*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);font-size:var(--font-size-base);background-color:var(--bg-primary);line-height:1.6;min-height:100vh}body,h1,h2,h3,h4,h5,h6{color:var(--text-primary)}h1,h2,h3,h4,h5,h6{margin-bottom:var(--spacing-md);font-weight:600}h1{font-size:var(--font-size-3xl)}h2{font-size:var(--font-size-2xl)}h3{font-size:var(--font-size-xl)}h4{font-size:var(--font-size-lg)}p{margin-bottom:var(--spacing-md);color:var(--text-secondary)}a{color:var(--accent-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--accent-secondary)}.container{max-width:1200px;margin:0 auto;padding:var(--spacing-lg)}.main-content{background-color:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-lg)}.card{background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-bottom:var(--spacing-md);transition:box-shadow var(--transition-base)}.btn{display:inline-block;padding:var(--spacing-sm) var(--spacing-lg);background-color:var(--button-bg);color:var(--text-primary);border:none;font-size:var(--font-size-base);font-weight:500;text-align:center}.btn:hover{background-color:var(--button-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-secondary{background-color:var(--bg-tertiary);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--bg-secondary)}input,select,textarea{width:100%;padding:var(--spacing-sm) var(--spacing-md);background-color:var(--input-bg);border:1px solid var(--input-border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:var(--font-size-base);font-family:var(--font-family);transition:border-color var(--transition-fast)}input:focus,select:focus,textarea:focus{border-color:var(--accent-primary)}label{display:block;margin-bottom:var(--spacing-xs);color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:500}nav{background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);padding:var(--spacing-md) 0}nav ul{list-style:none;display:flex;gap:var(--spacing-lg);align-items:center}nav a{color:var(--text-primary);font-weight:500;transition:color var(--transition-fast)}nav a:hover{color:var(--accent-primary)}header{border-bottom:1px solid var(--border-color);padding:var(--spacing-lg) 0;top:0;z-index:2}.sidebar,header{background-color:var(--bg-secondary);position:sticky}.sidebar{border:1px solid var(--border-color);border-radius:var(--radius-md);padding:var(--spacing-lg);top:calc(var(--spacing-xl) + 60px)}.sidebar-item{padding:var(--spacing-sm) var(--spacing-md);margin-bottom:var(--spacing-xs);border-radius:var(--radius-sm);transition:background-color var(--transition-fast)}.sidebar-item:hover{background-color:var(--bg-tertiary)}.post{background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.post-header{display:flex;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-md)}.post-avatar{width:48px;height:48px;border-radius:var(--radius-full);border:2px solid var(--accent-primary)}.post-content{color:var(--text-primary);margin-bottom:var(--spacing-md)}.post-actions{display:flex;gap:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid var(--border-color)}.comment{background-color:var(--bg-tertiary);border-radius:var(--radius-sm);padding:var(--spacing-md);margin-bottom:var(--spacing-sm)}.mt-1{margin-top:var(--spacing-sm)}.mt-2{margin-top:var(--spacing-md)}.mt-3{margin-top:var(--spacing-lg)}.mb-1{margin-bottom:var(--spacing-sm)}.mb-2{margin-bottom:var(--spacing-md)}.mb-3{margin-bottom:var(--spacing-lg)}.p-1{padding:var(--spacing-sm)}.p-2{padding:var(--spacing-md)}.p-3{padding:var(--spacing-lg)}.grid{gap:var(--spacing-lg)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.flex{display:flex}.gap-1{gap:var(--spacing-sm)}.gap-2{gap:var(--spacing-md)}.gap-3{gap:var(--spacing-lg)}@media (max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.container{padding:var(--spacing-md)}}:root{--bg-primary:#1a1a2e;--bg-secondary:#16213e;--bg-tertiary:#0f3460;--accent-primary:#e94560;--accent-secondary:#ff6b9d;--text-primary:#fff;--text-secondary:#b8b8b8;--border-color:#2a2a4e;--card-bg:var(--bg-secondary);--card-border:var(--border-color);--button-bg:var(--accent-primary);--button-hover:var(--accent-secondary);--input-bg:var(--bg-tertiary);--input-border:var(--border-color);--shadow-md:0 4px 8px rgba(0,0,0,.2);--shadow-lg:0 8px 16px rgba(0,0,0,.3);--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;--font-size-xs:0.75rem;--font-size-sm:0.