:root{--bg-color:var(--tg-theme-bg-color,#fff);--text-color:var(--tg-theme-text-color,#000);--hint-color:var(--tg-theme-hint-color,#999);--link-color:var(--tg-theme-link-color,#2481cc);--button-color:var(--tg-theme-button-color,#2481cc);--button-text-color:var(--tg-theme-button-text-color,#fff);--secondary-bg:var(--tg-theme-secondary-bg-color,#f0f0f0);--section-bg:var(--tg-theme-section-bg-color,#fff)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app{flex-direction:column;max-width:100vw;height:100vh;display:flex;overflow:hidden}.app-content{flex:1;padding-bottom:60px;overflow-y:auto}.tab-bar{background-color:var(--section-bg);border-top:1px solid var(--secondary-bg);padding:4px 0;padding-bottom:env(safe-area-inset-bottom,4px);z-index:100;display:flex;position:fixed;bottom:0;left:0;right:0}.tab-item{color:var(--hint-color);cursor:pointer;background:0 0;border:none;flex-direction:column;flex:1;align-items:center;gap:2px;padding:6px 0;font-size:10px;transition:color .2s;display:flex}.tab-item.active{color:var(--button-color)}.tab-icon{font-size:20px}.tab-label{font-size:10px}.page{padding:16px}.page-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}h1{margin-bottom:16px;font-size:22px;font-weight:700}h2{color:var(--hint-color);margin-bottom:8px;font-size:16px;font-weight:600}.loading{text-align:center;color:var(--hint-color);padding:40px}.empty-state{text-align:center;color:var(--hint-color);padding:40px 20px}.btn{cursor:pointer;border:none;border-radius:10px;justify-content:center;align-items:center;gap:6px;padding:8px 16px;font-size:14px;font-weight:500;transition:opacity .2s;display:inline-flex}.btn:active{opacity:.7}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:var(--button-color);color:var(--button-text-color)}.btn-secondary{background-color:var(--secondary-bg);color:var(--text-color)}.btn-danger{color:#fff;background-color:#ff3b30}.btn-icon{border-radius:50%;width:32px;height:32px;padding:0;font-size:14px}.btn-block{text-align:left;width:100%;margin-bottom:8px;padding:12px 16px;display:block}.badge{background-color:var(--secondary-bg);color:var(--text-color);border-radius:6px;padding:2px 8px;font-size:11px;font-weight:600;display:inline-block}.badge-small{padding:1px 6px;font-size:10px}.chat-list{flex-direction:column;gap:8px;display:flex}.chat-item{background-color:var(--section-bg);border-radius:12px;align-items:center;gap:12px;padding:12px;display:flex}.chat-item-content{flex:1;min-width:0}.chat-item-title{white-space:nowrap;text-overflow:ellipsis;font-size:15px;font-weight:600;overflow:hidden}.chat-item-meta{align-items:center;gap:8px;margin-top:4px;display:flex}.chat-item-count{color:var(--hint-color);font-size:12px}.chat-item-preview{color:var(--hint-color);white-space:nowrap;text-overflow:ellipsis;margin-top:4px;font-size:13px;overflow:hidden}.model-list{flex-direction:column;gap:8px;display:flex}.model-card{background-color:var(--section-bg);border-radius:12px;padding:12px}.model-card-header{justify-content:space-between;align-items:center;display:flex}.model-card-name{font-size:15px;font-weight:600}.model-card-desc{color:var(--hint-color);margin-top:4px;font-size:13px}.model-card-meta{color:var(--hint-color);flex-wrap:wrap;gap:8px;margin-top:8px;font-size:12px;display:flex}.balance-card{text-align:center;background-color:var(--section-bg);border-radius:16px;margin-bottom:20px;padding:24px}.balance-amount{font-size:36px;font-weight:700}.balance-label{color:var(--hint-color);margin-top:4px;font-size:14px}.topup-section{margin-bottom:20px}.topup-grid{grid-template-columns:1fr 1fr;gap:8px;display:grid}.btn-topup{background-color:var(--section-bg);border:2px solid var(--secondary-bg);cursor:pointer;border-radius:12px;flex-direction:column;align-items:center;gap:4px;padding:16px;transition:border-color .2s;display:flex}.btn-topup:active{border-color:var(--button-color)}.topup-stars{font-size:18px;font-weight:600}.topup-usd{color:var(--hint-color);font-size:13px}.transactions-section{margin-top:20px}.transaction-list{flex-direction:column;gap:4px;display:flex}.transaction-item{background-color:var(--section-bg);border-radius:8px;justify-content:space-between;align-items:center;padding:10px 12px;display:flex}.transaction-info{align-items:center;gap:8px;display:flex}.transaction-type{border-radius:50%;justify-content:center;align-items:center;width:24px;height:24px;font-size:12px;display:flex}.transaction-type.topup{color:#fff;background-color:#34c759}.transaction-type.usage{color:#fff;background-color:#ff3b30}.transaction-desc{font-size:13px}.transaction-amount{font-size:14px;font-weight:600}.transaction-amount.positive{color:#34c759}.transaction-amount.negative{color:#ff3b30}.settings-section{margin-bottom:24px}.settings-row{gap:8px;display:flex}.model-select-list{flex-direction:column;gap:4px;display:flex}