.error-page-shell {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background:
                radial-gradient(circle at 18% 20%, rgba(36, 216, 255, 0.14), transparent 30%),
                radial-gradient(circle at 82% 28%, rgba(158, 240, 26, 0.14), transparent 28%),
                var(--bg);
            overflow: hidden;
        }

        .error-main {
            position: relative;
            flex: 1;
            display: flex;
            align-items: center;
            padding: 5rem 0;
        }

        .error-main .grid-overlay {
            pointer-events: none;
        }

        .error-content {
            position: relative;
            z-index: 2;
            max-width: 820px;
        }

        .error-code {
            display: inline-flex;
            align-items: center;
            gap: 0.55rem;
            margin-bottom: 1rem;
            color: var(--primary);
            font-size: 0.95rem;
            font-weight: 700;
        }

        .error-code::before {
            content: "";
            width: 0.6rem;
            height: 0.6rem;
            border-radius: 999px;
            background: var(--primary);
            box-shadow: 0 0 18px rgba(158, 240, 26, 0.7);
        }

        .error-title {
            margin: 0;
            font-size: clamp(2.2rem, 5vw, 4rem);
            line-height: 1.1;
        }

        .error-message {
            max-width: 680px;
            margin: 1.2rem 0 0;
            color: var(--text-muted);
            font-size: 1.05rem;
        }

        .error-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-top: 2rem;
        }

        @media (max-width: 720px) {
            .error-main {
                padding: 3.5rem 0;
            }
        }