.not-found{min-height:calc(100vh - var(--header-height));text-align:center;padding:var(--space-12)var(--space-6);background:var(--bg-primary);flex-direction:column;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.not-found__bg-accent{pointer-events:none;z-index:0;border-radius:50%;position:absolute}.not-found__bg-accent--1{background:radial-gradient(circle,#9448b00f 0%,#0000 70%);width:500px;height:500px;animation:12s ease-in-out infinite floatAccent;top:-120px;right:-100px}.not-found__bg-accent--2{background:radial-gradient(circle,#e47cb80d 0%,#0000 70%);width:400px;height:400px;animation:15s ease-in-out infinite reverse floatAccent;bottom:-80px;left:-80px}@keyframes floatAccent{0%,to{transform:translate(0)}50%{transform:translate(20px,-15px)}}.not-found__content{z-index:1;align-items:center;gap:var(--space-5);flex-direction:column;max-width:520px;display:flex;position:relative}.not-found__code{font-size:clamp(100px,18vw,180px);font-weight:var(--font-weight-black);background:linear-gradient(135deg,var(--color-primary-light)0%,var(--color-primary)40%,var(--color-fuchsia)70%,var(--color-accent)100%);-webkit-text-fill-color:transparent;letter-spacing:-.04em;-webkit-user-select:none;user-select:none;-webkit-background-clip:text;background-clip:text;line-height:1;animation:.8s cubic-bezier(.16,1,.3,1) both code-reveal}@keyframes code-reveal{0%{opacity:0;transform:scale(.8)translateY(20px)}to{opacity:1;transform:scale(1)translateY(0)}}.not-found__title{font-size:clamp(var(--font-size-2xl),3.5vw,var(--font-size-4xl));font-weight:var(--font-weight-bold);color:var(--color-navy);animation:.7s cubic-bezier(.16,1,.3,1) .15s both text-reveal}.not-found__description{font-size:clamp(var(--font-size-base),1.5vw,var(--font-size-lg));color:var(--text-secondary);max-width:440px;line-height:var(--line-height-relaxed);animation:.7s cubic-bezier(.16,1,.3,1) .3s both text-reveal}@keyframes text-reveal{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.not-found__actions{gap:var(--space-4);margin-top:var(--space-6);animation:.7s cubic-bezier(.16,1,.3,1) .45s both text-reveal;display:flex}.not-found__btn-home,.not-found__btn-courses{min-width:160px}@media (max-width:640px){.not-found{padding:var(--space-8)var(--space-4)}.not-found__content{gap:var(--space-4)}.not-found__actions{flex-direction:column;width:100%;max-width:280px}.not-found__btn-home,.not-found__btn-courses{justify-content:center;width:100%}.not-found__bg-accent--1{width:300px;height:300px}.not-found__bg-accent--2{width:250px;height:250px}}