:root{--color-bg: #f8f7f4;--color-surface: #ffffff;--color-border: #e5e2da;--color-text: #1a1917;--color-muted: #6b6861;--color-primary: #1a1917;--color-primary-hover: #3d3a33;--color-accent: #f59e0b;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 24px;--shadow-card: 0 2px 8px rgba(0,0,0,.07), 0 0 1px rgba(0,0,0,.08);--shadow-card-hover: 0 6px 20px rgba(0,0,0,.12), 0 0 1px rgba(0,0,0,.08);--font-sans: "Inter", system-ui, -apple-system, sans-serif;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 40px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);line-height:1.5}img,video{display:block;max-width:100%}button{cursor:pointer;border:none;background:none;font:inherit}a{color:inherit;text-decoration:none}.app-layout{display:flex;min-height:100vh}.sidebar{width:220px;min-width:220px;background:var(--color-surface);border-right:1px solid var(--color-border);display:flex;flex-direction:column;padding:var(--spacing-lg);position:sticky;top:0;height:100vh;overflow-y:auto}.logo{font-size:1.5rem;font-weight:800;letter-spacing:-.04em;color:var(--color-text);margin-bottom:var(--spacing-xl)}.sidebar-nav{display:flex;flex-direction:column;gap:var(--spacing-xs);flex:1}.nav-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:10px var(--spacing-sm);border-radius:var(--radius-md);color:var(--color-muted);font-weight:500;transition:background .15s,color .15s}.nav-item:hover,.nav-item.active{background:var(--color-bg);color:var(--color-text)}.sidebar-user{padding-top:var(--spacing-md);border-top:1px solid var(--color-border);display:flex;flex-direction:column;gap:var(--spacing-sm)}.sidebar-username{font-size:.875rem;color:var(--color-muted)}.main-content{flex:1;min-width:0;overflow-y:auto;height:100vh;padding:var(--spacing-lg)}.masonry-grid{display:flex;gap:var(--spacing-md);width:100%}.masonry-column{display:flex;flex-direction:column;gap:var(--spacing-md)}.post-card{border-radius:var(--radius-lg);box-shadow:var(--shadow-card);overflow:hidden;transition:box-shadow .2s,transform .2s;border:1px solid rgba(0,0,0,.05)}.post-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.post-card.skeleton{background:linear-gradient(90deg,#f0ede8 25%,#e8e5e0,#f0ede8 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.post-card__author{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md)}.post-card__username{font-size:.875rem;font-weight:600;color:var(--color-text)}.post-card__media-wrapper{display:block;position:relative;overflow:hidden}.post-card__media{width:100%;height:auto;display:block;object-fit:cover}.post-card__multi-badge{position:absolute;top:8px;right:8px;background:#0009;color:#fff;font-size:.75rem;padding:2px 8px;border-radius:var(--radius-sm)}.post-card__caption{padding:var(--spacing-sm) var(--spacing-md);font-size:.875rem;color:var(--color-text);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.post-card__actions{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);border-top:1px solid rgba(0,0,0,.05)}.avatar{border-radius:50%;object-fit:cover;flex-shrink:0}.avatar--sm{width:28px;height:28px}.avatar--md{width:40px;height:40px}.avatar--lg{width:72px;height:72px}.avatar--fallback{background:var(--color-bg);border:1px solid var(--color-border);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.75rem;color:var(--color-muted)}.action-btn{display:flex;align-items:center;gap:4px;padding:4px 8px;border-radius:var(--radius-sm);font-size:.8125rem;color:var(--color-muted);transition:background .15s,color .15s}.action-btn:hover{background:#0000000d;color:var(--color-text)}.action-btn--active{color:var(--color-accent)}.action-btn:disabled{opacity:.5;cursor:not-allowed}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:10px 20px;border-radius:var(--radius-md);font-weight:600;font-size:.9375rem;transition:background .15s,opacity .15s;white-space:nowrap}.btn--primary{background:var(--color-text);color:#fff}.btn--primary:hover{background:var(--color-primary-hover)}.btn--primary:disabled{opacity:.5;cursor:not-allowed}.btn--ghost{background:transparent;color:var(--color-muted);border:1px