:root{--color-primary: #667eea;--color-primary-dark: #5a67d8;--color-primary-light: #7c8ff0;--color-secondary: #764ba2;--color-gradient: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);--color-bg: #0f0f1a;--color-bg-secondary: #1a1a2e;--color-bg-tertiary: #252542;--color-surface: #1e1e35;--color-surface-hover: #2a2a4a;--color-text: #f0f0f5;--color-text-secondary: #a0a0b5;--color-text-muted: #6b6b80;--color-border: #3a3a55;--color-border-light: #4a4a65;--color-danger: #ef4444;--color-danger-hover: #dc2626;--color-success: #10b981;--color-warning: #f59e0b;--color-like: #f43f5e;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .3);--shadow-glow: 0 0 20px rgba(102, 126, 234, .3);--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 2rem}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:1.6;color:var(--color-text);background:var(--color-bg);min-height:100vh}a{color:var(--color-primary-light);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary)}img{max-width:100%;height:auto}button{font-family:inherit;cursor:pointer}input,textarea{font-family:inherit}.app{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;padding:var(--spacing-lg) var(--spacing-md);padding-top:80px}.container{max-width:640px;margin:0 auto}.header{position:fixed;top:0;left:0;right:0;z-index:100;background:#0f0f1ad9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border)}.header-container{max-width:1200px;margin:0 auto;padding:var(--spacing-md) var(--spacing-lg);display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:var(--spacing-sm);font-weight:700;font-size:var(--font-size-xl);color:var(--color-text)}.logo:hover{color:var(--color-text)}.logo-icon{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--color-gradient);border-radius:var(--radius-lg);font-size:var(--font-size-lg);color:#fff}.nav{display:flex;align-items:center;gap:var(--spacing-md)}.nav-link{display:flex;align-items:center;gap:var(--spacing-xs);color:var(--color-text-secondary);font-size:var(--font-size-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);transition:all var(--transition-fast)}.nav-link:hover{color:var(--color-text);background:var(--color-surface)}.nav-icon{width:18px;height:18px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);font-size:var(--font-size-sm);font-weight:600;border:none;border-radius:var(--radius-full);transition:all var(--transition-fast)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--color-gradient);color:#fff;box-shadow:var(--shadow-glow)}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 0 30px #667eea66}.btn-secondary{background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-surface-hover);border-color:var(--color-border-light)}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover:not(:disabled){background:var(--color-danger-hover)}.btn-sm{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--font-size-xs)}.btn-full{width:100%}.btn-icon{display:flex;align-items:center;justify-content:center;width:32px;height:32px;padding:0;background:transparent;border:none;border-radius:var(--radius-full);color:var(--color-text-muted);transition:all var(--transition-fast)}.btn-icon:hover{background:var(--color-surface);color:var(--color-text)}.btn-icon svg{width:16px;height:16px}.delete-btn:hover{color:var(--color-danger);background:#ef44441a}.form-group{margin-bottom:var(--spacing-lg)}.form-group label{display:block;margin-bottom:var(--spacing-sm);font-size:var(--font-size-sm);font-weight:500;color:var(--color-text-secondary)}input[type=text],input[type=email],input[type=password],textarea{width:100%;padding:var(--spacing-md);font-size:var(--font-size-base);color:var(--color-text);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:all var(--transition-fast)}input:focus,textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #667eea33}input::placeholder,textarea::placeholder{color:var(--color-text-muted)}.auth-page{min-height:calc(100vh - 160px);display:flex;align-items:center;justify-content:center;padding:var(--spacing-xl)}.auth-card{width:100%;max-width:400px;padding:var(--spacing-2xl);background:var(--color-surface);border-radius:var(--radius-xl);border:1px solid