*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#1d9bf0;--primary-hover:#1a8cd8;--danger:#f4212e;--danger-hover:#d01c26;--bg:#000;--bg-card:#16181c;--bg-hover:#1d1f23;--text:#e7e9ea;--text-secondary:#71767b;--border:#2f3336;--radius:8px;--max-width:600px}html{font-size:16px}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app{flex-direction:column;min-height:100vh;display:flex}.main-content{max-width:var(--max-width);flex:1;width:100%;margin:0 auto;padding:16px}.app-header{border-bottom:1px solid var(--border);background:var(--bg-card);z-index:10;position:sticky;top:0}.header-inner{max-width:var(--max-width);justify-content:space-between;align-items:center;height:53px;margin:0 auto;padding:0 16px;display:flex}.logo{color:var(--text);font-size:1.25rem;font-weight:800}.logo:hover{text-decoration:none}.header-nav{align-items:center;gap:16px;display:flex}.nav-link{color:var(--text-secondary);font-size:.9rem}.nav-link:hover{color:var(--text);text-decoration:none}.auth-page{justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.auth-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;width:100%;max-width:400px;padding:32px}.auth-title{margin-bottom:24px;font-size:1.5rem;font-weight:700}.form-group{margin-bottom:16px}.form-group label{color:var(--text-secondary);margin-bottom:4px;font-size:.875rem;display:block}.form-input{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);width:100%;color:var(--text);outline:none;padding:12px;font-size:1rem;transition:border-color .2s}.form-input:focus{border-color:var(--primary)}.auth-alt{text-align:center;color:var(--text-secondary);margin-top:16px;font-size:.875rem}.btn{cursor:pointer;border:none;border-radius:9999px;padding:8px 20px;font-size:.9rem;font-weight:600;transition:background .2s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-secondary{color:var(--text);border:1px solid var(--border);background:0 0}.btn-secondary:hover:not(:disabled){background:var(--bg-hover)}.btn-danger{color:var(--danger);border:1px solid var(--danger);background:0 0}.btn-danger:hover:not(:disabled){background:var(--danger);color:#fff}.btn-sm{padding:4px 12px;font-size:.8rem}.btn-block{border-radius:var(--radius);width:100%;padding:12px}.btn-logout{color:var(--text-secondary);border:1px solid var(--border);background:0 0;font-size:.85rem}.tweet-composer{border-bottom:1px solid var(--border);margin-bottom:8px;padding:16px 0}.composer-textarea{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);width:100%;color:var(--text);resize:none;outline:none;padding:12px;font-family:inherit;font-size:1.1rem}.composer-textarea:focus{border-color:var(--primary)}.composer-footer{justify-content:space-between;align-items:center;margin-top:8px;display:flex}.char-count{color:var(--text-secondary);font-size:.8rem}.char-count.char-limit{color:var(--danger)}.tweet-item{border-bottom:1px solid var(--border);padding:12px 0}.tweet-header{align-items:center;gap:8px;margin-bottom:4px;display:flex}.tweet-username{color:var(--text);font-size:.9rem;font-weight:600}.tweet-username:hover{text-decoration:underline}.tweet-time{color:var(--text-secondary);font-size:.8rem}.tweet-content{white-space:pre-wrap;word-wrap:break-word;font-size:.95rem;line-height:1.5}.tweet-actions{margin-top:8px}.profile-card{text-align:center;padding:16px 0}.profile-avatar{background:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;margin:0 auto 12px;font-size:1.5rem;font-weight:700;display:flex}.profile-username{font-size:1.25rem;font-weight:700}.profile-bio{color:var(--text-secondary);margin-top:4px;font-size:.9rem}.profile-stats{color:var(--text-secondary);justify-content:center;gap:24px;margin-top:12px;font-size:.9rem;display:flex}.profile-stats strong{color:var(--text)}.loading-indicator{text-align:center;color:var(--text-secondary);padding:24px}.error-msg{color:var(--danger);margin-top:8px;font-size:.85rem}.empty-state{text-align:center;color:var(--text-secondary);padding:48px 16px}.scroll-sentinel{height:1px}.not-found{text-align:center;padding:64px 16px}.not-found h1{margin-bottom:8px;font-size:3rem}.not-found p{color:var(--text-secondary);margin-bottom:24px}