:root{
  --bg:#f4f8ff;
  --bg2:#eef7ff;
  --card:#ffffff;
  --text:#122033;
  --muted:#708198;
  --line:#e8eef7;
  --blue:#2979ff;
  --blue2:#57a5ff;
  --green:#22c55e;
  --danger:#ef4444;
  --shadow:0 10px 30px rgba(28,63,122,.10);
  --radius:24px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:linear-gradient(180deg,var(--bg),var(--bg2));color:var(--text);min-height:100%}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
button,input,select,textarea{font:inherit}
body.mobile-app{padding-bottom:90px}
.container{max-width:1100px;margin:0 auto;padding:16px}
.phone-shell{max-width:520px;margin:0 auto;min-height:100vh;position:relative}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 0 18px 0}
.brand{font-weight:800;font-size:20px;letter-spacing:.2px}
.brand small{display:block;font-size:12px;color:var(--muted);font-weight:600}
.card{background:var(--card);border:1px solid rgba(255,255,255,.75);box-shadow:var(--shadow);border-radius:var(--radius);padding:18px}
.glass{background:rgba(255,255,255,.8);backdrop-filter:blur(10px)}
.hero{background:linear-gradient(135deg,#2879ff,#60b4ff);color:#fff;border-radius:30px;padding:22px;box-shadow:0 18px 36px rgba(41,121,255,.22);overflow:hidden;position:relative}
.hero:after{content:"";position:absolute;right:-60px;top:-60px;width:180px;height:180px;background:rgba(255,255,255,.14);border-radius:50%}
.hero h1,.hero h2,.hero h3{margin:0 0 6px 0}
.hero p{margin:0;color:rgba(255,255,255,.88)}
.section-title{font-size:14px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);font-weight:800;margin:22px 0 12px}
.grid{display:grid;gap:14px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.stat{padding:16px;border-radius:22px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.stat .num{font-size:28px;font-weight:800;margin-top:6px}
.label{font-size:12px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.input-group{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.input-group label{font-size:13px;font-weight:700;color:#2a3d56}
.input,select,textarea{width:100%;background:#f8fbff;border:1px solid #dde8f6;border-radius:16px;padding:14px 14px;outline:none;transition:.25s}
.input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(41,121,255,.10)}
.btn{appearance:none;border:none;border-radius:18px;padding:14px 16px;font-weight:800;cursor:pointer;transition:transform .15s ease, box-shadow .25s ease, opacity .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px}
.btn:active{transform:scale(.98)}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;box-shadow:0 10px 22px rgba(41,121,255,.24)}
.btn-success{background:linear-gradient(135deg,#16a34a,#4ade80);color:#fff;box-shadow:0 10px 22px rgba(34,197,94,.24)}
.btn-light{background:#fff;color:var(--text);border:1px solid var(--line)}
.btn-danger{background:linear-gradient(135deg,#ef4444,#fb7185);color:#fff}
.btn.full{width:100%}
.pill{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:8px 12px;font-weight:700;font-size:12px;background:#edf7ff;color:#175eb8}
.status{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:8px 12px;font-weight:800;font-size:12px}
.status.valid{background:#e9fff0;color:#12803a}
.status.invalid{background:#fff1f2;color:#b42318}
.status.expired{background:#fff8e8;color:#a15b00}
.bottom-nav{position:fixed;bottom:14px;left:50%;transform:translateX(-50%);width:min(520px,calc(100% - 28px));background:rgba(255,255,255,.88);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.9);box-shadow:0 14px 35px rgba(23,49,95,.14);border-radius:22px;padding:10px;display:flex;gap:8px;z-index:50}
.bottom-nav a{flex:1;text-align:center;padding:10px 8px;border-radius:16px;color:var(--muted);font-size:12px;font-weight:800}
.bottom-nav a.active{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;box-shadow:0 8px 18px rgba(41,121,255,.22)}
.list{display:flex;flex-direction:column;gap:10px}
.list-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px;border:1px solid var(--line);border-radius:18px;background:#fff}
.table{width:100%;border-collapse:separate;border-spacing:0 10px}
.table th{font-size:12px;color:var(--muted);text-align:left;padding:0 12px}
.table td{background:#fff;padding:14px 12px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.table td:first-child{border-left:1px solid var(--line);border-radius:16px 0 0 16px}
