:root{
  color-scheme: dark;
  --apk-bg:#07111f;
  --apk-card:rgba(255,255,255,.075);
  --apk-card-strong:rgba(255,255,255,.11);
  --apk-border:rgba(255,255,255,.14);
  --apk-text:#f8fafc;
  --apk-muted:rgba(226,232,240,.74);
  --apk-primary:#38bdf8;
  --apk-primary-strong:#0ea5e9;
  --apk-success:#22c55e;
  --apk-warning:#f59e0b;
  --apk-danger:#fb7185;
  --apk-shadow:0 24px 70px rgba(0,0,0,.28);
}
html[data-theme="light"]{
  color-scheme: light;
  --apk-bg:#f2f7ff;
  --apk-card:rgba(255,255,255,.88);
  --apk-card-strong:#ffffff;
  --apk-border:rgba(15,23,42,.11);
  --apk-text:#0f172a;
  --apk-muted:rgba(51,65,85,.76);
  --apk-primary:#0369a1;
  --apk-primary-strong:#075985;
  --apk-success:#15803d;
  --apk-warning:#b45309;
  --apk-danger:#be123c;
  --apk-shadow:0 22px 55px rgba(15,23,42,.12);
}
body{
  margin:0;
  background:
    radial-gradient(circle at top left, rgba(56,189,248,.2), transparent 34%),
    radial-gradient(circle at bottom right, rgba(34,197,94,.13), transparent 32%),
    var(--apk-bg);
  color:var(--apk-text);
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
.apk-page{min-height:100vh;padding:18px;box-sizing:border-box;}
.apk-shell{width:min(100%,1060px);margin:0 auto;display:grid;gap:14px;}
.apk-card{
  background:linear-gradient(145deg,var(--apk-card-strong),var(--apk-card));
  border:1px solid var(--apk-border);
  border-radius:24px;
  box-shadow:var(--apk-shadow);
  backdrop-filter:blur(18px);
  box-sizing:border-box;
}
.apk-hero{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px;}
.apk-brand{display:flex;align-items:center;gap:15px;min-width:0;}
.apk-brand-lockup{display:flex;align-items:center;justify-content:center;flex:0 0 auto;padding:8px 10px;border-radius:18px;background:rgba(255,255,255,.94);border:1px solid rgba(15,23,42,.08);box-shadow:0 14px 30px rgba(0,0,0,.12);box-sizing:border-box;}
html[data-theme="light"] .apk-brand-lockup{background:#ffffff;}
.apk-brand-logo{display:block;width:124px;height:auto;max-width:100%;object-fit:contain;}
.apk-brand-logo--large{width:min(220px,85%);}
.apk-kicker{font-size:.78rem;font-weight:900;letter-spacing:.12em;color:var(--apk-primary);text-transform:uppercase;}
.apk-hero h1{font-size:clamp(1.55rem,3.8vw,2.35rem);line-height:1.05;margin:5px 0 6px;font-weight:900;letter-spacing:-.04em;}
.apk-hero p{margin:0;color:var(--apk-muted);font-size:.84rem;line-height:1.2;font-weight:800;letter-spacing:.08em;text-transform:uppercase;}
.apk-chip{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--apk-border);border-radius:999px;padding:9px 12px;font-weight:850;font-size:.85rem;background:rgba(56,189,248,.12);white-space:nowrap;}
.apk-status{border-radius:18px;border:1px solid var(--apk-border);padding:12px 14px;font-weight:760;background:rgba(56,189,248,.1);line-height:1.4;}
.apk-status[data-state="success"]{background:rgba(34,197,94,.13);border-color:rgba(34,197,94,.28);}
.apk-status[data-state="warning"]{background:rgba(245,158,11,.14);border-color:rgba(245,158,11,.3);}
.apk-status[data-state="error"]{background:rgba(251,113,133,.15);border-color:rgba(251,113,133,.35);}
.apk-grid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:14px;align-items:stretch;}
.apk-grid-tight{grid-template-columns:minmax(0,1fr) 260px;}
.apk-grid-desktop-two{grid-template-columns:repeat(2,minmax(0,1fr));}
.apk-admin-grid{grid-template-columns:minmax(0,1fr) 360px;}
.apk-download-card,.apk-qr-card,.apk-steps-card,.apk-warning,.apk-form-card,.apk-preview-card{padding:18px;}
.apk-section-title{font-size:.78rem;font-weight:900;letter-spacing:.1em;text-transform:uppercase;color:var(--apk-primary);margin-bottom:10px;}
.apk-download-card h2,.apk-preview-card h2{font-size:1.45rem;line-height:1.15;margin:0 0 8px;font-weight:900;letter-spacing:-.025em;}
.apk-meta{color:var(--apk-muted);font-size:.92rem;font-weight:720;margin-bottom:10px;}
.apk-notes{color:var(--apk-muted);line-height:1.55;margin:8px 0 14px;white-space:pre-wrap;}
.apk-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;}
.apk-btn{appearance:none;border:0;border-radius:16px;padding:11px 14px;font-weight:900;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;line-height:1.1;transition:transform .16s ease,filter .16s ease,opacity .16s ease;}
.apk-btn:hover{transform:translateY(-1px);filter:brightness(1.05);}
.apk-btn:disabled,.apk-btn[aria-disabled="true"]{opacity:.48;cursor:not-allowed;pointer-events:none;}
.apk-btn-primary{background:linear-gradient(135deg,var(--apk-primary),var(--apk-primary-strong));color:#fff;box-shadow:0 16px 36px rgba(14,165,233,.26);}
.apk-btn-secondary{background:rgba(148,163,184,.14);color:var(--apk-text);border:1px solid var(--apk-border);}
.apk-qr-card,.apk-preview-card{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px;}
.apk-qr{width:210px;max-width:100%;aspect-ratio:1/1;border-radius:18px;background:#fff;padding:10px;border:1px solid rgba(15,23,42,.1);box-shadow:0 14px 35px rgba(0,0,0,.18);box-sizing:border-box;object-fit:contain;}
.apk-steps{margin:0;padding-left:22px;color:var(--apk-muted);line-height:1.72;font-weight:620;}
.apk-steps b{color:var(--apk-text);}
.apk-warning{font-size:.94rem;line-height:1.55;background:rgba(245,158,11,.12);border-color:rgba(245,158,11,.3);}
.apk-footer{text-align:center;color:var(--apk-muted);font-size:.82rem;padding:6px 0 12px;}
.apk-hash{margin-top:12px;border-radius:14px;padding:10px 12px;background:rgba(15,23,42,.2);font-size:.78rem;color:var(--apk-muted);word-break:break-all;}
.apk-form-card{display:grid;gap:13px;}
.apk-field{display:grid;gap:6px;text-align:left;}
.apk-field span{font-size:.83rem;font-weight:900;color:var(--apk-muted);}
.apk-field input,.apk-field textarea,.apk-field select{
  width:100%;box-sizing:border-box;border-radius:15px;border:1px solid var(--apk-border);background:rgba(15,23,42,.18);color:var(--apk-text);padding:11px 12px;font:inherit;font-weight:650;outline:none;
}
html[data-theme="light"] .apk-field input,html[data-theme="light"] .apk-field textarea,html[data-theme="light"] .apk-field select{background:#fff;}
.apk-field textarea{resize:vertical;min-height:90px;}
.apk-two-col{display:grid;grid-template-columns:150px minmax(0,1fr);gap:12px;}
.apk-debug{width:100%;max-height:230px;overflow:auto;text-align:left;white-space:pre-wrap;border-radius:14px;border:1px solid var(--apk-border);padding:10px;background:rgba(15,23,42,.22);color:var(--apk-muted);font-size:.76rem;box-sizing:border-box;}

