:root{
    --bg: #0b0f14;
    --card: #111826;
    --card2: #0f1623;
    --text: #e8eef7;
    --muted: #9aa7b8;
    --accent: #ffcc00;
    --accent2: #ff9f1a;
    --danger: #ff4d4d;
    --ok: #3ddc97;
  
    --r: 18px;
    --shadow: 0 10px 30px rgba(0,0,0,.35);
    --stroke: 1px solid rgba(255,255,255,.08);
  }
  
  *{ box-sizing: border-box; }
  html,body{ height:100%; }
  body{
    margin:0;
    background: radial-gradient(1200px 800px at 20% -10%, rgba(255,204,0,.12), transparent 55%),
                radial-gradient(1000px 700px at 90% 20%, rgba(255,159,26,.10), transparent 55%),
                var(--bg);
    color: var(--text);
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  }
  
  .app{
    max-width: 480px;
    margin: 0 auto;
    padding: 14px 14px 92px;
  }
  
  .card{
    background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.01));
    border: var(--stroke);
    border-radius: var(--r);
    box-shadow: var(--shadow);
  }
  
  .topbar{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding: 8px 2px 12px;
  }
  
  .brand{
    display:flex;
    align-items:center;
    gap:10px;
  }
  .logo{
    width:38px;height:38px;
    display:grid; place-items:center;
    border-radius: 12px;
    background: rgba(255,204,0,.14);
    border: 1px solid rgba(255,204,0,.18);
  }
  .title{ font-weight:800; letter-spacing:.2px; }
  .subtitle{ color: var(--muted); font-size: 12px; margin-top:2px; }
  
  .icon-btn{
    background: rgba(255,255,255,.04);
    color: var(--text);
    border: var(--stroke);
    border-radius: 14px;
    height: 38px;
    width: 44px;
    display:grid; place-items:center;
    cursor:pointer;
  }
  .icon-btn:active{ transform: scale(.98); }
  
  .balance{
    padding: 14px;
  }
  .balance-row{
    display:flex;
    justify-content:space-between;
    align-items:flex-end;
    gap:12px;
  }
  .label{ color: var(--muted); font-size: 12px; }
  .value{
    font-size: 34px;
    font-weight: 900;
    letter-spacing: .3px;
    margin-top:4px;
  }
  .value-sm{
    font-size: 18px;
    font-weight: 800;
    margin-top:4px;
    color: rgba(255,204,0,.95);
  }
  .hint{
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed rgba(255,255,255,.10);
    color: rgba(232,238,247,.85);
    font-size: 13px;
  }
  
  .action{
    margin-top: 12px;
  }
  
  .click-btn{
    width:100%;
    padding: 16px 14px;
    border-radius: 22px;
    border: 1px solid rgba(255,204,0,.22);
    background: linear-gradient(180deg, rgba(255,204,0,.20), rgba(255,159,26,.12));
    color: var(--text);
    box-shadow: 0 14px 40px rgba(255,204,0,.10);
    cursor:pointer;
    user-select:none;
  }
  .click-btn-title{
    font-weight: 900;
    font-size: 20px;
  }
  .click-btn-sub{
    margin-top: 6px;
    color: rgba(232,238,247,.85);
    font-size: 13px;
  }
  .click-btn:active{ transform: scale(.985); }
  
  .micro-row{
    display:flex;
    gap:10px;
    margin-top: 10px;
  }
  .pill{
    flex:1;
    padding: 10px 12px;
    border-radius: 16px;
    border: var(--stroke);
    background: rgba(255,255,255,.03);
    color: rgba(232,238,247,.85);
    font-size: 12px;
  }
  
  .upgrades{
    margin-top: 14px;
  }
  .section-head{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    margin: 8px 2px 10px;
  }
  .section-title{
    font-weight: 900;
    letter-spacing:.2px;
  }
  .text-btn{
    background: transparent;
    border: none;
    color: rgba(255,204,0,.95);
    font-weight: 700;
    cursor:pointer;
  }
  
  .upgrade-list{
    display:flex;
    flex-direction:column;
    gap:10px;
  }
  
  .upgrade-card{
    padding: 12px;
    border-radius: var(--r);
    background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,.015));
    border: var(--stroke);
  }
  .upgrade-top{
    display:flex;
    justify-content:space-between;
    gap:10px;
    align-items:flex-start;
  }
  .upgrade-name{
    font-weight: 900;
  }
  .upgrade-desc{
    margin-top: 4px;
    color: rgba(232,238,247,.80);
    font-size: 12px;
  }
  .badge{
    font-size: 12px;
    padding: 6px 10px;
    border-radius: 999px;
    border: 1px solid rgba(255,204,0,.18);
    background: rgba(255,204,0,.10);
    color: rgba(255,204,0,.95);
    white-space: nowrap;
  }
  .upgrade-bottom{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    margin-top: 12px;
  }
  .effect{
    color: rgba(232,238,247,.85);
    font-size: 12px;
  }
  .buy-btn{
    padding: 10px 12px;
    border-radius: 14px;
    border: 1px solid rgba(255,204,0,.22);
    background: rgba(255,204,0,.14);
    color: var(--text);
    font-weight: 900;
    cursor:pointer;
  }
  .buy-btn:active{ transform: scale(.98); }
  .buy-btn[disabled]{
    opacity:.45;
    cursor:not-allowed;
    border-color: rgba(255,255,255,.10);
    background: rgba(255,255,255,.04);
  }
  
  .bottom-nav{
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    bottom: 10px;
    width: min(480px, calc(100% - 20px));
    display:flex;
    gap:10px;
    padding: 10px;
    border-radius: 22px;
    border: var(--stroke);
    background: rgba(17,24,38,.72);
    backdrop-filter: blur(10px);
  }
  .nav-item{
    flex:1;
    border: none;
    background: transparent;
    color: rgba(232,238,247,.78);
    padding: 10px 8px;
    border-radius: 16px;
    cursor:pointer;
    display:flex;
    gap:6px;
    align-items:center;
    justify-content:center;
    font-weight: 800;
  }
  .nav-item span{ font-size: 12px; }
  .nav-item.active{
    color: var(--text);
    background: rgba(255,204,0,.12);
    border: 1px solid rgba(255,204,0,.18);
  }
  
  .toast{
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    bottom: 86px;
    background: rgba(0,0,0,.75);
    border: 1px solid rgba(255,255,255,.12);
    color: var(--text);
    padding: 10px 12px;
    border-radius: 14px;
    font-size: 13px;
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s ease;
    max-width: min(480px, calc(100% - 20px));
  }
  .toast.show{ opacity: 1; }