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:2rem;--transition-fast:150ms ease;--transition-base:250ms ease;--transition-slow:350ms ease;--mobile-safe-area-top:env(safe-area-inset-top);--mobile-safe-area-bottom:env(safe-area-inset-bottom);--mobile-safe-area-left:env(safe-area-inset-left);--mobile-safe-area-right:env(safe-area-inset-right)}@viewport{width:device-width;zoom:1}@media (hover:none) and (pointer:coarse){.clickable{min-height:44px;min-width:44px;padding:12px}.button{min-height:48px;padding:14px 24px}.card{margin:8px;padding:16px}.hover-effect:hover{transform:none;box-shadow:none}}@supports (-webkit-touch-callout:none){.mobile-header{padding-top:calc(44px + var(--mobile-safe-area-top))}.mobile-bottom-nav{padding-bottom:var(--mobile-safe-area-bottom);height:calc(80px + var(--mobile-safe-area-bottom))}}@media screen and (max-width:768px){body{font-size:16px;line-height:1.5;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}.mobile-header{position:fixed;top:0;left:0;right:0;z-index:4;background:rgba(0,0,0,.95);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid hsla(0,0%,100%,.1)}.mobile-nav-container{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;height:60px}.mobile-brand{font-size:1.5rem;font-weight:700;color:#fff}.mobile-menu-toggle{background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:8px}.mobile-bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:4;background:rgba(0,0,0,.95);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:1px solid hsla(0,0%,100%,.1);justify-content:space-around;height:80px}.mobile-bottom-nav,.nav-item{display:flex;align-items:center}.nav-item{flex-direction:column;justify-content:center;color:hsla(0,0%,100%,.6);text-decoration:none;padding:8px 12px;transition:color .3s ease;min-width:60px}.nav-item.active{color:#667eea}.nav-icon{font-size:1.5rem;margin-bottom:4px}.nav-label{font-size:.75rem;font-weight:500}.mobile-main{padding-top:60px;padding-bottom:80px;min-height:100vh}.mobile-card{background:hsla(0,0%,100%,.1);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid hsla(0,0%,100%,.2);border-radius:16px;padding:16px;margin:12px;transition:all .3s ease}.mobile-card:active{transform:scale(.98);background:hsla(0,0%,100%,.15)}.mobile-post{margin-bottom:16px}.mobile-post-header{display:flex;align-items:center;margin-bottom:12px}.mobile-avatar{width:48px;height:48px;border-radius:50%;margin-right:12px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.2rem}.mobile-post-info{flex:1}.mobile-username{font-weight:600;color:#fff;margin-bottom:2px}.mobile-post-time{font-size:.875rem;color:hsla(0,0%,100%,.6)}.mobile-post-content{color:hsla(0,0%,100%,.9);margin-bottom:12px;line-height:1.6}.mobile-post-actions{display:flex;justify-content:space-around;padding-top:12px;border-top:1px solid hsla(0,0%,100%,.1)}.mobile-action-btn{background:none;border:none;color:hsla(0,0%,100%,.6);display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:8px;transition:all .3s ease;cursor:pointer;font-size:.875rem}.mobile-action-btn:active{background:hsla(0,0%,100%,.1);color:#fff}.mobile-action-btn.liked{color:#ff6b6b}.mobile-form{padding:16px}.mobile-input{width:100%;padding:16px;background:hsla(0,0%,100%,.1);border:1px solid hsla(0,0%,100%,.2);border-radius:12px;color:#fff;font-size:16px;margin-bottom:16px;appearance:none}.mobile-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px rgba(102,126,234,.3)}.mobile-textarea{min-height:120px;resize:vertical;font-family:inherit}.mobile-button{width:100%;padding:16px;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:12px;color:#fff;font-weight:600;font-size:16px;cursor:pointer;transition:all .3s ease;-webkit-tap-highlight-color:transparent}.mobile-button:active{transform:scale(.98);background:linear-gradient(135deg,#5a67d8,#6b46c1)}.mobile-button:disabled{opacity:.5;cursor:not-allowed}.mobile-grid{display:grid;grid-template-columns:1fr;gap:12px;padding:12px}.mobile-grid-2{grid-template-columns:repeat(2,1fr)}.mobile-profile-header{text-align:center;padding:24px 16px;background:hsla(0,0%,100%,.05);margin:-60px -16px 20px}.mobile-profile-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;color:#fff;font-size:2.5rem;font-weight:700}.mobile-profile-name{font-size:1.5rem;font-weight:700;color:#fff;margin-bottom:4px}.mobile-profile-bio{color:hsla(0,0%,100%,.8);margin-bottom:16px;line-height:1.5}.mobile-tabs{display:flex;background:rgba(0,0,0,.3);border-radius:12px;padding:4px;margin:16px}.mobile-tab{flex:1;padding:12px;background:none;border:none;color:hsla(0,0%,100%,.6);font-weight:500;border-radius:8px;cursor:pointer;transition:all .3s ease}.mobile-tab.