var(--color-border);box-shadow:var(--shadow-lg)}.auth-header{text-align:center;margin-bottom:var(--spacing-xl)}.auth-logo{display:inline-flex;align-items:center;justify-content:center;width:60px;height:60px;margin-bottom:var(--spacing-md);background:var(--color-gradient);border-radius:var(--radius-xl);font-size:var(--font-size-2xl);font-weight:700;color:#fff}.auth-header h1{font-size:var(--font-size-xl);font-weight:600}.auth-form{margin-bottom:var(--spacing-lg)}.auth-footer{text-align:center;font-size:var(--font-size-sm);color:var(--color-text-secondary)}.error-message{padding:var(--spacing-md);margin-bottom:var(--spacing-lg);background:#ef44441a;border:1px solid rgba(239,68,68,.3);border-radius:var(--radius-md);color:var(--color-danger);font-size:var(--font-size-sm)}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--color-border)}.page-header h1{font-size:var(--font-size-2xl);font-weight:700}.filter-tabs{display:flex;background:var(--color-surface);border-radius:var(--radius-full);padding:4px}.filter-tab{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--font-size-sm);font-weight:500;color:var(--color-text-secondary);background:transparent;border:none;border-radius:var(--radius-full);transition:all var(--transition-fast)}.filter-tab.active{background:var(--color-gradient);color:#fff}.filter-tab:hover:not(.active){color:var(--color-text)}.post-form{padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);background:var(--color-surface);border-radius:var(--radius-xl);border:1px solid var(--color-border)}.post-form-header{display:flex;gap:var(--spacing-md)}.post-input{flex:1;min-height:80px;padding:var(--spacing-md);font-size:var(--font-size-base);color:var(--color-text);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);resize:vertical}.post-form-footer{display:flex;justify-content:space-between;align-items:center;margin-top:var(--spacing-md)}.char-count{font-size:var(--font-size-sm);color:var(--color-text-muted)}.char-count.warning{color:var(--color-warning)}.error-text{margin-top:var(--spacing-sm);font-size:var(--font-size-sm);color:var(--color-danger)}.avatar{display:flex;align-items:center;justify-content:center;width:44px;height:44px;background:var(--color-gradient);border-radius:var(--radius-full);font-weight:600;color:#fff;flex-shrink:0;overflow:hidden}.avatar img{width:100%;height:100%;object-fit:cover}.avatar-sm{width:32px;height:32px;font-size:var(--font-size-sm)}.avatar-md{width:44px;height:44px}.avatar-xl{width:100px;height:100px;font-size:var(--font-size-3xl)}.post-card{padding:var(--spacing-lg);margin-bottom:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-xl);border:1px solid var(--color-border);transition:all var(--transition-fast)}.post-card:hover{border-color:var(--color-border-light)}.post-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:var(--spacing-md)}.post-author{display:flex;align-items:center;gap:var(--spacing-md);color:var(--color-text)}.post-author:hover .post-author-name{color:var(--color-primary-light)}.post-author-info{display:flex;flex-direction:column}.post-author-name{font-weight:600;transition:color var(--transition-fast)}.post-author-username{font-size:var(--font-size-sm);color:var(--color-text-muted)}.post-meta{display:flex;align-items:center;gap:var(--spacing-sm)}.post-time{font-size:var(--font-size-sm);color:var(--color-text-muted)}.post-content{font-size:var(--font-size-base);line-height:1.7;white-space:pre-wrap;word-break:break-word}.post-actions{display:flex;gap:var(--spacing-lg);margin-top:var(--spacing-lg);padding-top:var(--spacing-md);border-top:1px solid var(--color-border)}.action-btn{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm);color:var(--color-text-muted);background:transparent;border:none;border-radius:var(--radius-full);transition:all var(--transition-fast)}.action-btn:hover:not(:disabled){background:var(--color-bg-secondary)}.action-btn svg{width:18px;height:18px}.action-btn.liked{color:var(--color-like)}.action-btn.active{color:var(--color-primary-light)}.comments-section{margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid var(--color-border)}.comment-form{display:flex;gap:var(--spacing-sm);margin-bottom:var(--spacing-md)}.comment-input{flex:1;padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm);color:var(--color-text);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-full)}.comments-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.comment{padding:var(--spacing-md);background:var(--color-bg-secondary);border-radius:var(--radius-lg)}.comment-author{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm);color:var(--color-text)}.comment-author-name{font-size:var(--font-size-sm);font-weight:600}.comment-content{font-size:var(--font-size-sm);line-height:1.5}.comment-meta{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-sm);font-size:var(--font-size-xs);color:var(--color-text-muted)}.comment-delete{background:none;border:none;color:var(--color-text-muted);cursor:pointer;transition:color var(--transition-fast)}.comment-delete:hover{color:var(--color-danger)}.comments-loading,.no-comments{padding:var(--spacing-md);text-align:center;font-size:var(--font-size-sm);color:var(--color-text-muted)}.profile-page{max-width:700px;margin:0 auto}.profile-header{background:var(--color-surface);border-radius:var(--radius-xl);border:1px solid var(--color-border);overflow:hidden;margin-bottom:var(--spacing-lg)}.profile-cover{height:120px;background:var(--color-gradient)}.profile-info{display:flex;flex-wrap:wrap;gap:var(--spacing-lg);padding:var(--spacing-lg);padding-top:0;margin-top:-50px}.profile-info .avatar-xl{border:4px solid var(--color-surface)}.profile-details{flex:1;min-width:200px;padding-top:60px}.profile-name{font-size:var(--font-size-2xl);font-weight:700;margin-bottom:var(--spacing-xs)}.profile-username{font-size:var(--font-size-base);color:var(--color-text-muted)}.profile-bio{margin-top:var(--spacing-md);color:var(--color-text-secondary)}.profile-actions{padding-top:60px}.profile-stats{display:flex;border-top:1px solid var(--color-border)}.stat{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-md);background:transparent;border:none;color:var(--color-text-secondary);transition:all var(--transition-fast)}.stat:hover{background:var(--color-bg-secondary)}.stat.active{color:var(--color-primary-light)}.stat-count{font-size:var(--font-size-lg);font-weight:700;color:var(--color-text)}.stat-label{font-size:var(--font-size-sm)}.profile-edit-form{display:flex;flex-direction:column;gap:var(--spacing-md);padding-top:60px}.edit-input,.edit-textarea{padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-base);color:var(--color-text);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md)}.edit-actions{display:flex;gap:var(--spacing-sm)}.users-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.user-list-item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border);color:var(--color-text);transition:all var(--transition-fast)}.user-list-item:hover{background:var(--color-surface-hover)}.user-list-info{display:flex;flex-direction:column}.user-list-name{font-weight:600}.user-list-username{font-size:var(--font-size-sm);color:var(--color-text-muted)}.loading{display:flex;justify-content:center;padding:var(--spacing-2xl);color:var(--color-text-muted)}.app-loading{display:flex;justify-content:center;align-items:center;min-height:100vh}.spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-muted)}.empty-icon{width:64px;height:64px;margin-bottom:var(--spacing-md);opacity:.5}.empty-hint{margin-top:var(--spacing-sm);font-size:var(--font-size-sm)}.error-page{text-align:center;padding:var(--spacing-2xl);color:var(--color-danger)}.footer{padding:var(--spacing-lg);text-align:center;color:var(--color-text-muted);font-size:var(--font-size-sm);border-top:1px solid var(--color-border)}@media (max-width: 640px){.header-container{padding:var(--spacing-md)}.logo-text,.nav-link span{display:none}.profile-info{flex-direction:column;align-items:center;text-align:center}.profile-details{padding-top:var(--spacing-md)}.profile-actions{padding-top:0;width:100%}.profile-actions .btn{width:100%}.page-header{flex-direction:column;gap:var(--spacing-md);align-items:flex-start}}.search-page h1{font-size:var(--font-size-2xl);margin-bottom:var(--spacing-lg)}.search-form{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.search-input{flex:1;padding:var(--spacing-md) var(--spacing-lg);font-size:var(--font-size-base);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-full);color:var(--color-text)}.search-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #667eea33}.search-section{margin-bottom:var(--spacing-xl)}.search-section