:root{--primary-color: #00e676;--primary-dark: #00a854;--primary-gradient: linear-gradient(135deg, #00e676, #00c853);--bg-color: #f0f2f5;--card-bg: #ffffff;--text-primary: #1c1e21;--text-secondary: #65676b;--input-bg: #f0f2f5;--border-color: #e4e6eb;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .1);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--danger: #ff4444;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--header-height: 64px;--bottom-nav-height: 60px;--max-content-width: 680px}[data-theme=dark]{--bg-color: #18191a;--card-bg: #242526;--text-primary: #e4e6eb;--text-secondary: #b0b3b8;--input-bg: #3a3b3c;--border-color: #3e4042;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .5)}*{box-sizing:border-box;touch-action:manipulation;-webkit-tap-highlight-color:transparent}body{font-family:Cairo,system-ui,-apple-system,sans-serif;background:var(--bg-color);color:var(--text-primary);margin:0;height:100vh;height:100dvh;display:flex;flex-direction:column;overflow:hidden;transition:background .3s,color .3s}#app-screen{display:flex;flex-direction:column;height:100%;width:100%}.app-container{display:flex;flex-direction:column;height:100%}.main-content{flex:1;overflow-y:auto;padding-bottom:80px;background:var(--bg-color);width:100%;max-width:var(--max-content-width);margin:0 auto;position:relative}.sidebar,.chat-panel{display:none}.content-wrapper{flex:1;width:100%;display:flex;flex-direction:column;height:100%;overflow:hidden}.communities-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px;padding:20px}.comm-card{background:var(--card-bg);border-radius:var(--radius-md);padding:20px;display:flex;flex-direction:column;align-items:center;text-align:center;box-shadow:var(--shadow-sm);border:1px solid var(--border-color);transition:all .2s;position:relative;overflow:hidden}.comm-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}.comm-icon-wrapper{width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:28px}.comm-info{margin-bottom:15px;width:100%}.comm-name{font-weight:700;margin-bottom:5px;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.comm-badge{font-size:11px;padding:2px 8px;border-radius:12px;border:1px solid;font-weight:600}.join-btn{border:none;color:#fff;padding:8px 20px;border-radius:20px;font-size:13px;font-weight:700;cursor:pointer;transition:opacity .2s;width:100%}.join-btn:hover{opacity:.9}.create-comm-btn{border:2px dashed var(--border-color);background:transparent;cursor:pointer;justify-content:center;color:var(--primary-color);font-weight:700}.create-icon-circle{width:50px;height:50px;border-radius:50%;background:var(--input-bg);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:10px;color:var(--text-primary);transition:background .2s}.create-comm-btn:hover .create-icon-circle{background:var(--primary-color);color:#fff}@media(min-width:1024px){#app-screen{flex-direction:row;background:var(--bg-color);max-width:1400px;margin:0 auto;height:100vh}.bottom-nav{display:none!important}.sidebar{display:flex;flex-direction:column;width:260px;background:var(--card-bg);border-left:1px solid var(--border-color);padding:20px;height:100vh;position:sticky;top:0;z-index:1000}.chat-panel{display:flex;flex-direction:column;width:300px;background:var(--card-bg);border-right:1px solid var(--border-color);padding:20px;height:100vh;position:sticky;top:0;overflow-y:auto}.content-wrapper{flex:1;overflow-y:auto;border-left:1px solid var(--border-color);border-right:1px solid var(--border-color);background:var(--bg-color)}.main-content{max-width:700px;margin:0 auto;padding-bottom:20px}header{max-width:700px;margin:0 auto;border-bottom:1px solid var(--border-color);background:#ffffffd9}}.sidebar-logo{margin-bottom:40px;padding:0 10px}.sidebar-nav{display:flex;flex-direction:column;gap:10px;flex:1}.sidebar-link{display:flex;align-items:center;gap:15px;padding:12px 15px;text-decoration:none;color:var(--text-secondary);border-radius:var(--radius-md);font-weight:600;font-size:16px;transition:all .2s}.sidebar-link:hover{background:var(--input-bg);color:var(--text-primary)}.sidebar-link.active{color:var(--primary-color);background:#00e6761a}.sidebar-link .icon{font-size:22px;width:30px;display:flex;justify-content:center}.profile-mini img{width:30px;height:30px;border-radius:50%;object-fit:cover;border:2px solid