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.mobile-notification{display:flex;align-items:center;padding:12px;background:hsla(0,0%,100%,.05);border-left:4px solid #667eea;margin-bottom:8px;border-radius:0 8px 8px 0}.mobile-notification.unread{background:rgba(102,126,234,.1)}.swipe-container{touch-action:pan-x;overflow-x:hidden}.swipe-item{transform:translateX(0);transition:transform .3s ease}.swipe-item.swiped-left{transform:translateX(-80px)}.swipe-actions{position:absolute;right:0;top:0;bottom:0;width:80px;display:flex;align-items:center;justify-content:center;background:#ff6b6b;color:#fff}.pull-to-refresh{position:relative;padding-top:60px;margin-top:-60px;transition:margin-top .3s ease}.pull-to-refresh.pulling{margin-top:0}.refresh-indicator{position:absolute;top:20px;left:50%;transform:translateX(-50%);font-size:1.5rem;color:hsla(0,0%,100%,.6)}.mobile-skeleton{background:linear-gradient(90deg,hsla(0,0%,100%,.1) 25%,hsla(0,0%,100%,.2) 50%,hsla(0,0%,100%,.1) 75%);background-size:200% 100%;animation:a 1.5s infinite;border-radius:8px;height:20px;margin:8px 0}@keyframes a{0%{background-position:200% 0}to{background-position:-200% 0}}.mobile-modal{position:fixed;bottom:0;left:0;right:0;background:rgba(0,0,0,.95);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-radius:20px 20px 0 0;padding:20px;transform:translateY(100%);transition:transform .3s ease;z-index:7;max-height:80vh;overflow-y:auto}.mobile-modal.open{transform:translateY(0)}.mobile-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.5);z-index:6;opacity:0;visibility:hidden;transition:all .3s ease}.mobile-modal-overlay.open{opacity:1;visibility:visible}}@media screen and (max-width:480px){.mobile-grid-2{grid-template-columns:1fr}.mobile-avatar{width:40px;height:40px;font-size:1rem}.mobile-profile-avatar{width:80px;height:80px;font-size:2rem}.mobile-card{margin:8px;padding:12px}.mobile-input{padding:12px;font-size:16px}}@media screen and (max-width:768px) and (orientation:landscape){.mobile-main{padding-top:50px;padding-bottom:60px}.mobile-bottom-nav{height:60px}.nav-label{display:none}.nav-icon{margin-bottom:0}}@media screen and (min-width:769px) and (max-width:1024px){.mobile-bottom-nav{display:none}.mobile-header{position:static;padding-top:0}.mobile-main{padding-top:0;padding-bottom:0}.mobile-grid-2{grid-template-columns:repeat(2,1fr)}.mobile-grid-3{grid-template-columns:repeat(3,1fr)}}.pwa-install-prompt{position:fixed;bottom:100px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:16px 24px;border-radius:50px;box-shadow:0 4px 20px rgba(0,0,0,.3);z-index:5;display:flex;align-items:center;gap:12px;max-width:calc(100% - 32px);animation:m .5s ease-out}.pwa-install-button{background:hsla(0,0%,100%,.2);border:none;padding:8px 16px;border-radius:20px;color:#fff;font-weight:500;cursor:pointer}.pwa-dismiss{background:none;border:none;color:hsla(0,0%,100%,.7);font-size:1.2rem;cursor:pointer;padding:4px}:root{--space-0:0;--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--text-5xl:3rem;--leading-none:1;--leading-tight:1.25;--leading-snug:1.375;--leading-normal:1.5;--leading-relaxed:1.625;--leading-loose:2;--font-normal:400;--font-medium:500;--font-semibold:600;--font-bold:700;--font-black:900;--tracking-tighter:-0.05em;--tracking-tight:-0.025em;--tracking-normal:0;--tracking-wide:0.025em;--tracking-wider:0.05em;--tracking-widest:0.1em;--radius-none:0;--radius-sm:0.25rem;--radius-base:0.5rem;--radius-md:0.75rem;--radius-lg:1rem;--radius-xl:1.5rem;--radius-2xl:2rem;--radius-full:9999px;--shadow-xs:0 1px 2px rgba(0,0,0,.05);--shadow-sm:0 2px 4px rgba(0,0,0,.1);--shadow-md:0 4px 8px rgba(0,0,0,.15);--shadow-lg:0 8px 16px rgba(0,0,0,.2);--shadow-xl:0 12px 24px rgba(0,0,0,.25);--shadow-2xl:0 20px 40px rgba(0,0,0,.3);--shadow-inner:inset 0 2px 4px rgba(0,0,0,.1);--shadow-glow:0 0 20px var(--accent-primary);--transition-fast:150ms cubic-bezier(0.4,0,0.2,1);--transition-base:300ms cubic-bezier(0.4,0,0.2,1);--transition-slow:500ms cubic-bezier(0.4,0,0.2,1);--z-base:0;--z-dropdown:1000;--z-sticky:1020;--z-fixed:1030;--z-modal-backdrop:1040;--z-modal:1050;--z-popover:1060;--z-tooltip:1070;--max-w-xs:20rem;--max-w-sm:24rem;--max-w-md:28rem;--max-w-lg:32rem;--max-w-xl:36rem;--max-w-2xl:42rem;--max-w-3xl:48rem;--max-w-4xl:56rem;--max-w-5xl:64rem;--max-w-6xl:72rem;--max-w-7xl:80rem;--max-w-full:90rem}.card{background-color:var(--card-bg,var(--bg-secondary));border:1px