*{margin:0;padding:0;box-sizing:border-box}

body{
  font-family:"Segoe UI",Tahoma,Geneva,Verdana,sans-serif;
  background:linear-gradient(135deg,#0f0f1e 0%,#1a1a2e 50%,#16213e 100%);
  background-attachment:fixed;
  color:#e0e0e0;
  min-height:100vh;
  overflow-x:hidden;
}

/* --- Auth screen --- */
.auth-screen{
  position:fixed;top:0;left:0;width:100%;height:100%;
  background:linear-gradient(135deg,#0f0f1e 0%,#1a1a2e 50%,#16213e 100%);
  display:flex;align-items:center;justify-content:center;z-index:1000;
}
.auth-container{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);
  border-radius:15px;padding:40px;width:100%;max-width:500px;
  backdrop-filter:blur(20px);box-shadow:0 8px 32px rgba(0,0,0,.3);text-align:center;
}
.auth-header h1{color:#667eea;font-size:2.2em;margin-bottom:8px}
.auth-header p{color:#a0a0a0;font-size:1em}

/* --- Top nav --- */
.top-nav{
  position:sticky;top:0;z-index:500;
  display:flex;align-items:center;gap:16px;padding:0 20px;height:54px;
  background:rgba(15,15,30,.85);backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav-brand{color:#667eea;font-weight:700;font-size:1.2em;white-space:nowrap}
.nav-links{display:flex;gap:4px;flex:1;overflow-x:auto}
.nav-links a{
  padding:6px 12px;border-radius:6px;color:#a0a0a0;text-decoration:none;
  font-size:.88em;white-space:nowrap;transition:all .15s;
}
.nav-links a:hover{color:#e0e0e0;background:rgba(255,255,255,.06)}
.nav-links a.active{color:#667eea;background:rgba(102,126,234,.12)}

/* --- Hamburger --- */
.hamburger{display:none;background:none;border:none;cursor:pointer;padding:4px;z-index:600}
.hamburger span{display:block;width:24px;height:2px;background:#e0e0e0;margin:5px 0;border-radius:2px;transition:all .3s}

/* --- Main content --- */
.main-content{padding:20px;max-width:900px;margin:0 auto}
.page{display:none}
.page.active{display:block}

/* --- Cards --- */
.card{
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:12px;padding:20px;margin-bottom:16px;
}
.card h2{font-size:1.1em;margin-bottom:14px;color:#667eea}
.card-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.card-row:last-child{border-bottom:none}
.card-row .label{color:#888}
.card-row .value{font-weight:500}

/* --- Status badges --- */
.badge{display:inline-block;padding:3px 10px;border-radius:12px;font-size:.82em;font-weight:600}
.badge-active{background:rgba(76,175,80,.15);color:#4caf50}
.badge-blocked{background:rgba(244,67,54,.15);color:#f44336}
.badge-expired{background:rgba(255,152,0,.15);color:#ff9800}

/* --- Progress bar --- */
.progress-bar{height:8px;background:rgba(255,255,255,.1);border-radius:4px;overflow:hidden;margin-top:8px}
.progress-fill{height:100%;border-radius:4px;transition:width .3s}

/* --- Buttons --- */
.btn{
  padding:10px 20px;border:none;border-radius:8px;font-size:.92em;
  font-weight:500;cursor:pointer;transition:all .15s;
}
.btn-primary{background:#667eea;color:#fff}
.btn-primary:hover{background:#5a6fd6}
.btn-success{background:#4caf50;color:#fff}
.btn-success:hover{background:#43a047}
.btn-danger{background:#f44336;color:#fff}
.btn-danger:hover{background:#e53935}
.btn-secondary{background:rgba(255,255,255,.1);color:#e0e0e0}
.btn-secondary:hover{background:rgba(255,255,255,.15)}
.btn-sm{padding:6px 14px;font-size:.84em}
.btn-block{width:100%;display:block}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* --- Forms --- */
.form-group{margin-bottom:14px}
.form-group label{display:block;margin-bottom:6px;color:#a0a0a0;font-size:.9em}
.form-control{
  width:100%;padding:10px 14px;background:rgba(0,0,0,.3);
  border:1px solid rgba(255,255,255,.15);border-radius:8px;
  color:#e0e0e0;font-size:.95em;
}
.form-control:focus{outline:none;border-color:#667eea}
select.form-control{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}

/* --- Alert banner --- */
.alert{padding:14px 18px;border-radius:8px;margin-bottom:16px;font-size:.92em}
.alert-warning{background:rgba(255,152,0,.12);border:1px solid rgba(255,152,0,.25);color:#ffb74d}
.alert-danger{background:rgba(244,67,54,.12);border:1px solid rgba(244,67,54,.25);color:#ef5350}
.alert-info{background:rgba(102,126,234,.12);border:1px solid rgba(102,126,234,.25);color:#90a4ae}

/* --- QR code --- */
.qr-box{display:flex;justify-content:center;margin:16px 0}
.qr-box canvas{border-radius:8px;background:#fff;padding:8px}