var(--primary-color)}.sidebar-footer{margin-top:auto;padding-top:20px;border-top:1px solid var(--border-color);color:var(--text-secondary);font-size:12px;text-align:center}.panel-section{margin-bottom:30px}.panel-section h3{font-size:16px;color:var(--text-secondary);margin-bottom:15px;font-weight:600}.online-users-list{display:flex;flex-direction:column;gap:12px}.online-user-item{display:flex;align-items:center;gap:12px;padding:8px;border-radius:var(--radius-sm);cursor:pointer;transition:background .2s}.online-user-item:hover{background:var(--input-bg)}.online-user-item img{width:40px;height:40px;border-radius:50%;object-fit:cover}.user-status-dot{width:8px;height:8px;border-radius:50%;position:absolute}.online-user-item span{font-weight:500;color:var(--text-primary)}.suggested-tags{display:flex;flex-wrap:wrap;gap:8px}.tag{background:var(--input-bg);color:var(--text-secondary);padding:6px 12px;border-radius:20px;font-size:13px;cursor:pointer;transition:all .2s}.tag:hover{background:var(--primary-color);color:#fff}.fab-btn{position:fixed;bottom:80px;right:20px;width:56px;height:56px;border-radius:50%;background:var(--primary-gradient);color:#fff;border:none;font-size:32px;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-lg);cursor:pointer;z-index:1000;transition:transform .2s,box-shadow .2s;padding-bottom:4px}.fab-btn:hover{transform:scale(1.1);box-shadow:0 10px 20px #00e67666}.fab-btn:active{transform:scale(.95)}.modal-overlay{z-index:2000!important}@media(min-width:768px)and (max-width:1023px){#app-screen{flex-direction:column;max-width:800px;margin:0 auto}.sidebar,.chat-panel{display:none}.bottom-nav{display:flex!important;max-width:800px;margin:0 auto;border-radius:20px 20px 0 0;box-shadow:0 -5px 20px #0000001a}.main-content{max-width:100%;padding:20px 20px 90px}.communities-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}.fab-btn{bottom:90px;right:30px}}@media(min-width:1024px){.fab-btn{position:absolute;bottom:30px;right:30px}.content-wrapper{position:relative}}header{background:var(--card-bg);padding:0 20px;height:var(--header-height);display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fffffff2}[data-theme=dark] header{background:#242526f2}.logo{display:flex;flex-direction:column;line-height:1}.logo-main{font-weight:900;font-size:24px;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.5px}.logo-slogan{font-size:10px;color:var(--text-secondary);font-weight:400;letter-spacing:.5px}.header-icons{display:flex;gap:8px}.header-icon-btn{background:var(--input-bg);border:none;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;color:var(--text-primary);transition:all .2s}.header-icon-btn:hover{transform:translateY(-2px);background:var(--border-color)}.stories-bar{display:flex;gap:12px;padding:20px 0;margin-bottom:10px;overflow-x:auto;background:var(--card-bg);border-bottom:1px solid var(--border-color);white-space:nowrap;scrollbar-width:none}.stories-bar::-webkit-scrollbar{display:none}.story-item{display:flex;flex-direction:column;align-items:center;cursor:pointer;position:relative;min-width:72px;transition:transform .2s}.story-item:hover{transform:scale(1.05)}.posts-container{display:flex;flex-direction:column;gap:16px;padding:0 16px}.post-card{background:var(--card-bg);padding:20px;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:1px solid var(--border-color);transition:box-shadow .2s}.post-card:hover{box-shadow:var(--shadow-md)}.post-header{display:flex;align-items:center;margin-bottom:16px}.post-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;border:2px solid var(--primary-color);margin-right:12px;cursor:pointer}.post-author{font-weight:700;font-size:16px;color:var(--text-primary);cursor:pointer}.post-time{font-size:12px;color:var(--text-secondary)}.post-text{font-size:16px;line-height:1.6;color:var(--text-primary);margin-bottom:12px}.post-image{width:100%;max-height:500px;object-fit:cover;border-radius:var(--radius-sm);margin-bottom:16px;border:1px solid var(--border-color)}.post-actions{display:flex;gap:24px;border-top:1px solid var(--border-color);padding-top:12px;color:var(--text-secondary);font-size:15px}.action-item{cursor:pointer;display:flex;align-items:center;gap:8px;padding:8px 12px;border-radius:var(--radius-sm);transition:background .2s}.action-item:hover{background:var(--input-bg)}.action-item.liked{color:#e91e63}.action-item.liked