solid var(--card-border,var(--border-color));border-radius:var(--radius-lg);padding:var(--space-6);box-shadow:var(--shadow-sm);transition:box-shadow var(--transition-base),transform var(--transition-base)}.card:hover{box-shadow:var(--shadow-md)}.card--elevated{box-shadow:var(--shadow-lg);border-color:transparent}.card--elevated:hover{box-shadow:var(--shadow-xl)}.card--outlined{border-width:2px;box-shadow:none;border-color:var(--accent-primary)}.card--outlined:hover{box-shadow:var(--shadow-sm)}.card--interactive{cursor:pointer;transition:all var(--transition-base)}.card--interactive:hover{transform:translateY(-2px);box-shadow:var(--shadow-xl)}.card--interactive:active{transform:translateY(0);box-shadow:var(--shadow-md)}.card--flat{box-shadow:none;border-color:transparent}.card__header{padding-bottom:var(--space-4);border-bottom:1px solid var(--card-border,var(--border-color));margin-bottom:var(--space-4)}.card__title{font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--text-primary);margin:0}.card__subtitle{font-size:var(--text-sm);color:var(--text-secondary);margin-top:var(--space-1)}.card__body{color:var(--text-secondary);line-height:var(--leading-relaxed)}.card__footer{padding-top:var(--space-4);border-top:1px solid var(--card-border,var(--border-color));margin-top:var(--space-4);display:flex;align-items:center;gap:var(--space-3)}@media (max-width:768px){.card{padding:var(--space-4);border-radius:var(--radius-md)}.card__footer,.card__header{padding-bottom:var(--space-3);padding-top:var(--space-3);margin-bottom:var(--space-3);margin-top:var(--space-3)}.card__title{font-size:var(--text-lg)}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);font-size:var(--text-base);font-weight:var(--font-semibold);line-height:var(--leading-none);border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap;user-select:none;-webkit-tap-highlight-color:transparent;font-family:inherit}.btn:focus-visible{outline:3px solid var(--accent-primary);outline-offset:2px}.btn--primary{background:var(--accent-primary);color:var(--text-on-accent,#fff);border-color:var(--accent-primary)}.btn--primary:hover{background:var(--accent-primary-hover,var(--accent-secondary));border-color:var(--accent-primary-hover,var(--accent-secondary));transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--primary:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.btn--secondary{background:var(--bg-secondary);color:var(--text-primary);border-color:var(--border-color)}.btn--secondary:hover{background:var(--bg-tertiary);border-color:var(--accent-primary)}.btn--ghost{background:transparent;color:var(--text-secondary);border-color:transparent}.btn--ghost:hover{background:var(--bg-secondary);color:var(--text-primary)}.btn--danger{background:var(--error-color,#dc2626);color:#fff;border-color:var(--error-color,#dc2626)}.btn--danger:hover{background:#b91c1c;border-color:#b91c1c;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--success{background:var(--success-color,#16a34a);color:#fff;border-color:var(--success-color,#16a34a)}.btn--success:hover{background:#15803d;border-color:#15803d;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--xs{padding:var(--space-1) var(--space-3);font-size:var(--text-xs);min-height:32px}.btn--sm{padding:var(--space-2) var(--space-4);font-size:var(--text-sm);min-height:36px}.btn--md{min-height:40px}.btn--lg{padding:var(--space-4) var(--space-8);font-size:var(--text-lg);min-height:48px}.btn--xl{padding:var(--space-5) var(--space-10);font-size:var(--text-xl);min-height:56px}.btn--disabled,.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.btn--loading{position:relative;color:transparent!important;pointer-events:none}.btn--loading:after{content:"";position:absolute;width:16px;height:16px;top:50%;left:50%;margin-left:-8px;margin-top:-8px;border:2px solid currentColor;border-radius:50%;border-right-color:transparent;animation:b .6s linear infinite;color:var(--text-on-accent,#fff)}@keyframes b{to{transform:rotate(1turn)}}.btn--block{width:100%;display:flex}.btn__icon{font-size:1.25em;line-height:1}.btn__icon--left{margin-right:var(--space-1)}.btn__icon--right{margin-left:var(--space-1)}@media 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