*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB',sans-serif;background:#0f0f13;color:#e0e0e0;min-height:100vh}

/* Sidebar */
.sidebar{position:fixed;top:0;left:0;width:220px;height:100vh;background:#13131b;border-right:1px solid #2a2a3a;display:flex;flex-direction:column;z-index:200;overflow-y:auto}
.sidebar-header{padding:24px 20px 20px;border-bottom:1px solid #2a2a3a}
.sidebar-header h2{font-size:1.1rem;font-weight:700;background:linear-gradient(135deg,#6366f1,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.sidebar-header p{font-size:.72rem;color:#555;margin-top:4px}
.sidebar-nav{flex:1;padding:12px 0}
.nav-item{display:flex;align-items:center;gap:12px;padding:12px 20px;color:#999;text-decoration:none;transition:background .15s,color .15s;cursor:pointer}
.nav-item:hover,.nav-item.active{background:#1e1e2e;color:#e0e0e0}
.nav-icon{width:32px;height:32px;border-radius:8px;background:#252535;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700;color:#a78bfa;flex-shrink:0}
.nav-info{flex:1;min-width:0}
.nav-name{font-size:.88rem;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav-tags{display:flex;gap:4px;margin-top:4px;flex-wrap:wrap}
.nav-tag{font-size:.62rem;padding:1px 6px;border-radius:6px;background:#252535;color:#666}

/* Hamburger button (mobile only) */
.menu-btn{display:none;position:fixed;top:12px;left:12px;z-index:300;width:40px;height:40px;border-radius:10px;background:#1a1a24;border:1px solid #2a2a3a;cursor:pointer;align-items:center;justify-content:center}
.menu-btn span{display:block;width:18px;height:2px;background:#a78bfa;border-radius:1px;position:relative}
.menu-btn span::before,.menu-btn span::after{content:'';position:absolute;left:0;width:100%;height:2px;background:#a78bfa;border-radius:1px}
.menu-btn span::before{top:-6px}
.menu-btn span::after{top:6px}

/* Overlay behind sidebar on mobile */
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:150}
.sidebar-overlay.active{display:block}

/* Main content shifted right */
.main{margin-left:220px}
.header{text-align:center;padding:60px 20px 40px}
.header h1{font-size:2.2rem;font-weight:700;background:linear-gradient(135deg,#6366f1,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:8px}
.header p{color:#888;font-size:.95rem}

/* Tabs */
.tabs{max-width:900px;margin:0 auto;padding:10px 20px 20px;display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.tab-btn{padding:12px 32px;border-radius:12px;border:2px solid #3a3a5a;background:#1e1e30;color:#ccc;font-size:1.05rem;font-weight:600;cursor:pointer;transition:background .2s,color .2s,border-color .2s,box-shadow .2s}
.tab-btn:hover{background:#2a2a45;color:#fff;border-color:#6366f1;box-shadow:0 0 12px rgba(99,102,241,.25)}
.tab-btn.active{background:linear-gradient(135deg,#6366f1,#a78bfa);color:#fff;border-color:transparent;font-size:1.1rem;box-shadow:0 4px 20px rgba(99,102,241,.4)}

.grid{max-width:900px;margin:0 auto;padding:20px 20px 60px;display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px}
.card{background:#1a1a24;border:1px solid #2a2a3a;border-radius:16px;padding:32px 28px;text-align:center;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(99,102,241,.15)}
.card-name{font-size:1.3rem;font-weight:600;margin-bottom:8px;color:#f0f0f0}
.card-desc{font-size:.88rem;color:#999;line-height:1.6;margin-bottom:20px;min-height:44px}
.card-qrcode{width:260px;height:260px;border-radius:12px;border:2px solid #2a2a3a;margin:0 auto 16px;display:block;background:#fff;padding:6px;cursor:zoom-in}
.card-tags{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:12px}
.tag{font-size:.72rem;padding:3px 10px;border-radius:10px;background:#252535;color:#a0a0b0}
.card-expires{font-size:.78rem;color:#666;margin-top:4px}
.card-expired{color:#e55}
.empty-state{text-align:center;padding:60px 20px;color:#666}
.footer{text-align:center;padding:20px;color:#444;font-size:.75rem}
.lightbox{display:none;position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:999;justify-content:center;align-items:center;cursor:zoom-out}
.lightbox.active{display:flex}
.lightbox img{max-width:90vw;max-height:90vh;border-radius:12px;background:#fff;padding:8px}

/* Mobile: hamburger menu + slide-out sidebar */
@media(max-width:768px){
  .menu-btn{display:flex}
  .sidebar{transform:translateX(-100%);transition:transform .25s ease}
  .sidebar.open{transform:translateX(0)}
  .main{margin-left:0}
}
@media(max-width:400px){.grid{grid-template-columns:1fr}.card{padding:24px 20px}}