.table td:last-child{border-right:1px solid var(--line);border-radius:0 16px 16px 0}
.badge{padding:6px 10px;border-radius:999px;background:#eff6ff;color:#174ea6;font-size:12px;font-weight:700;display:inline-block}
.muted{color:var(--muted)}
.row{display:flex;gap:10px;flex-wrap:wrap}.row>*{flex:1}
.hidden{display:none!important}
.center{text-align:center}.right{text-align:right}
.small{font-size:12px}.tiny{font-size:11px}
.kv{display:grid;grid-template-columns:120px 1fr;gap:8px 14px;font-size:14px}
.shimmer{position:relative;overflow:hidden;background:#f1f5f9;min-height:86px;border-radius:20px}
.shimmer:before{content:"";position:absolute;inset:0;transform:translateX(-100%);background:linear-gradient(90deg,transparent,rgba(255,255,255,.7),transparent);animation:shimmer 1.25s infinite}
.fade-in{animation:fade .4s ease both}.slide-up{animation:slideUp .4s ease both}
.success-pop{animation:successPop .55s ease both}
.toast{position:fixed;top:14px;left:50%;transform:translateX(-50%);background:#111827;color:#fff;padding:12px 16px;border-radius:14px;box-shadow:var(--shadow);z-index:100;opacity:0;pointer-events:none;transition:.25s}
.toast.show{opacity:1}
.certificate-preview{background:#fff;border-radius:24px;box-shadow:var(--shadow);border:1px solid var(--line);padding:14px;overflow:hidden}
.certificate-canvas{width:100%;aspect-ratio:1.414/1;background:linear-gradient(135deg,#fff,#f7fbff);position:relative;border:10px solid #dfeeff;border-radius:18px;padding:6.5%}
.cert-inner{position:relative;width:100%;height:100%;border:2px solid #8ab8ff;border-radius:16px;padding:5.5%;overflow:hidden}
.cert-watermark{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:64px;font-weight:900;color:rgba(41,121,255,.06);transform:rotate(-18deg);pointer-events:none}
.cert-title{font-size:34px;text-align:center;font-weight:900;color:#1d4ed8;letter-spacing:.04em}
.cert-sub{text-align:center;font-size:16px;color:#40536a;margin-top:6px}
.cert-name{text-align:center;font-size:32px;font-weight:900;margin:22px 0 8px;color:#0f172a;text-transform:uppercase}
.cert-program{text-align:center;font-size:18px;line-height:1.5;color:#24364c}
.cert-meta{display:flex;justify-content:space-between;gap:16px;align-items:flex-end;margin-top:28px}
.cert-sign{width:180px;text-align:center}
.sign-box{height:70px;display:flex;align-items:flex-end;justify-content:center;border-bottom:2px solid #93c5fd;margin-bottom:8px;padding-bottom:6px}
.qr-box{width:118px;height:118px;border:1px solid #cfe0f7;border-radius:12px;padding:6px;background:#fff}
.empty-state{padding:20px;text-align:center;color:var(--muted)}
.login-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.fab{position:absolute;right:18px;bottom:96px;width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;box-shadow:0 12px 28px rgba(41,121,255,.26);font-size:28px;border:none}
.modal{position:fixed;inset:0;background:rgba(8,15,31,.45);display:none;align-items:flex-end;justify-content:center;z-index:90;padding:0}
.modal.show{display:flex}.sheet{width:min(520px,100%);background:#fff;border-radius:28px 28px 0 0;padding:18px 18px 26px;max-height:92vh;overflow:auto;animation:slideUp .3s ease both}
.hr{height:1px;background:var(--line);margin:14px 0}
.upload-box{border:2px dashed #bfdbfe;background:#f8fbff;border-radius:18px;padding:18px;text-align:center;color:var(--muted)}
.header-row{display:flex;justify-content:space-between;align-items:center;gap:12px}
@keyframes shimmer{100%{transform:translateX(100%)}}
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
@keyframes successPop{0%{transform:scale(.9);opacity:0}60%{transform:scale(1.03);opacity:1}100%{transform:scale(1);opacity:1}}
@media (min-width:768px){
  .phone-shell{max-width:1120px}
  .desktop-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
  .modal{align-items:center;padding:16px}.sheet{border-radius:28px;max-width:620px}
}
@media print{
  body{background:#fff;padding:0!important}
  .no-print,.bottom-nav,.topbar,.fab,.toast,.section-title,.admin-tools,.header-row button{display:none!important}
  .container,.phone-shell{max-width:none;padding:0;margin:0}
  .card,.certificate-preview{box-shadow:none;border:none;border-radius:0;padding:0}
  .certificate-canvas{border:none;border-radius:0;aspect-ratio:auto;height:100vh;page-break-after:always}
}