h2{font-size:var(--font-size-lg);margin-bottom:var(--spacing-md);color:var(--color-text-secondary)}.user-results{display:flex;flex-direction:column;gap:var(--spacing-sm)}.user-result{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border);transition:all var(--transition-fast)}.user-result:hover{border-color:var(--color-border-light);background:var(--color-surface-hover)}.user-result-info{display:flex;flex-direction:column}.user-result-name{font-weight:600;color:var(--color-text)}.user-result-username{font-size:var(--font-size-sm);color:var(--color-text-muted)}.no-results{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-muted)}.hashtag{color:var(--color-primary-light);cursor:pointer;transition:color var(--transition-fast)}.hashtag:hover{color:var(--color-primary);text-decoration:underline}.post-stats{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-md);font-size:var(--font-size-sm);color:var(--color-text-muted)}.bookmarks-page h1{font-size:var(--font-size-2xl);margin-bottom:var(--spacing-lg)}.no-bookmarks{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-muted)}.bookmarks-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.auth-required{text-align:center;padding:var(--spacing-2xl)}.auth-required p{margin-bottom:var(--spacing-lg);color:var(--color-text-secondary)}[data-theme=light]{--color-bg: #f5f5f7;--color-bg-secondary: #ffffff;--color-bg-tertiary: #f0f0f3;--color-surface: #ffffff;--color-surface-hover: #f5f5f7;--color-text: #1a1a1a;--color-text-secondary: #4a4a4a;--color-text-muted: #8a8a8a;--color-border: #e0e0e5;--color-border-light: #d0d0d5}[data-theme=light] .header{background:#ffffffd9}.notifications-page h1{font-size:var(--font-size-2xl);margin-bottom:var(--spacing-lg)}.notifications-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg)}.notifications-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.notification-item{display:flex;align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border);cursor:pointer;transition:all var(--transition-fast)}.notification-item:hover{border-color:var(--color-border-light)}.notification-item.unread{background:linear-gradient(135deg,#667eea0d,#764ba20d);border-color:var(--color-primary)}.notification-icon{font-size:1.5rem;flex-shrink:0}.notification-content{flex:1;min-width:0}.notification-text{margin-bottom:var(--spacing-xs)}.notification-actor{font-weight:600;color:var(--color-primary-light)}.notification-post-preview{font-size:var(--font-size-sm);color:var(--color-text-muted);margin:var(--spacing-xs) 0}.notification-time{font-size:var(--font-size-xs);color:var(--color-text-muted)}.notification-unread-dot{width:8px;height:8px;background:var(--color-primary);border-radius:50%;flex-shrink:0}.no-notifications{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-muted)}.trending-page h1{font-size:var(--font-size-2xl);margin-bottom:var(--spacing-lg)}.trending-section{margin-bottom:var(--spacing-xl)}.trending-section h2{font-size:var(--font-size-lg);margin-bottom:var(--spacing-md);color:var(--color-text-secondary)}.trending-hashtags{display:flex;flex-direction:column;gap:var(--spacing-sm)}.trending-hashtag{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--radius-lg);border:1px solid var(--color-border);cursor:pointer;transition:all var(--transition-fast)}.trending-hashtag:hover{border-color:var(--color-primary);background:var(--color-surface-hover)}.trending-rank{font-weight:700;color:var(--color-text-muted);width:24px}.trending-tag{flex:1;font-weight:600;color:var(--color-primary-light)}.trending-count{font-size:var(--font-size-sm);color:var(--color-text-muted)}.no-trending{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-muted)}.action-btn.reposted{color:var(--color-success)}.action-btn.bookmarked{color:var(--color-warning)}.mention{color:var(--color-primary-light);font-weight:500}.nav-link-badge{position:relative}.badge{position:absolute;top:-4px;right:-8px;min-width:18px;height:18px;padding:0 5px;font-size:11px;font-weight:700;line-height:18px;text-align:center;color:#fff;background:var(--color-error);border-radius:9px}.theme-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast)}.theme-toggle:hover{background:var(--color-surface-hover);border-color:var(--color-primary)}.theme-toggle svg{width:18px;height:18px;color:var(--color-text-secondary);transition:color var(--transition-fast)}.theme-toggle:hover svg{color:var(--color-primary)}