/* ═══════════════════════════════════════════════════════════════════════════════ SIS Portal — Advertisement System (v2 — Splash Screen) Desktop : centered popup overlay, X close button, optional auto-close Mobile : FULLSCREEN SPLASH SCREEN — covers 100 % viewport, no close button, auto-close with countdown timer bar, object-fit:cover ═══════════════════════════════════════════════════════════════════════════════ */ /* ── Early-blocking: mobile content stays invisible until ad finishes ── .sis-ad-block is added by an inline