*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #037dd6;--primary-hover: #0260a4;--secondary-color: #f7f9fa;--text-primary: #24272a;--text-secondary: #6a737d;--border-color: #d0d7de;--success-color: #28a745;--error-color: #dc3545;--warning-color: #ffc107;--background: #ffffff;--card-background: #f8f9fa;--shadow: 0 2px 8px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .15)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--text-primary)}.app{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.container{max-width:420px;width:100%;background:var(--background);border-radius:12px;box-shadow:var(--shadow-lg);overflow:hidden}.page-container{padding:32px 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0}.network-selector{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}.network-btn{flex:1;min-width:100px;padding:10px 16px;border:1px solid var(--border-color);border-radius:6px;background:var(--background);font-size:13px;font-weight:500;cursor:pointer;transition:all .2s}.network-btn.active{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.network-btn:hover{background:var(--secondary-color)}.network-btn.active:hover{background:var(--primary-hover)}.tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--border-color)}.tab{padding:12px 20px;border:none;background:none;font-size:14px;font-weight:500;color:var(--text-secondary);cursor:pointer;border-bottom:2px solid transparent;transition:all .2s}.tab.active{color:var(--primary-color);border-bottom-color:var(--primary-color)}.tab:hover{color:var(--text-primary)}.alert{padding:12px 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.2s}.icon-btn:hover{background:var(--secondary-color);color:var(--text-primary)}.loading{display:inline-block;width:16px;height:16px;border:2px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.fade-in{animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.account-menu{position:absolute;top:100%;left:0;right:0;margin-top:8px;background:#fff;border-radius:8px;box-shadow:var(--shadow-lg);border:1px solid var(--border-color);z-index:1000;max-height:300px;overflow-y:auto}.account-menu-item{padding:12px 16px;cursor:pointer;border-bottom:1px solid var(--border-color);transition:background .2s}.account-menu-item:hover,.account-menu-item.active{background:var(--secondary-color)}