/* --- Instructions --- */
.steps{display:flex;flex-direction:column;gap:12px}
.step{display:flex;gap:12px;align-items:flex-start}
.step-num{width:28px;height:28px;border-radius:50%;background:#667eea;color:#fff;display:flex;align-items:center;justify-content:center;font-size:.85em;font-weight:700;flex-shrink:0}

/* --- Grid --- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:600px){.grid-2{grid-template-columns:1fr}}

/* --- Download links --- */
.download-group{margin-bottom:20px}
.download-group h3{font-size:1em;color:#667eea;margin-bottom:10px}
.download-item{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;background:rgba(255,255,255,.04);border-radius:8px;
  margin-bottom:6px;
}
.download-item a{color:#667eea;text-decoration:none;font-weight:500}
.download-item a:hover{text-decoration:underline}

/* --- Admin --- */
.admin-section{margin-bottom:20px}
.admin-section h3{font-size:1em;color:#667eea;margin-bottom:10px}
.admin-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px}
.admin-action{
  padding:14px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:8px;cursor:pointer;text-align:center;font-size:.9em;
  transition:all .15s;
}
.admin-action:hover{background:rgba(255,255,255,.08);border-color:rgba(102,126,234,.3)}
.admin-action.active{border-color:#4caf50;background:rgba(76,175,80,.08)}
.admin-action.error{border-color:#f44336;background:rgba(244,67,54,.08)}

.client-list{display:flex;flex-direction:column;gap:6px}
.client-row{
  display:flex;align-items:center;gap:12px;padding:10px 14px;
  background:rgba(255,255,255,.04);border-radius:8px;cursor:pointer;
  transition:background .15s;
}
.client-row:hover{background:rgba(255,255,255,.08)}

/* --- Modal --- */
.modal-overlay{
  position:fixed;top:0;left:0;width:100%;height:100%;
  background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;
  z-index:900;
}
.modal-box{
  background:#1a1a2e;border:1px solid rgba(255,255,255,.1);border-radius:12px;
  padding:24px;width:100%;max-width:520px;max-height:85vh;overflow-y:auto;
}
.modal-box h2{font-size:1.15em;color:#667eea;margin-bottom:16px}
.modal-close{position:absolute;top:12px;right:16px;background:none;border:none;color:#888;font-size:1.5em;cursor:pointer}

/* --- Toast --- */
.toast-container{position:fixed;top:20px;right:20px;z-index:2000;display:flex;flex-direction:column;gap:8px}
.toast{padding:12px 20px;border-radius:8px;font-size:.9em;animation:toastIn .25s ease}
.toast-success{background:#4caf50;color:#fff}
.toast-error{background:#f44336;color:#fff}
@keyframes toastIn{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}

/* --- Helpers --- */
.text-muted{color:#888}
.text-center{text-align:center}
.mt-12{margin-top:12px}
.mb-8{margin-bottom:8px}
.mb-16{margin-bottom:16px}
.gap-8{gap:8px}
.flex{display:flex}
.flex-col{flex-direction:column}
.items-center{align-items:center}
.justify-between{justify-content:space-between}
.flex-wrap{flex-wrap:wrap}
.mono{font-family:monospace;font-size:.85em;word-break:break-all}

/* --- Responsive: ≤768px --- */
@media(max-width:768px){
  .hamburger{display:block}
  .nav-links{
    display:none;position:fixed;top:54px;left:0;right:0;
    background:rgba(15,15,30,.97);backdrop-filter:blur(12px);
    flex-direction:column;padding:12px 20px;gap:4px;
    border-bottom:1px solid rgba(255,255,255,.08);z-index:500;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:10px 12px;font-size:.95em}
  .nav-logout{margin-top:8px;width:100%}
  .main-content{padding:14px}
  .top-nav{padding:0 14px}
}

/* --- Responsive: ≤480px --- */
@media(max-width:480px){
  .auth-header h1{font-size:1.5em}
  .auth-container{padding:24px 16px;margin:0 12px}
  .modal-box{margin:0 12px;padding:18px}
  .card{padding:14px}
  .card h2{font-size:1em}
  .admin-grid{grid-template-columns:1fr 1fr;gap:8px}
  .admin-action{padding:10px;font-size:.82em}
  .client-row{padding:8px 10px;gap:8px}
  .btn{padding:8px 14px;font-size:.88em}
  .btn-sm{padding:5px 10px;font-size:.8em}
}

/* --- Responsive: ≤360px --- */
@media(max-width:360px){
  .auth-header h1{font-size:1.3em}
  .auth-container{padding:20px 14px}
  .main-content{padding:10px}
  .card{padding:12px;margin-bottom:12px}
  .card-row{flex-direction:column;gap:2px}
  .card-row .value{text-align:right}
  .admin-grid{grid-template-columns:1fr}
  .modal-box{margin:0 8px;padding:16px}
  .top-nav{height:48px;padding:0 10px}
  .nav-brand{font-size:1em}
  .hamburger span{width:20px;margin:4px 0}
  .flex.gap-8{flex-direction:column}
  .flex.gap-8 .btn{width:100%}
  .download-item{flex-direction:column;gap:6px;text-align:center}
  .toast-container{left:10px;right:10px}
  .toast{font-size:.82em;padding:10px 14px}
}