.apk-platform-switch{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;padding:10px;}
.apk-platform-chip{display:flex;align-items:center;justify-content:center;min-height:46px;border-radius:16px;border:1px solid var(--apk-border);background:rgba(148,163,184,.10);color:var(--apk-text);font-size:.8rem;font-weight:1000;text-decoration:none;letter-spacing:.03em;}
.apk-platform-chip.is-active{background:linear-gradient(135deg,var(--apk-primary),var(--apk-primary-strong));border-color:transparent;color:#fff;box-shadow:0 14px 30px rgba(14,165,233,.18);}
.apk-step-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;}
.apk-step-tile{padding:16px 12px;display:grid;gap:6px;justify-items:center;text-align:center;min-height:94px;}
.apk-step-no{width:34px;height:34px;border-radius:999px;display:grid;place-items:center;font-size:.9rem;font-weight:1000;color:#fff;background:linear-gradient(135deg,var(--apk-primary),var(--apk-primary-strong));box-shadow:0 12px 24px rgba(14,165,233,.22);}
.apk-step-tile strong{font-size:.84rem;font-weight:1000;line-height:1.15;letter-spacing:.02em;color:var(--apk-text);}
.apk-mini-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;}
.apk-mini-steps span{min-height:54px;border-radius:16px;border:1px solid var(--apk-border);background:rgba(148,163,184,.10);display:grid;place-items:center;font-size:.82rem;font-weight:900;color:var(--apk-text);text-align:center;padding:8px;}

@media (max-width:760px){
  .apk-page{padding:10px;}
  .apk-shell{gap:10px;}
  .apk-hero{border-radius:20px;padding:14px;align-items:flex-start;flex-direction:column;}
   .apk-brand{align-items:flex-start;gap:11px;}
  .apk-brand-lockup{padding:7px 8px;border-radius:16px;}
  .apk-brand-logo{width:106px;}
  .apk-hero h1{font-size:1.45rem;}
  .apk-hero p{font-size:.76rem;}
  .apk-grid,.apk-admin-grid,.apk-grid-tight,.apk-grid-desktop-two{grid-template-columns:1fr;gap:10px;}
  .apk-download-card,.apk-qr-card,.apk-steps-card,.apk-warning,.apk-form-card,.apk-preview-card{padding:14px;border-radius:20px;}
  .apk-actions{display:grid;grid-template-columns:1fr;width:100%;}
  .apk-btn{width:100%;box-sizing:border-box;}
  .apk-two-col{grid-template-columns:1fr;}
  .apk-qr{width:190px;}
  .apk-platform-switch{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;padding:8px;}
  .apk-platform-chip{min-height:42px;border-radius:14px;font-size:.74rem;}
  .apk-step-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;}
  .apk-step-tile{min-height:82px;padding:13px 10px;border-radius:18px;}
  .apk-step-tile strong{font-size:.78rem;}
  .apk-mini-steps{grid-template-columns:1fr;gap:8px;}
}
@media print{
  body{background:#fff;color:#000;}
  .apk-page{padding:0;}
  .apk-card,.apk-status{box-shadow:none;background:#fff;border-color:#d1d5db;}
  .apk-btn{display:none;}
}

/* v2.0 Firebase direct APK download polish */
.apk-notes{margin:10px 0 0;font-size:13px;line-height:1.45;font-weight:700;color:var(--muted,#64748b)}
.apk-download-card .apk-btn[download]{font-weight:900}