*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f5f5f5}.app{max-width:520px;margin:0 auto;min-height:100vh;background:#f5f5f5;position:relative}.app-header{background:linear-gradient(135deg,#1a73e8,#0d47a1);color:#fff;padding:14px 16px;display:flex;align-items:center;gap:12px;position:sticky;top:0;z-index:100}.back-btn{background:none;border:none;color:#fff;font-size:20px;cursor:pointer;padding:4px}.header-title{font-size:18px;font-weight:600}.app-main{padding:16px;min-height:calc(100vh - 60px)}.app-main.has-tabbar{padding-bottom:70px}.tabbar{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:520px;display:flex;background:#fff;border-top:1px solid #eee;z-index:100;padding:6px 0 env(safe-area-inset-bottom,6px)}.tab-item{flex:1;text-align:center;text-decoration:none;color:#999;padding:6px 0;font-size:11px}.tab-item.active{color:#1a73e8}.tab-icon{display:block;font-size:22px;margin-bottom:2px}.tab-text{display:block}.card{background:#fff;border-radius:14px;padding:18px;margin-bottom:14px;box-shadow:0 1px 6px #0000000d}.btn-primary{width:100%;background:linear-gradient(135deg,#1a73e8,#1557b0);color:#fff;border:none;border-radius:10px;padding:12px 24px;font-size:15px;font-weight:600;cursor:pointer}.btn-primary:active{opacity:.85}.text-gray{color:#999}.empty{text-align:center;padding:40px;color:#999}