span:first-child{animation:pop .3s}@keyframes pop{0%{transform:scale(1)}50%{transform:scale(1.4)}to{transform:scale(1)}}.empty-state{text-align:center;padding:40px 20px;color:var(--text-secondary);display:flex;flex-direction:column;align-items:center;gap:15px}.empty-state-icon{font-size:48px;opacity:.5;margin-bottom:10px}.bottom-nav{position:fixed;bottom:0;left:0;width:100%;height:var(--bottom-nav-height);background:var(--card-bg);border-top:1px solid var(--border-color);display:flex;justify-content:space-around;align-items:center;z-index:100;box-shadow:0 -2px 10px #0000000d}.nav-item{display:flex;flex-direction:column;align-items:center;color:var(--text-secondary);font-size:20px;cursor:pointer;padding:8px 16px;position:relative;border-radius:12px;transition:all .2s}.nav-item.active{color:var(--primary-color)}.nav-item.active:after{content:"";position:absolute;bottom:4px;width:4px;height:4px;background:var(--primary-color);border-radius:50%}.nav-text{font-size:10px;margin-top:4px;font-weight:600}.fab-add{position:fixed;bottom:calc(var(--bottom-nav-height) + 20px);right:max(20px,calc(50% - var(--max-content-width) / 2 + 20px));left:auto;width:56px;height:56px;background:var(--primary-gradient);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:32px;box-shadow:0 4px 15px #00e67666;cursor:pointer;z-index:90;transition:transform .2s}.fab-add:hover{transform:scale(1.1) rotate(90deg)}.comm-badge{display:inline-block;background:#00e6761a;color:var(--primary-dark);padding:4px 10px;border-radius:20px;font-size:11px;margin-bottom:8px;font-weight:700}.auth-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,var(--bg-color) 0%,rgba(0,230,118,.05) 100%)}.auth-header{text-align:center;margin-bottom:30px}.app-title span{color:var(--primary-color)}.auth-subtitle{color:var(--text-secondary);margin-top:5px}.auth-box{background:var(--card-bg);padding:30px;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%;max-width:400px;text-align:center}.fade-in{animation:fadeIn .5s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.input-group{margin-bottom:15px}.auth-input{width:100%;padding:12px 15px;border:1px solid var(--border-color);border-radius:var(--radius-md);background:var(--input-bg);color:var(--text-primary);font-size:15px;outline:none;transition:border-color .2s}.auth-input:focus{border-color:var(--primary-color)}.auth-btn{width:100%;padding:12px;border:none;border-radius:var(--radius-md);font-size:16px;font-weight:600;cursor:pointer;transition:transform .1s,opacity .2s}.auth-btn:active{transform:scale(.98)}.primary-btn{background:var(--primary-gradient);color:#fff;box-shadow:0 4px 10px 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var(--card-bg);box-shadow:var(--shadow-md)}.profile-upload-btn{position:absolute;bottom:0;right:0;background:var(--primary-color);color:#fff;border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;border:2px solid var(--card-bg)}.profile-name{margin:5px 0;font-size:22px}.profile-username{color:var(--text-secondary);margin:0 0 20px;font-size:14px}.profile-stats{display:flex;gap:30px;margin-bottom:25px}.stat-item{display:flex;flex-direction:column;align-items:center}.stat-value{font-weight:800;font-size:18px;color:var(--text-primary)}.stat-label{font-size:12px;color:var(--text-secondary)}.profile-actions{display:flex;gap:10px}.profile-posts-section{padding:0 15px}.section-title{font-size:18px;margin-bottom:15px;padding:0 5px}.posts-grid{display:flex;flex-direction:column;gap:15px}.chat-actions{padding:15px;display:flex;justify-content:flex-end}.new-chat-btn{background:var(--primary-gradient);color:#fff;border:none;padding:10px 20px;border-radius:20px;font-weight:700;display:flex;align-items:center;gap:5px;cursor:pointer;box-shadow:var(--shadow-sm);transition:transform .2s}.new-chat-btn:hover{transform:translateY(-2px)}.chat-list{display:flex;flex-direction:column}.chat-item{display:flex;align-items:center;padding:15px;gap:15px;cursor:pointer;border-bottom:1px solid var(--border-color);transition:background .2s}.chat-item:hover{background:var(--bg-color)}.chat-avatar-container{position:relative}.chat-avatar{width:50px;height:50px;border-radius:50%;object-fit:cover}.chat-info{flex:1;min-width:0}.chat-name{font-weight:700;margin-bottom:4px}.chat-preview{font-size:13px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-time{font-size:11px;color:var(--text-secondary)}.chat-room-container{display:flex;flex-direction:column;height:100vh;height:100dvh;background:var(--bg-color)}.chat-room-header{background:var(--card-bg);padding:10px 