*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}body{font-family:'Hind Siliguri',sans-serif;background:var(--bg-light);color:var(--text-dark);min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden}.error-hero{flex:1;display:flex;align-items:center;justify-content:center;padding:60px 0 40px;position:relative;overflow:hidden}.error-hero::before{content:'';position:absolute;top:-80px;left:-80px;width:380px;height:380px;background:radial-gradient(circle,color-mix(in srgb,var(--primary) 13%,transparent) 0%,transparent 70%);border-radius:50%;pointer-events:none}.error-hero::after{content:'';position:absolute;bottom:-60px;right:-60px;width:300px;height:300px;background:radial-gradient(circle,rgba(34,197,94,0.10) 0%,transparent 70%);border-radius:50%;pointer-events:none}.error-card{background:var(--text-light);border-radius:28px;box-shadow:0 8px 50px color-mix(in srgb,var(--primary) 14%,transparent),0 2px 12px rgba(0,0,0,0.06);border:1.5px solid var(--border-color);padding:52px 44px 44px;text-align:center;max-width:620px;width:100%;position:relative;z-index:2}.error-number{font-size:clamp(5rem,18vw,9rem);font-weight:800;line-height:1;background:linear-gradient(135deg,var(--primary-deeper),var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px;letter-spacing:-4px;position:relative;animation:pulse404 3s ease-in-out infinite}@keyframes pulse404{0%,100%{opacity:1;transform:scale(1)}50%{opacity:0.85;transform:scale(1.03)}}.error-wave-icon{font-size:3rem;margin-bottom:14px;display:block;animation:bobFloat 2.5s ease-in-out infinite}@keyframes bobFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}.error-title{font-size:1.55rem;font-weight:800;color:var(--text-dark);margin-bottom:12px}.error-subtitle{font-size:1rem;color:var(--text-muted);line-height:1.7;margin-bottom:28px}.btn-home{display:inline-flex;align-items:center;gap:9px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:var(--text-light);font-weight:700;font-size:1rem;padding:14px 32px;border-radius:50px;text-decoration:none;border:none;box-shadow:0 4px 18px color-mix(in srgb,var(--primary) 35%,transparent);transition:all 0.25s;margin-bottom:14px}.btn-home:hover{color:var(--text-light);transform:translateY(-2px);box-shadow:0 8px 28px color-mix(in srgb,var(--primary) 45%,transparent);background:linear-gradient(135deg,var(--primary-dark),var(--primary-deeper))}.btn-register-alt{display:inline-flex;align-items:center;gap:9px;background:linear-gradient(135deg,var(--secondary),var(--secondary-dark));color:var(--text-light);font-weight:700;font-size:1rem;padding:14px 32px;border-radius:50px;text-decoration:none;border:none;box-shadow:0 4px 18px rgba(34,197,94,0.3);transition:all 0.25s;margin-bottom:14px;margin-left:10px}.btn-register-alt:hover{color:var(--text-light);transform:translateY(-2px);box-shadow:0 8px 28px rgba(34,197,94,0.4)}.error-divider{border:none;border-top:1.5px dashed var(--border-color);margin:28px 0 24px}.quick-links-title{font-size:0.92rem;font-weight:700;color:var(--text-muted);margin-bottom:14px;letter-spacing:0.5px}.quick-link-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.quick-link-item{display:flex;align-items:center;gap:8px;background:var(--bg-card);border:1.5px solid var(--border-color);border-radius:12px;padding:10px 14px;text-decoration:none;color:var(--text-dark);font-size:0.85rem;font-weight:600;transition:all 0.2s}.quick-link-item:hover{background:var(--primary);border-color:var(--primary);color:var(--text-light);transform:translateY(-2px);box-shadow:0 4px 14px color-mix(in srgb,var(--primary) 25%,transparent)}.quick-link-item i{font-size:1rem;color:var(--primary);flex-shrink:0;transition:color 0.2s}.quick-link-item:hover i{color:var(--text-light)}.wave-bar{width:100%;height:6px;border-radius:50px;background:linear-gradient(90deg,var(--primary-deeper),var(--primary),var(--secondary),var(--primary));background-size:200%;animation:waveMove 3s linear infinite;margin-bottom:24px}@keyframes waveMove{0%{background-position:0%}100%{background-position:200%}}.redirect-notice{font-size:0.82rem;color:var(--text-muted);margin-top:18px}.redirect-notice span{font-weight:800;color:var(--primary-dark)}@media (max-width:575px){.error-card{padding:36px 20px 30px;border-radius:20px}.quick-link-grid{grid-template-columns:1fr 1fr;gap:8px}.btn-home,.btn-register-alt{font-size:0.9rem;padding:12px 22px}.btn-register-alt{margin-left:0}}