*{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0a0a0a;--card-bg:#141414;--border:#2a2a2a;--text:#fafafa;--text-muted:#888;--primary:#0f8;--secondary:#4a9eff;--error:#ff4a4a}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.container{max-width:800px;margin:0 auto;padding:2rem}.header{text-align:center;margin-bottom:2rem}.header h1{font-size:2rem;margin-bottom:.5rem}.header p{color:var(--text-muted)}.network-badge{display:inline-block;padding:.25rem .75rem;background:var(--card-bg);border:1px solid var(--border);border-radius:999px;font-size:.875rem;margin-top:.5rem}.network-badge.testnet{border-color:var(--secondary);color:var(--secondary)}.network-badge.mainnet{border-color:var(--primary);color:var(--primary)}.wallet-section{display:flex;justify-content:center;margin-bottom:2rem}.btn{padding:.75rem 1.5rem;border-radius:8px;border:none;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:#000}.btn-primary:hover{opacity:.9;transform:translateY(-1px)}.btn-secondary{background:var(--card-bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--text-muted)}.btn:disabled{opacity:.5;cursor:not-allowed}.items-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));grid-gap:1rem;gap:1rem}.item-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:1.5rem;text-align:center;transition:all .2s}.item-card:hover{border-color:var(--primary);transform:translateY(-2px)}.item-name{font-size:1.25rem;margin-bottom:.5rem}.item-price{font-size:1.5rem;color:var(--primary);margin-bottom:1rem}.item-id{font-size:.75rem;color:var(--text-muted);margin-bottom:1rem}.nickname-input{width:100%;padding:.5rem;margin-bottom:.75rem;background:var(--bg);border:1px solid var(--border);border-radius:6px;color:var(--text);font-size:.875rem}.nickname-input:focus{outline:none;border-color:var(--primary)}.status-message{text-align:center;padding:1rem;margin-top:1rem;border-radius:8px}.status-message.success{background:rgba(0,255,136,.1);border:1px solid var(--primary);color:var(--primary)}.status-message.error{background:rgba(255,74,74,.1);border:1px solid var(--error);color:var(--error)}.status-message.loading{background:rgba(74,158,255,.1);border:1px solid var(--secondary);color:var(--secondary)}.wallet-info{text-align:center;padding:1rem;background:var(--card-bg);border-radius:8px;margin-bottom:1rem}.wallet-address{font-family:monospace;color:var(--primary)}.network-switcher{display:flex;gap:.5rem;justify-content:center;margin-bottom:1rem}.network-btn{padding:.5rem 1rem;border-radius:6px;border:1px solid var(--border);background:transparent;color:var(--text-muted);cursor:pointer;transition:all .2s}.network-btn.active{border-color:var(--primary);color:var(--primary);background:rgba(0,255,136,.1)}