:root{--bg-white:#fff;--text-black:#0a0a0a;--text-muted:#555;--text-faint:#888;--border-black:#0a0a0a;--grid-color:#0000000f;--grid-size:26px;--accent-yellow:#fef08a;--shadow-offset:4px 4px 0px #0a0a0a;--shadow-offset-hover:6px 6px 0px #0a0a0a;--font-display:"Space Grotesk", "IBM Plex Sans Thai", sans-serif;--font-body:"Plus Jakarta Sans", "IBM Plex Sans Thai", sans-serif;--font-mono:"Space Mono", monospace}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-white);min-height:100vh;color:var(--text-black);font-family:var(--font-body);background-image:linear-gradient(to right, var(--grid-color) 1px, transparent 1px), linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);background-size:var(--grid-size) var(--grid-size);text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:24px;display:flex}.error-card{border:2px solid var(--border-black);width:100%;max-width:540px;box-shadow:6px 6px 0px var(--border-black);background:#fff;padding:40px 32px;position:relative}.badge-error{font-family:var(--font-mono);border:1.5px solid var(--border-black);background:var(--accent-yellow);align-items:center;gap:6px;margin-bottom:20px;padding:4px 12px;font-size:.82rem;font-weight:700;display:inline-flex}.badge-dot{background:#ef4444;border-radius:50%;width:8px;height:8px;animation:1.5s infinite pulse;display:inline-block}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.85)}}.error-code{font-family:var(--font-display);letter-spacing:-2px;color:var(--text-black);text-shadow:3px 3px #00000014;margin-bottom:12px;font-size:clamp(4.5rem,15vw,6.5rem);font-weight:800;line-height:1}.error-title{font-family:var(--font-display);margin-bottom:12px;font-size:1.35rem;font-weight:700}.error-desc{color:var(--text-muted);margin-bottom:28px;font-size:.98rem;line-height:1.6}.error-img{filter:drop-shadow(3px 3px #00000026);max-width:140px;height:auto;margin:0 auto 24px;display:block}.btn-home{background:var(--text-black);color:#fff;font-family:var(--font-mono);border:2px solid var(--border-black);box-shadow:var(--shadow-offset);cursor:pointer;justify-content:center;align-items:center;gap:10px;padding:13px 26px;font-size:.95rem;font-weight:700;text-decoration:none;transition:all .15s;display:inline-flex}.btn-home:hover{color:var(--text-black);box-shadow:var(--shadow-offset-hover);background:#fff;transform:translate(-2px,-2px)}.btn-home:active{box-shadow:2px 2px 0px var(--border-black);transform:translate(2px,2px)}.footer-note{font-family:var(--font-mono);color:var(--text-faint);margin-top:24px;font-size:.78rem}