15px;display:flex;align-items:center;gap:10px;box-shadow:var(--shadow-sm);z-index:10}.back-btn{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-primary);padding:0 5px}.chat-room-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover}.chat-room-name{font-weight:700;font-size:16px}.chat-messages-area{flex:1;overflow-y:auto;padding:15px;display:flex;flex-direction:column;gap:10px}.message-bubble{max-width:75%;padding:10px 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var(--border-color);background:var(--input-bg);color:var(--text-primary);outline:none}.attach-btn{background:none;border:none;font-size:20px;cursor:pointer;padding:5px}.send-btn{background:var(--primary-color);color:#fff;border:none;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .2s}.send-btn:hover{transform:scale(1.1)}.notifications-list{display:flex;flex-direction:column}.notification-item{display:flex;align-items:center;padding:15px;gap:15px;background:var(--card-bg);border-bottom:1px solid var(--border-color);cursor:pointer;transition:background .2s}.notification-item.unread{background:#00e6760d}.notification-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover}.notification-content{flex:1}.notification-text{font-size:14px;margin-bottom:4px;line-height:1.4}.notification-time{font-size:11px;color:var(--text-secondary)}.notification-dot{width:10px;height:10px;border-radius:50%;background:var(--primary-color)}.story-viewer-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000;z-index:1000;display:flex;flex-direction:column;justify-content:center}.story-progress-bar{position:absolute;top:10px;left:10px;right:10px;height:3px;background:#ffffff4d;border-radius:2px;overflow:hidden;z-index:1010}.story-progress-fill{height:100%;background:#fff;width:100%;animation:progress 5s linear forwards}@keyframes progress{0%{width:0%}to{width:100%}}.close-story-btn{position:absolute;top:20px;right:20px;background:none;border:none;color:#fff;font-size:30px;cursor:pointer;z-index:1020}.delete-story-btn{position:absolute;bottom:30px;right:20px;background:#00000080;border:none;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:1020;font-size:20px;color:#fff}.story-content-container{width:100%;height:100%;display:flex;align-items:center;justify-content:center}.story-image-full{max-width:100%;max-height:100%;object-fit:contain}.story-header-info{position:absolute;top:25px;left:20px;display:flex;align-items:center;gap:10px;z-index:1010}.story-user-avatar{width:36px;height:36px;border-radius:50%;border:2px solid var(--primary-color)}.story-user-name{color:#fff;font-weight:700;text-shadow:0 1px 2px rgba(0,0,0,.5)}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:2000;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-content{background:var(--card-bg);width:90%;max-width:400px;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden;display:flex;flex-direction:column;max-height:80vh}.modal-header{padding:15px 20px;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.close-btn{background:none;border:none;font-size:20px;cursor:pointer;color:var(--text-secondary)}.modal-body{padding:0;overflow-y:auto}.users-list{display:flex;flex-direction:column}.user-item{display:flex;align-items:center;padding:12px 20px;gap:12px;cursor:pointer;transition:background .2s}.user-item:hover{background:var(--bg-color)}.user-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover}.user-name{font-weight:600}.communities-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:15px;padding:15px}.comm-card{background:var(--card-bg);padding:20px;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);display:flex;flex-direction:column;align-items:center;text-align:center;transition:transform .2s}.comm-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.comm-icon{font-size:32px;margin-bottom:10px}.comm-name{font-weight:700;margin-bottom:5px}.create-comm-btn{border:2px dashed var(--border-color);background:transparent;cursor:pointer;color:var(--primary-color);justify-content:center}.create-comm-btn:hover{border-color:var(--primary-color);background:#00e6760d}