:sticky;top:80px;z-index:100}.date-badge{background-color:var(--date-bubble);color:var(--text-secondary);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-lg);font-size:var(--font-size-xs);font-weight:500;box-shadow:var(--shadow-light)}.message-group{margin-bottom:var(--spacing-md)}.message{display:flex;margin-bottom:var(--spacing-xs);max-width:80%}.message.outgoing{margin-left:auto;justify-content:flex-end}.message.incoming{justify-content:flex-start}.message-bubble{background-color:var(--incoming-bubble);border-radius:var(--radius-xl);padding:var(--spacing-sm) var(--spacing-md);position:relative;max-width:100%;word-wrap:break-word;box-shadow:var(--shadow-light)}.message.outgoing .message-bubble{background-color:var(--outgoing-bubble);border-bottom-right-radius:var(--radius-sm)}.message.incoming .message-bubble{border-bottom-left-radius:var(--radius-sm)}.message-header{display:flex;align-items:center;margin-bottom:var(--spacing-xs);gap:var(--spacing-sm)}.message-sender{font-size:var(--font-size-sm);font-weight:600;color:var(--primary-color)}.message-content{font-size:var(--font-size-md);line-height:1.4;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.message-time{font-size:var(--font-size-xs);color:var(--text-tertiary);text-align:right;margin-top:var(--spacing-xs)}.system-message{text-align:center;margin:var(--spacing-md) 0}.system-message-text{background-color:var(--date-bubble);color:var(--text-secondary);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-lg);font-size:var(--font-size-sm);display:inline-block}.users-section{padding:var(--spacing-lg);background-color:var(--surface-primary);border-bottom:1px solid var(--border-default);display:none;position:relative;z-index:1}.users-section.visible{display:block}.users-title{font-size:var(--font-size-md);font-weight:600;margin-bottom:var(--spacing-md);color:var(--text-primary)}.users-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-sm)}.user-chip{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background-color:var(--surface-secondary);border-radius:var(--radius-lg);border:1px solid var(--border-default)}.user-avatar{width:32px;height:32px;border-radius:var(--radius-round);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:var(--font-size-sm);color:white}.user-name{font-size:var(--font-size-sm);font-weight:500;color:var(--text-primary);flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.media-message{color:var(--text-secondary);font-style:italic}.deleted-message{color:var(--text-tertiary);font-style:italic}.edited-indicator{color:var(--text-tertiary);font-size:var(--font-size-xs);margin-left:var(--spacing-xs)}.message-link{color:var(--primary-color);text-decoration:underline}.message-link:hover{color:var(--primary-dark)}.loading{display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl);color:var(--text-secondary)}.spinner{width:24px;height:24px;border:2px solid var(--border-default);border-top:2px solid var(--primary-color);border-radius:var(--radius-round);animation:spin 1s linear infinite;margin-right:var(--spacing-sm)}@keyframes spin{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.error-message{background-color:var(--error);color:white;padding:var(--spacing-md);border-radius:var(--radius-md);margin:var(--spacing-md);text-align:center}@media (max-width:768px){.header{padding:var(--spacing-md)}.upload-section{padding:var(--spacing-lg)}.chat-messages{padding:var(--spacing-md)}.message{max-width:90%}.controls-row{flex-direction:column;align-items:stretch}.control-group{min-width:auto}}@media (max-width:480px){.header-title{font-size:var(--font-size-lg)}.upload-title{font-size:var(--font-size-lg)}.file-upload-label{padding:var(--spacing-sm) var(--spacing-lg)}.message{max-width:95%}}.hidden{display:none!important}.visible{display:block!important}.text-center{text-align:center}.mt-0{margin-top:0}.mb-0{margin-bottom:0}