:root{--sfi-red: #ff3131;--sfi-dark: #06080a;--glass-bg: rgba(6, 8, 10, .75);--glass-border: rgba(255, 255, 255, .1);--glass-blur: blur(30px);--answered: #10B981;--viewed: #F43F5E;--marked: #3B82F6;--unvisited: rgba(255, 255, 255, .05);--question-scale: 1}.atmosphere{position:fixed;top:0;right:0;bottom:0;left:0;z-index:-1;background:radial-gradient(circle at 10% 20%,rgba(255,49,49,.08) 0%,transparent 40%),radial-gradient(circle at 90% 80%,rgba(168,85,247,.05) 0%,transparent 40%);filter:blur(80px)}.glass-panel{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);box-shadow:0 25px 50px -12px #00000080}.nav-panel{background:linear-gradient(180deg,#121212f7,#06080af5);backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border-bottom:1px solid rgba(255,255,255,.07);box-shadow:inset 0 1px #ffffff14,0 8px 32px #0009,0 1px #000c}.glass-button{--btn-bg: rgba(6, 8, 10, .4);background:var(--btn-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--glass-border);transition:all .3s cubic-bezier(.4,0,.2,1);font-weight:900;text-transform:uppercase;letter-spacing:.15em;display:inline-flex;align-items:center;justify-content:center}.glass-button:hover{background:#ff3131cc;transform:translateY(-2px);border-color:var(--sfi-red);color:#fff}.reveal{opacity:0;transform:translateY(30px) scale(.98);transition:all .8s cubic-bezier(.22,1,.36,1)}.reveal.active{opacity:1;transform:translateY(0) scale(1)}.stagger-1{transition-delay:.1s}.stagger-2{transition-delay:.2s}.stagger-3{transition-delay:.3s}.stagger-4{transition-delay:.4s}.text-sfi-red{color:var(--sfi-red);text-shadow:0 0 4px rgba(255,49,49,.2);filter:brightness(1.1)}.font-display{font-family:Bebas Neue,sans-serif;letter-spacing:-.01em;text-transform:uppercase}.custom-checkbox{width:20px;height:20px;border:2px solid var(--sfi-red);border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center}.custom-checkbox.checked{background:var(--sfi-red)}.custom-checkbox.checked:after{content:"✓";font-weight:700;font-size:12px}.palette-btn{aspect-ratio:1;background:#ffffff08;border:1px solid var(--glass-border);border-radius:8px;font-size:11px;font-weight:900;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.palette-btn.current{border:2px solid white;transform:scale(1.1)}.palette-btn.answered{background:var(--answered);border-color:transparent}.palette-btn.viewed{background:var(--viewed);border-color:transparent}.palette-btn.marked{background:var(--marked);border-color:transparent}.palette-btn.unvisited{opacity:.4}.option-item{background:#ffffff08;border:1px solid var(--glass-border);border-radius:12px;padding:1rem;transition:all .2s ease;display:flex;align-items:center;cursor:pointer}.option-item:hover{background:#ffffff0f}.option-item.selected{background:#ff31311a;border-color:var(--sfi-red)}.option-circle{width:28px;height:28px;border-radius:50%;border:2px solid var(--glass-border);display:flex;align-items:center;justify-content:center;font-weight:900;margin-right:1rem}.option-item.selected .option-circle{background:var(--sfi-red);color:#fff}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--sfi-dark)}::-webkit-scrollbar-thumb{background:var(--sfi-red);border-radius:10px}#mobile-menu{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--sfi-dark);z-index:100;transform:translate(100%);transition:transform .5s cubic-bezier(.16,1,.3,1);display:flex;flex-direction:column}#mobile-menu.active{transform:translate(0)}.mobile-nav-link{font-size:4rem;font-family:Bebas Neue,sans-serif;letter-spacing:.1em;opacity:0;transform:translateY(20px);transition:all .4s cubic-bezier(.16,1,.3,1)}#mobile-menu.active .mobile-nav-link{opacity:1;transform:translateY(0)}.screen{display:none!important;min-height:100vh;width:100%}.screen.active{display:flex!important}body{background-color:var(--sfi-dark);color:#fff;margin:0;overflow-x:hidden}#mock-tests-tile{scroll-margin-top:120px}@media(max-width:768px){#mock-tests-tile{scroll-margin-top:100px}}