solid var(--color-border)}.btn--ghost:hover{background:var(--color-bg)}.btn--sm{padding:6px 12px;font-size:.875rem}.fab{position:fixed;bottom:var(--spacing-xl);right:var(--spacing-xl);width:56px;height:56px;border-radius:50%;background:var(--color-text);color:#fff;font-size:1.75rem;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #00000040;transition:transform .15s,box-shadow .15s;z-index:40}.fab:hover{transform:scale(1.08);box-shadow:0 6px 20px #0000004d}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--spacing-lg);background:var(--color-bg)}.auth-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-xl);width:100%;max-width:400px;box-shadow:var(--shadow-card)}.auth-card--wide{max-width:540px}.auth-title{font-size:2rem;font-weight:800;letter-spacing:-.04em;margin-bottom:var(--spacing-xs)}.auth-subtitle{color:var(--color-muted);margin-bottom:var(--spacing-lg)}.auth-form{display:flex;flex-direction:column;gap:var(--spacing-md)}.auth-link{margin-top:var(--spacing-md);font-size:.875rem;color:var(--color-muted);text-align:center}.auth-link a{color:var(--color-text);font-weight:600;text-decoration:underline}.oauth-buttons{display:flex;flex-direction:column;gap:var(--spacing-sm)}.oauth-btn{width:100%;padding:10px;border-radius:var(--radius-md);border:1px solid var(--color-border);background:var(--color-surface);font-weight:600;transition:background .15s}.oauth-btn:hover{background:var(--color-bg)}.divider{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-muted);font-size:.875rem;margin:var(--spacing-sm) 0}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--color-border)}.field{display:flex;flex-direction:column;gap:4px}.field label{font-weight:600;font-size:.875rem}.field input,.field textarea,.field select{padding:10px var(--spacing-sm);border:1px solid var(--color-border);border-radius:var(--radius-md);font:inherit;background:var(--color-surface);transition:border-color .15s;width:100%}.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--color-text)}.field--row{flex-direction:row;align-items:center;justify-content:space-between}.field-error{font-size:.8125rem;color:#dc2626}.form-error{font-size:.875rem;color:#dc2626;text-align:center}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:50;padding:var(--spacing-lg)}.modal{background:var(--color-surface);border-radius:var(--radius-xl);width:100%;max-width:560px;max-height:90vh;overflow-y:auto;box-shadow:0 20px 60px #0003}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);border-bottom:1px solid var(--color-border)}.modal-header h2{font-size:1.25rem;font-weight:700}.modal-close{font-size:1.25rem;color:var(--color-muted);padding:4px;border-radius:var(--radius-sm)}.modal-close:hover{background:var(--color-bg)}.modal-actions{display:flex;gap:var(--spacing-sm);justify-content:flex-end;padding-top:var(--spacing-md)}.create-post-form{padding:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.dropzone{border:2px dashed var(--color-border);border-radius:var(--radius-lg);padding:var(--spacing-xl);text-align:center;color:var(--color-muted);cursor:pointer;transition:border-color .15s,background .15s}.dropzone--active{border-color:var(--color-text);background:var(--color-bg)}.dropzone-previews{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.dropzone-thumb{width:80px;height:80px;object-fit:cover;border-radius:var(--radius-sm)}.profile-header{margin-bottom:var(--spacing-xl)}.profile-banner{width:100%;height:200px;object-fit:cover;border-radius:var(--radius-lg)}.profile-info{padding:var(--spacing-lg) 0}.profile-display-name{font-size:1.5rem;font-weight:700}.profile-username{color:var(--color-muted)}.profile-bio{margin-top:var(--spacing-sm)}.profile-posts{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:var(--spacing-md)}@media (max-width: 768px){.sidebar{display:none}.main-content{padding:var(--spacing-md)}.fab{bottom:var(--spacing-lg);right:var(--spacing-lg)}}